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Error Diagnosis
5. Error Diagnosis
KEB COMBIVERT Error messages are always represented with an "E.xx"
and the appropriate error code in the display. Errors cause the immediate
turn off of the output to the motor. Restart is possible, only after reset.
Malfunctions are represented with an "A.xx" and the appropriate code.
Responses to malfunctions can vary depending on the programmed
condition.
In the following table the error codes and their causes are described.
Display Description Value Meaning
E. OP ERROR over voltage 1 Error: Overvoltage (DC-bus circuit)
Occurs, if DC-bus voltage rises above the permissible value.
Causes:
• poor control adjustment (overshooting)
• input voltage too high
• interference voltages at the input
• deceleration ramps too short
• braking resistor damaged or undersized
E. UP ERROR under voltage 2 Error: Under voltage (DC-bus circuit).
Occurs, if DC-bus voltage falls below the permissible value.
Causes:
• input voltage too low or instable
• inverter rating too small
• voltage losses through wrong cabling
• the supply voltage through generator / transformer breaks down
at very short ramps
• one phase of the input voltage is missing
(ripple-detection)
• with separate supply and switched off power circuit
E. OC ERROR over current 4 Error: Over current
Occurs, if the specified peak current is exceeded. Causes:
• acceleration ramps too short
• the load is too big at turned off acceleration stop and
turned off constant current limit
• short-circuit at the output
• ground fault
• deceleration ramp too short
• motor cable too long
• EMC
E.OHI ERROR overheat internal 6 Error: Overheating in the interior: error can only be reset once the
drive displays E.nOHI; this means the interior temperature has
fallen by at least 3°C
E.nOHI no ERROR overheat int. 7 No longer overheating in the interior E.OHI, interior temperature
has fallen by at least 3°C
E. OH ERROR overheat pow.mod. 8 Error: Overtemperature of power module. Error can only be reset
at E.nOH. Causes:
• insufficient air flow at the heat sink (soiled)
• ambient temperature too high
• fan clogged
E.dOH ERROR drive overheat 9 Error: Overtemperature signal from motor temperature sensor.
Error can only be reset at E.ndOH, when sensor resistance decre-
ases. Causes:
• resistor at the terminals T1, T2 >1650 Ohm
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