5 Error Messages
5.3 Fault list
DC1…20… and DC1…OE1 Variable Frequency Drives
02/20 MN040059EN
www.eaton.com
139
5.3 Fault list
The following table shows the failure codes, the possible causes and
indicates corrective measures.
Table 31: Error messages list
Message
Error no.
[dez]
Possible causes and fixes
Stop
–
Ready to start. There is no drive enable signal present. There are no fault
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. This message will
only be output if P-34 = 1 (“braking chopper”)
• Make the P-04 and P-24 ramp times longer in order to have less frequent
braking.
• Reduce the load’s inertia (if possible).
If the protection achieved with P-34 = 1 is not adequate for the brake resistor
being used:
• Provide external protection for the brake resistor and set P-34 to a value of 2.
O-I
03
Overcurrent at variable frequency drive output
Occurs right after switching on the unit:
• Check the cable connection between the variable frequency drive and the
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 correct rated motor current has been entered in
P-08
• Increase the acceleration ramp time (t-acc, P-03) if necessary.
• Reduce the voltage boost with P-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 P-08 longer than a
specific time.
• Check to make sure that the rated motor current has been entered in P-08.
• 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 (> P-08). In this case, use P-03 to
make the acceleration ramp longer or reduce the load.
• Check whether the motor is being blocked mechanically or whether there are
any additional loads.
