Chapter 7, Alarm relay configuration, Number of alarms – Watlow Series 922 User Manual
Page 63: Alarms, How to use the series 922 alarms - chapter 7, Chapter 7 how to use the series 922 alarms
How To Use The Alarms, Chapter 7
63
WATLOW Series 922 User's Manual
Alarms
Chapter 7
How To Use the Series 922 Alarms
One of the most versatile features of the Watlow Series 922 is its capability for
alarms. The alarms can be automatic signals for process error or temperature
related event-type actions in your system.
To use the alarms to their fullest extent, you need to understand what they are
and what they will do. Here's an overview of the different alarm parameters
again. Although you may already be aware of the alarms, notice how these
parameters interact.
Alarm Relay Configuration
Series 922 alarm relays are configured to de-energize when the ACTUAL value
is beyond the alarm limits. Normally open contacts are thus closed when tem-
peratures are "OK." That way alarm conditions exist if power is lost from the
control.
Number Of Alarms
There are two alarms in the Series 922, ALARM 1 and ALARM 2. These parame-
ters indicate an alarm condition, or a de-energized alarm relay with a flashing
ALRMX - XX in the alphanumeric display. By retaining the indication of a previ-
ous alarm condition, an operator absent from the control panel can be aware that
an alarm occurred. We'll look more closely at that in a few minutes.
Alarm 1 will only respond to Channel 1 and Alarm 2 only responds to Channel 2.
NOTE: If your unit
does not have an
external output
board, or it's not
connected, this
section does not
apply to your unit.