TM 9--2350--292--20--1
0178 00--1
WINCH ELECTRICAL SYSTEM OVERVIEW AND DIAGRAMS.
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THIS WORK PACKAGE COVERS:
Winch Electrical System Overview And Diagrams
The electrical system for the main winch consists of a 20--amp circuit breaker, two level winder warning switches,
two winch drum warning switches, a payout limit warning switch, a payin solenoid valve, a WINCH OVERRIDE
switch, A LEVEL WINDER MALFUNCTION indicator, a WINCH DRUM MALFUNCTION indicator, a PAYOUT LIM-
IT indicator, seven diodes, a 15--amp circuit breaker, and related electrical wiring. With the main engine running
and the MASTER switch set to ON, system power (+28 V dc) is supplied to the winch electrical circuits in the hy-
draulic control panel. and through a 20--amp circuit breaker in the switch panel to warning switches on the winch.
The winch electrical system detects level winder drum malfunctions and the payout limit of the main winch wire
rope. The LEVEL WINDER MALFUNCTION indicator lights if an improper alinement of the wire rope is detected.
Likewise, the WINCH DRUM MALFUNCTION indicator lights if an irregular wrapping sequence onto the winch
drum is detected. The PAYOUT LIMIT indicator lights if less than four wraps of the wire rope remain of the main
winch drum. When any of these conditions are detected, main winch operation is automatically shut down and the
SYSTEM WARNING indicator is lit. If the main engine is running, the warning horn will also sound.
The WINCH TEST switch is used to check the automatic shut down procedure. When the switch is held in the
TEST position, solenoid valves are engaged to stop main winch operation and light the SYSTEM WARNING indica-
tor.
The WINCH OVERRIDE switch temporarily restores winch operation after an automatic shut down to permit the
operator to payin or payout the wire rope to correct the malfunction and complete winching operation.
The relationship of the winch electrical components is shown in the following diagram.
