BENSHAW RSi-030-SG-4B, Service Manual

Page: 103 / 116

Pub.# 890046-10-00
Dec. 2015
Section 4, Page
21
of
32
Fault Causes Solutions
Out Phase
Open
Open Output ‐ either wiring or
contactor/switch on output of
drive.
Check output wiring and connections. Check output
contactor/switch if applicable.
Low Current ‐ Drive has
detected low current or no
current flow out of drive.
Parameter checks:
AFN ‐ 40 Motor Capacity.
AFN ‐ 44 No Load Current (if not know ~ 33% of motor
amps).
FUN ‐ 57, if yes,
FUN ‐ 58 current level (percentage of motor amps,
DRV ‐ 05).
FUN ‐ 59 trip time.
Single Phase output from drive. Measure phase ‐ phase voltage output at 60 Hz. with
no motor connected. Change FUN ‐ 57 to "No" for
this test.
Poor connections at Main
SMPS PC Board (>150 HP)
Perform check of PC Board connections per 1) below.
No Motor
Trip
Same as Output Phase Open
except specifically related to
parameters FUN ‐ 57, FUN ‐ 58
and FUN ‐ 59
Parameter checks: FUN ‐ 57, if yes,
FUN ‐ 58 current level (percentage of motor amps,
DRV ‐ 05).
FUN ‐ 59 trip time.
1) Check PC Board Connections
a. Power Down.
b. Remove upper cover of VFD.
c. Below is a picture of the internal PC Boards (Control Bd. And Main SMPS).
d. LEM Feedback / DC Power connectors are in the upper left of the Main SMPS
board. Push in, wiggle. Possible intermittent connection of current feedback.
e. IGBT firing connectors along bottom of board. Same routine.
f. Start VFD. Monitor output current. Clamp on, etc.