PN 9000-133-VE, Rev U
Alarm Contact Connections
This section describes how to make wiring connections for any alarm devices
you wish to connect to the control unit.
Standard Alarm Connections
The WDG-V analyzer provides five (5) sets of normally open alarm contacts:
Terminal Block ID Description
SVC
–
Service Alarm
DV
–
Data Valid Alarm
ALM1
–
Process Alarm 1 (Configurable)
ALM2
–
Process Alarm 2 (Configurable)
ALM3
–
Process Alarm 3 (Configurable)
The process alarms are referenced as Relay 3, Relay 4, and Relay 5.
Relay 3
–
ALM 1
Relay 4
–
ALM 2
Relay 5
–
ALM 3
•
Service Alarm Relay
The Service Alarm indicates that a critical alarm exists and the analyzer
needs repair. Readings are not valid when this alarm is active. The relay
contacts are normally open and are Open (de-energized) when a critical
alarm exists, or on loss of power. Contacts are Closed when the analyzer is
in Normal mode.
•
Data Valid Relay
The Data Valid Alarm indicates if the concentration readings are represen-
tative of the process. When this alarm is active, concentration readings may
not be representative of the process and should not be used for control/
safety. Examples of this alarm include:
Warm-Up
mode,
Calibration
mode,
and
Diagnostic
mode. This alarm differs from the
Service Alarm
in that
there is not necessarily a problem with the analyzer when this alarm is
active. The relay contacts are normally Open and are Open (de-energized)
when the concentration readings are not valid, there’s a problem with the
analyzer, when the analyzer is calibrating, warming up, when the analyzer
is in diagnostic mode, or on loss of power.
2-32 | Thermox
®
WDG-V / VC / VCM / VM
Содержание WDG-V
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