Yamaha GX-900 Service Manual page 26

GX-900
HOME operation
Start
LOAD MOTOR reverse rotate
NO
LOAD SW
OFF ?
YES
TIMER 10ms
NO
LOAD SW
OFF ?
YES
LOAD MOTOR forward rotate
NO
LOAD SW
ON ?
YES
TIMER 10ms
NO
LOAD SW
ON ?
YES
LOAD MOTOR STOP
END
OPEN operation
Start
10sec timer start
LOAD MOTOR reverse rotate
NO
UNLOAD SW
OFF ?
YES
TIMER 10ms
NO
UNLOAD SW
OFF ?
YES
LOAD MOTOR STOP
END
25
NO
10sec timer
time up ?
YES
LOAD MOTOR STOP
ERROR
CLOSE operation
Start
10sec timer start
LOAD MOTOR forward rotate
NO
LOAD SW
ON ?
YES
TIMER 10ms
NO
LOAD SW
ON ?
YES
LOAD MOTOR STOP
END
DOWN operation
Start
10sec timer start
LOAD MOTOR forward rotate
NO
DOWN SW
ON ?
YES
TIMER 10ms
NO
DOWN SW
ON ?
YES
END
NO
10sec timer
time up ?
YES
LOAD MOTOR STOP
To OPEN operation
NO
10sec timer
time up ?
YES
LOAD MOTOR STOP
ERROR