Fisher HT Series - Raise Function: Electrical Operation; Raise System Electrical Response

Lit. No. 41298, Rev. 01 February 15, 2019
43
RAISE – ELECTRICAL
Plow Module
4A Fuse: Motor
Relay
4A Fuse: S1, S2, S3
Pump
Motor
Motor
Relay
GG
A
A
A
B
C
E
D
F
B
C
D
E
F
H
KK
H
JJ
A
B
A
GG
B
D
C
F
E
D
B
C
F
E
H
KK
H
JJ
Wire Side View
10-Pin Connector
C
WHT
TAN
BLK
RED
RED
RED
S1
S2
S3
BLK
RED
RED
WHT
GRN
BLU
RED
12V
COM
12V
M/R
S2
S3
S1
12V
E
D
B
C
A
F
G
J
H
K
+
–
BLK
RED
System Response
1. By activating the RAISE function on the cab
control, the control sends a signal to the Plow
Module to complete the ground path for the
electrical circuit, activating the motor relay and
solenoid cartridge valve S3.
2. Hydraulic fl uid from the pump fl ows through the
activated S3 and unactivated S2, through the
internal check valve in S1, into the rod end of
the lift ram, causing it to retract. At the same
time, hydraulic fl uid is being forced out of the
base of the ram, through the scrape lock (RV4)
relief valve, and returned to the reservoir.
NOTE: Battery voltage is supplied to the Plow
Module, the motor relay, and the three solenoid
coils when the snowplow is connected to the
vehicle.