Danfoss VLT series, Service Manual

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3-8
VLT is a registered Danfoss trademark
ALARM 15
SWITCH MODE FAULT
The internal plus and/or minus 18 VDC power supply voltage
is not within the specified range.
This fault results in a Trip Locked condition.
This is normally due to a faulty Control Card.
Remove all I/O connectors from Control Card. If message
remains, replace Control Card.
See Switch Mode Power Supply Test (5.2.2) in Section 5.
ALARM 16
CURR.SHORT CIRCUIT
This indicates that the instantaneous output current has
exceeded the maximum level for that drive.
This fault results in a Trip Locked condition.
Refer to over current section in the application section.
This is due to a phase to phase short circuit in motor or motor
wiring.
Check motor and cabling for shorts.
WARNING/ALARM 17
STD BUS TIMEOUT
Indicates the serial communication with the drive has failed
and the time out function has been activated. The delay time
programmed determines how long the warning will be present
before a trip, provided “stop and trip” has been selected.
Manual reset is possible.
Loss of serial communication signal due to faulty wiring or
communication equipment (PC, PLC, RS232/485 Adaptor, etc.)
Check connections on serial communication cable. Check
operation of communication equipment.
WARNING/ALARM 18
HPFB BUS TIMEOUT
Indicates the communication between a high performance
field bus option (such as DeviceNet) and the drive has failed
and the time out function has been activated in parameter
804. The delay time programmed in parameter 803 determines
how long the warning will be present before a trip, provided
“stop and trip” has been selected in parameter 804. Manual
reset is possible.
Faulty connection in communication wiring, or faulty control
node (PLC) in communication network. Check connections
on serial communication cable.
WARNING 20
EE ERROR CTRL CARD
Fault in the EEPROM on the control card. A fault exists in the
ability of the VLT to read and write information to the control
card EEPROM.
Failed EEPROM on Control Card.
The drive will operate normally and in most cases once the
power is cycled the warning clears.
If the problem halts operation replacement of control card may
be needed.
ALARM 21
AUTO MOTOR ADAPT OK
(Not applicable for the VLT 4000/6000/8000.)
Auto-optimization OK. The automatic motor tuning function
(AMA) has been completed successfully. It is necessary to
manually reset to resume normal operation.
AMA Function has been completed successfully.
No corrective action is needed. This alarm is displayed upon
completion of AMA to indicate a requirement to reset the drive
after performing AMA.
ALARM: 22
AUTO MOT ADAPT FAIL
Auto-optimization not OK. The automatic motor tuning function
failed. The possible causes as shown in the display are listed
below. The numbers in brackets will be logged as the value in
parameter 617.
Check settings of p. 102 - 106, and restart AMA.
In case of non-standard motor, set p. 107 to “Enable R
S
” and
restart AMA.
[0] CHECK P.103, 105
AMA function was unable to be carried out due to incorrect
settings or incorrect results of AMA tests.
Parameter 102, 103 or 105 has been set incorrectly. Correct
the setting and restart AMA.
[1] LOW P. 105
AMA function was unable to be carried out due to incorrect
settings or incorrect results of AMA tests.
The value entered in parameter 105 is too small for the drive.
Enter correct the value.
Note: the motor nameplate current, and the value entered in
parameter 105, must be greater than 35% of the nominal
rating of the drive in order to carry out AMA.