Document No: LT0122

F3200 Installation & Programming Manual

 

Installation & Wiring

8.6.1DUAL POLE – POLARITY REVERSAL OUTPUT

Two relays; or 1 relay, an open collector output and an external 2 pole relay (e.g. PA0730); can be arranged to provide a supervised dual-polarity output suitable for driving dual strobes (Alert and Evacuate) or some visual warning devices (e.g. an AVI). The output is normally off (supervising voltage only), but can turn on with 24V in one polarity or in the other polarity. This is shown in Figure 8.6.2.

If the dual pole relay is a second 8RM relay then the additional connector blocks need to be fitted (CN0260 and CN0488). Supervision is not enabled on this relay. The supervision on the other relay will detect any short circuit, but may not detect an open circuit with multiple sets of strobes/AVIs. This will depend on the type of strobe/AVI and the quantity remaining connected.

The relay should be programmed to operate when either strobe is required, and the open collector output (or 2nd relay) is programmed to operate for Evacuate.

Note that many strobes have a large capacitor inside them that causes a large in-rush current at power on. Therefore it may be necessary to add some series resistance if the cable length to the first set of strobes is not enough to limit the current. Add 10-20 ohms for a total strobe current of <100mA, 8-10 ohms for 100mA, and 2 x RR1007 NTCs in series for 300mA-1A.

+24V

NC NO

Relay 1

C

Supervision Input

 

 

NO

 

+

NC

Open

 

-

NO

Collector

 

 

 

NC

 

 

0V

Dual Pole Relay

(PA0730 or 8RM)

C

 

 

EVAC-

Alert +

 

AVI

 

ALERT-

 

Evac +

 

 

C Strobes

4k7

FIGURE 8.6.2

DUAL POLARITY OUTPUT FOR STROBES/AVI

Issue 2.7

5 July 2001

Page 8-21

Page 159
Image 159
Tyco F3200 manual Dual Pole Polarity Reversal Output, Dual Polarity Output for STROBES/AVI

F3200 specifications

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