Installation, Configuration, and Programming
32 PN 15842:K 7/23/2002
4.8 Earth Ground
Connect Earth Ground to a mounting screw on the backbox or cabinet During
mounting (see Section 4.3), 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.
4.9 Main Power Supply Connections
The ACS power source must be filtered, non-resettable, 24 VDC listed for fire-
protective signalling 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 communication 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:
• Section 4-13 “Power Circuit for ACM-24AT and ACM-48A”.
• Section 4-14 “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.
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