Service Manual Instruction Manual
R&M Materials Handling, Inc. 
4501 Gateway Boulevard 
Springfield, Ohio 45502 
P.: (937) 328-5100 
FAX: (937) 325
-
5319
56/83 
R&M Materials Handling, I
nc. reserves the right to alter or amend the above information without notice.
undervoltage trip 
F 10  Input line 
supervision 
One input line phase is missing.  Check: 
•  supply voltage 
•  mains connection. 
X
F 11  Output phase 
supervision 
Current supervision has sensed that at least 
one of the motor phases has no current 
Check: 
•  motor cable connections 
•  measure motor phase currents and compare to display 
value 
  X 
F 12  Braking 
chopper 
supervision 
Braking chopper or braking resistor circuit 
has failed. Test pulse measures transistor 
collector voltage. Fault appears if 
•  braking resistor is broken 
•  braking chopper is broken 
•  braking resistor is not installed 
Reset: switch power off and restart after the lamps of 
display are off. 
Check: 
•  braking resistor and insulation resistance 
•  measure braking transistor IGBT and free wheeling 
diodes 
•  If resistor is OK, then the chopper is broken 
•  Contact authorized
service 
  X 
F 13  Inverter 
undertemperatu
re 
Temperature of heat sink is below 
acceptable operating level (-10°C /14°F) 
Check 
•  ambient temperature 
•  cubicle heating 
X
F 14  Inverter 
overtemperatur
e 
Temperature of heat sink is over acceptable 
operating level 
+90°C (194°F). 
Overtemperature warning is issued when the 
heat sink temperature exceeds +85°C (185°F) 
Check: 
•  ambient temperature 
•  inverter cooling fan operation 
•  cooling air flow through heat sink 
•  heat sink is not dusty 
X
F 22 
F 23 
EEPROM 
checksum fault
Parameter save error 
•  interference fault 
•  component failure (control unit)  
After power off the inverter will automatically reset 
parameter settings. The drive does not work properly nor 
enable driving after this fault. 
Check: 
•  all parameter settings. 
•  +24V voltage output loading 
•  If the fault comes again, contact authorized
service 
center. 
  X 
F 24  Changed data 
warning 
Changes may have occurred in the different 
counter data due to mains interruption 
No special actions required. Take a critical attitude to the 
counter data. 
  X 
F 25  Microprocessor 
watchdog-fault 
•  interference fault 
•  component failure (control unit) 
Reset: switch power off and restart after the lamps of 
display are off. 
If the fault comes again, contact service. 
  X 
F 26  Power Unit 
Fault 
      X
F 31  IGBT 
temperature 
Too high temperature in IGBT. A hardware 
temperature measurement has tripped. 
Reset: switch power off and restart after the lamps of 
keypad are off. Check: 
•  motor loading 
•  brake operation 
•  inverter heatsink 
•  inverter cooling fan operation 
•  environment temperature 
  X 
F 32  Fan cooling 
fault 
Cooling fan of the frequency converter do 
not work, when ON command has been 
given 
If the fault comes again, contact authorized
service.    X 
F 35  Application 
fault 
Run-time exception in the application 
program 
Contact authorized service.    X 
F 36  Control Unit  Faulty Control Unit.   Contact authorized service.    X 
F 37  Device changed
Option board changed.  Reset the fault  X
F 38  Device added  Option board added.  Reset the fault  X
F 39  Device 
removed 
Option board removed.  Reset the fault  X
F 40  Device 
unknown 
Unknown option board or drive.  Check board and drive type.    X 
F 41  IGBT 
tempetature 
Too high temperature in IGBT transistors. 
•  long duration overload 
•  lowered cooling 
•  high environment temperature 
Reset: switch power off and restart after the lamps of 
keypad are off. Check: 
•  motor parameters 
•  u/f curve settings 
•  motor loading 
•  brake operation 
•  inverter heatsink 
•  inverter cooling fan operation 
•  environment temperature 
  X 
F43  Encoder failure
Encoder failure. 
Subcodes: 
•  S1 = EA+/- is missing 
•  S2 = EB+/- is missing 
Check: 
•  Encoder cabling 
•  Brake opening 
•  Encoder mechanical assembly 
  X 










