PAX1 Motor Set Pressure Regulator
User Manual
2
Section Page
Contents
Electrical Connections, DC Power
Electrical Connections, AC Power
PAX1 Actuator & Pressure Regulator Assembly
1.
Overview
The PAX1 Motor Set Pressure Regulator is a
flexible linear actuator coupled to Fairchild
precision pressure regulators and capable of
controlling pressure ranges of 0-0.5 psig to
0-3000 psig all housed in a flameproof enclosure.
The unit is inherently lock in last place as the
actuator will maintain its position upon loss of
electrical power.
Power input options include 12-24 VDC or universal AC input
95-250 VAC 47-63 Hz.
The PAX1 can be actuated open loop using two optically
isolated switch closure inputs (Up and Down) to change
the pressure regulators setpoint. The PAX1 will continue to
change the pressure regulator’s setpoint in response to the
activated input until either of the adjustable range limits
are reached.
The PAX1 has an isolated 4-20 mA control input to
proportionally control the pressure regulator’s setpoint.
In analog control mode, the unit is fail freeze upon loss of
the control signal.
The actuator features UP and DOWN push buttons under
the cover to facilitate commissioning and to permit local
control of the pressure regulator’s setpoint. There is an 8 mm
(
5
/
16
”) female hex motor drive interface under the cover
to allow manual setpoint adjustment in the case of loss of
electrical power.
WARNING:
The cover must not be removed in
the presence of a hazardous classified combustible
atmosphere when power is present. Multiple power
sources are possible including those operating the
analog inputs, pulse inputs, alarm relays and feedback
circuits.
The actuator includes two fully adjustable 1A, 250 VAC
SPDT alarm relays (one High and one Low) providing alarm
function when the pressure regulator output pressure
reaches critical values. The relays are magnetically latched so
the alarm switch states are maintained when the power is
disconnected. This allows accurate alarm function on systems
that remove power from the actuator between adjustments
to conserve power as is typically done in solar powered
installations.
The PAX1 offers an optional optically isolated electronic
4-20 mA feedback output. This feedback feature is functional
for both the pulse control and analog control configurations.
The unit must be powered to facilitate the feedback output
function.
The PAX1 can also be controlled via Modbus RTU digital
communications over an optional optically isolated
RS-485 network. The Modbus communications include a
full featured command set allowing control, monitoring,
commissioning and diagnostics capability over the digital
communication.
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Summary of Contents for FAIRCHILD PAX1
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