Danfoss VLT Series Service Manual page 14

Section Two
VLT 3002-3022, 230V
VLT 3002-3052, 400/500V
1)
Symptom
Motor operation unstable
4)
Verify correct settings have
been entered in Group 1
"Load & Motor"
5)
Symptom
Motor will not run
7)
Is the correct line voltage
present on the input terminals?
L1/R (91), L2/S (92), L3/T (93)
NO
See Item 11,
page 2-7
2 - 6
VLT 3502-3532, 230V
VLT 3502-3562, 400/500V
2)
Is the output phase to
phase voltage and
current balanced?
YES NO
6)
Is there light in the display?
NO YES
YES
See Item 12,
page 2-7
3)
Test the inverter
section, page 3-4
8)
Are fault messages displayed?
NO
See Item 18,
page 2-8
See Diagnostics section,
"Alarm Messages".
YES