Dwyer MPCJR User Manual
Page 19
WARNING: IF INHIBIT IS ON AND A POWER FAILURE OCCURS DURING
A HIGH ALARM, RESTORATION OF POWER WILL NOT CAUSE THE
ALARM TO OCCUR IF THE PROCESS VALUE DOES NOT FIRST DROP
BELOW THE HIGH ALARM SETTING. DO NOT USE THE ALARM INHIBIT
FEATURE IF A HAZARD IS CREATED BY THIS ACTION. BE SURE TO
TEST ALL COMBINATIONS OF HIGH AND LOW ALARM INHIBIT ACTIONS
BEFORE PLACING CONTROL INTO OPERATION.
The following menu items apply only to the alarms.
AL 1
Alarm 1 function: Select OFF, Lo, H
I
, o r H
I
Lo, Factory default is Hi.
OFF
Alarm 1 is disabled. No Alarm 1 menu items appear in the
Secondary or Secure menus.
Lo
Low Alarm Only. A1Lo appears in the Secondary Menu.
H
I
High Alarm Only. A1Hi appears in the Secondary Menu.
HiLo
High and Low Alarms. Both A1Lo and A1Hi appear in the
Secondary Menu, and share the same Alarm 1 Relay output.
If AL1 is set to OFF, go to AL2 on the next page.
ALt
Alarm 1 Type: Select AbS or dE. Factory default is AbS.
AbS
Absolute Alarm that may be set anywhere within the values of
SCAL and SCAH and is independent of SP1H.
dE
Deviation Alarm that may be set as an offset from SP1H. As
SP1H is changed the Alarm Point will track with SP1H.
A1rE
Alarm 1 Reset: Select OnOF or Hold. Factory default is OnOF.
OnOF
Automatic Reset.
Hold
Manual Reset. Reset (acknowledge) by simultaneously pressing
the INDEX & DOWN ARROW keys for 5 seconds.
A1Pi
Alarm 1 Power Interrupt: Select On or OFF. Factory default is OFF.
On
Alarm Power Interrupt is On.
OFF
Alarm Power Interrupt is OFF.
A1iH
Alarm 1 Inhibit: Select On or OFF. Factory default is OFF.
On
Alarm Inhibit is On. Alarm action is suspended until the process
value first enters a non-alarm condition.
OFF
Alarm Inhibit is OFF.
A1St
Alarm 1 Output State: Select CLOS or OPEn. Factory default is CLOS.
CLOS
Closes Contacts at Alarm Set Point.
OPEn
Opens Contacts at Alarm Set Point.
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