Installation manual

Diagnostics and troubleshooting
152 S1A53838 09/2011
OH
[Drive
overtemperature]
• The drive cooling fan is not working.
• The ambient temperature is too high.
• An enclosure air vent is blocked.
• A heat source is too close to the drive.
• The drive heatsink temperature sensor is
malfunctioning.
• Restart operation by resetting the drive
detected fault after cool-off.
• Decrease the ambient temperature by
increasing the free space around the drive
and removing any heat generating source
from the proximity of the drive.
• Check the fan operation
OH2
[PTC overheating]
• The external PTC embedded in the motor
windings indicates a motor overtemperature
condition.
• Correct the motor overload condition.
• Check the PTC for correct operation.
OL1
[Drive overload]
• The acceleration time is too short.
• The DC injection current level is too high.
• The setting of parameter [Mot cont. mode
sel.] (Pt) is incorrect.
• The drive is starting into a rotating load.
• The load is too large.
• Increase the acceleration time parameters
(ACC or F500).
• Reduce the setting of parameters F251
and/or F252.
• Select the correct setting for parameter [Mot
cont. mode sel.] (Pt).
• Enable catch on the fly, parameter F301.
• Set parameter F302 to 2.
• Use a drive with a higher power rating.
OL2
[Motor overload]
• The setting of parameter [Mot cont. mode
sel.] (Pt) is incorrect.
• The motor is jammed.
• Low-speed operation is performed
continuously
• Excessive load is applied to the motor.
• Select the correct setting for parameter [Mot
cont. mode sel.] (Pt).
• Check the load.
• Adjust parameter OLM to the overload level
that the motor can withstand during low
speed operation.
OP1
[Overvoltage
acceleration]
• The input voltage is fluctuating abnormally.
• Power network is greater than 200 kVA.
• Power factor capacitor switching
• SCR switching on power network
• The drive is starting into a rotating load.
• Intermittent output phase fault
• Install a line reactor.
• Enable catch on the fly, parameter F301.
• Set parameter F302 to 2.
• Determine the cause of the missing output
phase (such as a bad connection, an output
disconnect, or an open winding in the motor)
and rectify the trouble.
OP2
[Overvolt.
deceleration]
• The deceleration time is too short.
• Overhauling load
• The input voltage is fluctuating abnormally.
• Power network is greater than 200 kVA
• Power factor capacitor switching
• SCR switching on power network
• The drive is starting into a rotating load.
• Intermittent output phase fault
• Increase the deceleration time parameters
(DEC or F501).
• Enable parameter F305.
• Install a line reactor.
• Check the input and output circuits for phase
loss detection and rectify.
• Enable catch on the fly, parameter F301.
OP3
[Overvoltage cont.
speed]
• The input voltage is fluctuating abnormally.
• Power network is greater than 200 kVA
• Power factor capacitor switching
• SCR switching on power network
• The drive is regenerating - the load causes
the motor to run at a frequency higher than
drive output frequency.
• Intermittent output phase fault
• Install a line reactor.
• Check the input and output circuits for phase
loss detection and rectify.
Ot
[Overtorque]
• The calculated motor torque has reached
the level set by parameter F616.
• Adjust the settings of parameters F615
and F616 as needed.
• Verify machine operation.
SOUt
[PM motor step-out]
(permanent magnet
motor pulls out of
synchronism)
• The motor is jammed.
• Output phase loss
• Impact load
• Check the load and correct the jammed
condition.
• Check the condition of the motor and load
wiring.
UC
[Underload]
• The measured motor current has dropped
below the level set by parameter F611.
• Check parameters F610–612 for the
correct settings.
UPI
[Undervoltage]
• The input voltage is too low. • Check the input voltage and rectify the
trouble.
• Select the correct setting for parameter
F627.
• Enable catch on the fly, parameter F301.
• Set parameter F302 to 2.
Code Name Possible causes Remedies