Danfoss VLT HVAC FC 100, Service Manual, Page: 127 / 220

Voltage (AC) FC 102 FC202 FC 302 Resistance (Ohms)
380-500 P110 P110 P90K 4.5
380-500 P132 P132 P110 3.8
380-500 P160 P160 P132 3.1
380-500 P200 P200 P160 2.6
380-500 P250 P250 P200 5.1
380-500 P315 P315 P250 4.2
380-500 P355 P355 P315 2.6
380-500 P400 P400 P355 2.6
380-500 P450 P450 P400 2.3
525-690 P45K P45K P37K 5.9
525-690 P55K P55K P45K 5.9
525-690 P75K P75K P55K 5.9
525-690 P90K P90K P75K 5.9
525-690 P110 P110 P90K 5.9
525-690 P132 P132 P110 5.9
525-690 P160 P160 P132 4.5
525-690 P200 P200 P160 3.1
525-690 P250 P250 P200 3.1
525-690 P315 P315 P250 2.6
525-690 P400 P400 P315 5.1
525-690 P450 P450 P355 4.5
525-690 P500 P500 P400 4.5
525-690 P560 P560 P500 3.8
525-690 P630 P630 P560 2.6
Table 6.2: Scaling Card Resistance Values
6.3.15 Fan Tests
The fan control circuit is made up of the fan transformer and the control circuitry located on the
power card along with control signals for ON, OFF, and speed control from the control card. Since
the fans do not necessarily run at all times, see the description for cooling fan operation under
sequence of operation in Section 3.3.5.
Supply voltage
Supply voltage for the fans is from the soft charge card to power card connector
MK106. First, verify the supply voltage is present as follows.
1. Use a voltmeter to measure the AC phase to phase voltage at R, S, and T of power card
connector MK106. It should equal main supply voltage applied to adjustable frequency
drive.
2. If voltage is not present, ensure proper AC line voltage is applied to adjustable frequency
drive. Conduct Input Voltage test (6.3.2).
3. If AC line voltage is present at the input of the adjustable frequency drive but not at
MK106 of the power card, conduct a static test of the soft charge fuses (6.2.1).
4. If voltage is present at MK106, check the voltage at the fan transformer read from con-
nector CN2 located near the transformer. With a voltmeter, read the AC voltage at CN2
pins 1 and 3. The voltage should correspond to the main AC line voltage applied to the
adjustable frequency drive.
5. If voltage is not present, ensure jumpers are in place at power card connector FK103.
Otherwise, connect an external source of power to terminal FK103 for fan supply voltage.
If the jumpers are in place or an auxiliary supply is connected and powered but no voltage is
present at the fan transformer connector CN2, the power card is likely defective. Replace the
power card in accordance with the disassembly instructions in Section 7 or 8.
6 Test Procedures
High Power Service Manual for VLT
®
FC Series
Adjustable Frequency Drives
6-36
MG.90.L1.22 - VLT ® is a registered Danfoss trademark
6