Danfoss VLT Series Programming Manual page 375

Diagnostics
Fault Possible cause
DC-link voltage Incorrect mains
too low. supply.
DC overcurrent. The sum of the
servo drive
current exceeds
the maximum
rating of the
SAB.
U overcurrent. The servo drives
AUX
are consuming
more power on
the U line
AUX
than allowed.
U Incorrect U
AUX AUX
overvoltage. supply.
U Incorrect U
AUX AUX
undervoltage. supply.
Mains phase A phase is
loss. missing on the
supply side, or
the voltage
imbalance is too
high.
MG36D102
Programming Guide
Possible solution
Check supply voltage
matches the allowed specifi-
cation detailed in chapter
ISD Safety Concept in the
®
VLT Integrated Servo Drive
®
ISD 510 System Operating
Instructions.
•
Check the servo drive
current consumption.
•
Avoid simultaneous
acceleration of all servo
drives.
•
Check the number of
attached servo drives
with the shell diagrams
®
in the VLT Integrated
®
Servo Drive ISD 510
System Design Guide.
•
Avoid simultaneous
lifting of the servo drive
brakes.
Check that the supply
matches the allowed specifi-
cation detailed in chapter
Electrical Installation in the
®
VLT Integrated Servo Drive
®
ISD 510 System Operating
Instructions.
•
Check that the supply
matches the allowed
specification detailed in
chapter Electrical Instal-
®
lation in the VLT
Integrated Servo Drive
®
ISD 510 System
Operating Instructions.
•
Check that the output
power of the supply is
sufficient.
Check the supply voltages
and supply currents to the
SAB.
Danfoss A/S © 01/2017 All rights reserved.
Fault Possible cause
Grounding fault. Grounding fault.
Brake resistor Faulty brake
error. resistor.
Brake chopper Faulty brake
error. chopper.
Table 9.4 Troubleshooting SAB
Possible solution
•
Check for proper
grounding and loose
connections.
•
Check the hybrid cables
for short circuits or
leakage currents.
Remove the power to the
SAB, wait for the discharge
time to elapse, then replace
the brake resistor.
Check the setting in
parameter 2-15 Brake Check.
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