Product Description:

The M4210-S821 is a digital DC drive produced by Kollmorgen within the M4000 Digital DC Drives series. The unit regulates field-wound or permanent-magnet DC motors in industrial automation cells by converting AC power into a controlled DC armature supply while also providing motion feedback and programmable logic support. Its internal processor samples current and velocity rapidly, allowing the controller to manage closed-loop armature voltage with low ripple in conveyor, winder, and test-stand axes that demand steady torque.

This drive accepts a supply at 230 VAC and draws up to 31.0 A under full load. After rectification, it provides 240 VDC to the motor armature, and the chopper stage supports a continuous armature current of 37.8 A for torque production. A balanced three-phase input connection limits neutral currents and simplifies mains cabling and protective device sizing. Because the power section is isolated from the low-level electronics, the chassis can be grounded without introducing common-mode noise, and an integral line reactor restrains inrush to protect upstream breakers.

The control layer offers a speed resolution of 0.025% through a 12-bit main analog input, while a secondary 10-bit auxiliary channel is available for trimming or load-sharing commands. Ten logic terminals accept 24 VDC signals, and each input can be assigned to forward, reverse, jog, or preset-speed functions, eliminating external relay banks; the same header routes RS485 traffic using the ANSI 3.28X protocol for networked parameter access. A quadrature encoder interface operates up to 200 kHz with 0.01 percent accuracy at 1024 ppr, enabling tight position loops directly inside the drive. During transient demands, the power stage tolerates 150% for 1 min of current, which supports a sustained mechanical output of 10 HP on demanding starts or tension spikes without derating.