SM4A1S Smooth-Move Soft-start Controller

4 Amp. capacity used on motors of 2 HP @ 480 Volts or 1 HP @ 230 Volts, Smooth-Move Speed transitional A.C. soft start, reduced torque control.

Upgrade your crane with smooth starting, reversing, jogging, more precise spotting, and inching. Controls all 3 phases for lower mechanical and motor stress. Increase the life, reliability, and productivity of new or existing motorized equipment.

• Solid-state voltage ramp control that gradually applies torque to eliminate dangerous load swings
• Compact footprint allowing quick retrofit mounting inside existing crane electrical panels
• Adjustable initial voltage and ramp-time trimpots for tailored motor acceleration response

Eliminate structural torque shocks and hard startup shifts on your overhead crane motors with the Smooth-Move Soft-Start Motor Controller (SM4A1S). This solid-state voltage regulator smooths out heavy initial motor current surges, keeping structural frame components and gear teeth from grinding or chipping. Highly recommended for facilities looking to soften mechanical tracking actions without installing a complex, full-scale VFD cabinet.

Installing the SM4A1S soft start controller delivers immediate mechanical relief to your drive assembly during start-stop cycles. Utilizing a Smooth Move crane controller ensures your trolley and bridge travel smoothly without jarring structural welds or shifting sensitive suspended loads. This reliable electric hoist motor acceleration regulator provides a cost-effective alternative to full drive retrofits, and equipping your panel with this crane soft starter device from Electric Crane & Hoist extends the operational life of your entire drive train. Order today.

• Built-in transient surge protection safeguarding solid-state electronics from voltage spikes
• Reduced starting current draw that minimizes peak electrical demand across facility lines
• Thermal overload protection preventing motor overheating during frequent inching operations