System 500 Systems: ACM-16AT and ACM-32A Only
72 PN 15842:K 7/23/2002
(@16 AWG) between the
control panel and the furthest annunciator.
• Use twisted pair cable with a characteristic impedance of approximately
120 ohms.
• EIA-485 circuit rated 5.5 VDC max., 60 mA max.
Note: “System Trouble” and “Module Failure” will also occur if the normally
closed supervisory path between TB1 Terminals 6 and 7 on the annunciator is
opened (or the jumper has not been installed).
R.3 Providing Power to Annunciators
System 500 panels use the MPS-24B Main Power Supply. Connect the power
run for the ACS to MPS-24B TB2 Terminals 1 (+) and 2 (-).
No more than 200 mA current can be drawn from these power-limited terminals
in standby or alarm.
The power run to the annunciator does not require a Power Supervision Relay
because loss of power is inherently supervised through a Communications loss.
This 24 VDC output is filtered, regulated, power-limited, and non-resettable.
When not using the trouble input on annunciator or expander, jumper terminals
TB1-6 and TB1- 7 together.
!
WARNING: Cut JP1 to make this circuit non-resettable. Do not use this
connection to simultaneously power four-wire detectors and annunciators.
See the System 500 Manual for location of JP1.
P3
TB3
TB2
TB1
CB1
P2
R55
1 2 3 4 6 7 8
EARTH
AC NEUT
COMMON
COMMO N
BATT -
+2 4 VRESET
AC HO T
+24 VP OWER
BATT +
2 3 4
1 2 3 4
1 2
Mps24b_Inver.cdr
( - ) Common
TB2-2
24 VDC Power (+)
TB2-1
MPS-24B (Shown as Mounted in System 500)
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