Nilfisk-Advance SC500 Service Manual

Also see for 9087350020: Service manual Service manual

Contents

Nilfisk-Advance SC500 Service Manual Manual pdf 79 page image

Scrub System, Disc 77Service Manual – SC500Brush Deck Actuator SystemThe 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 systemto control the actuator. Basically the system uses deeply measurements of the current flow in the actuator toknow its position in real timeThe 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 forceThe actuator moves and stops in 3 defined positions:1 RETRACTED: fully retracted end of stroke (deck lifted)2 WORK: intermediate position (deck on the floor, normal work condition)3 EXTRAPRESSURE: fully extended end of stroke (deck on the floor with extrapressure given pressingthe actuator integrated spring)The actuator is powered at 50% PWM (about 12Vdc) near the end of strokes or during the machine switch-onreset 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 positionThe quotes of the actuator strokes, with a tolerance of ±2mm are: stroke RETRACTED-WORK = 3 3 in (85mm), 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 TimeoutExtrapressure 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 theactuator reaches the end ofstroke)Reset (during machine switch on) 50%(=12Vdc) 2A per Time>1sec. Not (board assumes theactuator reaches the end ofstroke)25 sec.