5 Error messages
5.3 Fault list
DC1 Variable Frequency Drive 04/16 MN04020003Z-EN www.eaton.com 127
5.3 Fault list
The following table shows the failure codes, the possible causes and
indicates corrective measures.
Table 20: Error messages list
Message
Error no.
[dec]
Possible causes and fixes
STOP – Ready to start. There is no drive enable signal present. There are no error messages present.
OI-b
01 Excessively high braking current
• Check the brake resistor and its wiring for short-circuits and ground faults.
• Make sure that the braking resistance value is not lower than the minimum permissible braking
resistance.
OL-br
02 Thermal overload on brake resistor
The drive has been switched off in order to prevent the brake resistor from being thermally
destroyed.
• Make the P1-04 and P2-25 ramp times longer in order to have less frequent braking.
• Reduce the load’s inertia, if possible.
O-I
03 Overcurrent at variable frequency drive output
Occurs right after switching on the unit:
• Check the cable connection between inverter and motor.
• Check the motor for shorted turns and ground faults.
Occurs when starting the motor:
• Check whether the motor can rotate freely and make sure that it is not being blocked
mechanically.
• Motor with mechanical brake: Check whether the brake is being applied.
• Check the connection configuration (star/delta).
• Check to make sure that the motor data was entered correctly in P1-07, P1-08, and P1-09.
• In vector control mode (P4-01 = 0 or 1): Check to make sure that the cos ϕ (P4-05) value was
entered correctly and that a motor identification run was performed correctly.
• Increase the acceleration ramp time (t-acc, P1-03) if necessary.
• In speed control mode (P4-01 = 2): Reduce the voltage boost with P1-11.
Occurs during operation at a constant speed:
• Check whether the motor is overloaded.
Occurs during acceleration/deceleration:
• The ramp times are too short and require too much power.If P-03 / P-04 cannot be increased,
a larger device may be required.
I.t-trP
04 Motor overload. The thermal protection mechanism has tripped as a result of the device being run
above the rated motor current set with P1-08 longer than a specific time.
• Check to make sure that the motor data was entered correctly in P1-07, P1-08, and P1-09.
• In vector control mode (P4-01 = 0 or 1): Check to make sure that the cos ϕ (P4-05) value was
entered correctly and that a motor identification run was performed correctly.
• Check the motor’s connection configuration (e.g., start/delta)
• If the decimal points on the display flash during operation, this means that the unit is being run
in its overload range (> P1-08).In this case, use P1-03 to make the acceleration ramp longer or
reduce the load.
• Make sure that the motor is not being mechanically blocked and that there are no additional
loads on the motor.
PS-trp
05 Overcurrent (Hardware)
• Check the wiring to the motor and the motor itself for short-circuits and ground faults.
• Disconnect the motor cable from the variable frequency drive and switch the variable frequency
drive back on. If the error message still appears, the device needs to be replaced. Before
commissioning the new device, check the system for short-circuits or ground faults that could
have caused the device to fail.
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