Ohm test of transformer (380–500V)
For the following tests, read the plug end of connector CN2 that is connected to the transformer.
1.
Measure between CN2 terminals 1 and 3. Approximately 15 ohms should be read.
2.
Measure between CN2 terminals 1 and 2. Approximately 12 ohms should be read.
3.
Measure between CN2 terminals 2 and 3. Approximately 4 ohms should be read.
Incorrect reading
An incorrect reading would indicate a defective fan transformer. Replace the fan transformer.
When finished, be sure to reconnect CN2.
Ohm test of transformer (525–690 V)
For the following tests, read the plug end of connector CN2 that is connected to the transformer.
1.
Measure between CN2 terminals 1 and 3. Approximately 20 ohms should be read.
2.
Measure between CN2 terminals 1 and 2. Approximately 8 ohms should be read.
3.
Measure between CN2 terminals 2 and 3. Approximately 12 ohms should be read.
Incorrect reading
An incorrect reading would indicate a defective fan transformer. Replace the fan transformer.
When finished, be sure to reconnect CN2.
Ohm test of fans
1.
Measure between terminals 11 and 13 of power card connector MK107. A reading of 20
ohms should be indicated.
2.
On IP21 and IP 54 units: Disconnect the spade connectors from the door fan and repeat
the measurement. A reading of 21 ohms should be indicated.
3.
On IP21 and IP 54 units: Read the door fan terminals with the wires disconnected. A
reading of 400 ohms should be indicated.
4.
Reconnect the wires to the door fan.
6 Test Procedures
High Power Service Manual for VLT
®
FC Series
Adjustable Frequency Drives
6-16
MG.90.L1.22 - VLT
®
is a registered Danfoss trademark
6
Summary of Contents for VLT HVAC FC 100
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