Product Description:

The 502-03840-03R1 module is an analog and encoder interface board manufactured by Kollmorgen for the PIC900 Drives series. Installed inside a drive rack, the board routes precision reference signals from the controller to the power stage and returns position feedback from incremental encoders. By translating digital motion commands into differential analog voltages and counting returned pulses, it supports closed-loop speed and position control in industrial automation cells, packaging lines, and material handling axes. This arrangement lets the rack separate low-level command processing from motor power conversion while keeping signal exchange direct and organized. Its construction matches the electrical and mechanical format of other PIC900 cards, so additional axis capability can be added without reconfiguring backplane wiring.

Each analog output section provides 4 channels that share a 16 bits digital-to-analog converter, giving fine setpoint granularity. Signals are refreshed every 32 µs, so velocity or torque references track command changes with minimal lag. At a nominal swing of ±11 VDC, the outputs can source or sink up to ±10 mA, permitting direct connection to most servo amplifiers without external buffers. Differential analog signaling also helps reduce the effect of electrical noise in cabinets that contain switching devices and densely packed control wiring. The converter holds voltage within ±5% of the set level over temperature, while an output ripple of 10 mVRMS at 30 kHz keeps noise below typical drive input thresholds. When all channels and encoders are active, the board dissipates 7.4 W into the field power rail.

Position feedback resources complement the analog section. Three encoder input lanes accept single-ended or differential signals up to 500 kHz for pulse encoders and 250 kHz when operating in quadrature, with reliable edge detection down to a 0.6 µs pulse width. A 24-bit counter stores accumulated counts for rapid readback, which helps the controller compare commanded motion with actual shaft movement during continuous operation. The onboard encoder supply can deliver 22 mA @ 7 VDC, matching many TTL or 1 Vpp transducers, while the fast digital inputs tolerate field levels to 30 VDC without damage. Support for both single-ended and differential signaling allows the board to work with a broader range of encoder output styles without additional signal-conditioning hardware.