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VFD68 Variable Frequency Drives
72
Table 70: Motor Does Not Start
Check
Points
Possible Cause
Action
Main
Circuit
Appropriate power supply voltage is not applied.
(Operation panel display is not provided.)
Power ON moulded case circuit breaker (MCCB), an
earth leakage circuit breaker (ELB), or a magnetic
contactor (MC).
Check for the proper input voltage, input phase loss,
and wiring.
Motor is not connected properly.
Check the wiring between the VFD and the motor.
The jumper from terminal P/+ to terminal P1 (on
VFD68Bxx and VFD68Cxx models) or from
terminal P to terminal P1 (on VFD68Dxx models)
has been removed.
Connect a jumper from terminal P/+ or terminal P to
terminal P1.
Input
Signal
Analog input signal is not enough to start the
motor.
Check for proper voltage on analog inputs.
Verify that the PU and EXT LEDs are illuminated.
Terminal STR is connected to terminal SD.
Disable the STR feature by setting P. 78 = 1. Connect
terminal SD to terminal STF to run the motor in the
forward direction.
Frequency command is zero.
(RUN LED on the operation panel is flickering.)
Check the frequency command source and enter a
frequency command.
SINK-SOURCE jumper is set incorrectly.
(RUN LED on the operation panel is flickering.)
Check that the control logic switchover jumper
connector is installed in the SINK position:
•
VFD68Bxx and VFD68Cxx: Figure 20 on page 29
•
VFD68Dxx: Figure 22 on page 31
If it is not installed correctly, input signal is not
recognized.
Jumper wires between S1 and SC, S2 and SC
are disconnected (VFD68Bxx and VFD68Cxx
models only).
Verify that jumper wires connect together terminals S1,
S2, and SC.
Voltage/current input switch is not correctly set
for analog input signal (0 to 5 V or 0 to 10 V,
4 to 20 mA) (VFD68Bxx and VFD68Cxx models
only).
(RUN LED on the operation panel is flickering.)
Set P. 73, P.266, P.267, and a voltage/current input
switch correctly, then input an analog signal in
accordance with the setting.
Param.
Setting
Motor Speed vs. Pressure (C 2 to C 7) settings
are improper.
Check the Motor Speed vs. Pressure (C 2 to C 7)
calculations and settings.
Load
Load is too heavy.
Reduce the load.
Shaft is locked.
Inspect the machine (motor).
Others
Operation panel display shows an error (E.OC1).
When any fault occurs, take an appropriate corrective
action, then reset the VFD, and resume the operation.