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Description
Action Pak models AP1080 single
setpoint and AP1090 dual setpoint
limit alarms offer flexible,
wide-ranging DC input capability.
Voltage spans from 10mV to 200
volts and current spans from
1mA to 100mA can be field configured.
Bipolar inputs are also accepted.
Both models offer configurable
latching, failsafe and HI/ LO
operation. The AP1080 and AP1090
also include 0.25%-50% adjustable
deadbands and selectable 120/240VAC
input power.
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Operation
The field configurable AP1080
and AP1090 limit alarm setpoints
can be configured for HI, LO,
latching or failsafe trip operation.
Non-latching HI and LO setpoints
have respective HI and LO deadbands.
In a tripped condition, the
setpoint is exceeded and the
appropriate red LED will illuminate.
The trip will reset only when
the process falls below the
HI deadband or rises above the
LO deadband (see figure 1).
To reset a latched setpoint
the signal must be in the safe
region and the line power turned
off for at least 5 seconds.
For proper deadband operation,
a HI setpoint must always be
set above a LO setpoint.
In
failsafe operation, the relay
is energized when the process
is below the HI setpoint or
above the LO setpoint (opposite
for non- failsafe). In the failsafe
mode, the relays go to the tripped
condition when the power fails.
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