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

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Part #
HP Where Used Description
Fan SMPS Board PC-100053-06 150 - 700 Receives DC Bus voltage from the capacitor bank. Creates 2 power
supplies, 6 VDC and 24 VDC. The 6 VDC is sent to the Main SMPS board
for SCR gate power. The 24 VDC is also sent to the Main SMPS board
(through RLY2, RLY3 & RLY4 contacts) then returned to each fan board to
power up to 2 fans.
Fuse, 1A, 600V,
100Kaic. Fast Acting FU-603 All
Connector ID Terminals Description
CN1 (pins 1 & 4) DCP-DCN DC Bus Voltage into board
CN2 (pins 1 & 3) G6-P6 6 VDC out to Main SMPS CN11
CN3 (pins 1, 2 & 3) 24N-24P These Fan boards power 2 fans only. CN3 and CN4 (Pins 1 & 3) provide
24 VDC to fans. CN3 & CN4 use pin 2 as part of an additional Fan
Monitoring circuit. Pin 2 from each fan feeds a comparator (OR gate) on the
fan board. Both low signals (0 VDC), no fault. If one fan locks up, a +5V at
the OR Gate generates a +5 V output, This generates a Fan Fault and
sends a Fan LOCK fault out on CN7 (5VDC). CN7 wires out to the Main
SMPS at CN8, CN9 and/or CN15. When only one fan is connected to this
fan board, the other connector (CN3 or CN4) pin 2 must be jumpered to
GND (pin 1) to avoid generating a Fan Fault.
CN4 (pins 1, 2 & 3) 24N-24P
CN5 (pins 1 & 2) 24P-24P1 Pin 2 (24P1) sends 24 VDC from the fan board out to Main SMPS at pin 1
of CN5, CN6 or CN16 through a contact of the fan control relays RLY2,
RLY3, RLY4. The relays are controlled by a fan control circuit on the Main
SMPS board. From the Main SMPS (24P-A. -B, -C), the 24 VDC then
comes back to each of the Fan Boards on pin 1 (24P) of CN5. 24P is
paralleled to pins 3 of CN3 and CN4. 24P from each fan board can power
up to 2 fans from CN3 and CN4.
CN7 (pins 1 & 2) 5VDC Fan Lock fault output to Main SMPS at CN8, CN9 or CN15.
LED1 Power, DC Bus keeps this lit until discharged.
Pub. # 890046-10-00
Dec. 2015
Section 3, Page 15 of 20