Honeywell CNI2 - Form-C Operation; Typical Form-A and Form-C (KYZ) Connections; Example of Detection of a Form-C Fault

CNI2
O
perating and Installation
Guide
111
FORM
-
C OPERATION
Typical
Form
-
A and
Form
-
C (KYZ) Connections
A Form
-
C (KYZ) switch is ofte
n used so that a defective switch or associated wiring can be
detected.
In the illustration a
larm sensing or pulse counting is performed on the “IN
PUT
-
1
”
connection only.
“IN
PUT
-
2” is used for fault detection.
The switches should never be
open or closed
at the same time. If so the
CNI2
will report an
alarm condition.
The next figure shows how a KYZ fault is detected.
Example of Detection of a Form
-
C Fault