iS7 Encoder Setup
3
LSIS iS7 Encoder Setup
Rev A_10-31-2018
Troubleshooting
Encoder direction error
If during the auto tuning process an encoder direction message is received.
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Is motor direction correct? Verify the motor direction is correct; FWD on keypad should match forward running for
the application. If it is incorrect, swap the U and W motor wires and run the tune again. If the motor direction is
correct set APO-05=- (A + B) and run the tune again.
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Parameter APO-08 will display the encoder’s frequency. While running FWD this should display a positive
frequency close to the commanded reference. While running REV it will go negative. You can also turn the motor
by hand while stopped and view the feedback.
Motor is not getting up to speed or is pulling high amperage
If the VFDs output speed is not matching the command reference or the motor is pulling high amps.
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Check the encoder wiring. If B+ and B- are swapped, for example, this symptom can occur.
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Confirm that encoder PPR set in APO-06 matches the encoder’s nameplate.
