Bray GAS Series, GASRE24-450, GASEX24-450 Operating Instructions Manual

Bray Controls Commercial Division
13788 West Road, Suite 200A
Houston, Texas 77041

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Phone: [phone]
Fax: [phone]
www.braycommercialdivision.com

GAS Series - Actuator — Operating Instructions

1/28/19

GAS -Spring Return Actuator - (GASRE24-450 & GASEX24-450)

24V, On/O, Floating and Modulating
Automatic adaptation to valve, precision control and high energy eciency with minimal operating noise.

Features

• Actuator with spring return action and pushing force of 450 lbs. (2000 N), in 'normally retracted' or 'normally extended' versions

• DC motor with electronic control unit and electronic load- dependent cut-o

• Automatic detection of control signal applied (modulating or oating), display via 2 LEDs

• The type of characteristic curve (linear, quadratic or equal percentage) can be adjusted in the drive

• Independent adaptation to valve stroke between 0.31 in.(8 mm) and 1.57 in.(40 mm), captive even if the power is turned o

• Direction of travel can be selected via screw terminals when making electrical connection or remotely

• Hand crank for external manual adjustment with motor cut-o and as trip for re-calibration

• Easy assembly with valve, spindle connection takes place automatically after application of control voltage

• Many adaptor kits allow assembly on third-party valves

Technical Description

• Two-part housing made of self-extinguishing red plastic and sealing to IP66 (equivalent to NEMA 4) protection class

• Maintenance-free gearbox in sintered steel, gearbox base-plate in steel

• Spring assembly in Stainless Steel

• Patented drive-valve coupling

• Mounting column made of stainless steel and mounting bracket for tting valve made of cast light alloy

• Electrical connections 13 AWG (max. 2.5 mm²) with screw terminals

• Three knock-out cable entries for M20×1.5 (2×) and M16×1.5

• Fitting position: vertical to horizontal, but not upside down

Accessories

Auxillary Switches

0372333 001 Continuously adjustable, min. 100 mA and 12 V, additional load 6(2) A
0372333 002 Gold-plated contacts, from 1 mA and up to 30 V, further range 3(1) A
Adaptor kits for Industrial Globe Valves
GA-MTG-01 DG250-x and DG3-x
GA-MTG-02 DG4-x, DG5-x and DG6-x
Fittings
0386263 001 Screwed cable tting M16 X 1.5
0386263 002 Screwed cable tting M20 X 1.5

High Media Temperature Kit

0372336 240 Adaptor required for medium temperatures between 266˚F (130˚C) and 464˚F (240˚C)

Operation

After a new start, up to 45 s of waiting time will pass before the drive is available again. Depending on the type of connection
(see the wiring diagram), the device can be used as a modulating drive (0...10 V and/or 4...20 mA), a On/O (2-point) drive
(extend/retract) or a Floating (3-point) drive (extend/stop/retract). The run time of the drive can be set according to the specic
requirements, using switches S1 and S2. Switches S3 and S4 are used to congure the characteristic curve (equal percentage,
linear or quadratic). The external hand crank allows you to adjust the position manually. When the hand crank is folded out, the
motor is switched o. After the hand crank is folded back, the spring function is active again and the setpoint position is adopted
again (without calibration). If the hand crank is unfolded, the drive stays in this position.

Calibration and feedback signal

The drive calibrates itself automatically, whether it is used in a modulating, On/O (2-point )or Floating (3-point) mode. Voltage
needs to be applied to terminal 21. As soon as voltage is applied to either terminals 2a or 2b for the rst time and the waiting
period (both LEDs green) of approximately 45 seconds has elapsed, the drive moves to the lower limit stop on the valve, thus
enabling automatic connection with the valve spindle. Then it moves to the upper limit stop, and the value is recorded and saved
with the help of a path measurement system.

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GAS Series - Actuators — Operating Instructions Continued

Calibration and feedback signal - Continued

The control signal and the feedback signal are adjusted to this eective stroke. After an interruption to the voltage or a
spring return action, no re-calibration is performed and the values are saved. Calibration must be performed in order to
utilize the feedback signal when On/O (2-point) or Floating (3-point) control is required. Terminal 44 is 0-10 VDC feedback.
The feedback signal always increases as the shaft extends.

Re-Calibration

To re-calibrate, voltage needs to be applied to either terminals 2a or 2b and terminal 21. Prior to re-calibration if power has
been disconnected or terminal 21 has lost power there will be a waiting period (both LEDs ash green) of approximately
45 seconds. To trigger re-calibration, fold the hand crank out and back in again twice within 4 seconds. Each time the hand
crank is folded out rotate it slightly in either direction until a clicking sound is heard. Both the LEDs will then ash red.

During re-calibration, the feedback signal is inactive, or it corresponds to a value of "0". Re-calibration uses the shortest run
time. The re-calibration is only valid once the entire procedure has been completed. Folding the hand crank out again will
interrupt the procedure. If the actuator detects a blockage, it will report this by setting the feedback signal to 0 V after
approx. 90's. However, the drive will try to overcome the blockage during this time. If it is possible to overcome the blockage,
the normal control function is activated again and the feedback signal is restored.

Spring Return

If the voltage supply fails or is switched o, or if a terminal 21is disconnected, the brush- less DC motor releases the gear
and the drive is moved into the respective end position (depending on the design version) by the pre-tensioned spring. As
this happens, the control function of the drive is disabled for approximately 45 seconds (both LEDs green) so that the end
position can be reached in every case. The reset speed is controlled with the help of the motor so that there are no pressure
surges in the line. The brushless DC motor has three functions: as a magnet to hold the position, as a brake (by acting as a
generator) and as a motor for the control function. After a spring return function, the drive does not re- calibrate itself.

Connection as a On/O (2-point) Actuator

This activation can take place via two cables. Voltage is applied to terminals 2a and 21. Applying the voltage (24 V) to
terminal 2b causes the actuator shaft to extend. After this voltage has been switched o, the drive moves to the opposite
end position. The electronic motor switch-o responds in the end positions (valve limit stop, or when maximum stroke is
reached) or in case of overload (no limit switches).
The coding switch can be used to set the run times. The characteristic curve cannot be selected in this case (resulting in the
characteristic curve for the valve). The feedback signal is active as long as the calibration was performed. Terminals 3i, 3u
must not be connected.

Connection as a Floating (3-point) Actuator

Applying voltage to terminals 21, 2a or 2b makes it possible to move the valve to any desired position. If voltage is applied to
2b, the actuator shaft extends. The shaft retracts when voltage is applied terminal 2a.
In the end positions (at the valve stop, or when the maximum stroke is reached) or in case of an over- load, the electronic
motor switch-o responds (no limit switches). The direction of the stroke can be changed by transposing the connections.
The coding switch is used to set the run times. In this case, the characteristic curve cannot be selected (resulting in the char­acteristic curve for the valve). The feedback signal is active as long as the calibration was performed. Terminals 3i, 3u must
not be connected.

Modulating Actuator (0...10 V and/or 4...20 mA)

The built-in positioner controls the drive depending on the controller input signal y.
The input signal used is a voltage signal (0...10 V–) at terminal 3u, or a current signal at terminal 3i. If an input signal is
present at both terminals (3u (0...10 V) and 3i (4...20 mA)) simultaneously, the input with the higher value takes priority.

Apply voltage to terminal 21.

Mode of action 1 (apply voltage to internal connection 2a): As the input signal increases, the valve shaft extends.

Mode of action 2 (apply voltage to internal connection 2b): As the input signal increases, the valve shaft retracts.

The starting point and the control span are xed. After the voltage supply is applied and after calibration, the drive moves to
each valve stroke between 0% and 100%, depending on the input signal. The electronics and the path measurement system
ensure that no stroke is lost, and the drive does not require re-calibration at intervals. When the end positions are reached,
the position is checked, corrected as necessary and stored again. This ensures parallel running of several drives of the same
type. Feedback signal y0 = 0...10 V corresponds to the eective valve extention of 0 to 100%.

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