22
ACS Manual —
P/N 15842:
N3
5/4/2022
Installation, Configuration, and Programming
Earth Ground
5.8 Earth Ground
Connect Earth Ground to a mounting screw on the backbox or cabinet. During mounting (see Section 5.3), the backbox or cabinet should
have been connected to a solid earth ground such as a cold water pipe.
•
ACM-24AT, ACM-48A: Ground is on the EIA-485 terminal block.
•
ACM-16AT and ACM-32A: Ground is on the Power terminal block.
5.9 Main Power Supply Connections
The ACS power source must be filtered, non-resettable, 24 VDC listed for fire-protective signalsignalingling use. Sources include main
power supplies, auxiliary power supplies, and on-board power supplies (integral to fire alarm control panel).
The power run to the annunciator need not contain a Power Supervision Relay because loss of power is inherently supervised through com-
munication loss (loss of EIA-485 communication is registered at the control panel during loss of power to the annunciator).
See accompanying figures for power supply diagrams:
•
Figure 5.13, “Power Circuit for ACM-24AT and ACM-48A”
•
Figure 5.14, “Power Circuit for ACM-16AT and ACM-32A”
For details about connections to particular control panels, see the appropriate appendix in this manual.
NOTE:
All power must be turned off when connecting the 24 VDC power to the annunciator. Reapply power according to the instructions in
your control panel manual.
+24 VDC In
+24 VDC Out
Reference Out
Reference In
Note:
On ACM-24AT and ACM-48A, earth ground is on TB1 with
the EIA-485 connection.
Figure 5.13 Power Circuit for ACM-24AT and ACM-48A
24 VDC Power
(filtered, non-resettable, listed for
fire-protective signaling use)
A
C
M
-2
4
-4
8
-p
w
r.
w
m
f
+24 VDC In
+24 VDC Out
Reference Out
Reference In
+24 VDC In
+24 VDC Out
Reference Out
Reference In
TB2 power supply
TB2 power supply
TB2 power supply
Figure 5.14 Power Circuit for ACM-16AT and ACM-32A
TB1
A
C
S
1
6
-3
2
-p
w
r.
w
m
f
TB1
TB1
jumper for
supervisory
devices (see
Section 5.14)
24 VDC Power
(filtered, non-resettable, listed for
fire-protective signaling use)
N.C. Trouble Inputs
N.C. Trouble Inputs
Common In
Common Out
Power In
Power Out
Earth Ground
N.C. Trouble Inputs
N.C. Trouble Inputs
Common In
Common Out
Power In
Power Out
Earth Ground
N.C. Trouble Inputs
N.C. Trouble Inputs
Common In
Common Out
Power In
Power Out
Earth Ground