NSD Mat Controllers

Circuit Description
A low voltage (24VAC or 24VDC) signal is sent out to the safety mat(s) through two wires. Two special optically-isolated diverse redundant circuits look at the signals coming back from the mat(s) detecting the presence of proper positive and negative voltage (AC) levels and output their signals to redundant missing pulse detectors. If the voltage coming back is too high or low, the missing pulse detectors will drop out and de-energize the relay circuit. If the voltage coming back is not AC (missing either positive or negative peaks), then the signal going to the missing pulse detector will disappear which will, in turn, drop out and de-energize the relay circuit.

Redundant relay position detectors watch for a relay contact stuck in the wrong position. The circuits will lock out the reset feature of the NSD control unit if a relay contact is closed when it should be open.

Each relay has its own driver circuit to complete the redundancy of the circuits.

Controller Dimensions

Metal Box Controller
Board Only: Model NSD-TR-BO - 5" (127mm) x 7: (178mm) plate with 4 holes 4.25" (108mm) x 6.25" (159mm) on center

Controller:
Model NSD-TR-01 = 1 Zone - 8" (203mm) x 6" (152mm) x 3.5" (89mm) with 4" (102mm) x 8.75" (222mm) holes
Model NSD-TR-02 = 2 Zones - 12" (305mm) x 10" (254mm) x 5" (127mm) with 8" (203mm) x 12.75" (324mm) holes
Model NSD-TR-03 & TR-04 = 3 & 4 Zones - 16" (406mm) x 14" (356mm) x 6" (152mm) with 13" (330mm) x 16.75" (425mm) holes

DIN-rail Controller -- Model NSD-DR-01
5.87" (149mm) length x 4.33" (110mm) width x 2.95" (75mm) height

DIN-rail Controller with Diagnostics -- Model NSD-DR-04
5.87" (149mm) length x 4.33" (110mm) width x 2.95" (75mm) height.

DIN-rail enclosure mounting: 35mm DIN-rail mountable or mounting screws on corners of enclosure requiring two combo-head screws (3.5mm x 0.6mm x 14mm or #6 x.5)

Specifications