Danfoss VLT AQUA Drive FC 202 Design Manual

Also see for VLT AQUA Drive FC 202: Service guide Installation guide Installation guide Operating guide Installation guide

Contents

Troubleshooting• Check connections on the serial communicationcable.• Increase 8-03 Control Timeout Time• Check the operation of the communicationequipment.• Verify a proper installation based on EMCrequirements.ALARM 18, Start failedThe speed has not exceeded 1-77 Compressor Start MaxSpeed [RPM] during start within the allowed time. (set in1-79 Pump Start Max Time to Trip). This may be caused by ablocked motor.WARNING 23, Internal fan faultThe fan warning function is an extra protective functionthat checks if the fan is running/mounted. The fan warningcan be disabled in 14-53 Fan Monitor ([0] Disabled).For the D, E, and F Frame units, the regulated voltage tothe fans is monitored.Troubleshooting• Check for proper fan operation.• Cycle power to the frequency converter andcheck that the fan operates briefly at start up.• Check the sensors on the heatsink and controlcard.WARNING 24, External fan faultThe fan warning function is an extra protective functionthat checks if the fan is running/mounted. The fan warningcan be disabled in 14-53 Fan Monitor ([0] Disabled).Troubleshooting• Check for proper fan operation.• Cycle power to the frequency converter andcheck that the fan operates briefly at start up.• Check the sensors on the heatsink and controlcard.WARNING 25, Brake resistor short circuitThe brake resistor is monitored during operation. If a shortcircuit occurs, the brake function is disabled and thewarning appears. The frequency converter is stilloperational but without the brake function. Remove powerto the frequency converter and replace the brake resistor(see 2-15 Brake Check).WARNING/ALARM 26, Brake resistor power limitThe power transmitted to the brake resistor is calculated asa mean value over the last 120 s of run time. Thecalculation is based on the intermediate circuit voltage andthe brake resistance value set in 2-16 AC brake Max.Current. The warning is active when the dissipated brakingis higher than 90% of the brake resistance power. If [2] Tripis selected in 2-13 Brake Power Monitoring, the frequencyconverter trips when the dissipated braking power reaches100%.WARNING/ALARM 27, Brake chopper faultThe brake transistor is monitored during operation and if ashort circuit occurs, the brake function is disabled and awarning is issued. The frequency converter is stilloperational but, since the brake transistor has short-circuited, substantial power is transmitted to the brakeresistor, even if it is inactive.Remove power to the frequency converter and remove thebrake resistor.WARNING/ALARM 28, Brake check failedThe brake resistor is not connected or not working.Check 2-15 Brake Check.ALARM 29, Heat Sink tempThe maximum temperature of the heatsink has beenexceeded. The temperature fault does not reset until thetemperature falls below a defined heatsink temperature.The trip and reset points are different based on thefrequency converter power size.TroubleshootingCheck for the following conditions.• Ambient temperature too high.• Motor cable too long.• Incorrect airflow clearance above and below thefrequency converter.• Blocked airflow around the frequency converter.• Damaged heatsink fan.• Dirty heatsink.ALARM 30, Motor phase U missingMotor phase U between the frequency converter and themotor is missing.Remove power from the frequency converter and checkmotor phase U.ALARM 31, Motor phase V missingMotor phase V between the frequency converter and themotor is missing.Remove power from the frequency converter and checkmotor phase V.ALARM 32, Motor phase W missingMotor phase W between the frequency converter and themotor is missing.Remove power from the frequency converter and checkmotor phase W.ALARM 33, Inrush faultToo many power-ups have occurred within a short timeperiod. Let the unit cool to operating temperature.WARNING/ALARM 34, Fieldbus communication faultThe fieldbus on the communication option card is notworking.General Specifications and ... Design Guide198 Danfoss A/S © Rev. 06/2014 All rights reserved. MG20Z20288