Chemgard Infrared Gas Monitor
•
de-energizes if power is removed
•
contacts may be connected to equipment
to alert personnel that a trouble
condition exists
The Discrete Caution, Warning and Alarm Relays:
•
are single-pole, double-throw (SPDT)
type relays.
•
contacts may be connected to equipment to
alert personnel that an alarm condition exists.
Applying Power
Apply power to the Chemgard Infrared Gas
Monitor and Chemgard Relay Module. The Power
Indicator on the Relay Module should illuminate.
The Trouble Relay in the Relay Module will
energize when communications from the
Chemgard Infrared Gas
Monitor have been
received, no internal relay faults have been
detected, and the Chemgard Infrared Gas Monitor
is not in the Trouble state.
The Ready Indicator will illuminate when the
Chemgard Infrared Gas Monitor is in the Ready state,
and the conditions described above remain valid.
Note that during the Warm-Up state of the
Chemgard Infrared Gas Monitor, all alarm relays
in the Relay Module are cleared.
Alarm Relay Configuration
Latching
The configuration of all alarm relays is controlled
by the Chemgard Infrared Gas Monitor.
•
If the Chemgard alarm relay (CAUTION,
WARNING, ALARM) is configured as latching,
all eight relays of the corresponding bank in
the Relay Module are configured for latching
operation.
•
Likewise, if the Chemgard alarm relay
(CAUTION, WARNING, ALARM) is
configured as non-latching, all eight relays of
the corresponding bank in the Relay Module
are configured for non-latching operation.
Normally Energized/De-energized
While the alarm relays in the Chemgard Infrared
Gas Monitor can be configured as
either
normally energized or normally de-energized, all
alarm relays in the Chemgard Relay Module are
magnetically latching; therefore the normally
energized/de-energized designations do not apply.
The contact labels "normally open," "normally
closed" and "common" are assigned for
convenience. The "normally open" contacts close
and "normally closed" contacts open to signal an
alarm condition. These relays DO NOT change
state when power is removed.
Operation
Proper operation of the alarm relays requires
maintaining successful communication between
the Relay Module and the controlling
Chemgard
Infrared Gas Monitor since all alarm relay
operations are based on cumulative information
received from the Monitor.
Alarm level information for each point of the
multi-point sequencer is received from the
controlling Chemgard Infrared Gas Monitor.
This information is used to set the CAUTION,
WARNING, and ALARM relays corresponding to
each sequencer point.
•
In non-latching configurations, relay(s) will
reset when information from the controlling
Monitor indicates that the alarm condition(s)
for the specific point has abated.
•
In latching configurations, relay(s) remain set
(latched) when the condition abates, and do
not reset until the Relay Module reset switch
is pressed.
Reset Switch
The reset switches of the Chemgard Relay
Module and controlling Chemgard Infrared Gas
Monitor act independently. Pressing the reset
switch on the Monitor does not affect the Relay
Module alarm relays, and pressing the reset
switch on the Relay Module does not affect the
Monitor alarm relays.
•
In non-latching configurations, the Relay
Module reset switch does not affect the state
of the alarm relays.
•
In latching configurations, the reset switch
resets the alarm relay only if the alarm
condition has abated.
Trouble Relay
While a trouble condition in the Chemgard
Infrared Gas Monitor activates the trouble relay in
the Chemgard Relay Module, a trouble condition
in the Relay Module does not activate the trouble
relay in the controlling Chemgard Infrared Gas
Monitor.
Horn Operation
Configuration
The configuration of the horn relay is controlled
by the Chemgard Infrared Gas Monitor.
•
The Horn Relay in the Relay Module is
configured by the “Caution sets Audio Ala
rm,”
“Warning sets Audio Alarm,” “Alarm sets
To Next Page
Loading...
