Danfoss VLT HVAC Drive FC 102 Design Manual page 234

General Specifications and ...
ALARM 15, Hardware mismatch
A fitted option is not operational with the present control
board hardware or software.
Record the value of the following parameters and contact
Danfoss.
15-40 FC Type
15-41 Power Section
15-42 Voltage
15-43 Software Version
15-45 Actual Typecode String
15-49 SW ID Control Card
15-50 SW ID Power Card
15-60 Option Mounted
15-61 Option SW Version (for each option slot)
ALARM 16, Short circuit
8 8
There is short-circuiting in the motor or motor wiring.
Remove power to the adjustable frequency drive and
repair the short circuit.
WARNING/ALARM 17, Control word timeout
There is no communication to the adjustable frequency
drive.
The warning is only active when 8-04 Control Timeout
Function is not set to OFF.
If 8-04 Control Timeout Function is set to Stop and Trip, a
warning appears and the adjustable frequency drive ramps
down until it stops then displays an alarm.
Troubleshooting:
Check connections on the serial communication
cable.
Increase 8-03 Control Timeout Time
Check the operation of the communication
equipment.
Verify a proper installation based on EMC
requirements.
ALARM 18, Start failed
The speed has not exceeded 1-77 Compressor Start Max
Speed [RPM] during start within the allowed time. (set in
1-79 Compressor Start Max Time to Trip). This may be
caused by a blocked motor.
232
Design Guide
WARNING 23, Internal 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 14-53 Fan Monitor ([0] Disabled).
For the D, E, and F Frame units, the regulated voltage to
the fans is monitored.
Troubleshooting
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 14-53 Fan Monitor ([0] Disabled).
Troubleshooting
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 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 s of run time. The
calculation is based on the intermediate circuit voltage and
the brake resistance value set in 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 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.
Danfoss A/S © Rev. 2014-01-13 All rights reserved.
Check for proper fan operation.
Cycle power to the adjustable frequency drive
and check that the fan operates briefly at start-
up.
Check the sensors on the heatsink and control
card.
Check for proper fan operation.
Cycle power to the adjustable frequency drive
and check that the fan operates briefly at start-
up.
Check the sensors on the heatsink and control
card.
MG16C122