Danfoss VLT HVAC Series Programming Manual page 290

4 Troubleshooting
ALARM 16, Short circuit:
There is short-circuiting in the motor or on the motor terminals.
Turn off the adjustable frequency drive and remove 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 par.8-04
tion OFF
is NOT set to .
If par.8-04 Control Timeout Function
appears and the adjustable frequency drive ramps down to zero speed,
while giving an alarm.
Control Timeout Time
par.8-03
4
WARNING 22, Hoist Mech. Brake:
The report value will show what kind it is.
0 = The torque ref. was not reached before timeout
1 = There was no brake feedback before timeout
WARNING 23, Internal fans:
External fans have failed due to defect hardware or fans not mounted.
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 par.
14-53 Fan Monitor , [0] Disabled.
WARNING 25, Brake resistor short-circuited:
The brake resistor is monitored during operation. If it short-circuits, the
brake function is disconnected and the warning appears. The adjustable
frequency drive still works, but without the brake function. Turn off the
adjustable frequency drive and replace the brake resistor (see par.
Brake Check
2-15 ).
ALARM/WARNING 26, Brake resistor power limit:
The power transmitted to the brake resistor is calculated as a percentage,
as a mean value over the last 120 s, on the basis of the resistance value
of the brake resistor (par.2-11
ate circuit voltage. The warning is active when the dissipated braking
energy is higher than 90%. If
Power Monitoring , the adjustable frequency drive cuts out and issues this
alarm, when the dissipated braking energy is higher than 100%.
WARNING/ALARM 27, Brake chopper fault:
The brake transistor is monitored during operation and if it short-circuits,
the brake function disconnects and the warning comes up. The adjustable
frequency drive is still able to run, but since the brake transistor has short-
circuited, substantial power is transmitted to the brake resistor, even if it
is inactive.
Turn off the adjustable frequency drive and remove the brake resistor.
Warning: There is a risk of substantial power being
transmitted to the brake resistor if the brake transistor
is short-circuited.
ALARM/WARNING 28, Brake check failed:
Brake resistor fault: the brake resistor is not connected/working.
4-8
Control Timeout Func-
is set to Stop and Trip , a warning
could possibly be increased.
Brake Resistor (ohm)
) and the intermedi-
Trip [2] has been selected in par.2-13
MG.11.C6.22 - VLT
WARNING/ALARM 29, Drive overtemperature:
If the enclosure is IP00, IP20/Nema1 or IP21/TYPE 1, the cut-out tem-
perature of the heatsink is 203° + 41°F [95° + 5°C]. The temperature
fault cannot be reset, until the temperature of the heatsink is below 158°F
[70°C].
The fault could be:
- Ambient temperature too high
- Too long motor cable
ALARM 30, Motor phase U missing:
Motor phase U between the adjustable frequency drive and the motor is
missing.
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 33, Soft-charge fault:
Too many power-ups have occured within a short time period. See the
chapter General Specifications
within one minute.
WARNING/ALARM 34, Fieldbus communication fault:
The serial communication bus on the communication option card is not
working.
WARNING/ALARM 36, Mains failure:
This warning/alarm is only active if the supply voltage to the adjustable
frequency drive is lost and par.14-10
sible correction: check the fuses to the adjustable frequency drive
WARNING/ALARM 37, Phase Imbalance:
Brake
There is a current imbalance between the power units.
ALARM 38, Internal fault:
Contact your local Danfoss supplier.
ALARM 39, Heatsink Sensor:
No feedback from the heatsink sensor.
WARNING 40, Overload of Digital Output Terminal 27
Check the load connected to terminal 27 or remove the short-circuit con-
nection. Check par.5-00
Mode
.
WARNING 41, Overload of Digital Output Terminal 29:
Check the load connected to terminal 29 or remove the short-circuit con-
nection. Check par.5-00
Mode
.
WARNING 42, Overload of Digital Output On X30/6:
Check the load connected to X30/6 or remove short circuit connection.
Term X30/6 Digi Out (MCB 101)
Check par.5-32
® is a registered Danfoss trademark
VLT ® HVAC Drive Programming Guide
for the allowed number of power-ups
Line Failure
is NOT set to OFF. Pos-
Digital I/O Mode Terminal 27
and par.5-01
Digital I/O Mode Terminal 29
and par.5-02
.