Hitachi Introduces Microdrive Pump Sleep Mode Functionality

Hitachi America, Ltd., Industrial Systems Division, today announced the availability of Pump Sleep Mode functionality in its X200 and SJ200 Series Microdrives. The functionality is implemented utilizing only the inverter’s built-in PID control, logic and timing functions as a basis. Together with parameter settings, external jumper wiring is all that is required to realize the sleep mode operation.

Hitachi X200 Series AC Drives
  • Contactor-style package (power in at top/motor out at bottom)
  • Emergency stop function
  • Improved trip avoidance
  • Advanced logic and calculate functions
  • Suitable for side-by-side mounting
  • Patented micro-surge voltage suppression
  • Non-stop operation after instantaneous power failure
  • Built in RS-485 Modbus/RTU
  • Ratings ¼ to 3 hp, 230 V, single or 3-phase; 5 to 10 hp, 230 V, 3-phase; ½ to 10 hp, 460 V, 3-phase

Hitachi SJ200 Series VFD Inverters
  • New Intelligent Sensorless Vector Control - NO Autotuning Required!
  • Up to 200% Starting Torque
  • Most compact Hitachi inverter ever
  • Advanced Logic and Calculate functions
  • Removable terminal strips for easy wiring
  • Dynamic Braking transistor built in
  • Advanced trip avoidance functions
  • Removable Keypad
  • NEMA 4X Remote Keypad option
  • MODBUS RTU RS-485 built in
  • Ratings ¼ to 10hp, 230V, single and 3 phase, ½ to 10hp, 460V, 3 phase

Standard PID control may, depending on system demand, allow a pump to operate at undesirably low speeds for prolonged periods of time, which can cause mechanical issues with certain pump types. In general, it is a wasteful use of energy, since most pumps do not generate significant flow or head at low speeds. A means is needed to stop the pump when no pumping is actually taking place. The term “sleep mode” is used to describe such a means. The implementation requires no additional hardware beyond what is required for standard PID operation.

The simple set-up and wiring is described in an Application Note (AN080717-1) which is available to view or download in the Technical Support Library area of Hitachi America’s web site.

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