10 fan continuity tests: 5x-frame size – GE Industrial Solutions AF-600 FP High Power (460V_575V 150HP and above) User Manual
Page 84
6.2.10 Fan Continuity Tests: 5x-frame size
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.
To aid in making the measurements, unplug the MK107 from the power card.
Checking continuity of connections
For the following tests, read connector MK107 on the power card.
1.
Measure from L3 (T) to MK107 terminal 8. Reading of <1ohm should be indicated.
2.
Measure from L2 (S) to MK107 terminal 1. Reading of <1 ohm should be indicated.
Incorrect reading
An incorrect reading would indicate a faulty cable connection. Replace the cable assembly.
Fan fuse test
1.
Test the fan fuses on the power card mounting plate by checking the continuity across the fuse.
An open fuse could indicate additional faults. Replace the fuse and continue the fan checks.
Ohm test of transformer
For the following tests, read the plug end of the wire connected to MK107 on the power card.
1.
Measure between MK107 terminals 1 and 8. Should read approximately value A in Table 6-1.
2.
Measure between MK107 terminals 8 and 12. Should read approximately value B in Table 6-1.
3.
Measure between MK107 terminals 1 and 12. Should read approximately value C in Table 6-1.
AC Voltage
Drive
Resistance (in Ohms)
Heatsink Fan
Fan Inductor
AF-600 FP
AF-650 GP
A
B
C
D
380-480
450
350
15
12
4
21
no
380-480
500
450
4
3
1
4
yes
380-480
550
500
4
3
1
4
yes
380-480
600
550
4
3
1
4
yes
525-690
450
500
20
8
12
21
no
525-690
500
500
20
8
12
21
no
525-690
600
600
7.4
3.6
3.2
4
yes
525-690
650
650
7.4
3.6
3.2
4
yes
Table 6.1: Fan transformer resistance
Incorrect reading
An incorrect reading would indicate a defective fan transformer. Replace the fan transformer.
When finished, reconnect the MK107.
AF-650 GP and AF-600 FP High Power Service Manual
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