Group 31 Compact Valve Actuators
Beck Control Electronics
 Accurate Position Control
Group 31 Analog Modulating
drives, models 31-M50 and 31-M30, include a single electronic
control module which receives a
4–20 mA or 1–5 V dc input signal
and provides a 4–20 mA or 1–5 V
dc feedback for position control
and indication.
- Electronic module has a
deadband of 1.0% of span
with sensitivity of 25% of
deadband.
- The input signal span is
nominally adjustable from 50% to 125% of the 4 V span, with the
zero adjustable up to 120% of span, providing flexibility for split
range operation.
Position Feedback
Beck Group 31 drives equipped with feedback capability use a film
potentiometer incorporated into the control module.
All modulating models feature electronic position indication. Direct AC
models allow controllers to monitor drive position as the controller
output directly positions the drive. Analog control modulating models
provide electronic signal receiver circuitry, which compares the position
indication to the control loop demand signal and provides automatic
control.
Dual Feedback Capability
Models 31-M50, 31-M30, 31-350, and 31-330 have dual feedback
capability, permitting user choice of 2-wire or 4-wire field connection.
Connections for feedback selection are made in the field and need not
be specified on order.
Low Power Consumption for Use with Uninterruptible Power Supplies
The uniquely low power draw of Beck Group 31 drives permits the use of
various standard uninterruptible power supplies for operation during loss
of AC power. Beck Sales Engineers can provide you with specifications
on UPS equipment recommended for Beck drives.
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