WARNING 47, 24V supply low
The 24 V DC is measured on the control card. The external
24 V DC backup power supply may be overloaded,
otherwise contact your Danfoss supplier.
WARNING 48, 1.8V supply low
The 1.8 V DC supply used on the control card is outside of
allowable limits. The power supply is measured on the
control card. Check for a defective control card. If an
option card is present, check for an overvoltage condition.
WARNING 60, External interlock
A digital input signal is indicating a fault condition external
to the Adjustable frequency drive. An external interlock has
commanded the Adjustable frequency drive to trip. Clear
the external fault condition. To resume normal operation,
apply 24V DC to the terminal programmed for external
interlock. Reset the Adjustable frequency drive.
WARNING/ALARM 65, Control card over temperature
The cutout temperature of the control card is 176° F
[80
°
C].
Troubleshooting
•
Check that the ambient operating temperature is
within limits.
•
Check for clogged filters.
•
Check fan operation.
•
Check the control card.
WARNING 66, Heatsink temperature low
This warning is based on the temperature sensor in the
IGBT module. See for the temperature reading that triggers
this warning.
Troubleshooting:
The heatsink temperature measured as 32° F [0
°
C] could
indicate that the temperature sensor is defective, and
therefore causing the fan speed to increase to the
maximum. If the sensor wire between the IGBT and the
gate drive card is disconnected, this warning is produced.
Also, check the IGBT thermal sensor (see
).
ALARM 67, Option module configuration has changed
One or more options have either been added or removed
since the last power-down. Check that the configuration
change is intentional and reset the unit.
ALARM 68, Safe stop activated
Loss of the 24V DC signal on terminal 37 has caused the
filter to trip. To resume normal operation, apply 24V DC to
terminal 37 and reset the filter.
ALARM 70, Illegal Adjustable frequency drive configuration
The control card and power card are incompatible. Contact
your supplier with the type code of the unit from the
nameplate and the part numbers of the cards to check
compatibility.
ALARM 79, Illegal power section configuration
The scaling card is the incorrect part number or not
installed. Also MK102 connector on the power card could
not be installed.
ALARM 80, Drive initialized to default value
Parameter settings are initialized to default settings after a
manual reset. Reset the unit to clear the alarm.
WARNING 250, New spare part
The power or switch mode power supply has been
exchanged. The filter type code must be restored in the
EEPROM. Select the correct type code in
14-23 Typecode
Setting
according to the label on the unit. Remember to
select ‘Save to EEPROM’ to complete.
WARNING 251, New type code
The power card or other components have been replaced
and the type code changed. Reset to remove the warning
and resume normal operation.
ALARM 300, Mains cont. fault
Line power contactor fault is displayed when the feedback
signal indicates that the contactors are not in the expected
state, i.e., either of the two contactors could not close or
could not open, or there is a feedback signal error.
Troubleshooting:
Control and feedback wiring check
Verify that the control and feedback is wired correctly and
there are no loose connections. The 24 V DC output of the
control card is from terminal 12 and the contactor
feedback goes to terminals 32 and 33. The contactor is
energized from a control transformer through the power
card relay.
•
Perform a visual inspection of the control and
feedback wiring to verify there is no damage to
the wire insulation.
•
Perform a continuity check to test for broken
wires between the control transformer and
terminal 4 on MK112.
Perform the Control Card Digital Inputs/Outputs Test
(
6.3.8 Control Card Digital Inputs/Outputs Test
).
Contactors test
Perform a continuity test of the contactors between the
input terminal and output terminals. If continuity is
detected, replace the contactor fuse. There should also be
no continuity between any two test points of the three
phases for either the input or the output.
Loss of line power
A loss of AC line voltage will cause the contactors to open.
Check the line power supply. Consider use of auto reset.
Other
If none of the above tests have identified the problem,
replace the power card.
Troubleshooting
VLT Advanced Active Filter AAF006 D and E Frames Service Manual
MG90Z122 - VLT
®
is a registered Danfoss trademark
4-9
4
4
