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 T4/T5 drives
1.
Measure between pins 1 and 2. Should read
approximately 4
Ω
.
2.
Measure between pins 1 and 7. Should read
approximately 3
Ω
.
3.
Measure between pins 2 and 7. Should read
approximately 1
Ω
.
Readings for T7 drives
1.
Measure between pins 1 and 2. Should read
approximately 7.4
Ω
s.
2.
Measure between pins 1 and 7. Should read
approximately 3.6
Ω
.
3.
Measure between pins 2 and 7. Should read
approximately 3.2
Ω
.
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.
Check 4: Inverter Cabinet and Rectifier Cabinet Door Fans
This checks the wiring between the Inverter Module and
the Cabinet Door Fans. All three door fans are controlled
from Inverter Module number 2 (middle inverter module in
F2/F4 drive or right inverter module in F1/F3 drive).
1.
Unplug the 10-pin connector from the top of
Inverter Module number 2. Read the terminals on
the wire harness side of the connector (male
connector).
2.
Measure between pins 5 and 10. Should read
approximately 16
Ω
.
Incorrect reading
An incorrect reading could indicate a failed fan or a bad
wire harness.
To check fans
1.
Disconnect the wiring from the fan terminals.
2.
Read across the fan terminals on each fan. A
reading of approximately 47
Ω
is expected.
Replace any defective fans and repeat the test.
Reconnect the 10-pin connector on top of Inverter Module
number 2.
Check 5: Rectifier Heat Sink Fan and Option Cabinet Door
Fan
1.
Unplug the 10-pin connector from the top of
Inverter Module number 1. Read the terminals on
the wire harness side of the connector (male
connector).
2.
If F1 or F2 Frame Drive (no option cabinet),
measure between pins 5 and 10. Should read
approximately 21
Ω
.
3.
If F3 or F4 Frame Drive (with option cabinet),
measure between pins 5 and 10. Should read
approximately 15
Ω
.
Incorrect Reading
In incorrect reading could indicate a failed fan or a bad
wire harness.
1.
Perform the Heat Sink Fan Ohm test on the
Rectifier Module.
2.
If F3 or F4 Frame (with option cabinet), perform
the Option Cabinet Door Fan test.
3.
If the above checks do not identify the problem,
remove the faulty Rectifier 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.
If the above checks do not identify the problem, replace
the wire harness between Inverter Module number 1 and
the Rectifier Module. Reconnect the 10-pin connector on
top of Inverter Module number 1.
Check 6: Heat Sink Fan Ohm Test
Check the resistance of the heat sink fan on each module.
Test Procedures
High Power Service Manual for Modular F Frame Drives
MG90K202 - VLT
®
is a registered Danfoss trademark
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