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

Page: 69 / 116

Part # HP Where Used Description
Fan SMPS Board
PC-100023-00 50 - 125
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 contact) then returned to the fan board
to power up to 3 fans.
Fuse, 1A, 600V, 100Kaic. Fast
Acting
FU-603 All
Connector ID Terminals Descritpion
CN1 (pins 1 & 4) DCP-DCN DC Bus Voltage into board
CN2 (pins 1 & 3) P6-G6 6 VDC out to Main SMPS CN43
CN3 (pins 1 & 3) 24N-24P 50 - 125 HP - 24VDC Connectors CN3, CN4 & CN5 are all parallel
out of the fan board to power up to 3 fans. The number of fans
depends on the size of the VFD. Some fans have a center wire used
for fan monitoring going to pin 2 of these connectors. This fan board
does not have a fan monitoring circuit. Pin 2 is not used.
CN4 (pins 1 & 3) 24N-24P
CN5 (pins 1 & 3) 24N-24P
CN6 (pins 1 & 2) 24P-24P1 Pin 2 (24P1) sends 24 VDC out to Main SMPS board CN40, pin 1.
24 VDC goes through a contact from the fan control relay (RLY2) on
the Main SMPS board. The relay is controlled from a fan control
circuit on the Main SMPS board. 24 VDC exits the Main SMPS
board from CN40 pin 2 as 24P. The 24 VDC then comes back to Fan
board on 24P (CN6). This 24P is paralleled to CN3, CN4 and CN5
as 24P-24N which powers the (up to 3) fans.
LED1 Power, DC Bus keeps this lit until discharged.
Pub. # 890046-10-00
Dec. 2015
Section 3, Page 7 of 20