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INM 725B Rev 21
4
POWER SUPPLY MONITORING
4 .1 Power Monitor Relays
On units with integral PSUs each annunciator can be equipped with two integral power monitor
relays which provide volt-free contacts for use with 3rd party devices to indicate loss of primary
or aux supplies. Both relays provide volt-free changeover contacts for customer use. The power
monitor relays are provided on a separate plug-in card in the lower section of the annunciator.
The power monitor relays can be configured as either normally energised or normally de-
energised, the factory default setting is energised. For instructions on how to change this
setting, please refer to the RTK 725B Configuration Software manual.
4 .2 Power Monitor LED’s
2 x Green LED’s are provided just below the customer terminals to indicate if the power is
present on the primary aux supplies.
• The left-hand LED,(PSU1 LED1), is ON when the aux supply is present and will flash
when the aux supply is lost (as long as the primary supply is available to
power the LED)
• The right-hand LED,(PSU2 LED2), is ON when the primary supply is present and will
flash when the primary supply is lost (as long as the aux supply is available to
power the LED)
NO1 R1 NC1
POWER MONITOR RELAYS
NO2
NC2
R2
PSU1
LED1
PSU2
LED2
PRIMARY
AUX
CB9413POP1 - SMR CARD