Scrub System, Disc 77Service Manual – SC500
Brush Deck Actuator System
The brush deck actuator of SC500 is a new generation actuator developed by SIR and ITALSEA and it is con-
trolled directly by the main board without electromechanical limit switches. ITALSEA patented the system
to control the actuator. Basically the system uses deeply measurements of the current ow in the actuator to
know its position in real time.
The actuator is mechanically proof of the end of stroke because of it reaches the end of stroke with limited volt-
age applied and so with a limited speed and force.
The actuator moves and stops in 3 dened positions:
1. RETRACTED: fully retracted end of stroke (deck lifted)
2. WORK: intermediate position (deck on the oor, normal work condition)
3. EXTRAPRESSURE: fully extended end of stroke (deck on the oor with extrapressure given pressing
the actuator integrated spring)
The actuator is powered at 50% PWM (about 12Vdc) near the end of strokes or during the machine switch-on
reset feature, otherwise at 100% PWM (24Vdc)
The machine switch-on reset feature moves the actuator from the position where it was the last time the ma-
chine was switched off to the RETRACTED position.
The quotes of the actuator strokes, with a tolerance of ±2mm are: stroke RETRACTED-WORK = 3.3 in (85
mm), stroke RETRACTED-EXTRAPRESSURE (end to end) = 4.7 in (120 mm).
There are time out limits and amperometric limits related to the different phases of the movement as follow:
Movement from: To: PWM AMP limit Alarm if AMP limit reached Timeout
Extrapressure Work 100% (=24Vdc) 4A per Time>1sec. Yes 7.5 sec.
Work Retracted –
0.4 in (10 mm)
100%(=24Vdc) 4A per Time>1sec. Yes 15 sec.
Retracted –
0.4 in (10 mm)
Retracted 50%(=12Vdc) 2A per Time>1sec. Not (board assumes the
actuator reaches the end of
stroke)
Reset (during machine switch on) 50%(=12Vdc) 2A per Time>1sec. Not (board assumes the
actuator reaches the end of
stroke)
25 sec.
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