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.

WARNING 1: Under 10 V (10 VOLT LOW)
    The 10 V voltage from terminal 50 on the control card is below 10 V.
    Action: Remove some of the load from terminal 50, as the 10 Volts supply is overloaded. The maximum load is 17 mA/min, with a minimum resistance of 590 Ω.

WARNING/ALARM 2: Live Zero Fault (LIVE ZERO ERROR)
    The current or voltage signal on terminal 53, 54, or 60 is below 50% of the value preset in parameters 309, 312, and 315 (Terminal, min. scaling).
    Action: Check the signal on the specified terminals and adjust the settings or connections as needed.

WARNING/ALARM 4: Mains Imbalance (MAINS IMBALANCE)
    There is a high imbalance or a phase missing on the supply side.
    Action: Check the supply voltage to the VLT frequency converter. Refer to the table in the manual for alarm/warning limits based on the model of the VLT 6000 HVAC.

WARNING 5: Voltage Warning High (DC LINK VOLTAGE HIGH)
    The intermediate circuit voltage (DC) is higher than the Voltage warning high limit. The controls of the VLT frequency converter are still enabled.
    Action: Monitor the voltage and take corrective actions if it continues to rise above the acceptable range.

WARNING 6: Voltage Warning Low (DC LINK VOLTAGE LOW)
    The intermediate circuit voltage (DC) is lower than the Voltage warning low limit. The controls of the VLT frequency converter are still enabled.
    Action: Monitor the voltage and take corrective actions if it continues to drop below the acceptable range.

WARNING/ALARM 7: Overvoltage (DC LINK OVERVOLT)
    If the intermediate circuit voltage (DC) is higher than the Overvoltage limit of the inverter, the VLT frequency converter will trip after a fixed period. The length of this period depends on the unit.
    Action: Check the intermediate circuit voltage and reduce it if necessary to prevent tripping.

For alarms, the current alarm number will be shown on the display, along with an explanation of the issue.

WARNING/ALARM 8: Undervoltage (DC LINK UNDERVOLT)
    If the intermediate circuit voltage (DC) drops below the undervoltage limit of the inverter, the VLT frequency converter will trip after a fixed period, depending on the unit.
    Action: Check whether the supply voltage matches the VLT frequency converter specifications in the Technical data.

WARNING/ALARM 9: Inverter Overload (INVERTER TIME)
    The electronic thermal inverter protection reports that the frequency converter is about to cut out due to an overload (too high current for too long). The counter for electronic thermal inverter protection gives a warning at 98% and trips at 100%, while giving an alarm. The VLT frequency converter cannot be reset until the counter is below 90%.
    Action: Check that the VLT frequency converter is not overloaded by more than 100% for too long.

WARNING/ALARM 10: Motor Overtemperature (MOTOR TIME)
    According to the electronic thermal protection (ETR), the motor is too hot. Parameter 117 (Motor thermal protection) allows a choice of whether the VLT frequency converter is to give a warning or an alarm when the Motor thermal projection reaches 100%.
    Action: Check that the motor parameters 102-106 have been set correctly.

WARNING/ALARM 11: Motor Thermistor (MOTOR THERMISTOR)
    The thermistor or the thermistor connection has been disconnected. Parameter 117 (Motor thermal protection) allows a choice of whether the VLT frequency converter is to give a warning or an alarm.
    Action: Check that the thermistor has been correctly connected between terminal 53 or 54 (analogue voltage input) and terminal 50 (+10 V supply).

WARNING/ALARM 12: Current Limit (CURRENT LIMIT)
    The current is higher than the value in parameter 215 (Current limit ILIM), and the VLT frequency converter trips after the time set in parameter 412 (Trip delay overcurrent, I LIM) has passed.

WARNING/ALARM 13: Overcurrent (OVERCURRENT)
    The inverter peak current limit (approximately 200% of the rated current) has been exceeded. The warning will last approximately 1-2 seconds, following which the VLT frequency converter will trip and give off an alarm.
    Action: Turn off the VLT frequency converter and check whether the motor shaft can be turned and whether the motor size matches the VLT frequency converter.

ALARM 14: Earth Fault (EARTH FAULT)
    There is a discharge from the output phases to earth, either in the cable between the frequency converter and the motor or in the motor itself.
    Action: Turn off the VLT frequency converter and remove the earth fault.

ALARM 15: Switch Mode Fault (SWITCH MODE FAULT)
    Fault in the switch mode power supply (internal ±15 V supply).
    Action: Contact your Danfoss supplier.

ALARM 16: Short-circuiting (CURR. SHORT CIRCUIT)
    There is short-circuiting on the motor terminals or in the motor itself.
    Action: Cut off the mains supply to the VLT frequency converter and remove the short-circuit.

WARNING/ALARM 17: Serial Communication Timeout (STD BUSTIMEOUT)
    There is no serial communication with the VLT frequency converter. This warning will only be enabled if parameter 556 (Bus time interval function) has been set to a value different from OFF.
    Action: If parameter 556 (Bus time interval function) has been set to Stop and trip [5], the VLT frequency converter will first give off an alarm, then ramp down and finally trip while giving off an alarm. It is possible to increase parameter 555 (Bus time interval).

WARNING/ALARM 18: HPFB Bus Timeout (HPFB TIMEOUT)
    There is no serial communication with the communication option card of the VLT frequency converter. This warning will only be enabled if parameter 804 (Bus time interval function) has been set to anything but OFF.
    Action: If parameter 804 (Bus time interval function) has been set to Stop and trip, the VLT frequency converter will first give off an alarm, then ramp down and finally trip while giving off an alarm. Parameter 803 (Bus time interval) could possibly be increased.

WARNING 19: Fault in the EEprom on the Power Card (EE ERROR POWER)
    There is a fault on the power card EEPROM. The VLT frequency converter will continue to function but is likely to fail at the next power-up.
    Action: Contact your Danfoss supplier.

WARNING 20: Fault in the EEprom on the Control Card (EE ERROR CONTROL)
    There is a fault in the EEPROM on the control card. The VLT frequency converter will continue to function but is likely to fail at the next power-up.
    Action: Contact your Danfoss supplier.

------+

+ Danfoss VLT6000 User Manuals >>

+ Danfoss VLT6000 Fault Codes >>

+ Danfoss VLT6000 Fault Codes 2 >>

+ Danfoss VLT6000 Fault Codes 3 >>

+ Danfoss Main Page (2) >>

+ VFD Home page >>  

-