CMT090

The work section is comprised of two independent 3 position 4 way spools that act to control two double acting services. Each spool can control a double acting cylinder or bi-directional motor.

Demands to each work section are transmitted over a CAN bus and power is provided to each work section via a single daisy chain cable arrangement. Each work section has a single pilot valve comprised of on-board electronics, embedded sensors, and two independent 3 position 4 way pilot spools driven by a low power embedded micro controller.

The independent pilot spools control the mainstage spools. Closed loop control of each work section is done locally by leveraging the on-board electronics and sensors.

Each mainstage spool has its own position sensor enabling closed loop position control of the mainstage spool. Further, a pressure sensor is located in each service measuring meter-in pressures, pressure line, load sense line and tank line.

The CMT work section is pre-compensated which means the compensator spool is located before the main metering spool. Pressure differential acting on the compensator spool is picked from either side of the main metering orifice. The compensator spool for each service receives a load sense signal from the respective service. The pressure differential across the main metering orifice is maintained by the compensator, resulting in a constant flow rate through the valve that is independent of load pressure.

Features and benefits

• Pressure compensated meter-in and meter-out control
• Precise close loop control
• Sub-micron hysteresis
• High valve responsiveness
• Flow sharing - pre and post compensation capabilities
• Flexibility in configuration with easily changed parameters
• Command factory-calibrated flow from either work port
• Easy to use CAN communication with the valve
• Reduced load on the vehicle CAN bus
• Advanced diagnostics for improved reliability and productivity
• Hose burst detection
• Limp mode
• Inlet, tank, load sense, and work port pressures, spool position, consumed flow and oil temperature
• Platform can support future software development for future product development
• Reliable performance across a broad temperature range

Additional features and benefits with CMA work section

• Independent metering control
• Advanced force and flow, control modes
• Intellifloat and boom stability control capabilities
• Command factory-calibrated pressure from either work port
• Reduction in metering losses / energy management