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Faults
8.4 Troubleshooting
When problems occur in the servo system, they must first be located and properly identified.
Table 8.1 lists potential faults on the connection box, their possible causes and actions for correcting the faults.
Contact Danfoss Service if it is not possible to correct the fault.
Fault/Fault Code on 7-
segment Display
LED "CAN" is lit red constantly
LED "CAN" is off
LED "RUN/Err" is lit red
constantly
LED "UZK" is off although
DC 300 V power supply is
connected.
Error code 3100 (hex)
Error code 3101 (hex)
Error code 3102 (hex)
Error code 3110 (hex)
Error code 3111 (hex)
Error code 3118 (hex)
Error code 3119 (hex)
Warning code 3180 (hex)
Warning code 3181 (hex)
Warning code 3190 (hex)
Warning code 3191 (hex)
Error code 3200 (hex)
®
VLT
ISD Connection Box Operating Instructions
Possible Cause
CAN error.
No CAN messages on the bus.
Active connection box error.
•
Cable connected incorrectly.
•
300 V DC power supply voltage not
present.
•
Connection box not switched on.
Input voltage (U
) above absolute
DC
maximum.
Input voltage (U
below absolute
DC
minimum.
Input voltage (U
) below intermediate
DC
voltage (U
) during power up.
ZK
24 V power supply loss.
24 V power supply timeout during initiali-
sation.
5 V CAN power supply loss.
5 V CAN power supply timeout during
initialisation.
Switch on, nominal U
range:
DC
Input voltage above maximum.
Switch on, nominal U
range:
DC
Input voltage below minimum.
Switch on: 24 V power supply bad.
Switch on: 5 V CAN power supply bad.
Hazardous intermediate circuitry voltage.
®
MG75G102 - VLT
is a registered Danfoss trademark
Possible Solution
•
Check cabling
•
Check terminating resistors
•
Check cabling
•
Check master
See error and warning codes below.
•
Check cabling
•
Check DC 300 V power supply
•
Switch connection box on via a command from the
master or by configuring parameter autoSwitchOn
Check stability of 300 V DC power supply
Check stability of 300 V DC power supply
•
Check stability of 300 V DC power supply
•
Ensure servomotors are not active during power up so
power feedback cannot occur
•
Ensure no power supply is connected on the output
side
•
Check cabling
•
Check 24 V power supply
•
Check cabling
•
Check 24 V power supply ramp-up time
•
Check cabling
•
Contact Danfoss Service to check the 5 V internal
power supply
•
Check cabling
•
Contact Danfoss Service to check the 5 V internal
power supply ramp-up time
Check power supply range
Check power supply range
•
Check cabling
•
Check 24 V power supply
•
Check cabling
•
Contact Danfoss Service to check the 5 V internal
power supply
Contact Danfoss Service
8
8
41
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