|
Description
The Action Pak model AP1690
dual setpoint limit alarm offers
flexible, wide ranging AC input
and relay output capability.
Voltage spans from 100mV to
200VAC and current spans from
10mA to 100mA AC can be field
configured. For current input
spans of 1 to 5 Amps a 0.1W
(0.1%) shunt resistor (Model
#C006 ) is available. The AP1690
offers configurable latching,
failsafe, and HI/LO operation.
The unit also includes 0.25%
to 50% adjustable deadband and
selectable 120/240VAC power.
|
 |
Operation
The field configurable AP1690
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 non-latching trip will reset
only when the process falls
below the HI deadband or rises
above the low 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, the HI setpoint must
always be set above the 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 trip
condition when power fails.
|
