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

Page: 107 / 116

Pub # 890046-10-00
Dec. 2015
Section 4, Page
25
of
32
4.8 Power Component Check
50 - 125 HP Configuration/Description
- <125HP Input rectifier circuit arrangement consists of 3 diode/SCR modules.
- 125 HP has 6 diode/SCR modules.
- All SCR's have a snubber circuit across them.
- Pre-charge resistor circuit between R and P1/P2 (jumper) parallel with the snubber circuit.
- One DC Bus fuse in the Positive DC Bus rail.
- One 3-phase output module (IGBT bridge)
- Thermistor (PTC) internal to IGBT output module
Module
Test polarity
Reading Module
Test polarity
Reading
+ - +
-
DC Bus
Fuse
Fuse 1 across fuse Closed
Fuse
Indicator
Fuse 1 across indicator Closed
SCR's
*SCR1
D1
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
*measurement is across R
pre
/D1 (series) in parallel with SCR1
125 HP has 6 SCR/Diode modules (SCR1a, SCR2a, D1a, D2a, etc.)
IGBT's
Tr1
U P2 (+) Closed
IGBT's
Tr4
U N (-) Open
P2 (+) U Open N (-) U Closed
Tr3
V P2 (+) Closed
Tr6
V N (-) Open
P2 (+) V Open N (-) V Closed
Tr5
W P2 (+) Closed
Tr2
W N (-) Open
P2 (+) W Open N (-) W Closed