Yaskawa GPD503 Drive - Manual (Page 107)

Section 5. OPERATION AT LOAD
After completing the start-up, and programming of constants, turn off the AC main circuit
power. Make additional wiring connections required for the external control functions
selected by the constant programming. Connect the driven machine to the motor. Verify
that the driven machine is in running condition, and that no dangerous conditions exist
around the drive system.
OPERATING PRECAUTIONS
• Before applying a RUN command to the GPD 503, verify that the motor is
stopped. If the application requires the capability of restarting a coasting motor,
constant Cn-13 must be set to give DC Braking Time at Start.
• The motor cooling effect lowers during low-speed running. The torque needs to
be reduced in accordance with the frequency. For the reduction ratio, refer to the
motor catalog or technical sheet.
• NEVER use a motor whose "FLA" current exceeds the GPD 503 rating.
• When two or more motors are operated by one GPD 503, verify that the total
motor current DOES NOT EXCEED the GPD 503 rating.
• When starting and stopping the motor, use the operation signals (RUN/STOP,
FWD/REV), NOT the magnetic contactor on the power supply side.
Run the motor under load with control by the Digital Operator using the same procedure
as for the Test Run (Table 4-1). If Digital Operator is used in combination with external
commands or external commands only are used, the procedure must be altered
accordingly.
For preset starting (one-touch operation after setting the frequency), perform the following:
1. Set the frequency and press RUN. Motor accelerates, at the rate corresponding to
the preset accel time, to the preset frequency. The accel time is set too short
relative to the load if the RPM of the accelerating motor does not increase smoothly
(stall prevention during acceleration is functioning) or if a fault indication is
displayed on the Digital Operator.
2. Press STOP. Motor decelerates, at the rate corresponding to the preset decel time,
to a stop. The decel time is set too short relative to the load if the RPM of the
decelerating motor does not decrease smoothly (stall prevention during deceleration
is functioning) or if a fault indication is displayed on the Digital Operator.
5-1