5 Fault messages
5.1 Introduction
138 DA1 Variable Frequency Drives 11/16 MN04020005Z-EN www.eaton.com
5.1.3 Fault list
The following table lists the failure codes, the possible causes and indicates
corrective measures.
Table 22: Fault messages list
Message
Error no.
[dec]
Possible causes and fixes
STOP – Ready to start. There is no drive enable signal present. There are no fault
messages present.
no-F
(t 00 Shown for P0-13 if there are no messages in the error register.
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.
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