Subscribe and listen to AW’s podcast!
Subscribe and listen to the Automation World Gets Your Questions Answered podcast!
Listen Here

Board Adds Pump Sleep Mode

The IPU-PSM option board, when installed in an L300P Series inverter, adds Pump Sleep Mode functionality to the standard built-in PID function.

Aw 3427 0811 Hitach
Why? Because standard PID control may, depending on system demand, allow a pump to operate at undesirably low speeds for prolonged periods of time. This can cause mechanical problems with certain pump types, and in general is a wasteful use of energy, because most pumps do not generate significant flow or head at low speeds. The IPU-PSM allows for the specification of a lower limit on inverter output frequency. Should the PID function call for a frequency below that limit for a user-defined period of time, the inverter will go to “sleep,” meaning the inverter output will shut off and the pump stops. If system pressure drops below a defined level for a specified period of time, the inverter will “wake” and resume normal PID pressure regulation.

Hitachi America Ltd.
www.hitachi.us
914.524.6615

Layers of Cybersecurity
Industry report on proven cybersecurity best practices. Understanding defense-in-depthand how it works.
Learn from field experience
Layers of Cybersecurity
Discover New Content
Access Automation World's free educational content library!
Unlock Learning Here
Discover New Content