19
12)
Disconnect all control
signal wires on the control
card.
Does that remove the
fault?
9)
Symptom
No fault report or light in
display.
10)
Have prefuses for the VLT
adjustable frequency drive
blown, F1, F2, F3 or F4,
F5, 56?
YES NO
11)
If one or more of the fuses
F1, F2 or F3 have blown,
test the input rectifiers and
the inverter section, pages
25 and 26. If one or more
of the fuses F4, F5 or F6
have blown test the soft
charge circuit, page 23.
NO YES
13)
The fault may be caused
by a short circuit in the
control signals.
Check control wiring for
proper connection.
NO YES
15)
Test the Soft Charge
Circuit and input rectifier,
pages 23-25.
17)
Replace the Interface/ILD
card, see page 30. Does
the fault disappear?
YES NO
16)
Replace the Control Card,
see page 31. Does the
problem disappear?
Resume
operation
YES NO
Consult
factory
Resume
operation
14)
Is the DC Bus voltage OK?
Measure the DC Bus
voltage between terminals
(89) +VDC and (88) –VDC.