Contemporary Control Systems EISC Configurable Switches User Manual - Manual (Page 12)

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5.1.2
Connecting to Power
The EISC requires power via its four-pin connector. The
keyed plug is removable and is included with the switch.
The applied voltage may be either AC or DC. For power
requirements, consult the
specifications . Conductors in
the range of 12–24 AWG are secured in the plug by
screw terminals. The various power options are
explained below.
NOTE: This device is intended for use with Class 2
circuits.
Figure 3 — The Power Connector
5.1.2.1
DC Powered
The EISC accepts a voltage range of 10-36 VDC and draws a value of current
commensurate with 12-watt power consumption. Power conductors should be sized
accordingly. Ground is directly connected to zero volts and the equipment chassis is
isolated from zero volts. The input connections are reverse-polarity protected.
Figure 4 — DC Powered
5.1.2.2
Redundant DC Powered
Redundant diode-isolated DC power inputs are provided so the EISC can operate
despite the loss of primary power. Both sources must provide 12 watts of power.
Figure 5 — Redundant DC Powered