STANDBY MODE OF AN ELEVATOR
Field of the invention
The object of the invention is an elevator system as defined in the preamble of
claim 1 and a method as defined in the preamble of claim 8.
Prior art
The electricity supply during the standby mode of an elevator system is
conventionally disconnected centrally at the control panel of the elevator, e.g.
by extinguishing the power source of the elevator control electronics. The aim of
disconnecting the electricity supply is to reduce the power losses of the elevator
system.
Publication JP2005162441 presents a power source of elevator control
electronics, which can be extinguished in a controlled manner by means of a
special extinguishing circuit.
Publication JP2003054846 presents an arrangement for the standby mode of
an elevator, in which the control panel of the elevator comprises means for
disconnecting the power supply of the cards of the landing door.
Publication JP2005212921 presents an elevator control arrangement, which
comprises a switch for disconnecting the power supply both from the control _
electronics as well as from the main circuit of the power supply appliance of the
motor.
Purpose of the invention
The purpose of the invention is to disclose a standby mode arrangement of an
elevator, which arrangement is more versatile than prior art and by means of
which one or more control appliances of the elevator can be controlled to
standby mode or to terminate the set standby mode either simultaneously or in
stages. In this case the standby mode can be determined more diversely than in
prior art by means of different activation signals, and on the basis of the
determination it is also possible to select the appliances to control into standby
mode as well as the duration of the standby mode. The time of recovery from
standby mode can in this case vary according to the requirements of the control
situation of the elevator.
Characteristic features of the invention
The elevator system according to the invention is characterized by what is
disclosed in the characterization part of claim 1. The method according to the
invention for fitting a standby mode into an elevator is characterized by what is
disclosed in the characterization part of claim 8. Other features of the invention
are characterized by what is disclosed in the other claims. Some inventive
embodiments are also discussed in the descriptive section of the present
application. The inventive content of the application can also be defined
differently than in the claims presented below. The inventive content may also
consist of several separate inventions, especially if the invention is considered
in the light of expressions or implicit sub-tasks or from the point of view of
advantages or categories of advantages achieved. In this case, some of the
attributes contained in the claims below may be superfluous from the point of
view of separate inventive concepts.
The elevator system according to the invention comprises control appliances of
the elevator system that are fitted to communicate between themselves. The
elevator system comprises a control arrangement for placing at least one
control appliance of the elevator system into standby mode or for terminating
the standby mode. The aforementioned control arrangement is fitted to set a
standby mode on the basis of at least one activation signal, and the control
arrangement is fitted to sent a control signal of the standby mode to at least one
control appliance of the elevator system, which control appliance of the elevator
system comprises a first and a second power supply circuit. A controllable
switch is connected to the aforementioned second power supply circuit such
that power supply from the output of the second power supply circuit can be
either allowed or prevented with the control of the switch.
A controller is connected to the aforementioned first power supply circuit, which
controller comprises an input for the control signal of the standby mode, and the
aforementioned controller is fitted to control the aforementioned switch on the
basis of the control signal of the standby mode.
In one embodiment of the invention the control signal of the standby mode
comprises individualized data of the control appliance of the elevator system to
be controlled into the standby mode, and the control information contained in
the control signal can in this case possibly also vary depending on what control
appliance of the elevator system the control signal of the standby mode applies
to.
One elevator system according to the invention comprises at least one of the
following control appliances: a traffic control appliance, a movement control
appliance, a power control appliance of the elevator motor, a control appliance
of the lighting of the elevator, a control appliance of the landing calls, a control
appliance of the elevator car, a brake control appliance of the elevator and also
a control appliance of the safety arrangement of the elevator.
In one arrangement according to the invention at least one of the following
functions as an activation signal: a landing call signal, a status signal of the
control appliance of the safety arrangement of the elevator, a movement signal
of the elevator car, a status signal of the power supply of the elevator, a signal
of the sensor of the stopping floor of the elevator.
In one elevator system according to the invention at least one control appliance
of the elevator system is fitted to switch to standby mode after the elevator car
has stopped at the stopping floor of the elevator.
In one elevator system according to the invention at least one control appliance
of the elevator system comprises a first and a second power supply circuit. In
this case a controllable switch is connected to the second power supply circuit
such that power supply from the output of the second power supply circuit can
be either allowed or prevented with the control of the switch. In this embodiment
of the invention a controller is connected to the first power supply circuit, which
controller comprises an input for the control signal of the standby mode as well
as an output for the control signal of the aforementioned controllable switch,
and the aforementioned controller is fitted to control the aforementioned switch
on the basis of the control signal of the standby mode. The aforementioned
controlled switch can be a mechanical switch, such as a relay or contactor, or
the switch can also be a semiconductor, such as an IGBT transistor, a MOSFET
transistor, or a thyristor.
In one elevator system according to the invention the power supply circuit of the
sensor that measures the movement of the elevator car is in the output of the
second brake power supply circuit, and in the standby mode of the control
appliance of the elevator the aforementioned controllable switch is periodically
controlled to the state of permitted power supply for reading the sensor that
measures the movement of the elevator car one preset interval at a time.
In one elevator system according to the invention the power supply to the brake
of the elevator is fitted to occur with the control of the brake control appliance of
the elevator via the power supply circuit of the safety devices of the elevator.
The aforementioned controllable switch is in this case fitted to the power supply
circuit of the brake of the elevator such that power supply to the opener of the
brake can be either allowed or prevented with the control of the switch, and in
the standby mode of the brake control appliance the aforementioned switch is
periodically controlled to the state of permitted power supply of the elevator for
testing the brake of the elevator one preset interval at a time. The
aforementioned brake opener can be e.g. a coil of the magnetic circuit of the
brake.
One control appliance of the safety arrangement of an elevator according to the
invention comprises the safety devices of the elevator, such as the control of
the power supply of the sensors measuring the safety of the elevator. In one
elevator system according to the invention the control appliance of the safety
arrangement of the elevator is fitted it in its standby mode to periodically supply
power to at least one sensor that measures the safety of the elevator for
reading the aforementioned sensor one preset measurement interval at a time.
The control appliance of the safety arrangement of the elevator can be
implemented with electronic circuits, such as with one or two microcontrollers
that monitor each other, or the control appliance can also be implemented with
e.g. relays.
In one elevator system according to the invention the lighting of the elevator is
controlled on the basis of a control signal of the standby mode received by the
control appliance of the lighting of the elevator.
The standby mode of the control appliance of one elevator system according to
the invention is divided between a first and a second standby mode. The
aforementioned control appliance is in this case fitted to switch to a first standby
mode with a first delay after receiving the control signal of the standby mode.
After switching to the first standby mode the aforementioned control appliance
is fitted to further switch after a preset second time delay to a second standby
mode. In the second standby mode the functions of the control appliance are
further extinguished, and recovery from the second standby mode is in this case
slower than recovery from the first standby mode. For example, the power
control appliance of the elevator motor, such as a frequency converter, can be
fitted to extinguish its control electronics, such as the control electronics of the
power semiconductors, in the first standby mode, and the frequency converter
can in this case be fitted to further extinguish its DC intermediate circuit in the
second standby mode, in which case recovery from the second standby mode
requires recharging of the capacitors of the DC intermediate circuit.
In the method according to the invention for fitting a standby mode into an
elevator system, control appliances that communicate between themselves are
fitted into the elevator system, and at least one aforementioned control
appliance of the elevator system is controlled into standby mode or the standby
mode of at least one control appliance of the elevator system is terminated. In
the method the standby mode of the elevator is set on the basis of at least one
activation signal; a control signal of the standby mode is sent to at least one
control appliance of the elevator system; a first and a second power supply
circuit are fitted to the control appliance of the elevator system; a controllable
switch is connected to the second power supply circuit such that power supply
from the output of the second power supply circuit can be either allowed or
prevented with the control of the switch; a controller is fitted to the first power
supply circuit; and also an input for the control signal of the standby mode is
fitted in connection with the controller; and the control signal of the standby
mode is read and the switch is controlled with the controller on the basis of the
control signal of the standby mode.
In one method according to the invention the control signal of the standby mode
is sent to at least one control appliance of the elevator system.
In one method according to the invention a first and a second power supply
circuit are fitted to a control appliance of the elevator system; a controllable
switch is connected to the second power supply circuit such that power supply
from the output of the second power supply circuit can be either allowed or
prevented with the control of the switch; a controller is fitted to the first power
supply circuit; and also an input for the control signal of the standby mode and
an output for the control signal of the switch is fitted in connection with the
controller; and the control signal of the standby mode is read with the switch
and also the switch is controlled on the basis of the control signal of the standby
mode.
In one method according to the invention the power supply of the sensor that
measures movement of the elevator car is fitted to the output of the second
power supply circuit; the control signal of the standby mode is read, and the
controller is switched to standby mode according to the control signal read; in
the standby mode the switch is periodically controlled to the mode permitting
power supply for at least one preset interval at a time; and also the sensor that
measures movement of the elevator car is read during the permitted power
supply mode of the switch.
One determination of the standby mode according to the invention on the basis
of at least one activation signal is integrated into a control appliance of the
elevator system.
In one embodiment of the invention at least two control appliances of the
elevator system are integrated at least partly with each other, e.g. on the same
circuit board.
In one embodiment of the invention the aforementioned controllable switch
connected to the second power supply circuit is controlled during the power
supply permitting mode of the aforementioned switch with switching frequency
modulation, such as with prior-art PWM modulation (pulse width modulation).
Advantages of the invention
With the invention at least one of the following advantages, among others, is
achieved:
- When the standby mode of the elevator system is determined with the
control arrangement on the basis of one or more activation signals, and
on the basis of the determination a control signal of the standby mode is
sent to at least one control appliance of the elevator system, the standby
mode of one or more control appliances of the elevator system can be
controlled in a controlled manner, in which case it is possible on the
basis of the determination to separately select the appliances to be
controlled into standby mode. In addition, the duration of the standby
mode of different appliances can differ from each other. It is further
possible to control those control appliances whose recovery from
standby mode is quick after a first short time delay, and to also control
other devices whose recovery from standby mode is slower after a longer
time delay. In this case e.g. recovery from a standby mode during heavy
traffic in the daytime can be quicker than, for instance, at night when
there is less traffic. In addition, different activation signals can affect the
selection of the elevator system control appliances to be controlled, as
well as e.g. the duration of the standby mode.
- The elevator system can be switched to standby mode e.g. in the
situation when the set time from the last landing call has passed. On the
other hand, the standby mode can be terminated when a new landing
call is registered.
- When a control appliance of the safety arrangement of the elevator
detects that safety is endangered, the control appliance of the safety
arrangement can send information about this in its status signal to the
control arrangement of the standby mode, and the standby mode can be
terminated on the basis of the aforementioned status signal. In this case
the standby mode can be terminated e.g. in the situation when the
control appliance of the safety arrangement has detected that the landing
door of the elevator has opened to the elevator shaft.
- The standby mode can be terminated e.g. if moving of the elevator car is
detected. This movement information can be read e.g. from a movement
signal of the elevator car, such as a signal of the elevator motor or of the
encoder of the car roof or of the acceleration sensor.
- The elevator system can be brought into a standby mode in the situation
when it is detected from the status signal of the power supply of the
elevator that the power supply of the elevator, e.g. the network voltage
supply, is disconnected. During this so-called battery backup the sensors
that are important from the standpoint of the safety of the elevator can
also be read periodically, in which case operating power is supplied to
the sensors only intermittently, which of course reduces the current
consumption of the elevator system.
- It is possible to determine the stopping of the elevator car in the floor
zone from the signal of the sensor of the stopping floor of the elevator,
e.g. from the signal of an ultrasound sensor fitted to the stopping floor, of
a hall sensor or magnetic switch reading a permanent magnet fitted to
the stopping floor. If the aforementioned floor zone is set as a safe
stopping zone for the elevator car, at least one control appliance of the
elevator system, e.g. the power supply appliance of the elevator motor,
can be controlled into standby mode.
- If a first and a second power supply circuit is fitted to at least one control
appliance of the elevator system such that the power supply from the
output of the second power supply circuit can be either allowed or
prevented with the control of the controllable switch, the second power
supply circuit can extinguish as presented in the invention for the
duration of the standby mode, in which case the current consumption of
the aforementioned control appliance and at the same time of the whole
elevator system decreases. Control electronics of a control device can
also if necessary be fitted to the first and the second power supply circuit
such that the first power supply circuit comprises only a controller, such
as a small microcontroller with low current consumption, as well as the
interface electronics of the inputs and outputs for the activation signals
and control signals. In this case the components that consume most
current, such as the power-consuming resistors and other passive
components, can be disposed in the second power supply circuit. In this
case also each aforementioned control appliance of the elevator system
can if necessary can be brought into standby mode independently and
irrespective of the other aforementioned control appliances.
- When the power supply of the sensor that measures movement of the
elevator car is taken from the output of the second power supply circuit, it
is possible in the standby mode of the elevator to supply power only
periodically and at the set time that is needed to read the sensor. The
sensor can in this case be read e.g. with a controller fitted to the first
power supply circuit.
- When the aforementioned controllable switch is fitted to the power supply
circuit of the brake of the elevator such that the power supply to the
opener of the brake is either allowed or prevented with the control of the
switch, it is possible to supply power to the aforementioned opener of the
brake, such as to the coil of the machinery brake, in a standby mode of
the brake control appliance only in the situation when the brake is tested.
For example testing of the machinery brake of the elevator is performed
just a few times a day. In this case the machinery brakes of the elevator
machine are opened one at a time, and movement of the elevator car is
monitored from the movement signal of the elevator car.
- When power is supplied with the control appliance of the safety
arrangement in the standby mode of the elevator system to the sensors
measuring the safety of the elevator, e.g. to the sensors of the landing
door, periodically only for the time interval needed for measurement, the
current consumption of the elevator system decreases, and in this case it
is possible also e.g. during battery backup to measure, for instance, the
position of the landing doors and to detect e.g. the unauthorized
movement of a person into the elevator shaft. In this case the safety of
the elevator system improves when comparing it to e.g. prior-art elevator
systems in which the current supply of the safety circuit of the sensors of
the landing door is disconnected completely when the power supply of
the elevator is disconnected.
Presentation of drawings
In the following, the invention will be described in more detail by the aid of a few
examples of its embodiments with reference to the attached drawings, wherein
Fig. 1 presents an elevator system, into which a control
arrangement according to the invention is fitted.
Fig. 2 presents a control appliance according to the invention.
Fig. 3 presents a control arrangement according to the
invention.
Embodiments
Fig. 1 presents an elevator system, into which a control arrangement is fitted for
placing at least one control appliance 2,3,4,5,6,7,8.9,10 of the eievator system
into standby mode or for terminating a standby mode. A serial bus 26 is
between the control appliances of the elevator system, via which bus the control
appliances communicate with each other. The elevator car 24 is moved in the
elevator shaft via ropes connected to the traction sheave 25 of the elevator
motor. The power supply of the elevator motor occurs with a power supply
appliance 2 of the elevator motor, which is here a frequency converter between
the power source 3 and the elevator motor. The power supply and thus also the
movement of the elevator car 24 is regulated with the movement control
appliance 4 of the elevator system that is integrated into the frequency
converter. The traffic control appliance 5 of the elevator system takes care of
regulating the traffic of the elevator system, such as the allocation of landing
calls. The control appliances 7 of the landing calls transmit landing calls to the
traffic control appliance 5. The control appliance 9 of the elevator car comprises
a control of the door of the elevator car, a control of the car calls as well as a
measurement of the movement of the elevator car with an acceleration sensor.
The control appliance 8 of the lighting supervises the regulation of the lighting of
the elevator car. The brake control appliance 6 of the elevator supplies power to
the coil of the machinery brake with the control of the control unit of the brake
control appliance. The power supply to the coil of the machinery brake takes
place from the power supply circuit 27 of the safety devices of the elevator. The
power supply to the power supply circuit of the safety devices can also be
disconnected with the control appliance 10 of the safety arrangement of the
elevator. The control appliance 10 of the safety arrangement reads the sensors
that measure the safety of the elevator, such as the safety switches of the
landing door of the elevator or of the car door, the end limit switches of the
elevator shaft or the movement signals of the elevator car. If it detects that
safety is endangered, the control appliance 10 controls the machinery brake 13
of the elevator and also if necessary the wedge brake, i.e. the safety gear (not
shown in the figure) of the elevator car. In addition the control appliance 10 of
the safety arrangement prevents power supply from the power source 3 to the
elevator motor by opening the power supply circuit with controllable switches.
The control arrangement 11 for placing at least one control appliance of the
elevator system into standby mode or for terminating the standby mode is
integrated into the traffic control appliance 5 of the elevator system. The control
arrangement 11 determines the standby mode on the basis of the activation
signals. The control arrangement measures the time that has passed from the
latest landing call signal 12, and after a set time delay the control arrangement
sets switching to the standby mode of the elevator system. In this case the
control arrangement sends a control signal 21 of the standby mode to the
control appliances 2,3,4,5,6,7,8,9,10 of the elevator system via the serial bus
between the control appliances, if it detects a new landing call signal 12 the
control arrangement 11 sends a control signal 21 of the stanby mode to the
control appliances of the elevator system to terminate the standby mode. The
control arrangement also reads the status signal 14 of the control appliance 10
of the safety arrangement of the elevator, and on the basis of the status signal
sets a standby mode to be terminated e.g. when a landing door opens into the
elevator shaft. When the control arrangement 11 detects the adequate duration
of the presence of the elevator car 24 in the stopping zone on the basis of the
signal of the sensor 16 of the stopping floor of the elevator, the control
arrangement deduces that the elevator car has stopped at the floor. In this case
the control arrangement sets the standby mode, and sends the control signal of
the standby mode to the frequency converter 2 as well as to the traffic control
appliance 4, in which case the frequency converter as well as the traffic control
appliance switch to standby mode while the elevator car stands at the floor.
Dropping of the network supply voltage of the elevator system is detected from
the status signal of the power supply 3 of the elevator. In this case the control
arrangement sets the standby mode on the basis of the status signal, and
sends the control signal 21 of the standby mode to the control appliances of the
elevator system. Since the power supply of the whole elevator system occurs
from the battery backup when the network voltage 3 has disconnected, the
control appliances 2,3,4,5,6,7,8,9,10 of the elevator system are controlled as
comprehensively as possible to standby mode in order to reduce the current
consumption. When the elevator car is standing at the floor during standby
mode, the movement status of the elevator car is determined on the basis of the
signal of the sensor 16 of the stopping floor of the elevator. Otherwise the
movement status of the elevator car is periodically measured during the standby
mode with the encoder connected to the traction sheave 25 of the elevator
motor such that approx. once a second power is supplied to the encoder for a
period of approx. 10-50 milliseconds, which time is needed to read the sensor.
The measured speed is aiso presented with a separate display appliance.
During battery backup mode the control appliance 10 of the safety arrangement
of the elevator supplies power periodically to the sensors that measure the
safety of the elevator once a second for a period of 10 - 50 milliseconds, which
time is needed to read these sensors. In this case the control appliance 10 of
the safety arrangement can on the basis of the aforementioned sensors, such
as the safety switches of the landing door, monitor the safety of the elevator
system also in the battery backup mode.
In the standby mode a brake test of the machinery brakes of the elevator is
performed with the brake control appliance 6 a few times per 24-hour period. In
this case power is supplied with the brake control appliance to one of two
machinery brakes of the elevator at a time, and the movement status of the
elevator car is measured with the encoder 23.
If it is detected in the measurements made during the standby mode that the
safety of the elevator car has been endangered, the elevator system is switched
to a mode in which drive with the elevator is prevented, and if necessary fault
data is sent to the remote monitoring system of the elevator.
Fig. 2 presents a control appliance 2,3,4,5,6,7,8,9,10 of an elevator system. The
first 17 and the second 18, 28 power supply circuit are fitted into the control
appliance. The power load 29 is connected to the output 18 of the second
power supply circuit. A controllable switch 19 is connected between the input 28
and the output 18 of the second power supply circuit such that power supply
from the output 18 of the second power supply circuit can be either allowed or
prevented with the control of the switch 19. A controller 20 is connected to the
first power supply circuit 17, which controller comprises an input for the control
signal 21 of the standby mode and also an output for the control signal 22 of the
aforementioned controllable switch. The controller 20 is fitted to control the
switch 19 on the basis of the control signal 21 of the standby mode such that
power supply to the power load 29 is permitted when the switch 19 is
conducting, and power supply to the power load 29 is prevented when the
switch 19 is open, in which case the power consumption of the control
appliances 2,3,4,5,6,7,8,9,10 of the elevator system decreases.
Fig. 3 presents a control arrangement 11 for placing at least one control
appliance 2,3,4,5,6,7,8,9,10 of the elevator system into standby mode or for
terminating a standby mode. The control arrangement 11 reads the activation
signals, such as the landing call signal 12, the status signal 13 of the control
appliance of the safety arrangement of the elevator, the speed signal v of the
elevator car, the status signal of the power supply 3 of the elevator and also the
signal of the sensor 16 of the stopping floor of the elevator. On the basis of the
control signals read the control arrangement 11 sends if necessary a control
signal 21 of the standby mode to the control appliances 2,3,4,5,6,7,8,9,10 of the
elevator system via the serial bus 26 between them.
The invention is described above by the aid of a few examples of its
embodiment. It is obvious to the person skilled in the art that the invention is not
limited to the embodiments described above, but that many other applications
are possible within the scope of the inventive concept defined by the claims
presented below.
The controller 20 of standby mode as well as the controllable switch 19 can be
separate components to each other, or they can be integrated into the same
control component. The aforementioned controller 20 can also be implemented
e.g. with a microcontroller.
CLAIMS
1. Elevator system (1), which comprises control appliances
(2,3,4,5,6,7,8,9,10) of the elevator system fitted to communicate between
themselves, and which elevator system comprises a control arrangement
(11) for placing at least one control appliance of the elevator system into
a standby mode or for terminating a standby mode, characterized in
that the aforementioned control arrangement (11) is fitted to set the
standby mode on the basis of at least one activation signal,
and in that the control arrangement is fitted to send a control signal (21)
of the standby mode to at least one control appliance (2,3,4,5,6,7,8,9,10)
of the elevator system,
which control appliance of the elevator system comprises a first (17) and
a second (18) power supply circuit,
to which second power supply circuit (18) a controllable switch (19) is
connected such that power supply from the output (18) of the second
power supply circuit can be either allowed or prevented with the control
of the switch (19),
and to which first power supply circuit (17) a controller (20) is connected,
which controller comprises an input for the control signal (21) of the
standby mode,
and in that the aforementioned controller is fitted to control the
aforementioned switch (19) on the basis of the control signal of the
standby mode.
2. Elevator system according to claim 1, characterized in that at least one
of the following functions as the activation signal:
- the landing call signal (12)
- the status signal (14) of the control appliance of the safety
arrangement of the elevator
- the movement signal of the elevator car
- the status signal of the power supply (3) of the elevator
- the signal of the sensor (16) of the stopping floor of the elevator
3. Elevator system according to any of the preceding claims, characterized
in that at least one control appliance (2,3,4,5,6,7,8,9,10) of the elevator
system is fitted to switch to standby mode after the elevator car has
stopped at the stopping floor (16) of the elevator.
4. Elevator system according to any of the preceding claims, characterized
in that the power supply of the sensor (23) that measures the movement
of the elevator car is in the output (18) of the second brake power supply
circuit, and in that the aforementioned controllable switch (19) is
periodically controlled to the mode of permitted power supply in the
standby mode of the control appliance of the elevator for reading the
sensor that measures the movement of the elevator car one preset
interval at a time.
5. Elevator system according to any of the preceding claims, characterized
in that the power supply to the brake (13) of the elevator is fitted to occur
with the control of the brake control appliance (6) of the elevator via the
power supply circuit (27) of the safety devices of the elevator, the
aforementioned controllable switch (19) is fitted to the power supply
circuit of the brake of the elevator such that power supply to the opener
of the brake (13) can be either allowed or prevented with the control of
the switch (19), and in that the aforementioned switch (19) is periodically
controlled to the state of permitted power supply in the standby mode of
the brake control appliance of the elevator for testing the brake (13) of
the elevator one preset interval at a time.
6. Elevator system according to any of the preceding claims, characterized
in that the lighting of the elevator is controlled on the basis of a control
signal (21) of the standby mode received by the control appliance (8) of
the lighting of the elevator.
7. Elevator system according to any of the preceding claims, characterized
in that the control appliance (10) of the safety arrangement of the
elevator is fitted to periodically supply power in its standby mode to at
least one sensor that measures the safety of the elevator for reading the
aforementioned sensor one preset interval at a time.
8. Method for fitting a standby mode in an elevator system (1), in which
method control appliances (2,3,4,5,6,7,8,9,10) that communicate
between themselves are fitted to the elevator system, and at least one
aforementioned control appliance of the elevator system is controlled into
standby mode or the standby mode of at least one control appliance of
the elevator system is terminated, characterized in that:
- the standby mode of the elevator is determined on the basis of at
least one activation signal, and
- a control signal (21) of the standby mode is sent to at least one
control appliance (2,3,4,5,6,7,8,9,10) of the elevator system
- a first (17) and a second (18) power supply circuit are fitted to the
control appliance (2,3,4,5,6,7,8,9,10) of the elevator system
- a controllable switch (19) is connected to the second power supply
circuit such that power supply from the output (18) of the second
power supply circuit can be either allowed or prevented with the
control of the switch (19)
- a controller (20) is fitted to the first power supply circuit (17), and
also an input for the control signal (21) of the standby mode is
fitted in connection with the controller
- the control signal (21) of the standby mode is read, and the switch
(19) is controlled with the controller (20) on the basis of the control
signal (21)
9. Method according to claim 8, characterized in that:
- a sensor (23) that measures the movement of the elevator car is
fitted to the output (18) of the second power supply circuit
- the control signal (21) of the standby mode is read and the
controller (20) is switched to standby mode according to the
comtrol singnal read,
in the standby mode the switch (19) is periodically controlled to
the mode permitting power supply for at least one preset interval
at a time, and
- the sensor (23) that measures the movement of the elevator car is
read during the permitted power supply mode of the switch (19)

The invention relates lo
an elevator system (1), which comprises
control appliances (2, 3, 4, 5, 6, 7, 8,
9, 10) of the elevator system fitted to
communicate between themselves. The
elevator system comprises a control
arrangement (11) for placing at least one
control appliance into standby mode or for
terminating the standby mode. The control
arrangement is fitted to set the standby
mode on the basis of at least one activation
signal, as well as lo send a control signal
(21) of the standby mode to at least one
control appliance of the elevator system.
The invention also relates to a method
for fitting a standby mode into an elevator
system.