Advance acoustic Convertamatic 24C, Service Manual

Page: 63 / 77

FORM NO. 56043098 - Convertamatic
™
24C, 24D, 26C, 26D, 28C, 28D - 61
ELECTRICAL SYSTEM
OUTPUT CONTROLS (CONTINUED):
Scrub On Switch (I):
This switch is used to control the output to the scrub deck lift actuator. Pressing and releasing this switch will cycle the actuator output through 4 states. These
are:
1 – Output off, direction = up
2 – Output on, direction = down (Display will show down arrow)
3 – Output off, direction = down
4 – Output on, direction = up (Display will show up arrow)
When the output is in state 1, the actuator output is turned off. The scrub pressure decrease indicator should be off. If the indicator is fl ashing green, this indicates
that the control is sensing current fl ow through the actuator (shorted output driver, control error). If the scrub pressure decrease switch was the last switch pressed, it
is possible to momentarily activate the actuator output using the wand switch. This can be used to jog the actuator to allow precise positioning of the actuator. NOTE:
the actuator can only move in this situation if it is not at its up limit.
When the output is in state 2, the actuator output is turned on. The scrub pressure decrease indicator should be green or fl ashing green. The indicator will be a
steady green if the control senses current fl ow through the actuator. It will fl ash green if no actuator current fl ow is sensed (actuator at limit, open circuit, open output
driver). The wand switch has no effect in this state.
When the output is in state 3, the actuator output is turned off. The scrub pressure decrease indicator should be off. If the indicator is fl ashing green, this indicates
that the control is sensing current fl ow through the actuator (shorted output driver, control error). If the scrub pressure decrease switch was the last switch pressed, it
is possible to momentarily activate the actuator output using the wand switch. This can be used to jog the actuator to allow precise positioning of the actuator. NOTE:
the actuator can only move in this situation if it is not at its down limit.
When the output is in state 4, the actuator output is turned on. The scrub pressure decrease indicator should be green or fl ashing green. The indicator will be a
steady green if the control senses current fl ow through the actuator. It will fl ash green if no actuator current fl ow is sensed (actuator at limit, open circuit, open output
driver). The wand switch has no effect in this state.
Vacuum Switch (C):
This switch is used to toggle the state of the vacuum motor. Pressing and releasing this switch will alternately turn the vacuum motor on and off. The indicator
provides the following status information:
Off - Vacuum motor output is off and there is no vacuum motor current sensed.
Steady Green - Vacuum motor output is on and there is normal vacuum motor current sensed.
Brief On Green Flash – Vacuum motor output is off and vacuum motor current is being sensed (abnormal condition).
•
Check for voltage at the Blu wire on K2 contactor to battery ground.
•
If any voltage is present, replace K2 contactor.
•
NO voltage, replace the Main control board.
Brief Off Green Flash – Vacuum motor output is on and vacuum motor current is not being sensed (abnormal condition).
•
Check Vacuum Motor wiring plug, disconnection.
•
Check for voltage at the Red wire on K2 contactor to battery ground. If no voltage is present repair the Red wire.
•
Check for voltage at the Blu wire on K2 contactor to battery ground. If no voltage is present replace the K2 contactor.
•
Check the Blu wire of the main harness connector at the vacuum motor to battery Negative. If no voltage repair or replace wire.
•
Check the Blk wire of the main harness connector at the vacuum motor to battery Positive. If no voltage repair or replace wire.
Flashing Yellow – Vacuum motor overload has occurred.
•
Check for an open in the small ORG current sense wire.
•
To confi rm an overload, disconnect the motor plug from the main harness, run a 30 amp fused test leads from the batteries to the motor and perform an Amp
draw test. Normal current load 24V 23-25 Amps.
•
Check for debris in the vacuum motor.
•
Worn carbon brushes.
•
Defective motor bearings.
•
Check for short circuit* in vacuum motor or wiring. Repair or replace
revised 8/06