Troubleshooting - Danfoss VLT Series Operating Instructions Manual

Troubleshooting

7 Troubleshooting
LED No. Indication
1 Green LED twinkling
2 Green LED blinking
3 No LED active
4 Red LED blinking
5 Red LED blinking
6 Red LED blinking
7 Red LED active
8 Red LED active
Table 7.1 Troubleshooting
®
VLT ISD Power Supply Module Operating Instructions
Fault Possible Cause
No output voltage Signal input "Enable"
not active
Reduced output voltage Signal input "300V" not
active
•
No output voltage No AC input voltage
•
Phases missing
Output voltage possibly Output current too high Check if output current
reduced
•
Output voltage possibly Fan blocked
reduced
•
Fan speed reduced
Output voltage possibly Internal heatsink
reduced temperature too high
No output voltage Internal heatsink
temperature too high
No output voltage Internal failure
®
MG75H102 - VLT is a registered Danfoss trademark
Measures Comments
Apply 10-28 V to signal Also possible: connect
input "Enable" 12 V auxiliary voltage
directly at the signal
connector (X3).
Apply 10-28 V to signal Also possible: connect
input "300 V", if full 12 V auxiliary voltage
output voltage directly at the signal
(Setpoint U ) is connector (X3).
o nominal
desired
Check AC input voltage If the power supply
module's external fuse
is blown, there is a
failure in the power
supply module. Send
the power supply
module to Danfoss.
–
is higher than current I
o
limitation
•
Check if fan is If the fan is blocked, the
mechanically locked, output current is
e.g. by parts automatically limited to
reaching inside the 4 A.
power supply (fan)
•
Send the power
supply module to
Danfoss for the fan
to be replaced
•
Check if air inlet and If the temperature is
outlet are free above "Warning Level",
the output current is
•
Check if the ambient
limited to 4 A.
temperature is too
high
•
Check if air inlet and If temperature is above
outlet are free "Fault Level", the output
is switched off
•
Check if the ambient
temperature is ≤ the
rated ambient
temperature of the
specification
Contact Danfoss-Service If the external fuse is
broken, do not try to
return the mains
voltage to the power
supply module.
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