www.jbj.co.uk/electromagnetic-clutches.html 13 Electromagnetic Clutches Soft Start Controller The patented ‘SoftStart’ controller senses the exact point at which the friction surfaces contact, then rapidly reduces the current to a level that allows the clutch to safely slip, but not release. Using engine RPM feedback, the patented controller adjusts the clutch current in a manner that drives the engine RPM to a fit a desired profile. Design Features: » Closed loop control for consistent performance throughout the entire clutch life. » Precise current measurement for accurate and repeatable pull-in detection. » Closed loop PWM current control unaffected by charging system voltage. » One control ler part number ~ Rat io-metric RPM control automatically scales to RPM at time of engagement. On-the-fly current calibration automatically adapts to different sized clutches. » Default to open loop control if RPM signal is unavailable. » Optional fixed current calibration possible for special applications. » Optional open loop available (no tachometer feedback). » Short circuit protected / Load dump protected. Operating and Environment Specs: » Operating Temperature Range: -40° to +70°C. » Vibration: 20gs@10 to 80 Hz SAE J-1378. » Shock 55gs SAE J-1378 (tested and passed to 150gs, nearly 3 times the SAE specification!) » Humidity: 95%HSAE J-1378. » Salt Spray Test: MIL-STD-202G, Method 101E (5%NaCl @35C, 48 hrs). » Dust: Unit is 100%encapsulated ~ dust cannot enter. » Immersion:ASAEEP455 5.6 level 2. Immerse controller in tap water at temperature of 18C +/- 5C to a component top surface depth of 460mm. Orient in each of 3 orthogonal planes for 5 min in each plane. Upon removal, immediately subject to a cold soak of 19°C for 30 min. Return to dry atmosphere of 25°C for 60 min. No impaired function, no water entry. Ultraviolet: Q-Sun Xe-1-UVChamber to 720 Hours. » Thermal Shock: Controller stabilized at 70°C for 30 min. Removed from oven and immediately immersed in 0C water mixed with UV sensitive dye for a minimum of 5 minutes - repeated for a total of 10 cycles. Controller stabilized at -40°C for 30 min. Removed from chamber and immediately immersed into 25°Cwater mixed with UV sensitive dye for amini-mumof 5min - repeated for a total of 10 cycles. No functional failures or ingress of water. » Chemical:ASAEEP455.5.8.2 chemicals brush exposure. » Chemical test: Apply with a brush over the normally exposed surface area. Repeat once per day for three days. Check for impaired function or detrimental corrosion during the test and at the end of a 100 hour minimum interval following exposure to test condition. No defect from wiping the surface with the following chemicals at room temperature: engine oil, transmission fluid, gasoline. #DriveLineHarmony Electrical connection Gas Powered, Diesel or Electric Versions PIN OUT A Ground. B +12VDC Supply. C Clutch OUT + D Clutch RETURN. E RPM Tachometer trigger (for closed loop versions). Inductive for gas equipment, alternator output for diesel, other pickup options available. OEM Options » Other tachometer feedback (rotating shaft, controller interface, etc.). » Open loop soft start version with no tachometer feedback. » Voltage input options. » Multiple clutch engagement and tachometer profiles.
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