Danfoss PTU 025 User Manual

•
•
•
•
•
•
•
•
•
•
9.4.85 WARNING/ALARM 104, Mixing Fan Fault
Cause
The fan is not operating. The fan monitor checks that the fan is spinning at power-up or whenever the mixing fan is turned on. The
mixing fan fault can be configured as a warning or an alarm in parameter 14-53 Fan Monitor.
Troubleshooting
Cycle power to the drive to determine if the warning/alarm returns.
9.4.86 WARNING/ALARM 122, Mot. Rotat. Unexp.
Cause
The drive performs a function that requires the motor to be at standstill, for example DC hold for PM motors.
9.4.87 WARNING 163, ATEX ETR Cur.Lim.Warning
Cause
The drive has run above the characteristic curve for more than 50 s. The warning is activated at 83% and deactivated at 65% of the
allowed thermal overload.
9.4.88 ALARM 164, ATEX ETR Cur.Lim.Alarm
Cause
Running above the characteristic curve for more than 60 s within a period of 600 s activates the alarm, and the drive trips.
9.4.89 WARNING 165, ATEX ETR Freq.Lim.Warning
Cause
The drive has run for more than 50 s below the allowed minimum frequency (parameter 1-98 ATEX ETR Interpol. Points Freq.).
9.4.90 ALARM 166, ATEX ETR Freq.Lim.Alarm
Cause
The drive has run for more than 60 s (in a period of 600 s) below the allowed minimum frequency (parameter 1-98 ATEX ETR Interpol.
Points. Freq.).
9.4.91 ALARM 244, Heat Sink Temperature
Cause
The maximum temperature of the heat sink has been exceeded. The temperature fault cannot reset until the temperature drops
below the defined heat sink temperature. The trip and reset points are different based on the power size. This alarm is equivalent to
Alarm 29, Heat Sink Temp.
Troubleshooting
Check for the following:
Ambient temperature too high.
Motor cables too long.
Incorrect airflow clearance above or below the AC drive.
Blocked airflow around the unit.
Damaged heat sink fan.
Dirty heat sink.
9.4.92 WARNING 251, New Typecode
Cause
The power card or other components have been replaced, and the typecode has changed.
9.4.93 ALARM 421, Temperature Fault
Cause
A fault caused by the on-board temperature sensor is detected on the fan power card.
Troubleshooting
Check wiring.
Check the on-board temperature sensor.
Replace fan power card.
AQ262141314214en-000301 / 130R0880150 | Danfoss A/S © 2021.11
Maintenance, Diagnostics, and
Troubleshooting
VLT® HVAC Drive FC 102
Operating Guide

Danfoss PTU 025 Specifications

General

Brand	Danfoss
Model	PTU 025
Category	DC Drives
Language	English