Danfoss VLT AutomationDrive FC 302 Operating Instructions Manual page 70

Warnings and Alarms
Troubleshooting
Remove power to the frequency converter and
repair the ground fault.
Check for ground faults in the motor by
measuring the resistance to the ground of the
motor cables and the motor with a
megohmmeter.
Perform current sensor test.
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
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15-42 Voltage
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15-43 Software Version
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15-45 Actual Typecode String
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15-49 SW ID Control Card
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15-50 SW ID Power Card
9 9
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15-60 Option Mounted
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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 frequency converter and repair the
short circuit.
WARNING/ALARM 17, Control word timeout
There is no communication to the frequency converter.
The warning is only active when 8-04 Control Word Timeout
Function is not set to [0] Off.
If 8-04 Control Word Timeout Function is set to [2] Stop and
[26] Trip, a warning appears and the frequency converter
ramps down until it trips 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.
WARNING/ALARM 22, Hoist mechanical brake
Report value shows what kind it is.
0 = The torque ref. was not reached before time out
(Parameter 2-27).
1 = Expected brake feedback not received before time out
(Parameters 2-23, 2-25).
68
Operating Instructions
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).
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 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 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 [2] Trip
is selected in 2-13 Brake Power Monitoring, the frequency
converter trips when the dissipated braking power reaches
100%.
If the brake transistor is short-circuited, there is a risk of
substantial power being transmitted to the brake
resistor.
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.
Remove power to the frequency converter and remove the
brake resistor.
This alarm/warning could also occur if the brake resistor
overheats. Terminals 104 and 106 are available as brake
resistors Klixon inputs.
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
Check 2-15 Brake Check.
Danfoss A/S © Rev. 2014-02-20 All rights reserved.
Check fan resistance.
Check soft charge fuses.
Check fan resistance.
Check soft charge fuses.
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Remove power to the frequency converter and
replace the brake resistor (see 2-15 Brake Check).
WARNING
MG34U302