Danfoss VLT HVAC Basic Drive FC 100 Series Programming Manual page 98

Troubleshooting
Troubleshooting:
Check fan resistance.
ALARM 30, Motor phase U missing
Motor phase U between the adjustable frequency drive
and the motor is missing.
4 4
Turn off the adjustable frequency drive and check motor
phase U.
ALARM 31, Motor phase V missing
Motor phase V between the adjustable frequency drive
and the motor is missing.
Turn off the adjustable frequency drive and check motor
phase V.
ALARM 32, Motor phase W missing
Motor phase W between the adjustable frequency drive
and the motor is missing.
Turn off the adjustable frequency drive and check motor
phase W.
ALARM 38, Internal fault
It may be necessary to contact your Danfoss supplier.
ALARM 44, Earth fault II
There is a discharge from the output phases to ground,
either in the cable between the adjustable frequency drive
and the motor or in the motor itself.
Troubleshooting
Turn off the adjustable frequency drive and
remove the ground fault.
Measure the resistance to ground of the motor
leads and the motor with a megohmmeter to
check for ground fault in the motor.
WARNING 47, Control Voltage Fault
The 24 V DC is measured on the control card. The external
24 V DC backup power supply may be overloaded,
otherwise contact your Danfoss supplier.
WARNING 48, VDD1 Supply Low
The VDD1 supply on the control card is outside of
allowable limits.
ALARM 51, AMA check Unom and Inom
The setting of motor voltage, motor current, and motor
power is presumably wrong. Check the settings.
ALARM 52, AMA low Inom
The motor current is too low. Check the settings.
ALARM 53, AMA motor too big
The motor is too big for the AMA to be carried out.
4-6
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VLT HVAC Basic Drive Programming Guide
ALARM 54, AMA motor too small
The motor is too small for the AMA to be carried out.
ALARM 55, AMA Parameter out of range
The parameter values found from the motor are outside
acceptable range.
ALARM 56, AMA interrupted by user
The AMA has been interrupted by the user.
ALARM 57, AMA timeout
Try to start the AMA again a number of times, until the
AMA is carried out. Please note that repeated runs may
heat the motor to a level where the resistances Rs and Rr
are increased. In most cases, however, this is not critical.
ALARM 58, AMA internal fault
Contact your Danfoss supplier.
WARNING 59, Current limit
The current is higher than the value in 4-18 Current Limit.
ALARM 60, Ext. Interlock
External interlock has been activated. To resume normal
operation, apply 24 V DC to the terminal programmed for
external interlock and reset the adjustable frequency drive
(via serial communication, digital I/O, or by pressing
[Reset]).
WARNING 66, Heatsink temperature low
This warning is based on the temperature sensor in the
IGBT module.
Troubleshooting:
The heatsink temperature measured as 32° F [0°C] could
indicate that the temperature sensor is defective causing
the fan speed to increase to the maximum. If the sensor
wire between the IGBT and the gate drive card is discon-
nected, this warning would result. Also, check the IGBT
thermal sensor.
ALARM 70, Illegal power section configuration
The control card and power card are incompatible. Contact
your supplier with the type code of the unit from the
nameplate and the part numbers of the cards to check
compatibility.
ALARM 80, Drive initialized to default value
Parameter settings are initialized to default settings after a
manual reset.
ALARM 95, Broken belt
Torque is below the torque level set for no load, indicating
a broken belt. See parameter group 22-6*.
ALARM 126, Motor Rotating
High back emf voltage. Please stop the rotor of the PM
motor.
WARNING 200, Fire Mode
Fire Mode has been activated.
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MG18B222 - VLT is a registered Danfoss trademark