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6.
Troubleshooting
6.1 Fault-finding chart
Symptom
Overload or over-current trip
on unloaded motor during
acceleration
Overload or over-current –
motor does not spin
Drive will not enable –
display remains on 'StoP'
Drive runs incorrectly when
in vector mode
In very cold ambient
conditions, drive will not
power up
Speed limit or rated
frequency parameters
cannot be set above 250Hz,
500Hz or 1000Hz
Extended menus cannot be
accessed
6.2 Fault messages
Trip message
Explanation
P-dEF
Default parameters loaded, usually after pressing STOP, UP & DOWN keys for 1s. Press
STOP to reset the trip. Display then reads "StoP"
"O-I"
Over-current on drive output to motor.
"h O-I"
Trip on drive enable : check for wiring error or short circuit
Trip on motor starting : check for stalled or jammed motor
Trip during operation : check for sudden overload or malfunction
If "h O-I" occurs, check for short circuit on output. If wiring correct, contact your supplier.
"I.t-trP"
Drive overload trip, occurring when the drive has been delivering >100% rated current (set in
P1-08) for a period of time. The display flashes to indicate an overload condition.
"O-Uolt"
Over-voltage on DC bus. Check supply voltage is within limits. If trip occurs on deceleration,
increase deceleration time or fit braking resistor.
"U-Uolt"
Under-voltage trip. Happens routinely when drive powered down. If it occurs whilst running,
check supply voltage
"OI-b"
Over current in the brake resistor circuit. Check cabling to brake resistor
"OL-br"
Brake resistor overload. Increase deceleration time, reduce load inertia or add further brake
resistors in parallel. Min resistance values from ratings tables in section 7.4 must be observed.
"O-t"
Over-temperature trip. Check drive cooling and possible enclosure dimensions
"U-t"
Under-temperature trip. Trip occurs if ambient is less than 0
must be raised above zero in order to start the drive.
"th-Flt"
Thermistor hardware fault. Contact your local distributor for further information.
"PS-trP"
Trip on drive enable : check for wiring error or short circuit
Trip during operation : check for sudden overload or over-temperature
"dAtA-F"
Occurs routinely after Flash upgrade. Reset using the STOP button or after a power down
cycle. All parameters set to default after an upgrade.
"P-LOSS"
Drive intended for use with a 3-phase supply has lost one phase. Condition must persist for
>15s before a trip occurs. Phase loss detection disabled if parameters defaulted (P-dEF)
when L3 has been removed.
"Ph-Ib"
Phase imbalance. Trips if the phase imbalance exceeds 3%. Condition must persist for >30s
before a trip occurs.
"SC-trP"
Check integrity of OptiLink (communication link) between drives interconnected optically.
Check that each drive in a network has a unique drive address (P2-27)
If Modbus function enabled, check Modbus communication link.
"E-triP"
External trip (connected to digital input 3). Check motor thermistor (if connected)
"At-Fxx"
Auto-tune failed to complete successfully. (xx = 01...07) See 6.3 for more details.
"SPIN-F"
Spin start function failed to detect the motor speed. Check cable connection between drive
and motor. Make sure that the motor actual speed is less than the maximum speed limit
(P1-01). Make sure that the motor base frequency (P1-09) is less than 100Hz.
Cause and Solution
Check Star / Delta terminal connection in motor. Rated operating voltage of
drive and motor should match. The Delta connection always gives the lower
voltage rating of a dual voltage motor
Check for locked rotor. Check that the mechanical brake is released (if fitted)
Check that the hardware enable signal is applied to digital input 1. Ensure that
the User +24V output voltage (between terminals 5 and 7) is correct. If not,
check wiring to user terminal strip. Check P1-12 for terminal / keypad mode. If
keypad mode selected, press the START button. Check that supply voltage is
within specification.
Ensure that the motor name plate data has been entered into P1-07, P1-08,
P1-09 before the parameter auto-tune function has been carried out. Set P4-02
= 1 to carry out auto-tune.
If the ambient temperature is less than -10
Ensure that a local heating source keeps the ambient above 0
conditions.
The maximum output motor frequency is limited by the switching frequency.
Ensure that P2-24 is at least 16x greater than the required motor output
frequency before setting the required maximum or rated output frequency
parameters.
Ensure that P1-14 is set to the extended access code. This is "101" unless the
code in P2-37 has been changed by the user.
O
C, the drive may not power up.
O
C in these
o
C. Drive ambient temperature
19
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Table of Contents
Troubleshooting
