Actuator Linear

Control Systems

A HVAC control system is a device or set of devices to manage, command, direct or regulate the behavior of other devices or systems.

There are two common classes of HVAC control systems, with many variations and combinations: logic or sequential controls, and feedback or linear controls. There is also fuzzy logic, which attempts to combine some of the design simplicity of logic with the utility of linear control. Some devices or systems are inherently not controllable.

The term “control system” may be applied to the essentially manual controls that allow an operator to, for example, close and open a hydraulic press, where the logic requires that it cannot be moved unless safety guards are in place.

An automatic sequential control system may trigger a series of mechanical actuators in the correct sequence to perform a task. For example various electric and pneumatic transducers may fold and glue a cardboard box, fill it with product and then seal it in an automatic packaging machine.

In the case of linear feedback systems, a control loop, including sensors, control algorithms and actuators, is arranged in such a fashion as to try to regulate a variable at a setpoint or reference value. An example of this may increase the fuel supply to a furnace when a measured temperature drops. PID controllers are common and effective in cases such as this. Control systems that include some sensing of the results they are trying to achieve are making use of feedback and so can, to some extent, adapt to varying circumstances. Open-loop control systems do not directly make use of feedback, but run only in pre-arranged ways.

Pure logic control systems were historically implemented by electricians with networks of relays, and designed with a notation called ladder logic. Today, most such systems are constructed with programmable logic devices.

Logic controllers may respond to switches, light sensors, pressure switches etc and cause the machinery to perform some operation. Logic systems are used to sequence mechanical operations in many applications. Examples include elevators, washing machines and other systems with interrelated stop-go operations.

Logic systems are quite easy to design, and can handle very complex operations. Some aspects of logic system design make use of Boolean logic.

For example, a thermostat is a simple negative-feedback control: when the temperature (the “measured variable” or MV) goes below a set point (SP), the heater is switched on. Another example could be a pressure-switch on an air compressor: when the pressure (MV) drops below the threshold (SP), the pump is powered. Refrigerators and vacuum pumps contain similar mechanisms operating in reverse, but still providing negative feedback to correct errors.

Simple on-off feedback control systems like these are cheap and effective. In some cases, like the simple compressor example, they may represent a good design choice.

In most applications of on-off feedback control, some consideration needs to be given to other costs, such as wear and tear of control valves and maybe other start-up costs when power is reapplied each time the MV drops. Therefore, practical on-off control systems are designed to include hysteresis, usually in the form of a deadband, a region around the setpoint value in which no control action occurs. The width of deadband may be adjustable or programmable.

Linear control systems use linear negative feedback to produce a control signal mathematically based on other variables, with a view to maintaining the controlled process within an acceptable operating range.

The output from a linear control system into the controlled process may be in the form of a directly variable signal, such as a valve that may be 0 or 100% open or anywhere in between. Sometimes this is not feasible and so, after calculating the current required corrective signal, a linear control system may repeatedly switch an actuator, such as a pump, motor or heater, fully on and then fully off again, regulating the duty cycle using pulse-width modulation.

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From Hydraulic to Electric: Industrial Linear Actuators

NEW THOMSON TG07K207-A00X160 RODLESS LINEAR ACTUATOR M-75 RAPIDTRAK 160CM STROKE $5,999.99

Phillips Brilliance CT Linear Actuator RH 453566502531 $5,486.40

Phillips Brilliance CT Linear Actuator LH 453566502541 $5,486.40

NEW IN BOX EXLAR GSX30-1001-MFM-AB7-268 ELECTRIC LINEAR ACTUATOR GSX SERIES $3,799.99

THK KR5520BE+1114LP2E-00X0 Linear Actuator $3,333.00

Newport IMS600CCHA Linear Stage – Linear Actuator, 600mm travel $3,250.00

PARKER DAEDEL 802-1609A LINEAR ACTUATOR $3,169.99

THK LINEAR SERVO GLM20-316-L2-EP-N ,ACTUATOR,BEARING,CNC,ROUTER $3,199.99

Allen-Bradley AC servo linear actuator electric cylinder Kinetix MPAI-A4300CM34A $3,000.00

Zenith K-2105 Linear Actuator New $3,016.00

*NEW* THK 49″ Linear Guide Ballscrew Actuator – CNC Kit $2,850.00

IVEK Digispense 2000 w/ Linear Actuator-40 + Pump Head $2,750.00

Industrial Devices LM Linear Module Control 64 Actuator $2,499.99

SMAC LAR30-025-55CV MOD 282 Linear Actuator “NEW” $2,500.00

Smac LAR30-025-55CV LAR3002555CV MOD282 Linear Actuator $2,429.00

NEW LinTech Precision Linear Ballscrew Actuator, Bellows Cover, Nema34 – THK CNC $2,350.00

Zenith K-2133 Linear Actuator New $2,184.00

NEW EXLAR SR LINEAR ACTUATOR SR31-1806-MDM-PC0-238 $2,100.00

THK GL15-1240L Linear Actuator With Yaskawa Motor $1,688.00

*NEW* 48″ Tol-O Matic B3S Linear Bearing Ballscrew Actuator Heavy-Duty -CNC THK $1,750.00

LINEAR SERVO ACTUATOR SXAMF24140N02BZ1 SXAMF24140N02B21 420-15669 SCAHSN02Z01 S5 $1,590.00

Kollmorgen linear stage actuator, 1750mm, DS6-1750-C-10G-X34-BE10-LP2-HP1-E0 $1,500.00

THK GL15-1240L Linear Actuator $1,388.00

Zenith K-2104 Linear Actuator Used $1,500.00

Kollmorgen Servo Motor, Drive, Linear Actuator, Cables $1,499.00

PARKER LINEAR ACTUATOR TABLE 007597701B 81-9239B $1,220.00

NEW Nexen Group Linear Actuator Sensor 912012 $1,499.99

IDC SERVO LINEAR ACTUATOR R4B32-101B-18-PL-ASE-BM NEW $1,295.00

PARKER DAEDAL 404XR SERIES LINEAR ACTUATOR 802-2576B $1,235.00

Aerotech High Precision Linear Actuator Axis 24″ Travel Crossed Roller Bearings $1,299.99

Giant German Precision Linear Actuator Very Stout Robust LinearTechnic Schulz $1,299.99

*NEW* THK 66″ Precision Linear Bearing LM Guide Actuator -CNC Plasma Router Kit $1,250.00

NIB EXLAR GSX40-0602-MEM-KM5-168-PF LINEAR ACTUATOR $1,250.00

PARKER DAEDAL SERIES 404XR LINEAR ACTUATOR NIB $1,175.00

OBARA LINEAR ACTUATOR # 105D0130/L W-UNT-C/405F -NEW $1,195.00

Intelligent Actuator (IAI) linear drive with controller 700mm travel $1,150.00

Chinook CH 47-D Helicopter Actuator Linear P/N:541604-8-1 $999.00

GUZIK S1701 AIR BEARING SPINDLE W LINEAR ACTUATOR FOR TABLETOP SPINSTAND SYSTEM $1,149.99

PARKER LINEAR ACTUATOR TABLE 007597701B connector cut $880.00

SMC MYC40-900L Air Linear Actuators NEW $888.00

NEW 48″ Thomson 2DB16 Super-Slide Linear Ballscrew Actuator Nema34-THK CNC $999.00

SMC MYH40-400-E73AL Air Linear Actuators NEW $888.00

OFFER & WIN ELECTRIC LINEAR ACTUATORS MAGNETIC HC 8AWAK-002 $900.00

THK KR 30 Linear Actuator + Servo motor & controller $988.00

Duff-Norton SPA6415-24 Super-Pac Electromechanical Linear Actuator, 24″, New $1,044.00

IAI MODEL RCS-SS-I-60-M-100-T1-R06-B ROBO LINEAR ACTUATOR ( NEW ) $998.95

AMC Brush Type PWM Servo Amplifier w/ SMAC LAL30-025-55F Linear Actuator 12A8M $999.99

THK KR46 900mm Precision Linear Bearing Ballscrew Actuator MCG Servo Motor $999.99

*NEW* 48″ Thomson 2DB12 Super-Slide Linear Ballscrew Actuator Nema23-THK CNC DIY $950.00

Parker Daedal 4945-06 Manual Screw Stage Linear Actuator Mechanical Manual used $995.95

SMC MYC25G-1045L Air Linear Actuators NEW $888.00

Rollon Uniline Linear Actuator Series A75 w/ Servo Motor, A75-1950L44M20, Used $850.00

SMC MYC25G-900H-E73AL Air Linear Actuators NEW $888.00

SMC MYC25G-1065L Air Linear Actuators NEW $888.00

Exlar GS45-0602-MFM-AB1-M6 Linear Servo Actuator $900.00

Movopart Heavy Duty Linear Actuator 3 Phase AC 885mm $661.00

Star linear actuator TYPE S 0360-400 715mm work area $900.00

NEW THK GL20S20+1000L-C Ball Screw Drive Linear Actuator $850.00

LINEAR LRA LINEAR GARAGE ACTUATOR $911.00

LINEAR STAGE ACTUATOR TABLE 24″ TRAVEL 0.25″ LEAD $899.00

Pull Type Open Frame Actuator Electric Solenoid DC 12V 1A $7.31 Pluger Dia.: 0.4cm/0.16”; Cable Length: 8cm/3.1”; Net Weight: 14g; Package Content: 1 x Open Frame Solenoid Electromagnet; Pull type, open frame type, linear motion, open coil form, DC electronmagnet; Used widely in medical apparatus,home appliances,vending machines, game machine,auto door lock,cabinet etc….

AutoLoc LAD12 0-12 Adjustable Linear Actuator with Rod Bearing – 200 lbs. $279.99 Autoloc Lad12 Adjustbl Linear Actuator 0-12…

Linear Motion Open Frame Pull Type Electromagnet Solenoid DC 12V 1A $6.50 Cable Length: 10cm/3.9”; Net Weight: 13g; Package Content: 1 x Open Frame Solenoid; Pull type, open frame type, linear motion, open coil form, DC electronmagnet; Used widely in medical apparatus,home appliances,vending machines, game machine,auto door lock,cabinet etc….

LEGO Technic Power Function Accessory box (8293) $27.40 Add even more power to your LEGO Technic creations! This Power Functions motor set includes a motor, battery box, light cable, pole switch and additional pieces to add new functions and features to your motorized models. Requires six “AA” batteries, not included. 10 pieces….

LEGO TECHNIC Motorized Excavator 8043 $194.95 No construction project is too big for this heavy-duty excavator! Flip a switch on the Power Functions dual infrared remote control to drive the excavator and spin the cabin 360? or to raise and lower the articulated arm and operate the shovel for digging. Rebuilds into a Tracked Loader.Features include: •Fully remote controlled excavator•Double remote controls tracks to run back and for…

LEGO Technic Backhoe Loader 8069 $54.61 LEGO Technic Backhoe Loader This Backhoe Loader is built to taken on tough jobs. Designed to take bigger loads, this vehicle has a gear-controlled front bucket and a backhoe that can maneuver and twist in all directions. It also has new mini linear actuators that offers more stability while lifting heavy items. With intricate details and innovative design, this backhoe loader looks very realisti…

CMC Hydraulic Actuator 7050 $335.00 CMC Hydraulic Actuator 7050 (CMC7050) CMC Hydraulic Actuator #7050 Features: CMC Hydraulic Actuator for hydraulic jack plates, PT-130 and PT-35 tilt trim units. This CMC Hydraulic Actuator 7050 of jack plate has been in production for the past 12 years. CMC Hydraulic Actuators for boat transom are completely self contained with their own fluid reservoir. They incorporate the pump,…

USAutomtic 020335 Medium 300 Solar Charged Automatic Gate Opener Double Gate Basic Kit $1,373.89 The Sentry 300 Solar Charged Automatic Gate Opener Double Gate Basic Kit contains the first high quality commercial grade Do it Yourself dual gate opener. The universal mounting brackets will allow for push to open or pull to open installation easily bolt on to most existing gates. The linear actuator provides 400 lbs of thrust and has a compression rating of 1000 lbs. Open or close time is typica…