Fan Continuity Tests: E-Frame Size - Danfoss VLT HVAC Drive FC 100 Service Manual

6 Test Procedures

6.2.10 Fan Continuity Tests: E-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 multi-
meter. 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.
2.
Incorrect reading
An incorrect reading would indicate a faulty cable connection. Replace the cable assembly.
6
Fan fuse test
1.
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.
2.
3.
AC Voltage
380-500
380-500
380-500
380-500
525-690
525-690
525-690
525-690
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.
6-18
Measure from L3 (T) to MK107 terminal 8. Reading of <1ohm should be indicated.
Measure from L2 (S) to MK107 terminal 1. A reading of <1 ohm should be indicated.
Test the fan fuses on the power card mounting plate by checking the continuity across
the fuse.
Measure between MK107 terminals 1 and 8. Should read approximately value A in Table
6-1.
Measure between MK107 terminals 8 and 12. Should read approximately value B in Table
6-1.
Measure between MK107 terminals 1 and 12. Should read approximately value C in Table
6-1.
Drive
FC 102 FC202 FC 302
P315 P315
P355 P355
P400 P400
P450 P450
P400 P400
P500 P500
P560 P560
P630 P630
MG.90.L1.22 - VLT
High Power Service Manual for VLT
Resistance (in Ohms)
A B C
P250 15 12 4
P315 4 3 1
P355 4 3 1
P400 4 3 1
P355 20 8 12
P400 20 8 12
P500 7.4 3.6 3.2
P560 7.4 3.6 3.2
® is a registered Danfoss trademark
Adjustable Frequency Drives
Heatsink Fan Fan Inductor
D
21 no
4 yes
4 yes
4 yes
21 no
21 no
4 yes
4 yes
®
FC Series