Auxiliary Power Supply Output; Common Trouble Relay - Siemens PAD-3 Installation, Operation And Maintenance Manual

2.5.5

Auxiliary Power Supply Output

The auxiliary power supply output provides a 24VDC power source. It is unsupervised and power limited.
For applications where the battery charger circuit charges batteries of 7.0 A.H. or less, or if the battery
charger is disabled, this output is limited to 3.0 amps maximum. For batteries between 15 A.H. and 7.0
A.H., this output is limited to 1.5 amps maximum.
Figure 2-10. Auxiliary Power Supply Output Connection
2.5.6

Common Trouble Relay

The PAD-3 board has a Form C trouble relay built into terminals 9-11 of TB2. The trouble relay will de-
energize under a trouble condition.
A typical application of the trouble relay is to connect the PAD-3 normally closed (N.C.) contacts in series
with an EOL of a spare IDC or NAC or monitor input from a fire alarm control unit. This will cause a
trouble on the fire alarm control unit when the PAD-3 opens its trouble contacts.
The common trouble relay will be de-energized after selectable delay (60-180 minutes, refer to Section
5.1.4) if AC is low or lost.
Note: The N.C. contact is the relay contact that is closed when the PAD-3 has power and there are no
trouble conditions.
Input 1 Input 2
AC Fail
1 2 3 4 5 6 7
TROUBLE RELAY CONTACT
(SHOWN IN NORMAL
STANDBY CONDITION)
5A @ 30VDC/VAC,
RESISTIVE FOR POWER
LIMITED SOURCE
UNSUPERVISED
Figure 2-11. Trouble Relay Connection Example
AUXILIARY POWER OUTPUT
3A MAX., 18-28 VDC
(REFER TO SECTION 1.3 GENERAL SPECIFICATIONS)
UNSUPERVISED, POWER LIMITED
Trouble
Relay NAC NAC
8 9 10 11 12 13 14 15
N.C. COM N.O.
INITIATING CIRCUIT
IDC EOL
(SEE CONTROL UNIT
INSTALLATION INSTRUCTIONS)
TB2
AUX
P.S.
CONTROL UNIT
IDC
CONNECTION
+
-
15