Use of normally closed contacts, Use of normally closed contacts -32, 5 use of normally closed contacts – Tyco F3200 User Manual
Page 202
F3200 Installation & Programming Manual
Document No: LT0122
Applications
Page 9-32
5 July 2001
Issue 2.7
9.5
USE OF NORMALLY CLOSED CONTACTS
There may be some situations where it is necessary to monitor a set of normally-closed
contacts which open on "alarm".
As standard these cannot be wired directly to the F3200 AZC terminals.
The Vigilant Contact Conversion Module (part number PA0443) may be used as a
conversion interface between the contacts and an F3200 AZC.
This small, encapsulated module has three wires protruding from it.
These must be connected between the normally closed contact and the AZC as shown in
Figure 9.5.1, using suitable screw terminal blocks.
The module applies a low impedance to the AZC when the alarm contacts open, and so the
circuit must be programmed as B1 = Alarm.
FIG 9.5.1
NORMALLY CLOSED CONTACT WIRING TO F3200 AZC