Rockwell Automation 2100 CENTERLINE Smoke Detector Unit - Manual (Page 3)

Publication 2100-IN046B-EN-P—November 2001
CENTERLINE Motor Control Centers Bulletin 2100 Smoke Detector Unit 3
block points 2 and 3) to open and prevents the “SMOKE ALARM” pilot
light from illuminating.
When the alarm is activated, the control relay (SR) drops out, closes
the normally closed contact (terminal block points 2 and 3), and
illuminates the “SMOKE ALARM” pilot light.
The circuit provides three (3) auxiliary control relay (SR) contacts: two
(2) normally open (N.O.) contacts (terminal block points 2 and 5 and
points 9 and 11) and one (1) normally closed (N.C.) contact (terminal
block points 9 and 10). These may be used for remote alarm
indicators.
Note: If there is a loss of the separate 120 volt, 60 Hz, AC power
source, the relay will drop out, the N.C. contact will close, and the
N.O. contact will open. However, the “SMOKE ALARM” pilot light will
not illuminate. In the remote possibility of internal DC power loss, a
fail-safe condition will occur; that is, the N.C. contacts will close, the
N.O. contacts will open, and the “SMOKE ALARM” pilot light will
illuminate, but the “DC POWER ON” pilot light will not illuminate,
thus indicating a loss of DC power.
To activate the smoke detector unit, turn the smoke detector switch
clockwise to the “ON” position.
Note: The unit must be in the “OFF -RESET-” position for at least 20
seconds before turning the switch to the “ON” position, or a false
alarm may occur.