Auxiliary Power Supply Output; Common Trouble Relay - Siemens PAD-4 Installation, Operation And Maintenance Manual

2.6.5

Auxiliary Power Supply Output

The auxiliary power supply output provides a 24VDC power source. It is supervised for ground fault and
short and is power limited. This output is limited to 3.0 amps maximum.
2.6.6

Common Trouble Relay

The PAD-4 board has a Form C trouble relay. The relay will de-energize under a trouble condition.
A typical application of the trouble relay is to connect the PAD-4 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-4 opens its trouble contacts.
For AC Fail reporting, refer to Section 5.1.4 for configuration and response times.
Note: The N.C. contact is the relay contact that is closed when the PAD-4 has power and there are no
trouble conditions.
1+ 1-
1
TB15
_
+ +
NAC3B NAC4B (NAC2A)
1
3A MAX., 24VDC, SPECIAL APPLICATION
Auxiliary Power Supply Output Connection
TB11 TB12
2
1 2+ 2- COM NC
1
INPUT 1 INPUT 2
TROUBLE RELAY CONTACT
(SHOWN IN NORMAL
STANDBY CONDITION)
2A @ 30VDC,
RESISTIVE FOR POWER
LIMITED SOURCE
UNSUPERVISED
Trouble Relay Connection Example
PAD-4 Installation, Operation and Maintenance Manual
TB16
_
_
+
AUX PWR SUPPLY
1
AUXILIARY POWER OUTPUT
(REFER TO SECTION 1.3
GENERAL SPECIFICATIONS)
SUPERVISED, POWER LIMITED
Figure 2-14
TB13
NC COM NO
1
INITIATING CIRCUIT
IDC EOL
(SEE CONTROL UNIT
INSTALLATION INSTRUCTIONS)
Figure 2-15
TB14
_ _
+ +
NAC1B NAC2B (NAC1A)
1
CONTROL UNIT
IDC CONNECTION
+
-
15