Contemporary Control Systems EIS UL864-Compliant Switches - Manual (Page 4)

TD070500-0IC
4
Powering
The EISwitch requires low-voltage power — AC or DC — via a four-pin removable
keyed connector. Consult the specifications for power requirements. The various power
options are explained below.
NOTE: This device is intended for use with Class 2 circuits.
DC Powered
The EISwitch accepts a voltage range of 10–36 VDC and draws a current value
commensurate with 10-watt power consumption. Power conductors should be sized
accordingly. Circuit common is directly connected to zero volts and the equipment
chassis is isolated from zero volts. The input connections are reverse-polarity protected.
Figure 1 — DC Powered Figure 2 — Redundant DC Powered
Redundant DC Powered
Redundant diode-isolated DC power inputs are provided so the EISwitch can operate
despite the loss of primary power. Both sources must provide 10 watts of power.
AC Powered
The EISwitch can be powered by an AC voltage in the range of 8–24 V capable of
delivering 10 VA of apparent power. Two auxiliary power supplies are available:
The AI-XFMR is for use with 120 VAC. The AI-XFMR-E is for use with 230 VAC.
Figure 3 — AC Powered
Figure 4 — AC Powered
with Grounded Secondary
AC Powered with Battery Backup
The EISwitch can also operate in the AC mode
with a backup battery providing power if the AC
source fails. The EISwitch does NOT charge the
battery, so separate provisions are required for
charging.
Figure 5 — AC Powered
with Battery Backup
(Figure 1)
(Figure 2)
(Figure 3 and Figure 4)
(Figure 5)