Modulating control is thought to be constant movement of the positioning device. This is only true in a few instances. A motor operating 25 percent of the time would be considered excessive. The more important characteristic of modulating service is the ability to start, stop and reverse direction. Continuous duty motors without limitations on start, stop or reverse cycles provide REXA actuators with the ability to meet both criteria.

Xpac: More than a decade of research has placed the Xpac in the forefront of actuation. Considered by many as the best in the world, the Xpac offers control resolution as low as 0.05%, compact size, hard positioning and wide-ranging analog input. The separate control enclosure for the electronics allows the unit to be installed in locations that exhibit temperature extremes, vibration or a hazardous environment. To augment actuator operation, see a complete list of <OPTIONAL EQUIPMENT>.

Complete specifications are listed in the product bulletins:

• Xpac, Linear
• Xpac, Rotary
• Xpac, Drive

The Xpac has many features and benefits to fulfill most applications. The Literature Room has a complete list of available Technical Memos. We recommend some specific topics of general interest.

• STROKING SPEED- Xpac, Mpac
  The tortoise or the hare, both are winners with REXA/koso america inc
• SPRING FAILURE
  Security in the event of a power outage (also see PM21)
• HAZARDOUS AREA APPROVALS CODE: Div2 | Div1
  Available for any location (see TM19 for ambient temperatures)
• FREQUENCY RESPONSE
  When to turn the corner
• MANUAL OVERRIDE
  When electric power is unavailable, but the hydraulic system is on-line
• ADVANCED CONTROL OPTIONS
  Advanced software features to solve your specialized application
• TEMPERATURE GUIDELINES
  From the boiler front to the deep freeze

Mpac: Designed as a cost-effective actuator and drive for routine control applications, the Mpac offers 2% resolution, hard positioning and 4-20 mA input signal. The self-contained configuration and digital calibration make the Mpac quick to install and simple to wire with a single-step pushbutton setup. The no-maintenance Electraulic™ power module, total solid state controls and optional spring failure bring a dimension of safety and reliability not found in other electric units.

Complete specifications are listed in the product bulletins:
Mpac, Linear, Rotary & Drive

Additional information on the Mpac:

• STROKING SPEED- Xpac, Mpac
  The tortoise or the hare, both are winners with REXA/koso america inc
• SPRING FAILURE
  Security in the event of a power outage (also see PM21)
• MANUAL OVERRIDE
  When electric power is unavailable, but the hydraulic system is on-line