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Ac Fail Relay; Ground Fault Detection Enable/Disable - Siemens PAD-3 Installation, Operation And Maintenance Manual

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2.5.7

AC Fail Relay

AC Fail Relay provides a normally open (N.O.) Form "A" contact which will be de-energized without delay
if AC is low or lost. It provides a local signal (audible and visual) of AC fail at the protected premises but
will not cause the DACT to signal.
FS-250
LOOP CKT
TB3
1+
1-
2+
2-
TB12
1+
1-
2+
NOTES:
2-
1. Program HTRI-S #1 as Status causing, which will not cause the DACT
TB13
to signal but will cause local visual and audible signal. It provides a local
3+
signaling of AC fail at the protected premises.
3-
4+
4-
2. Program HTRI-S #2 as Trouble causing, which will cause the DACT to
signal for all common troubles (including AC fail with reporting delay).
Figure 2-12. AC Fail Relay Connection Example

2.6 Ground Fault Detection Enable/Disable

For some applications (when used with RSA-Series annunciators, for instance), the PAD-3 is used to
provide power to an auxiliary device which gets a control signal from a fire alarm panel. The ground fault
reference for the PAD-3 may be different than the reference used by the fire alarm panel, resulting in a
ground fault trouble at the panel even when none exists. To remedy this condition, the PAD-3 can have
its ground fault detection circuit disabled. Once disabled, the fire alarm panel's ground fault detection
circuitry will detect any ground fault in the system. See Section 5-2 for correct positioning of this jumper,
and see Figure 2-2 for the location of this jumper.
PAD-3
Trouble
AC Fail
Input 1
Input 2
Relay
1
2
3
4
5
6
7
8
9
10 11
*
*
EOL 24K
EOL
EOL
½W 5%
P/N 140-820405
FS-DLC LOOP
HTRI-S
#1
NAC
12 13 14
*
EOL
3.6K, 1/4W
P/N 140-830185,
or
470 OHMS, 1/4W
P/N 140-820164,
as applicable
HTRI-S
#2
16

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