Danfoss VLT CDS 303 User Manual

WARNING 24, External fan fault
The fan warning function is an extra protective function
that checks if the fan is running/mounted. The fan warning
can be disabled in parameter 14-53 Fan Monitor ([0]
Disabled).
Troubleshooting
Check for proper fan operation.
Cycle power to the adjustable frequency drive
and check that the fan operates briey at start-
up.
Check the sensors on the heatsink and control
card.
WARNING 25, Brake resistor short circuit
The brake resistor is monitored during operation. If a short
circuit occurs, the brake function is disabled and the
warning appears. The adjustable frequency drive is still
operational but without the brake function. Remove power
to the adjustable frequency drive and replace the brake
resistor (see parameter 2-15 Brake Check).
WARNING/ALARM 26, Brake resistor power limit
The power transmitted to the brake resistor is calculated as
a mean value over the last 120 seconds of run time. The
calculation is based on the intermediate circuit voltage and
the brake resistance value set in parameter 2-16 AC Brake
Max. Current. The warning is active when the dissipated
braking energy is higher than 90% of the brake resistance
power. If [2] Trip is selected in parameter 2-13 Brake Power
Monitoring, the adjustable frequency drive trips when the
dissipated braking energy reaches 100%.
WARNING/ALARM 27, Brake chopper fault
The brake transistor is monitored during operation and if a
short circuit occurs, the brake function is disabled and a
warning is issued. The adjustable frequency drive is still
operational but, since the brake transistor has short-
circuited, substantial power is transmitted to the brake
resistor, even if it is inactive.
Remove power to the adjustable frequency drive and
remove the brake resistor.
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
Check parameter 2-15 Brake Check.
ALARM 29, Heatsink temp
The maximum temperature of the heatsink has been
exceeded. The temperature fault will not reset until the
temperature falls below a dened heatsink temperature.
The trip and reset points are dierent based on the
adjustable frequency drive power size.
Troubleshooting
Check for the following conditions.
Ambient temperature too high.
Motor cable too long.
Incorrect airow clearance above and below the
adjustable frequency drive.
Blocked airow around the adjustable frequency
drive.
Damaged heatsink fan.
Dirty heatsink.
ALARM 30, Motor phase U missing
Motor phase U between the adjustable frequency drive
and the motor is missing.
Remove power from 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.
Remove power from 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.
Remove power from the adjustable frequency drive and
check motor phase W.
ALARM 33, Inrush fault
Too many power-ups have occurred within a short time
period. Let the unit cool to operating temperature.
WARNING/ALARM 34, Fieldbus communication fault
The serial communication bus on the communication
option card is not working.
WARNING/ALARM 35, Option fault
An option alarm is received. The alarm is option-specic.
The most likely cause is a power-up or a communication
fault.
WARNING/ALARM 36, Mains failure
This warning/alarm is only active if the supply voltage to
the adjustable frequency drive is lost and
parameter 14-10 Mains Failure is NOT set to [0] No Function.
Check the fuses to the adjustable frequency drive and line
power supply to the unit.
ALARM 37, Phase imbalance
There is a current imbalance between the power units
ALARM 38, Internal fault
When an internal fault occurs, a code number dened in
Table 7.4 is displayed.
Troubleshooting
Cycle power
Check that the option is properly installed
Check for loose or missing wiring
Troubleshooting
VLT
®
Compressor Drives CDS 302/CDS 303
156 Danfoss A/S © Rev. 2013-07-03 All rights reserved. MG34M422
77

Danfoss VLT CDS 303 Specifications

General

Brand	Danfoss
Model	VLT CDS 303
Category	DC Drives
Language	English