14
Checking Power Modules and Motor Input with
Input Power Off
Use the following procedure to check the drive’s power module
circuitry with power off:
1. Turn off and lock out input power. Wait 5 minutes.
2. Verify there is no voltage at the drive’s input power terminals.
3. Using a voltmeter, check the DC bus potential as described
in the section Verifying That DC Bus Capacitors Are Dis-
charged on page 11 to ensure the DC bus capacitors are
discharged.
4. Disconnect the motor from the drive.
5. Check all AC line and DC bus fuses.
6. Use a multimeter to check the input diodes and output
IGBTs if a fuse is open. See Table 6.
7. Check motor impedance.
8. Reconnect the motor to the drive.
9. Reapply input power.
141 206 449 Autn Enc Angle P78 [Encdrlss AngComp] is out of range. See VFD Fault Code 15
142 206 449 Autn Spd Rstrct See VFD Fault Code 15 See VFD Fault Code 15
143 206 449 Autotune CurReg See VFD Fault Code 15 See VFD Fault Code 15
144 206 449 Autotune Inertia See VFD Fault Code 15 See VFD Fault Code 15
145 206 449 Autotune Travel See VFD Fault Code 15 See VFD Fault Code 15
168 206 444
HeatSinkUnder-
Tmp
Heatsink temperature sensor is reporting
a value below –18.7 C (–1.66 F) or the
sensor feedback circuit is open.
Check heat sink temperature sensor. Check heat
sink temperature.
210 206 449
HW En Jumper
Out
See VFD Fault Code 15 See VFD Fault Code 15
211 206 449 Safety Brd Fault See VFD Fault Code 15 See VFD Fault Code 15
213 206 449 Safety Jumper In See VFD Fault Code 15 See VFD Fault Code 15
226 224 448 VFD Comm loss
The device at the port has stopped com-
municating with the main control board.
Verify that the device is present and functional.
Verify network connections. Verify options
installed in appropriable ports are seated in the
port and secured with mounting screws.
291 206 449 HSFan Lifwe See VFD Fault Code 15 See VFD Fault Code 15
292 206 449 InFan Life See VFD Fault Code 15 See VFD Fault Code 15
293 206 449 MtrBrg Life See VFD Fault Code 15 See VFD Fault Code 15
294 206 449 MtrBrg Lube See VFD Fault Code 15 See VFD Fault Code 15
295 206 449 MachBrg life See VFD Fault Code 15 See VFD Fault Code 15
296 206 449 MachBrg Lube See VFD Fault Code 15 See VFD Fault Code 15
315 206 449 Excess Psn Error See VFD Fault Code 15 See VFD Fault Code 15
351 209 426 In Cur Share L1
There is an input current sharing imbal-
ance between parallel converters
in the AC line indicated that is greater
than 15% of the converter rated current
See VFD Fault Code 15
352 209 426 In Cur Share L2
There is an input current sharing imbal-
ance between parallel converters
in the AC line indicated that is greater
than 15% of the converter rated current
See VFD Fault Code 15
353 209 426 In Cur Share L3
There is an input current sharing imbal-
ance between parallel converters
in the AC line indicated that is greater
than 15% of the converter rated current
See VFD Fault Code 15
Table 5 — Powerflex 755 Fault Code Descriptions and Corrective Actions (cont)
VFD
FAULT
CODE
ON VFD
HIST
SCREEN
ICVC
FAULT
STATE
PIC6
FAULT
STATE
FAULT TYPE DESCRIPTION CORRECTIVE ACTION
WARNING
DC bus capacitors retain hazardous voltages after input power
has been disconnected. After disconnecting input power, wait
five (5) minutes for the DC bus capacitors to discharge and
then check the voltage with a voltmeter to ensure the DC bus
capacitors are discharged before touching any internal compo-
nents. Confirm that the DC bus has discharged before per-
forming diode checks. Failure to observe this precaution could
result in severe bodily injury or loss of life.
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