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.
Measure from L3 (T) to MK107 terminal 8. Reading of <1ohm should be indicated.
2.
Measure from L2 (S) to MK107 terminal 1. A 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
FC 102
FC202
FC 302
A
B
C
D
380-500
P315
P315
P250
15
12
4
21
no
380-500
P355
P355
P315
4
3
1
4
yes
380-500
P400
P400
P355
4
3
1
4
yes
380-500
P450
P450
P400
4
3
1
4
yes
525-690
P400
P400
P355
20
8
12
21
no
525-690
P500
P500
P400
20
8
12
21
no
525-690
P560
P560
P500
7.4
3.6
3.2
4
yes
525-690
P630
P630
P560
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.
6 Test Procedures
High Power Service Manual for VLT
®
FC Series
Adjustable Frequency Drives
6-18
MG.90.L1.22 - VLT
®
is a registered Danfoss trademark
6
Содержание VLT HVAC FC 100
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