B-11
The D
iscrete Caution, Warning and Alarm Relays:
• are single-pole, double-throw (SPDT) type relays.
• co
ntacts may be connected to equipment to alert personnel that an
al
arm condition exists.
Applying Power
Apply power to the Chillgard RT Refrigerant Monitor and Chillgard RT
Relay Module. The Power Indicator on the Relay Module should
illuminate.
The Tr
ouble Relay in the Relay Module will energize when
communications from the Chillgard RT Refrigerant Monitor have been
received, no internal relay faults have been detected, and the Chillgard
RT Refrigerant Monitor is not in the Trouble state.
The R
eady Indicator will illuminate when the Chillgard RT Refrigerant
Monitor is in the Ready state, and the conditions described above
remain valid.
Note t
hat during the Warm-Up state of the Chillgard RT Refrigerant
Monitor, all alarm relays in the Relay Module are cleared.
Alarm Relay Configuration
La
tching
The configuration of all alarm relays is controlled by the Chillgard RT
Refrigerant Monitor.
• I
f the Chillgard RT alarm relay (CAUTION, WARNING, ALARM) is
c
onfigured as latching, all eight relays of the corresponding bank in
the Relay M
odule are configured for latching operation.
• L
ikewise, if the Chillgard RT alarm relay (CAUTION, WARNING,
ALARM) i
s configured as non-latching, all eight relays of the
c
orresponding bank in the Relay Module are configured for non-
latching operation.
Normally Energized/De-energized
While the alarm relays in the Chillgard RT Refrigerant Monitor can be
configured as either normally energized or normally de-energized, all
alarm relays in the Chillgard RT 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
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