Initial Start-Up Or After Repair Drive Tests - Trane TR150 Service Manual

Test Procedures
6.5 Initial Start-up Or After Repair Drive
Tests
Perform these tests under the following conditions:
•
Starting a frequency converter for the first time.
•
Approaching a frequency converter that is
suspected of being faulty.
•
After repair of the frequency converter.
Following this procedure ensures that all circuitry in the
frequency converter is functioning properly before putting
it into operation.
1. Perform visual inspection procedures as described
in Table 4.1.
6 6
2. Perform static test procedures to ensure that the
frequency converter is safe to start.
3. Disconnect motor cables from output terminals
(U, V, W) of the frequency converter.
4. Apply AC power to frequency converter.
5. Give the frequency converter a run command and
slowly increase reference (speed command) to
approximately 40 Hz.
6. Use an analog voltmeter or a DVM capable of
measuring true RMS to measure phase-to-phase
output voltage on all 3-phases: U to V, U to W, V
to W. All voltages must be balanced within 8 V. If
measuring unbalanced voltage, refer to
chapter 6.4.6 Output Imbalance of Motor Supply
Voltage Test.
7. Stop the frequency converter and remove input
power. Wait for the discharge time listed in
Table 1.1 to allow DC capacitors to discharge fully.
8. Reconnect motor cables to frequency converter
output terminals (U, V, W).
9. Reapply power and restart the frequency
converter. Adjust motor speed to a nominal level.
10. Set load to 50%.
11. Using a clamp-on ammeter, measure output
current on each output phase. All currents must
be balanced.
12. The correct measurement is 50% rated current.
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