Troubleshooting With No Fault Display - GE VAT2000 Instruction Manual

8-5 Troubleshooting with no fault display

The causes and countermeasures for errors with no fault display are shown in Table 8-5.
Phenomenon
Motor does not run
Motor runs in opposite
direction
Motor runs but the speed does
not vary
Motor acceleration/
deceleration is not smooth
Motor speed varies during
constant speed operation
Motor speed is too high or low 1. The number of poles or voltage may be incorrect.
8. Maintenance and Inspection
Table 8-5 Troubleshooting
Causes and countermeasures
1. The input/output wiring may be improper, or phase or power failure may
have occurred.
Inspect and correct the wiring.
2. The motor may be locked or the load excessively heavy.
Reduce the load.
3. The reverse run interlock function (C09-3) may be set or the other
parameters may be incorrect.
Check the parameters.
4. The voltage may not be output to the VAT2000 output terminal.
Measure the output voltage, and confirm that the three phases are
balanced.
5. The local/remote setting may be incorrect. Set according to the required
mode.
6. The encoder signal may not be input correctly. Check it
1. The output terminals U, V, and W sequence may be incorrect.
Interchange the phase sequence.
2. The sequence input wires for forward/reverse run may not be connected
to the specified terminals.
Connect the wires as follows:
Forward run: Short-circuit terminals RUN - RY0
Reverse run: Short-circuit terminals PSI1 - RY0
(When input terminal function setting is
C03-0=1 (default value))
1. The load may be too heavy.
Reduce the load.
2. The frequency setting signal level may be too low.
Check the signal level and circuit.
1. The motor acceleration/deceleration time setting (A01-0, 1) may be too
low.
Increase the acceleration/deceleration time.
1. The load may be fluctuating excessively or the load is too heavy.
Reduce the load or fluctuation.
2. The inverter-motor ratings may not match the load.
Select an inverter-motor set that matches the load.
Check the motor specifications.
2. The maximum frequency (speed) or base frequency [B00-4, 5 (B01-4,
5)] may be incorrect.
3. The motor terminal voltage may be low.
Use a thicker output cable.
8-8