Danfoss VLT FC 100 Service Manual page 92

Test Procedures
6. Using an analog voltmeter or a DVM capable of
measuring true RMS, measure phase-to-phase
output voltage on all three phases: U to V, U to
W, V to W. All voltages must be balanced within
8 V. If unbalanced voltage is measured, refer to
chapter 6.4.2 Input Voltage Test.
7. Stop the adjustable frequency drive and remove
input power. Allow 20 minutes for DC capacitors
to discharge fully.
8. Reconnect motor cables to adjustable frequency
drive output terminals (U, V, W).
9. Reapply power and restart adjustable frequency
6 6
drive. Adjust motor speed to a nominal level.
10. Using a clamp-on style ammeter, measure output
current on each output phase. All currents must
be balanced.
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Service Manual
Danfoss A/S © Rev. 2014-02-10 All rights reserved. MG94A222