List of Warnings and Alarms

The table below lists the different warnings and alarms for the VLT frequency converter and indicates whether the fault locks the converter. After a Trip lock, the mains supply must be cut off, and the fault must be corrected. Reconnect the mains supply and reset the VLT frequency converter before resuming operation. A Trip can be reset manually in three ways:

+ Via the control key [RESET]
+ Via a digital input
+ Via serial communication

Additionally, an automatic reset may be selected in parameter 400 (Reset function).

A cross placed under both Warning and Alarm indicates that a warning may precede the alarm. It can also mean that it is possible to program whether a given fault results in a warning or an alarm, such as in parameter 117 (Motor thermal protection). After a trip, the motor will coast, and both the alarm and warning will flash on the VLT frequency converter. If the fault is removed, only the alarm will flash. After a reset, the VLT frequency converter will be ready to start operation again.

ALARM 22: Auto-optimisation Not OK (AMA FAULT)

    A fault has been found during automatic motor adaptation (AMA). The display will show a fault message.
    Notes: AMA can only be carried out if there are no alarms during tuning. If parameter 103 or 105 has a wrong setting, correct the setting and start AMA all over. If the motor is too small for AMA to be carried out (parameter 105 must be higher than 35% of the rated output current of the VLT frequency converter), then AMA cannot be enabled.

SYMMETRICAL IMPEDANCE [2]

    AMA has detected an asymmetrical impedance in the motor connected to the system, indicating that the motor could be defective.

MOTOR TOO BIG [3]

    The motor connected to the system is too big for AMA to be carried out. The setting in parameter 102 does not match the motor used.

MOTOR TOO SMALL [4]

    The motor connected to the system is too small for AMA to be carried out. The setting in parameter 102 does not match the motor used.

TIME OUT [5]

    AMA fails because of noisy measuring signals. Try to start AMA multiple times until it is successfully carried out. Note that repeated AMA runs may heat the motor to a level where the stator resistance (R S) is increased, but this is usually not critical.

INTERRUPTED BY USER [6]

    AMA has been interrupted by the user.

INTERNAL FAULT [7]

    An internal fault has occurred in the VLT frequency converter. Contact your Danfoss supplier for assistance.

LIMIT VALUE FAULT [8]

    The parameter values found for the motor are outside the acceptable range within which the VLT frequency converter can operate.

MOTOR ROTATES [9]

    The motor shaft rotates during the AMA process. Ensure that the load is not causing the motor shaft to rotate, then start AMA again.


ALARM 29: Heat Sink Temperature Too High (HEAT SINK OVER TEMP.)
    If the enclosure is IP 00, IP 20, or NEMA 1, the cut-out temperature of the heat sink is 90°C. If IP 54 is used, the cut-out temperature is 80°C. The tolerance is ± 5°C. The temperature fault cannot be reset until the temperature of the heat sink is below 60°C.
    Possible causes include ambient temperature being too high, too long motor cable, or too high switching frequency.

ALARM 30: Motor Phase U Missing (MISSING MOT.PHASE U)
    Motor phase U between the VLT frequency converter and motor is missing.
    Action: Turn off the VLT frequency converter and check motor phase U.

ALARM 31: Motor Phase V Missing (MISSING MOT.PHASE V)

    Motor phase V between the VLT frequency converter and motor is missing.
    Action: Turn off the VLT frequency converter and check motor phase V.

ALARM 32: Motor Phase W Missing (MISSING MOT.PHASE W)

    Motor phase W between the VLT frequency converter and motor is missing.
    Action: Turn off the VLT frequency converter and check motor phase W.

WARNING/ALARM 34: HPFB Communication Fault (HPFB COMM. FAULT)

    The serial communication on the communication option card is not working.

ALARM 37: Inverter Fault (GATE DRIVE FAULT)

    IGBT or the power card is defective.
    Action: Contact your Danfoss supplier.

Auto-optimisation Warnings 39-42

    Automatic motor adaptation has stopped because some parameters have probably been set wrongly, or the motor used is too big/small for AMA to be carried out. A choice must be made by pressing [CHANGE DATA] and choosing 'Continue' + [OK] or 'Stop' + [OK]. If parameters need to be changed, select 'Stop'; start up AMA all over.

WARNING 39: Check Parameters 104, 106 (CHECK PAR. 104, 106)
    Parameters 104 (Motor frequency f M,N) or 106 (Rated motor speed n M,N) have probably not been set correctly. Check the setting and select 'Continue' or [STOP].

WARNING 40: Check Parameters 103, 105 (CHECK PAR. 103, 105)
    Parameter 103 (Motor voltage, UM,N) or 105 (Motor current, I M,N) has not been set correctly. Correct the setting and restart AMA.

WARNING 41: Motor Too Big (MOTOR TOO BIG)
    The motor used is probably too big for AMA to be carried out. The setting in parameter 102 (Motor power, P M,N) may not match the motor. Check the motor and choose 'Continue' or [STOP].

WARNING 42: Motor Too Small (MOTOR TOO SMALL)
    The motor used is probably too small for AMA to be carried out. The setting in parameter 102 (Motor power, P M,N) may not match the motor. Check the motor and select 'Continue' or [STOP].

ALARM 60: Safety Stop (EXTERNAL FAULT)
    Terminal 27 (parameter 304 Digital inputs) has been programmed for a Safety interlock [3] and is a logic '0'.

WARNING 61: Output Frequency Low (FOUT < FLOW)
    The output frequency is lower than parameter 223 (Warning: Low frequency, f LOW).

WARNING 62: Output Frequency High (FOUT > FHIGH)
    The output frequency is higher than parameter 224 (Warning: High frequency, f HIGH).

WARNING/ALARM 63: Output Current Low (I MOTOR < I LOW)
    The output current is lower than parameter 221 (Warning: Low current, I LOW). Select the required function in parameter 409 (Function in case of no load).

WARNING 64: Output Current High (I MOTOR > I HIGH)
    The output current is higher than parameter 222 (Warning: High current, I HIGH).

WARNING 65: Feedback Low (FEEDBACK < FDB LOW)
    The resulting feedback value is lower than parameter 227 (Warning: Low feedback, FB LOW).

WARNING 66: Feedback High (FEEDBACK > FDB HIGH)
    The resulting feedback value is higher than parameter 228 (Warning: High feedback, FB HIGH).

WARNING 67: Remote Reference Low (REF. < REF LOW)
    The remote reference is lower than parameter 225 (Warning: Low reference, REF LOW).

WARNING 68: Remote Reference High (REF. > REF HIGH)
    The remote reference is higher than parameter 226 (Warning: High reference, REF HIGH).

WARNING 69: Temperature Auto Derate (TEMP.AUTO DERATE)
    The heat sink temperature has exceeded the maximum value, and the auto derating function (parameter 411) is active.

WARNING 99: Unknown Fault (UNKNOWN ALARM)
    An unknown fault has occurred which the software is not able to handle. Contact your Danfoss supplier for assistance.

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