FAQs for SMART Electro-Hydraulic Actuators & Servo Power Units
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The SMART Electro-hydraulic actuator (SHA) is an actuator that incorporates a motor, pump and valving mounted directly to a hydraulic cylinder. This configuration eliminates the separate hydraulic power unit, hoses and leak points inherent with traditional hydraulics. The SHA incorporates a position sensor and pressure transducer that are used to provide feedback for precise servo control. The motor runs in one direction to extend and the other to retract the piston/rod. It also only uses power when commanded to run. The actuator has many configurations and can be installed in any orientation. The servo control and instrumentation included in the SHA also allows for IoT interface functions such as predicative maintenance and Overall Equipment Effectiveness (OEE) monitoring. This type of actuator is also referred to as a “Servo electro-hydraulic actuator”. Get more information on S-Series Actuators.
All-In-One actuator means a complete and fully tested electro-hydraulic actuation system including: the cylinder, attached power unit, motor, controller/drive wired on a panel or in an enclosure, our standard proven software and cables. The All-In-One solution requires only that the actuator be mounted, power connected, and external control signals provided, and the actuation system is ready to operate. In addition, documentation provided includes an interface manual, electrical schematic and a mechanical drawing outlining the specifications and requirements. The Kyntronics SMART electro-hydraulic actuator is an example of an all-in-one actuator.
This type of actuator operates at a high speed with low load, and then switches modes to operate at a high force at lower speed. It is generally used where a large amount of the stroke length is under low load and a short amount of the stroke length requires high force to do the work needed in the application. An example of this would be a metal forming press. Kyntronics offers two types of SMART electro-hydraulic actuator (SHA) configurations as high speed / high force actuators.
The SMART electro-hydraulic actuator (SHA) is a totally sealed (no air), self-contained actuator consisting of a cylinder, pump, manifold and servo motor, all in an integral package. There are no hoses or leak points on the SHA vs. a traditional hydraulic cylinder / HPU system. Functionally, the SHA retains the positive characteristics of traditional hydraulics such as high force density, tolerance for shock and side-loading, and robustness, while eliminating the negatives such as inefficiency, high energy usage, risk of leaks/environmental impact, noisy operation and difficulty/high cost to precisely control. The SHA has many advantages over traditional hydraulic systems.
The SMART electro-hydraulic actuator (SHA) is essentially an “electric actuator” that looks similar to a screw-driven actuator but rather than using gears, drive screws and driven nuts, the SHA uses an integral hydraulic cylinder with minimal fluid. Functionally, the SHA has many of the positive advantages of a screw-driven actuator such as energy efficiency / power-on-demand, precision servo control, clean operation, and fieldbus connectivity, however, the SHA eliminates the negatives of screw-driven actuators including metal-to-metal wear, need for lubrication and regular maintenance, and susceptibility to damage from shock loads.
The SMART electro-hydraulic actuator (SHA) is an ideal actuator for most industrial equipment applications. Some of the most common applications include presses, test equipment, material handling, lifting, positioning, metal fabrication, clamping and many others. Find more information on electro-hydraulic actuator applications.
Yes, there is a very significant savings opportunity using the SMART electro-hydraulic actuator (SHA) instead of traditional hydraulics. The operating cost savings is due to the following factors: the SHA is a closed system that does not require fluid replacement. Traditional hydraulics requires fluid replacement and fluid disposal as part of standard maintenance which involves hundreds of gallons annually per system. Energy usage is another cost savings advantage by using the SHA. This is due to the SHA being a “power-on-demand” device whereas traditional hydraulics run continuously and is far less efficient compared with the SHA. Other factors impacting operating costs unfavorably for traditional hydraulics include higher maintenance costs (filter replacements), downtime (burst hoses), employee safety factors (slipping from hydraulic leaks), product contamination (hydraulic fluid on parts) and requiring more floor space. For more information: pdf Select the Right Type of Actuator - Don’t Let Hidden Operating Costs Sink Your Ship
The SMART electro-hydraulic actuator (SHA) and a traditional EHA share many similar characteristics. Both have a pump, motor, valving and cylinder mounted together eliminating the hydraulic power unit, hoses and connections inherent with a typical hydraulic system. In addition, the SHA includes features such as a linear position sensor, pressure transducers, a servo motor and a control system that are used to provide precise process control for the application, and support IoT functions.
The Servo Power Unit (SPU) is an electrically powered device that operates a hydraulic cylinder or rotary actuator. The SPU is an electro-hydraulic power unit that incorporates a servo motor, pump, valving and rod compensation reservoir and connects directly to an external cylinder or rotary actuator through quick-connect couplings. The SPU is typically located very close to the cylinder or rotary actuator to minimize fluid and efficiency losses. A Servo Power Unit is typically used to operate a single cylinder, although it can operate multiple devices in certain cases. Unlike a traditional hydraulic power unit, the SPU is a totally sealed system that does not require fluid changes, uses a minimal amount of fluid and provides precise servo control of position, force and speed. Get more information on Servo Power Units
Servo Power Units (SPU) are an ideal solution for those instances where the All-In-One SMART Electro-Hydraulic Actuator (SHA) is not able to fit in the available space. The SPU provides many of the same benefits available in the SHA including precise position, speed and force control, energy efficiency, minimal fluid and compact size. The SPU connects to a customer-supplied cylinder through robust quick connect fittings. The SPU can be located close to the cylinder to create a compact footprint and reduce hose length. The SPU operates both linear cylinders and rotary actuators. This technology is a cost-effective electro-hydraulic power unit upgrade from a traditional hydraulic power unit in both industrial and mobile applications. It’s power-on-demand feature significantly reduces energy usage, and the totally sealed design eliminates maintenance. Find more technical details about the Servo Power Unit.
The electrically powered Servo Power Unit provides energy saving power-on-demand and higher efficiency operation unlike traditional hydraulic power units. The SPU’s totally sealed design eliminates the need for fluid changes and maintenance. In addition, the compact footprint allows the Servo Power Unit to be located very close to the cylinder reducing losses, improving control and minimizing fluid. The Servo Power Unit also has built-in precision servo control of position, force and speed which are expensive to incorporate in traditional hydraulic power units.
There are several control options available for the SMART electro-hydraulic actuator (SHA). The “all-in-one” solution from Kyntronics includes a servo drive/controller either in an enclosure or on a subpanel that can be mounted in the customer’s enclosure. This precision actuation solution includes standard software features developed by Kyntronics for most applications. The SHA is also provided as an “actuator only” option when the motor and drive are provided by others and Kyntronics provides the actuator with the motor mounting bracket and shaft coupling for the specific motor chosen. Common motors used on the SHA include: Rockwell Automation/Allen Bradley, Siemens, Mitsubishi, and several others.
SMART electro-hydraulic actuators (SHA) have hundreds of SHAs successful installations operating with Rockwell Automation servo motors, Kinetix drives and PLCs. Kyntronics makes it simple for the integrator and has developed an AOI for Rockwell Automation. We also provide an extensive library of tools covering hardware selection, interfacing instructions and even sample projects on the Kyntronics website.
Yes. The SMART electro-hydraulic actuator (SHA) includes a position sensor and pressure transducers for force measurement. These signals are connected to the control and used for precise process control. The Kyntronics all-in-one precision actuation system options include software to control the actuator to a specific position, or a specific force. One of the advantages of the electro-hydraulic system is the software includes functions to control position and measure force, control force and measure position, and automatically switch from controlling position to controlling force and vice-versa. The most popular control method is Position control with Force Limit – meaning it will run in position control mode until a desired force is exceeded, then seamlessly switches to controlling force. Beyond the Kyntronics all-in-one control option, the functions mentioned above are included in the Kyntronics AOI for Rockwell Automation equipment.
Yes, any standard PID control can run the SMART electro-hydraulic actuator (SHA) for many applications. Our standard software is more advanced with multiple gain sets, multiple control modes, auto tuning etc.
There are several control options available for the SMART electro-hydraulic actuator (SHA). The “all-in-one” solution from Kyntronics includes a motor and servo drive/controller in an enclosure or on a subpanel that can be mounted in the customer’s enclosure. This solution includes software features developed by Kyntronics for most applications.
Servo Power Units offer similar control functionality used in SMART Electro-Hydraulic Actuators. The control configurations available are the “all-in-one” solution which includes a motor and servo drive/controller in an enclosure or on a subpanel that can be mounted in the customer’s enclosure. Servo Power Units are also available to connect with customer supplied motors and drives. All-in-one SPU control features include position control, force control position & force control, position control with force & speed Limiting and four quadrant motion control. In addition, multiple SPUs can be synchronized to provide coordinated motion of multiple cylinders. The all-in-one package includes software features developed by Kyntronics for most applications.
Yes. Servo Power Units incorporate optional pressure transducers on extend and/or retract that are used for force measurement. An external position sensor is used to measure cylinder or rotary actuator position. These signals are connected to the servo control and used for precise process control. The all-in-one control includes software to control the cylinder or rotary actuator to a specific position, or a specific force. Another advantage of the Servo Power Unit control system are software functions to control position and measure force, control force and measure position, and automatically switch from controlling position to controlling force and vice-versa. The most popular control method is Position control with Force Limit – meaning it will run in position control mode until a desired force is exceeded, then seamlessly switches to controlling force.
The maximum force a standard SMART electro-hydraulic actuator (SHA) can produce is approximately 85,000 Lbs. (377 kN). In applications where additional force is required, multiple SHAs are mounted in parallel and precisely synchronized by the controls. Kyntronics also has high force actuators with up to 150,000 Lbs. (665 kN) for specific applications. Contact Kyntronics for special requirements outside the above.
Kyntronics produces high speed actuators. The SMART electro-hydraulic actuator’s (SHA) maximum speed is determined by the cylinder size and pump size. Desired speed / force combinations can be found on our website. See SHA specifications for additional information.
SMART electro-hydraulic actuators (SHA) are available in any 1mm length increment including long stroke actuators (generally greater than 36” (914 mm)), the SHA includes design features that increase the robustness of the actuator such as larger diameter rods, thicker cylinder tube walls, and greater rod bearing length. Kyntronics has provided actuators exceeding 120” (3,048mm). Kyntronics performs the necessary calculations to ensure robustness, prevention of buckling etc. Contact Kyntronics for your specific requirements.
The standard SMART electro-hydraulic actuator (SHA) is rated at IP65 (dynamic and static). Higher IP ratings can be provided as needed.
Yes, depending on the environment, heating or cooling can be added as needed.
The SMART electro-hydraulic actuator (SHA) can be used in explosion-proof applications. Sensors are upgraded, and explosion proof motors are used in these cases.
Position measurement can be as simple as end-of-travel limit switches however, generally the SMART electro-hydraulic actuator (SHA) is used in configurations that incorporate an absolute position sensor that is mounted either outside the cylinder, or internally using magnetostrictve technology.
Standard position sensors used on the SMART electro-hydraulic actuator (SHA) provide up to +/- 0.001” accuracy.
For most applications, force is measured using a pressure transducer on either (or both) the extend side and retract side of the actuator. The pressure transducer is mounted in the fluid path that supplies pressure to either side of the piston. Force is calculated using πr² X the pressure of the system in PSI. With the SHA, using the pressure sensor is a very cost-effective way to accurately measure force as opposed to using expensive loadcells.
The pressure transducers used for force measurement are rated at 1% of full scale. The typical sensor used is rated at 3000PSI at 10V. For finer resolution, multiple sensors could be incorporated to switch between sensors as needed.
Yes. The SMART electro-hydraulic actuator (SHA) offers an internal position sensor that is mounted to the rear of the actuator and extends into the cylinder rod which is gun-drilled to accommodate the sensor probe. This sensor uses magnetostrictive technology. Internal sensors are typically used in applications where an external sensor would be subject to damage or contamination. Internal sensors can be used with cylinder rods 1 in or greater diameter.
Both the external and internal type of position sensor used on the SMART electro-hydraulic actuator (SHA) is magnetostrictive technology which is a form of non-contact measurement that is very precise and reliable.
The SMART electro-hydraulic actuator (SHA) uses a minimal amount of fluid. For example, a cylinder that produces 10,000 Lbs. of force with an 8” stroke only requires 14 oz of fluid, often less than the lubrication in a mechanical gearbox. The enclosed system used in the SHA eliminates the extensive maintenance required by traditional HPUs with hydraulic cylinders.
One of the unique advantages of the SMART electro-hydraulic actuator (SHA) is the multitude of configurations that are available. This benefits users because the SHA is better able to fit the available space envelope for more applications. This flexibility is due to the SHA using fluid to provide motion rather than using gears, drive screws and driven nuts that limit configuration flexibility. SHA configurations include parallel, in-line, right-angle and many others.
The SMART electro-hydraulic actuator (SHA) has many mounting and attachment options available. These options are for both the rod-end and actuator itself that accommodate most applications. You can find more details on the extensive number of SHA mounting options.
The SMART electro-hydraulic actuator (SHA) can be provided as an “actuator only” option to be used with the preferred motor of choice. The actuator only option is used when the motor and drive are provided by others. With this approach, Kyntronics provides the actuator with the motor mounting bracket and shaft coupling for the specific motor chosen to be used. Common motors used are Rockwell Automation/Allen Bradley, Siemens, Mitsubishi, and several others.
Kyntronics sizes the motor & drives as needed for the application when using our All-in-One solution. For Rockwell Automation customers, we provide the torque and speed required. Kyntronics is familiar with the Rockwell Automation motion analyzer and can assist when needed.
No. The SMART electro-hydraulic actuator (SHA) incorporates a hydraulic lock using check valves that hold the actuator in position when the motor stops. This locking mechanism also applies if power is lost to the SHA. Kyntronics also offers a solenoid lock option that provides additional functionality required by some applications.
Yes, food grade fluid is available upon request.
In those cases where the available space envelope will not allow the SMART electro-hydraulic actuator (SHA) to fit, Kyntronics offers a Servo Power Unit (SPU) product that incorporates all of the design characteristics of the SHA power unit while interfacing to a customer-supplied cylinder through hoses or pipe connections. The SPU includes the pump, manifold, valves, motor, servo drive/control and cabling and comes with quick connectors for attaching the hoses to the cylinder.
Yes, the SMART electro-hydraulic actuator (SHA) includes two pressure relief valves (one for extend and one for retract) that are standard on every actuator. This helps protect the actuator and the machine.
The maximum operating pressure of the SMART electro-hydraulic actuator (SHA) is 3,000 PSI. During the application engineering process, we will determine the typical operating pressure required by the application and factory-adjust the pressure relief valves accordingly.
SMART electro-hydraulic actuator (SHA) efficiency (mechanical power out vs. electrical power in) is approximately 70 – 80%. Compared with traditional hydraulics and screw-type actuators, the SHA is the highest efficiency actuator available and in many instances (based on internal testing), the SHA is up to 50% more efficient than screw-type actuators. This is because the SHA design locates the power transmission source (pump) very near the cylinder and there are no metal-to-metal contact points (all components ride on fluid). Several factors adversely impact efficiency in traditional hydraulics including constantly running HPUs with inefficient motors, losses in hoses, fittings, valves and other components that connect the HPU to the cylinders and many other conditions. The primary factors that impact screw-type actuator efficiency is the friction associated with metal-to-metal contact points including gears, screws, nuts, etc. For more information: https://www.ifpe.com/news/assessing-industrial-hydraulic-system-efficiency
The closed-cell foam used in the SMART electro-hydraulic actuator (SHA) allows for compensation of the fluid displaced by the volume of the cylinder rod. For example, when the rod is retracted, the extra fluid (compared to when the rod is extended) must be accommodated somehow since the SHA does not incorporate a separate accumulator. The extra fluid flows into the chamber where the closed-cell foam is located which compresses slightly to accommodate the fluid. When the actuator rod is extended, the foam returns to its normal condition. The amount of pressure in the foam chamber is less than 30PSI. The actuator is always under minimal pressure and it is important not to remove any components from the actuator or fluid could escape reducing the internal pressure that is required for the SHA to properly operate.
Servo Power Units (SPU) are most often used to connect with customer supplied cylinders or rotary actuators. The ability to connect to existing cylinders makes the SPU a great retrofit solution for both end users and machine builders who want the benefits the SPU can provide compared with traditional hydraulic power units including improved energy efficiency, lower maintenance, better ergonomics and improved process control. Read more about SPU controls and configurations.
The motor on the SMART electro-hydraulic actuator (SHA) is used bi-directionally. One direction to extend the rod and the opposite direction to retract the rod.
There are several features of the SMART electro-hydraulic actuator (SHA) designed to remove heat. Dual fans are used in conjunction with an efficient heat sink attached to the pump where the majority of the heat is generated. In addition, aluminum extrusions containing the reservoir foam conduct heat from the fluid. Finally, a temperature sensor attached to the pump with a connection to the control provides over-temperature protection. Kyntronics works with our customers to determine the optimal configuration of the SHA taking into account the force, speed and duty cycle of the application to minimize heat.
No. Due to the design of the SMART electro-hydraulic actuator (SHA) incorporating an integral hydraulic cylinder, the SHA is very robust when exposed to shock loads due to the shock-absorbing characteristics of hydraulics. Screw-type electro-mechanical actuators (EMA) incorporate gears, nuts, screws and other mechanical components that when exposed to shock loads, can fracture or have premature failure from these types of loading conditions.
The SMART electro-hydraulic actuator (SHA) incorporates a hydraulic lock using check valves that hold the actuator in position when the motor stops. This locking mechanism also applies if power is lost to the SHA. Kyntronics also offers a fail-safe solenoid lock option that provides additional functionality required by some applications.
The SMART electro-hydraulic actuator (SHA) is a closed and sealed system that does not require the hydraulic fluid to be changed. Unlike screw-type actuators, the SHA does not require periodic lubrication. The only scheduled maintenance is for a rod seal replacement around 50,000,000 inches of travel, similar to most cylinders. The threaded design of the rod seal components allows replacement in the field using a factory supplied seal kit. Periodic inspection of cabling, sensors and other peripheral components for wear or damage is of course a general best practice that is also recommended as would be performed on any type of equipment or machinery. If fans are installed, it is also recommended to monitor any debris that may block proper airflow use shop air to blow out any contamination
The SMART electro-hydraulic actuator (SHA) is a closed and sealed system that does not require the hydraulic fluid to be changed.
The SMART electro-hydraulic actuator (SHA) is a very robust solution. However, like any robust solution, it is important to properly install and utilize recommended programming techniques to prevent the SHA from continually running beyond stop limits and possibly damaging the unit. Kyntronics provides guidance and best practices for proper programming as part of our applications and commissioning assistance.
The Servo Power Unit (SPU) can be used to operate both double-acting linear cylinders or rotary actuators. The SPU connects to these devices through standard ISO 16028 connections.
Servo Power units operate on 240 or 460 VAC, and with DC voltages including 24, 36, 48, 60, and 80 VDC using the Kyntronics all-in-one control package. In this case, Kyntronics selects the appropriate servo motor and drive to accommodate the desired input voltage. For this reason and others, Servo Power Units are ideal upgrades for both industrial and mobile applications. We offer engineering assistance for any SPU application.
Shock loads and side-loading occur often in actuator applications. These conditions are particularly detrimental to actuator life causing pre-mature failure with screw-type electro-mechanical actuators (EMAs) that incorporate gears, nuts, screws and other mechanical components that when exposed to shock loads, can fracture or have premature failure. Hydraulic cylinders on the other hand, are very robust when exposed to shock loads. The fluid in hydraulic cylinders absorbs the impact from shock loads and the cylinder design allows for a larger bearing surface to protect itself against side-loading. The SMART Electro-Hydraulic Actuator (SHA) incorporates a hydraulic cylinder and has the same exceptional tolerance for shock loads and side-loading. More details about this issue are covered in the webinar: Side-loading, concentrated wear, fatigue failures, shock loads… no worries, the SHA has you covered.
The SMART Electro-Hydraulic Actuator (SHA) is a great solution. The SHA is a totally sealed (no air), self-contained actuator consisting of a cylinder, pump, manifold and servo motor, all in an integral package. There are no hoses or leak points on the SHA vs. a traditional hydraulic cylinder / HPU system. Functionally, the SHA retains the positive characteristics of traditional hydraulics such as high force density, tolerance for shock and side-loading, and robustness, while eliminating the negatives such as inefficiency, high energy usage, risk of leaks/environmental impact, noisy operation and difficulty/high cost to precisely control.
Hydraulic systems are known for their high-energy usage. Studies have shown that hydraulics use 3% of the overall energy used in the United States each year. Hydraulic systems consume a lot of energy for two primary reasons: first is that they are very inefficient. Studies have shown that the average hydraulic system is only 22% efficient. The second reason is that hydraulic systems generally run continuously regardless of whether they are doing work. The SMART Electro-hydraulic actuator (SHA) is an energy-saving alternative. SHA efficiency is rated at approximately 70% vs. 22% for a traditional hydraulic system. In addition, the SHA uses “power-on-demand” vs. continuous operation. SHA users have reported they have upwards of 10X in energy savings compared with the hydraulic systems they replaced. Get more details in our article: Reducing Total Cost of Ownership (TCO) While Improving Sustainable Manufacturing.
Hydraulic cylinders are available in 120” (3,048mm) stroke lengths and longer. Screw-type actuators are generally limited to 36” (914mm) and are very expensive above that length. SMART electro-hydraulic actuators (SHA) are available in any 1mm length increment as standard up to 120" (3,048mm). The SHA includes design features that increase the robustness of the actuator at longer stroke lengths such as larger diameter rods, thicker cylinder tube walls, and greater rod bearing length. Kyntronics has provided the SHA exceeding 120” (3,048mm) stroke as a special configuration. Kyntronics performs the necessary calculations to ensure robustness, prevention of buckling etc. Contact Kyntronics for your specific requirements or see the article on Long-stoke Actuators for Lifting Applications.
Metal-to-metal wear is a given with screw-type actuators since they are composed of gears, drive screws, driven nuts, and other components that mesh together. The key to extending reliability in these actuators is frequent, thorough lubrication and regular maintenance. Unfortunately, if the actuator is subject to any shock or side loading, lubrication will not extend life much or at all. The SMART Electro-Hydraulic Actuator (SHA) is frequently used to replace screw-type actuators that have failed. The SHA incorporates an integral hydraulic cylinder and is very robust when exposed to shock loads due to the shock-absorbing characteristics of hydraulics. SHAs do not require lubrication and do not have metal-to-metal contact points unlike screw-type electro-mechanical actuators.
Actuators of different types including pneumatic, hydraulic, screw-type electro-mechanical and servo-electro-hydraulic are used in presses and other equipment. The ability to control the actuator’s position, force, speed and acceleration/deceleration will vary depending of the type of actuator. Generally pneumatic and many hydraulic actuators run to stops or limit switches and are not precisely controlled. Screw-type and servo-electro-hydraulic actuators are often servo-controlled and can be precisely operated. Tool life can be greatly extended utilizing servo-type actuators that can precisely control position, speed, force and acceleration/deceleration ramps. Uneven loading often occurs in presses, material handling and other types of equipment. Incorporating two or more synchronized actuators in these cases can eliminate binding, even in severe uneven-load situations. The SMART Electro-Hydraulic Actuator (SHA) has been used successfully in numerous applications with uneven loading and have extended tool life significantly with the SHA’s precise control capabilities and ability to produce forces up to 85,000 Lbs (377kN) with a single actuator. Synchronizing two or more SHAs produces multiples of that amount of force. View a video demonstration of 4-Axis Lift System with Synchronized Motion Control.
Sustainable Manufacturing continues to gain momentum. Machinery choices affect sustainable outcomes and actuators specified for machines can have a measurable impact, both positively and negatively. Considering an example of machinery that typically use hydraulic cylinders and HPUs. There are significant factors to take into account when looking at alternative actuator technology. For example, when compared with traditional hydraulic systems, the SMART Electro-Hydraulic Actuator (SHA) is far more energy efficient, up to 10X better or even higher, due to the SHA’s power-on-demand feature and significantly higher efficiency. In addition, the totally sealed , leak-free SHA uses a minimal amount of fluid that does not need to be changed in contrast with hydraulics that leak and require fluid regular fluid changes with disposal of old fluid a major environmental. Get more details in our article: Reducing Total Cost of Ownership (TCO) While Improving Sustainable Manufacturing.
Servo Power Units (SPU) are an ideal solution for those instances where the All-In-One SMART Electro-Hydraulic Actuator (SHA) is not able to fit in the available space. The SPU provides many of the same benefits available in the SHA including precise position, speed and force control, energy efficiency, minimal fluid and compact size. The SPU connects to a customer-supplied cylinder through robust quick connect fittings. The SPU can be located close to the cylinder to create a compact footprint and reduce hose length. The SPU operates both linear cylinders and rotary actuators. This technology is a cost-effective electro-hydraulic power unit upgrade from a traditional hydraulic power unit in both industrial and mobile applications. It’s power-on-demand feature significantly reduces energy usage and the totally sealed design eliminates maintenance. Find more technical details about the Servo Power Unit.
