FIELD OF THE INVENTION
The invention relates to an improved Electrical panel for driving the main table of
Vertical Turning Lathe machine with AC servo motor.
BACKGROUND OF THE INVENTION
Table drive systems in Vertical Turning Lathe machine are normally equipped with DC
drive DC Motor and drive in the machine with then passage of time exhibit repeated
breakdowns in the machine and leading to high idle time. The MTTR (Mean Time To
Repair) of the machine becomes high. The availability of the machine to the production
was low. Repair of the equipment is difficult because the DC drive systems present
almost obsolete.
To overcome the above difficulties, a new panel with AC motor and drive that will
greatly reduce the MTTR of the machine.
OBJECTS OF THE INVENTION
• It is therefore an object of the invention to propose an improved Electrical panel for
driving the main table of Vertical Turning Lathe machine with AC Servo Motor which
reduces the Mean Time To Repair (MTTR) of the Machine.

. Another object of the invention is to propose an improved Electrical for driving
the main table of Vertical Turning Lathe machine with AC Servo Motor
which increases Mean Time Between Failure (MTBF) of the machine.
SUMMARY OF THE INVENTION
Accordingly, there is provided an improved Electrical panel for driving the main table of
Vertical Turning Lathe machine with AC Servo Motor which can be interfaced to an AC
Servo Drive. The axes in the machine are interfaced with this panel for safest operation.
The safety of the machine operation is ensured by simulating and checking the logic.
Following operations are included in the operator panel.
. Table running with 0 to max speed by adjusting a potentio-meter
• Jog mode with two speed inching operation for table movement
• Automatic Braking operations.
. Emergency Stop.

The logics are implemented with relays and contactors. New electronic circuit is
developed to give 10V reference point. Inching and Run speeds are controlled by
potentio-meters and relay logic. Forward/Reverse Operations of the Table has been
designed with relay logics. There are two speeds for Inching operation and present by
potentio-meters.
Following Indication lamps are provided for operator.
. Power Supply OK
. Drive Ok
• OLR Tripped
• Table Forward
• Table Reverse
The motor has been replaced with an AC Servo Motor Trial operations were conducted
and also continuous run test has been done. Load test has been conducted before
regular operation of the machine.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure 1, Figure 2, Figure 3 are newly designed Electrical Diagram given here for
reference. The wiring and interface has been done as per the given diagram.
Figure 4 - Newly built Electrical Panel
Figures 5 and Figure 6 - Internal Assembly of Newly built Electrical Panel
Figure 7 - Operator Panel
Figure 8 - Motor and Flange Assembly
DETAILED DESCRIPTION OF THE INVENTION
A new wiring diagram is designed as given in drawing Figure 1, Figure 2 and Figure 3.
After design of schematic diagram the panel (1 in Figure 4) and equipment’s were
identified. Mounting dimensions of the motor were checked. Mounting Plate (7 in Figure
8) is modified by milling and drilling. Motor (6 in Figure 8) is fixed with proper
alignment. The drive power supply (2 in Figure 5 and Figure 6) and AC drive (3 in
Figure 5 and Figure 6) are fixed in the panel. Contactor and relays are fixed in the panel
as per standards, 24V Power supply (4 in Figure 5 and Figure 6) and 10V Reference
supply has been fixed. A low speed and high speed inching operation is specially
provided in this system.

Internal wiring is done with proper capacity of wires. External interface wiring also has
been done with existing panel and motor.
Mounting Plate (7) is modified by milling and drilling. Motor (6 in Figure 8) is fixed with
proper alignment. After design of schematic diagram of the panel (1) consists of the
drive power supply (2), AC drive (3), 24V Power supply (4), 10V Reference and
accessories. A low speed and high speed inching operation is specially provided in this
system.
Panel Power up and checked for basis startup. Drive parameter has been entered and
tuning has been done.
Load test and trial operations are carried out. Machine handed over to production.

WE CLAIM :
1. An improved Electrical panel for driving the main table of Vertical Turning Lathe
machine with AC Servo Moor, the improvement is characterized in that :-
- providing an AC Servo Motor duly mounted on the machine through
applicable modification of the mounting plate to ensure desiredalignment;
- a plurality of indication lamps;
- electronic control circuit to provide 10V reference point;
- logic circuits consisting of relays and contactors embedded on the panel
control forward/reverse operations of the main table including two speed
inching and run speed duly controllable by potentio-meters;
wherein the machine table interfaced with the panel and the panel is enabled to :-
- run the table within zero to maximum speed controllable by the potentio-
meters;
- allow jog-mode operation with two speed inching for the table movement;
- implement automatic braking operations; and
- activate emergency stop signal command.

2. The panel as claimed in claim 1, wherein each of said plurality of indication
lamps guides the operator to know the status parameters based on the status
exhibited by the lamps.