VLT ® 2900 Series overvoltage in the UDC can occur when the motor fre- quency is reduced too quickly due to ramp down time being too short. When the inverter is switched off a trip reset is generated. Note: Voltage warning high (warn- ing 5) will thus also be able to generate an alarm 7. WARNING/ALARM 13: Overcurrent The inverter's peak current limit (approx. 200% of rated output current) has been exceeded. The warning will last approx. 1-2 sec, and the frequency converter will then trip and emit an alarm. Switch off the frequency converter and check whether the motor shaft can be turned, and whether the size of the motor is suitable for the frequency converter. WARNING/ALARM 8:
Undervoltage If the intermediate circuit voltage (UDC) is lower than the inverter's Undervoltage limit the inverter will be switched off until the UDC once more goes above the undervoltage limit. If the UDC remains under the un- dervoltage limit , the inverter will trip after a set time. The time depends on the device, and is set at 2 - 15 sec. An undervoltage can occur when the connected mains voltage is too low. Check whether the supply voltage is suitable for the frequency converter, see Technical data . When the frequency converter is switched off a alarm 8 (and alarm 6) is displayed briefly and a trip reset is generated. Note:
Voltage warning low (warning 6) will thus also be able to generate an alarm 8. ALARM 14: 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. Turn off the frequency converter and remove the earth fault. ALARM 15: Switch mode fault Fault in switch mode power supply (internal supply). Contact your Danfoss supplier. ALARM: 16: Short-circuit There is a short-circuit on the motor terminals or in the motor. Disconnect the mains supply to the frequency converter and remove the short-circuit. WARNING/ALARM 9:
Inverter overload Electronic thermal inverter protection indicates that the frequency converter is close to tripping due to over- loading (output current too high for too long). The counter for electronic thermal inverter protection gives a warning at 98% and trips at 100% accompanied by an alarm. The frequency converter cannot be reset until the counter drops below 90%. This fault arises because the frequency converter has been overloa- ded for too long. WARNING/ALARM 17: Serial communication time- out There is no serial communication to the frequency converter. The warning will only be active when 514 Bus timeout function is set to a value other than OFF.
If parameter 514 Bus timeout function is set to Stop and trip [5], it will first give a warning and then ramp down and trip out accompanied by an alarm. Param- eter 513 Bus timeout can if required be increased. WARNING/ALARM 10: Motor overloaded According to the electronic thermal inverter protection the motor is too hot. In parameter 128 the user can select whether the frequency converter should emit a warning or an alarm when the counter reaches 100%. This fault is due to the motor being overloaded by more than 100% for too long. Check that motor parameters 102-106 are set correctly. WARNING/ALARM 18:
HPFB bus timeout There is no serial communication to the frequency converter's communication option card. This warning will only be active when parameter 804 Bus timeout function is set to a value other than OFF. If parameter 804 Bus timeout function is set to Stop and trip , it will first give a warning and then ramp down and trip out accompanied by an alarm. Parameter 803 Bus time- out can if required be increased. WARNING/ALARM 11: Motor thermistor The motor is too hot or the thermistor/thermistor con- nection has been disconnected. In parameter 128 Thermal motor protection the user can select whether the frequency transformer emits a warning or an alarm.
Check that the PTC thermistor is correctly connected between terminals 18, 19, 27 or 29 (digital input) and terminal 50 (+ 10 V supply). WARNING 33: Out of frequency range This warning is active if the output frequency has reached Output frequency low limit (parameter 201) or Output frequency high limit (parameter 202). If the fre- quency converter is in Process regulation, closed loop (parameter 100) the warning will be active in the dis- play. If the frequency converter is in another mode than Process regulation, closed loop , bit 008000 Out of fre- quency range in extended status word will be active, but there will not be a warning in the display. All about VLT 2900 WARNING/ALARM 12:
Current limit The output current is greater than the value in param- eter 221 Current Limit LIM , and the frequency converter will trip after a set time, selected in parameter 409 Trip delay overcurrent . MG.29.A3.02 - VLT ® is a registered Danfoss trademark 73