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

Page: 113 / 116

Pub.# 890046-10-00
Dec. 2015
Section 4, Page
31
of
32
500 - 700 HP Configuration/Description
- Input rectifier circuit arrangement consists of 6 Diode/SCR modules.
- Pre-Charge circuit resistor/diode circuit between T phase to P1.
- Pre-Charge Resistors 500 HP 8 ohms
600 HP 10 ohms
700 HP 12 ohms (2 - 24 ohms parallel)
- Three internal inline fuses, no DC Bus fusing. The fuse indicators are monitored via the same DC Bus input (CN13) to the Main
SMPS bd.
- No DC Link Reactor.
- 500 HP has 3 dual IGBT Modules. 600 - 700 HP have 6 dual IGBT Modules.
- 500 HP uses 5 fans (see paragraph under Fan Bds. Dealing with jumpers). 600 - 700 HP have 6 fans.
- All have both a Thermal switch (CN18) and an NTC Thermistor (CN7) input to the Main SMPS Bd. See Switch J1 description.
Related Faults: Fan Lock Fault from fans and/or heat sink temperature from thermal switch (See Fan Board Description), NTC Open
for IGBT over temperature from Thermistor.
Module
Test polarity
Reading Module
Test polarity
Reading
+ - + -
Line Fuses
Fuse 1 R across fuse Closed
Fuse
Indicators
Fuse 1 across indicator Closed
Fuse 2 S across fuse Closed Fuse 2 across indicator Closed
Fuse 3 T across fuse Closed Fuse 3 across indicator Closed
These indicators are connected in series.
SCR's
SCR1/
SCR2
R P1 (+) Open
Diodes
D1/
D2
R N (-) Open
P1 (+) R Open N (-) R Closed
SCR3/
SCR4
S P1(+) Open
D3/
D4
S N (-) Open
P1(+) S Open N (-) S Closed
SCR5/
SCR6*
T P1(+) Open
D5/
D6
T N (-) Open
P1(+) T Open N (-) T Closed
*SCR5/6: Measurement is D7 and Pre-Charge Resistor
IGBT's
Tr1(1a)
U P1(+) Closed
IGBT's
(cont’d)
Tr4(4a)
U N (-) Open
P1(+) U Open N (-) U Closed
Tr3(3a)
V P1(+) Closed
Tr6(6a)
V N (-) Open
P1(+) V Open N (-) V Closed
Tr5(5a)
W P1(+) Closed
Tr2(2a)
W N (-) Open
P1(+) W Open N (-) W Closed