AcquiSuite Ally 12 & 48 User Guide (Rev D)
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ALARM (SPDT)
The Ally meter supports user-configurable alarms for over-current, under-current, over voltage, and
under-voltage. Obvius Ally Configuration Console helps users set these values by allowing for values to be
entered using direct entry mode or specifying the limits as a percentage of nominal.
Alarm persistence settings are used to allow for temporary conditions, such as a motor starting, that are
beyond trigger limits. For example, in the case of meter upset from ESD events, short persistence settings
may lead to false alarm triggers. When any alarm condition has been satisfied throughout the persistence
interval, the AcquiSuite Ally trips the MASTER ALARM relay, which is an electromechanical relay on the
PCB.
Once tripped, the relay can only be reset by clearing the alarm through Modbus register/ BACnet object
2451”
The Master Alarm relay can be hard wired to an interrupt or polling circuit in a host system allowing for a
more rapid response than the data polling frequency, if desired. The status of each alarm is determined
by reading status registers.
Refer to the register list, or Configuration Console manual for more information.
• Note: The Master Alarm relay is intended for low voltage DC connections. The
user must protect the switch from over-current conditions when closed.
12 Volt Auxiliary Power
The AcquiSuite™ Ally meter provides an auxiliary 12 volt output that is derived from an auxiliary winding
on the AcquiSuite™ Ally line connected power supply. The 12 volt supply voltage is unregulated but
protected by a self-resetting fuse. The purpose of the supply is to power external radio equipment or
provide supply voltage for analog sensors such as 4-20mA current loop devices. If full rated current is
drawn from this terminal the minimum operating voltage of the L1-L2 power supply is 100 VAC.
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