15-50 SW ID Power Card
15-60 Option Mounted
15-61 Option SW Version
(for each option slot)
ALARM 16, Short circuit
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 will only be active when
8-04 Control Word
Timeout Function
is NOT set to
OFF
.
If
8-04 Control Word 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 Word 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 been able to exceed
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.
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 filters, the regulated voltage to
the fans is monitored.
Troubleshooting
Check for proper fan operation.
Cycle power to the Adjustable frequency drive
and make sure that the fan operates briefly at
start-up.
Check the sensors on the heatsink and control
card.
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
Check for proper fan operation.
Cycle power to the Adjustable frequency drive
and make sure that the fan operates briefly 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
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
2-16 AC brake Max.
Current
. The warning is active when the dissipated braking
is higher than 90% of the brake resistance power. If
Trip
[2]
is selected in
2-13 Brake Power Monitoring
, the Adjustable
frequency drive will trip 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
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 defined heatsink temperature.
The trip and reset points are different based on the
Adjustable frequency drive power size.
Troubleshooting
Check for the following conditions.
Ambient temperature too high.
Motor cable too long.
Incorrect airflow clearance above and below the
Adjustable frequency drive
Blocked airflow around the Adjustable frequency
drive.
General Specifications and ...
VLT
®
HVAC Drive Design Guide
8-38
MG11BB22 - VLT
®
is a registered Danfoss trademark
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