Danfoss VLT AQUA Drive FC 202 Operating Manual page 56

Maintenance, Diagnostics, a...
WARNING
HIGH VOLTAGE
Frequency converters contain high voltage when
connected to AC mains input, DC supply, or load sharing.
Failure to use qualified personnel to install, start up, and
maintain the frequency converter can result in death or
serious injury.
•
Disconnect power before proceeding.
WARNING/ALARM 17, Control word timeout
There is no communication to the frequency converter.
The warning is only active when parameter 8-04 Control
Timeout Function is NOT set to [0] Off.
If parameter 8-04 Control Timeout Function is set to [5] Stop
and trip, a warning appears, and the frequency converter
ramps down to a stop and shows an alarm.
7 7
Troubleshooting
•
Check the connections on the serial communi-
cation cable.
•
Increase parameter 8-03 Control Timeout Time.
•
Check the operation of the communication
equipment.
•
Verify that proper EMC installation was
performed.
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
The value of this warning/alarm shows the type of
warning/alarm.
0 = The torque reference was not reached before timeout
(parameter 2-27 Torque Ramp Up Time).
1 = Expected brake feedback was 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 a 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 frequency converters 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 frequency converters with AC fans, the
voltage to the fan is monitored.
54
®
VLT AQUA Drive FC 202
Troubleshooting
•
•
•
WARNING 24, External fan fault
The fan warning function is a 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 frequency converters 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 frequency converters 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 frequency converter 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 power
is higher than 90% of the brake resistor power. If option [2]
Trip is selected in parameter 2-13 Brake Power Monitoring,
the frequency converter trips when the dissipated braking
power 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 frequency converter is still
operational, but since the brake transistor has short-
circuited, substantial power is transmitted to the brake
resistor, even if it is inactive.
Troubleshooting
•
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
Troubleshooting
•
Danfoss A/S © 11/2016 All rights reserved.
Check for proper fan operation.
Cycle power to the frequency converter and
check that the fan operates briefly at start-up.
Check the sensors on the control card.
Check for proper fan operation.
Cycle power to the frequency converter and
check that the fan operates briefly at start-up.
Check the sensors on the heat sink.
Remove the power to the frequency converter
and replace the brake resistor (refer to
parameter 2-15 Brake Check).
Remove power to the frequency converter and
remove the brake resistor.
Check parameter 2-15 Brake Check.
MG21A402