Danfoss VLT FC 103 Operating Manual page 77

Maintenance, Diagnostics, a...
ALARM 90, Feedback monitor
Check the connection to encoder/resolver option and, if
®
necessary, replace VLT Encoder Input MCB 102 or VLT
Resolver Input MCB 103.
ALARM 91, Analog input 54 wrong settings
Set switch S202 in position OFF (voltage input) when a
KTY sensor is connected to analog input terminal 54.
WARNING 98, Clock fault
Time is not set or the RTC clock has failed.
Troubleshooting
•
Reset the clock in parameter 0-70 Set Date and
Time.
ALARM 99, Locked rotor
The rotor is blocked.
WARNING/ALARM 104, Mixing fan fault
The fan is not operating. The fan monitor checks that the
fan is spinning at power-up or whenever the mixing fan is
turned on. The mixing-fan fault can be configured as a
warning or an alarm trip in parameter 14-53 Fan Monitor.
Troubleshooting
•
Cycle power to the drive to determine if the
warning/alarm returns.
WARNING/ALARM 122, Mot. rotat. unexp.
The drive performs a function that requires the motor to
be at standstill, for example DC hold for PM motors.
WARNING 163, ATEX ETR cur.lim.warning
The drive has run above the characteristic curve for more
than 50 s. The warning is activated at 83% and deactivated
at 65% of the allowed thermal overload.
ALARM 164, ATEX ETR cur.lim.alarm
Operating above the characteristic curve for more than
60 s within a period of 600 s activates the alarm, and the
drive trips.
WARNING 165, ATEX ETR freq.lim.warning
The drive is running for more than 50 s below the allowed
minimum frequency (parameter 1-98 ATEX ETR interpol.
points freq.).
ALARM 166, ATEX ETR freq.lim.alarm
The drive has operated for more than 60 s (in a period of
600 s) below the allowed minimum frequency
(parameter 1-98 ATEX ETR interpol. points freq.).
ALARM 244, Heat sink temperature
The maximum temperature of the heat sink has been
exceeded. The temperature fault cannot reset until the
temperature drops below a defined heat sink temperature.
The trip and reset points are different based on the power
size. This alarm is equivalent to alarm 29, Heat Sink Temp.
MG16P222
Operating Guide
Troubleshooting
Check for the following conditions:
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WARNING 251, New typecode
The power card or other components are replaced, and the
type code has changed.
ALARM 421, Temperature fault
A fault caused by the on-board temperature sensor is
detected on the fan power card.
Troubleshooting
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ALARM 423, FPC updating
The alarm is generated when the fan power card reports it
has an invalid PUD. The control card attempts to update
the PUD. A subsequent alarm can result depending on the
update. See A424 and A425.
ALARM 424, FPC update successful
This alarm is generated when the control card has
successfully updated the fan power card PUD. The drive
must be reset to stop the alarm.
ALARM 425, FPC update failure
This alarm is generated after the control card failed to
update the fan power card PUD.
Troubleshooting
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ALARM 426, FPC config
The number of found fan power cards does not match the
number of configured fan power cards. See parameter
group 15-6* Option Ident for the number of configured fan
power cards.
Troubleshooting
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ALARM 427, FPC supply
Supply voltage fault (5 V, 24 V, or 48 V) on fan power card
is detected.
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Ambient temperature too high.
Motor cables too long.
Incorrect airflow clearance above or below the AC
drive.
Blocked airflow around the unit.
Damaged heat sink fan.
Dirty heat sink.
Check wiring.
Check sensor.
Replace fan power card.
Check the fan power card wiring.
Replace fan power card.
Contact supplier.
Check fan power card wiring.
Replace fan power card.
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