Installation Leaflet
Page 17 Effective: April 2003
Pow-R-Command 100
IL01412003
For More Information visit www.cutler-hammer.com
APPLICATION EXAMPLE 4: CONNECTING
ENVIRONMENTAL SENSORS DIRECTLY
TO CONTROLLERS
Environmental sensors can be used by the
PRC100 system to provide limited security,
health and comfort control. By utilizing
temperature and humidity sensors equip-
ment can be protected from environmental
extremes. Additionally a CO
2
Sensor can be
used to monitor unsafe levels and in turn
control ventilators.
Fire, Security, or other dry-contact
The above illustrates connecting environ-
mental sensors directly to an SOC. It should
be noted that these connections could also
be made to the USC with the difference
being the location of the connectors.
The CO
2
Sensor shows all modes con-
nected. This sensor could provide direct
analog input (through the 250 Ohm resistor)
and can also provide closures determined
by an on-board threshold adjustment. While
it is not necessary to make all connections
they are shown here for an example.
Additional parameters are required for all
three sensors to condition the inputs to
usable values (type conversion). It is
absolutely necessary to provide the
sensor’s output characteristics to the
Cutler-Hammer engineer prior to start-up of
these devices.
Figure 4-19: Application Example SOC Switch Inputs
18-30V ac
RMS
7 - Signal COM
6 - 4-20 mA
5 - Relay NC
4 - Relay COM
3 - Relay NO
Telaire Ventostat
8000 Series
CO
2
Sensor
HI Solutions® 2922-2114
Humidity Transducer
0-5V dc
HI Solutions 2920-1700
10K @ 77 F Thermistor
USC
SOC
250 Ohm
Resistor
Fire, Security,
or Other Dry-
Contact
