INS #
Application Note
Room Controller accessory
power allocation
Overview
The Room Controller low voltage interface ports provide +24 VDC to power the Keypad(s), Slider Station,
Daylight Sensor and Occupancy Sensors(s). The number of low voltage accessories that can be connected
to the RJ45 connectors is limited by the maximum amount of power that is available on the low voltage
ports. The following information in this application note provides guidelines for alternate combinations of
the low voltage accessories while staying within the maximum power limits.
Technical Details
A mix of control accessories can be used by the lighting system designer while at the same time staying
within the limits of the Room Controller low voltage power outputs. The maximum allowed combined DC
current draw for external Room Controller accessories is 90mA, which is based on industry guidelines and
testing. Table 1 below shows the current draw of various accessories that could be used in a particular
application.
Table 1. Maximum Current Consumption of Various Accessories
Accessory Max Current Consumption (mA)
Keypad 3.00
Slider 2.00
Daylight Sensor* 8.00
Occupancy Sensor, PIR 10.00
Occupancy Sensor, Dual Tech 25.00
Network Node 18.00
*One daylight sensor is allowed per Room Controller panel
– continued on reverse
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Eaton’s Cooper Controls Business
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Printed in USA
Publication No. ACC140066
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of their respective owners.
Example
Table 2 below illustrates how a variety of accessories can be used while staying within the current limitations of the system.
Table 2. Total Current Consumption of Various Accessories at Maximum Capacity
Qty Accessory Max Current Consumption (mA) Qty X (Max Current (mA))
2 Occupancy Sensor, Dual Tech 25.00 50.00
1 Slider 2.00 2.00
1 Daylight Sensor 8.00 8.00
4 Keypad 3.00 12.00
1 Network Node 18.00 18.00
TOTAL 90.00