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

Page: 109 / 116

Pub.# 890046-10-00
Dec. 2015
Section 4, Page
27
of
32
150 - 250 HP Configuration/Description
- Input rectifier circuit arrangement consists of 3 Diode/SCR modules.
- Pre-Charge resistor/diode circuit between R and P1/P2 (jumper).
- No P1 terminal due to a DC Link Reactor in the Positive DC Bus rail.
- Two DC Bus fuses in the DC Positive Bus Rail.
- Six dual IGBT Modules.
- Three Heat Sink Fans
- No Thermal Switch Input (OHD Terminal, connector CN18). See Switch J1 description.
- Three Heat Sink Fans
- NTC input to main SMPS
Module
Test polarity
Reading Module
Test polarity
Reading
+ -
+ -
DC Bus
Fuses
Fuse 1 across fuse Closed
Fuse
Indicators
Fuse 1 across indicator Closed
Fuse 2 across fuse Closed Fuse 2 across indicator Closed
Fuses are in parallel, visual check indicators first
SCR's
SCR1
R P2 (+) Open
Diodes
D4
R N (-) Open
P2 (+) R Open N (-) R Closed
SCR2
S P2 (+) Open
D5
S N (-) Open
P2 (+) S Open N (-) S Closed
SCR3
T P2 (+) Open
D6
T N (-) Open
P2 (+) T Open N (-) T Closed
All SCR's have a snubber circuit across them.
IGBT's
Tr1(1A)
U P2 (+) Closed
IGBT's
(cont’d)
Tr4(4A)
U N (-) Open
P2 (+) U
Open
N (-) U Closed
Tr3(3A)
V P2 (+) Closed
Tr6(6A)
V N (-) Open
P2 (+) V
Open
N (-) V Closed
Tr5(5A)
W P2 (+) Closed
Tr2(2A)
W N (-) Open
P2 (+) W
Open
N (-) W Closed