Danfoss VLT AutomationDrive FC 302 Instruction Manual page 56

Maintenance, Diagnostics an...
ALARM 16, Short circuit
There is short-circuiting in the motor or motor wiring.
Troubleshooting
•
Remove the 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 parameter 8-04 Control
Word Timeout Function is NOT set to [0] Off.
If parameter 8-04 Control Word Timeout Function is set to [5]
Stop and Trip, a warning appears and the adjustable
frequency drive ramps down until it stops, and then it
displays an alarm.
Troubleshooting
7 7
•
Check the connections on the serial communi-
cation cable.
•
Increase parameter 8-03 Control Word Timeout
Time.
•
Check the operation of the communication
equipment.
•
Verify a proper installation based on EMC
requirements.
WARNING/ALARM 20, Temp. input error
The temperature sensor is not connected.
WARNING/ALARM 21, Parameter error
The parameter is out of range. The parameter number is
reported in the display.
Troubleshooting
•
Set the affected parameter to a valid value.
WARNING/ALARM 22, Hoist mechanical brake
Report value shows what kind it is.
0 = The torque reference was not reached before timeout
(parameter 2-27 Torque Ramp Up Time).
1 = Expected brake feedback not received before timeout
(parameter 2-23 Activate Brake Delay, parameter 2-25 Brake
Release Time).
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 parameter 14-53 Fan Monitor ([0]
Disabled).
For adjustable frequency drives with DC fans, there is a
feedback sensor mounted in the fan. If the fan is
commanded to run and there is no feedback from the
sensor, this alarm appears. For adjustable frequency drives
with AC fans, the voltage to the fan is monitored.
54
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VLT AutomationDrive FC 302
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 parameter 14-53 Fan Monitor ([0]
Disabled).
For adjustable frequency drives with DC fans, there is a
feedback sensor mounted in the fan. If the fan is
commanded to run and there is no feedback from the
sensor, this alarm appears. For adjustable frequency drives
with AC fans, the voltage to the fan is monitored.
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.
Troubleshooting
•
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 DC link voltage and the brake
resistor 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 resistor power. If option [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.
Danfoss A/S © 06/2015 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.
Remove the power to the adjustable frequency
drive and replace the brake resistor (see
parameter 2-15 Brake Check).
MG34U422