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 drive, verify that the motor is stopped. If
the application requires the capability of restarting a coasting motor, parameter
n070 must be set to give DC Braking Time at Start.
• The motor cooling effect is reduced 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 full-load amps exceeds the drive rating.
• When two or more motors are operated by one drive, verify that the total motor
current DOES NOT EXCEED the drive 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 2-1). If the 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.
3-1
Section 3. OPERATION AT LOAD
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