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Table 6
— Powerflex 755 Fault Code Descriptions and Corrective Actions (cont)
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 five minutes.
2. Verify there is no voltage at the drive’s input power termi-
nals.
3. Using a voltmeter, check the DC bus potential as de-
scribed above to ensure the DC bus capacitors are dis-
charged.
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.
7. Check motor impedance.
8. Reconnect the motor to the drive.
9. Reapply input power. See Tables 7 and 8.
Table 7
— Diode Checks
NOTE: Digital meters require a special diode check function
because the current sourced by the meter during a normal resis-
tance (Ohms) test is too low to accurately test a diode. Make sure
the meter is set to the diode test function. Voltage readings may not
be exact as shown in above tables, but look for consistency during
each of the 4 tests. When performing a test that should return infinity
(OL) as shown in above tables, you may see a value slowly climbing
toward infinity. This is a result of the meter charging a capacitor and
is normal.
VFD
FAULT
CODE
ON VFD
HIST
SCREEN
ICVC
FAULT
STATE
FAULT TYPE DESCRIPTION CORRECTIVE ACTION
168 206
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
HW En Jumper
Out
See VFD Fault Code 15 See VFD Fault Code 15
211 206 Safety Brd Fault See VFD Fault Code 15 See VFD Fault Code 15
213 206 Safety Jumper In See VFD Fault Code 15 See VFD Fault Code 15
291 206 HSFan Lifwe See VFD Fault Code 15 See VFD Fault Code 15
292 206 InFan Life See VFD Fault Code 15 See VFD Fault Code 15
293 206 MtrBrg Life See VFD Fault Code 15 See VFD Fault Code 15
294 206 MtrBrg Lube See VFD Fault Code 15 See VFD Fault Code 15
295 206 MachBrg life See VFD Fault Code 15 See VFD Fault Code 15
296 206 MachBrg Lube See VFD Fault Code 15 See VFD Fault Code 15
315 206 Excess Psn Error See VFD Fault Code 15 See VFD Fault Code 15
316 206 Node Fault Error See VFD Fault Code 15 See VFD Fault Code 15
WARNING
Confirm that the DC bus has discharged before performing
diode checks.
METER LEAD
METER READING
(+) (-)
R DC+ 0.5 V
S DC+ 0.5 V
T DC+ 0.5 V
R DC- infinite (OL)
S DC- Infinite (OL)
T DC- Infinite (OL)
U DC+ 0.5 V
V DC+ 0.5 V
W DC+ 0.5 V
U DC- infinite (OL)
V DC- Infinite (OL)
W DC- Infinite (OL)
DC+ R Infinite (OL)
DC+ S Infinite (OL)
DC+ T Infinite (OL)
DC- R 0.5 V
DC- S 0.5 V
DC- T 0.5 V
DC+ U Infinite (OL)
DC+ V Infinite (OL)
DC+ W Infinite (OL)
DC- U 0.5 V
DC- V 0.5 V
DC- W 0.5 V