Fan Continuity Test - GE AF-650 GP Operating Instructions Manual

6.2.4 Fan Continuity Test

Make all continuity checks using an ohmmeter set to Rx1 scale. A digital or analog ohmmeter can be used. Some instability may result when measuring resistance
of a transformer with a multimeter. This can be reduced by turning off the auto-ranging function and setting the measurement manually.
Control Source
Inverter module 2
Inverter module 2
Inverter module 2
Inverter module 1
Inverter module 1
Inverter module 2
Inverter module 3 (if unit has 3 modules) Inverter module 3 heatsink
Check 1: Fan Fuse Test
Check the 15 amp fan fuse on the top of each inverter module.
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An open fuse could indicate additional faults. Replace the fuse and continue the fan checks.
Check 2: Continuity from the AC Input Terminals to Each Inverter Module.
For the following tests, unplug the 10-pin connector on the top of each Inverter Module. Read the terminals on the Inverter Module side of the connector (female
connector). The 8-pin connector must be plugged into the top of the Inverter Module. The 12-pin connector must be plugged into the top of the Rectifier Module.
1. Measure from L3 (T) to terminal 1. Reading of <1 Ohm should be indicated. This measurement should be made once for each Inverter Module.
2. Measure from L3 (S) to terminal 2. Reading of <1 Ohm should be indicated. This measurement should be made once for each Inverter Module.
Incorrect reading
An incorrect reading could indicate a number of different problems.
1. Perform the Rectifier Module Soft Charge Fuse Test. If any soft charge fuses are open, replace the fuse and retest the fan continuity.
2. Check the wire harness between the Rectifier Module and each Inverter Module. At the Rectifier Module this is the 12-pin connector. At each Inverter
Module this is the 8-pin connector. If the wire harness is the problem, replace and retest the fan continuity.
3. If the above checks do not identify the problem, remove the faulty Inverter Module and check the connections between the connectors on the top of
the module and the power card. If these connections are the problem, replace and retest the fan continuity.
After this check, plug in all connectors on top of the Rectifier Module and the Inverter Modules.
Check 3: Fan Transformer Ohm Test
For the following test, unplug the 10-pin connector on the top of each Inverter Module. Read the terminals on the connector end of the wire harness (male
connector). Remember the same test should be performed for each fan transformer. There is one fan transformer for each Inverter Module installed in the drive.
Readings for 380 - 480V drives
Measure between pins 1 and 2. Should read approximately 4 Ω.
1.
2. Measure between pins 1 and 7. Should read approximately 3 Ω.
Measure between pins 2 and 7. Should read approximately 1 Ω.
3.
Readings for 525 - 690V drives
Measure between pins 1 and 2. Should read approximately 7.4 Ωs.
1.
2. Measure between pins 1 and 7. Should read approximately 3.6 Ω.
Measure between pins 2 and 7. Should read approximately 3.2 Ω.
3.
Incorrect reading
An incorrect reading would indicate a defective fan transformer. Replace the fan transformer.
After this check, plug in the 10-pin connector on the top of each Inverter Module.
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Fan Location
Rectifier cabinet door
Inverter cabinet left door
Inverter cabinet right door
Rectifier heatsink
Inverter module 1 heatsink
Inverter module 2 heatsink
High Power Service Manual for Unit Sizes 6x