Ariens Path-Pro 136E User Manual download pdf (Page 54)

Chapter 7

How To Use the Series 920 Alarms

One of the most versatile features of the

Watlow

Series

920

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 920 alarm relays are configured to de-energize when the ACTUAL value

is beyond the alarm limits.

Normally

open contacts are thus closed when

temperatures are “OK.” That

way

alarm

conditions exist if power is lost from

the control.

Number Of Alarms

There are two alarms in the Series 920,

ALARM

1 and ALARM 2. They

indicate an alarm condition, or a de-energized alarm relay with a flashing

“ALMX

XX”

in the alphanumeric display. By retaining the

indication

of a

previous alarm condition, an operator absent from the control panel can be

aware that an alarm occurred. We’ll look more closely at that later in this

chapter.

WATLOW

Series 920 User’s Manual

How To Use The Alarms, Chapter 7

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