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

Page: 71 / 116

Fan Board Circuit, PC-100023-00
50 – 125 HP, 460V
Description
24 VDC
The fan board generates 24 VDC from a switch mode power supply on the fan board.
This 24 VDC is sent to the Main SMPS board as 24P1. At the Main SMPS board, the
24P1 passes through contacts of the fan control relay (RLY2) and is returned to the fan
board as 24P. This 24V (24P) is used to power up to 3 fans per fan board from
connectors CN3, CN4 & CN5.
Pin 2 of CN3, CN4 & CN5 of this Fan Board has no connection. If a fan was provided
that has 3 wires, the middle wire is for a fan fault monitor. This Fan Board has no fan
fault monitoring. Pin 2 is an open circuit and has no connection into the board.
Operation of the Fan Control Relay is always ON when power is on. See parameters I/O-
84 and I/O-85 for other options.
Fan Bd. pin
CN6
CN5
CN4
CN3
24P1 (2)
24P (1)
24P (3)
(2)
24N (1)
24P (3)
(2)
24N (1)
24P (3)
(2)
24N (1)
Pin SMPS Bd.
CN40
RLY2
Fan Control Relay
(1) 24P1 •
(2) 24P •
Pub. # 890046-10-00
Dec. 2015
Section 3, Page 9 of 20