Danfoss VLT series, Service Manual

Page: 53 / 158

3-9
VLT is a registered Danfoss trademark
ALARM: 22 (continued)
AUTO MOT ADAPT FAIL
[2] ASYMMETRICAL IMPEDANCE
AMA has detected asymmetrical impedance in the windings
of the motor connected.
The motor may be defective. Check motor and motor
connections.
[3] MOTOR TOO BIG
AMA function was unable to be carried out due to incorrect
settings or incorrect results of AMA tests.
The motor is too large for AMA to be carried out or the setting
in parameter 102 is incorrect. Ensure that the motor is sized
correctly. Correct the setting and restart AMA.
[4] MOTOR TOO SMALL
AMA function was unable to be carried out due to incorrect
settings or incorrect results of AMA tests.
The motor is too small for AMA to be carried out or the setting
in parameter 102 is incorrect. Ensure that the motor is sized
correctly. Correct the setting and restart AMA.
[5] TIME OUT
AMA has failed after attempting to tune for a period in excess
of what should be normal.
It is possible that the signal data being returned is noisy.
It is possible to make several attempts under these conditions
and eventually get the unit to pass.
[6] INTERRUPTED BY USER
The AMA function cannot be completed due to the application
of a stop command by the user. Repeat AMA procedure.
[7] INTERNAL FAULT
A fault has occurred internal to the VLT.
Failed Control Card or noise interference. Repeat AMA
procedure, if fault reoccurs, replace Control Card.
[8] LIMIT VALUE FAULT
The parameter values programmed for the motor are outside
the typical characteristics of the drive’s internal motor table.
This is due to the use of a non-standard motor.
Set p. 107 to “Enable R
S
” and restart AMA. If this fault reoccurs,
AMA cannot be performed on this particular motor.
[9] MOTOR ROTATES
The motor shaft rotated during the tuning process due to an
overhauling load. Ensure the load is not capable of rotating
the shaft, and restart AMA.
WARNING/ALARM 23
BRAKE TEST FAILED
(Not applicable for the VLT 4000/6000/8000.)
When a unit with braking is powered-up and a stop command
is present, a brake test is performed automatically by the unit.
If the result of this test indicates a fault condition in the brake
circuit and parameter 404 is set to warning, a warning will be
displayed. If
Trip has been set in 404 an alarm will occur. The
unit will be able to operate in this condition, however, the brake
function will be inoperative.
Manual reset is possible.
Possible causes for this are: No brake resistor connected, or
a faulty connection to the brake resistor, defective brake
resistor or a defective brake IGBT, faulty brake firing circuit
(Power Card).
Check all brake resistor connection, check resistor, perform
Brake IGBT test (Static Test Section).
WARNING 25
BRAKE RESISTOR FAULT
(Not applicable for the VLT 4000/6000/8000.)
The brake resistor or the connection is short circuited. The
unit will be able to operate in this condition, however, the brake
function will be inoperative.
Manual reset is possible.
Ground fault in brake resistor circuit, shorted resistor cable,
too low resistance in resistor.
Check all brake resistor connections for short circuits, check
resistor value.
WARNING 26
BRK PWR WRN 100%
(Not applicable for the VLT 4000/6000/8000.)
Brake resistor power 100%. The monitoring function has been
activated in parameter 403. The power transmitted to the
brake resistor is monitored over a 120 second period. The
power is based on the values entered in parameters 401 and
402. If the calculated power being dissipated exceeds 100%
a warning will occur based on the choice in parameter 403. If
warning is selected the warning will disappear when the
dissipated power drops below 80%.
Manual reset is possible.
Overhauling motor load, load inertia too high, ramp down time
incorrectly set.
Check ramp down time (para. 208) settings. Check for
overhauling motor load. If load inertia is too high, load must be
reduced or drive and resistor must be resized.