Static Test Procedures - Danfoss VLT HVAC Drive FC 100 Service Manual

6 Test Procedures

6.2 Static Test Procedures

All tests should be made with a meter capable of testing diodes. Use a digital volt/ohmmeter (VOM)
set on the diode scale or an analog ohmmeter set on Rx100 scale. Before making any checks,
disconnect all input, motor and brake resistor connections.
Figure 6-3 Power Card PCA Connector Identification is provided as a reference for finding the
appropriate connectors described in the test procedures in this section. Some connectors are op-
tional and not on all adjustable frequency drive configurations.
6
Diode drop
A diode drop reading will vary depending on the model of ohmmeter. Whatever the ohmmeter
displays as a typical forward bias diode is defined as a
typical DVM, the voltage drop across most components will be around .300 to .500. The opposite
reading is referred to as infinity and most DMVs will display the value OL for overload.
Figure 6.5: Power Card, and Mounting Plate
380–480/500V: Yellow tape on the main SMPS transformer in the upper right corner.
525–690V: White tape on the main SMPS transformer in the upper right corner.
1
2
3
4
5
6
7
8
6-4
NOTE!
For best troubleshooting results, it is recommended that static test procedures de-
scribed in this section be performed in the order presented.
1
16
15
14
13
Power card PCA3
Mounting plate
MK110
MK102
MK104
MK105
MK107
FK103
MG.90.L1.22 - VLT
High Power Service Manual for VLT
diode drop
3
4
5
2
12
10
8
7
11 9
130BX172.10
9 MK106
10 MK100
11 MK109
12 FK102
13 MK112 terminals 4, 5, 6
14 MK112 terminals 1, 2, 3
15 Scaling card
16 Scaling card standoff
® is a registered Danfoss trademark
Adjustable Frequency Drives
in these procedures. With a
6
®
FC Series