New drives tailored for HVAC applications
A
HID product story
Edited by the Engineeringtalk editorial team
Jun 19, 2000
Hitachi's new L300P drives have been specially designed to deliver variable speed control to HVAC applications.
Typical fan and pump operations in HVAC applications often involve the unnecessary use of continuous, full-speed motor operation which results in inefficiency and needless energy expenditure.
As a result, Hitachi's new L300P series of voltage/frequency drives, from UK controls partner HID Limited, has been specially designed to deliver variable speed control to HVAC applications.
An automatic energy saving function delivers real-time savings by allowing fan and pump speeds to vary in accordance with demand.
Indeed, to further assist with monitoring and reducing energy use, the L300P comes with power consumption recorded within the drive and displayed as kWh.
Recognising that the HVAC sector presents many new applications for AC inverters, ease of installation and maintenance has been a primary focus in the L300P design.
Indeed, the L300P can be connected and run straight from the box.
Built into the drive are removable terminal rails, removable DC bus capacitors and a removable cooling fan.
Parameter setting, if required, can be effected by entering values for just a few simple parameters from the menu driven operator keypad which has just four keys, plus RUN and STOP.
While simple to use, the L300P is a powerful unit that boasts intelligent inputs, intelligent relay outputs and monitoring functions.
Automatic voltage regulation also accommodates fluctuating voltages on the input side and stabilises voltage on the output side.
Other features, which are normally expected of more expensive units, include PID control as standard, automatic energy saving and the ability to catch a spinning motor.
There is also an RS485 port for communications.
New "Trenchgate", technology enables lower power losses, higher current density and lower RFI emissions.
Coupled with the use of advanced controls programming that addresses the powerful 32-bit Hitachi RISC processor employed in the drive, the new techniques have allowed Hitachi to pack more power into a very compact package.
A measure of the size reduction can be seen by the fact that the 11W model measures just 210wide x 260 high x 178.5 deep, while the 22kW unit is 250mm wide x 390mm high x 198.5 deep.
Three-phase 200V class drives range from 11kW to 22kW with models up to 110kW available shortly, while 400V class drives range from 11kW to 55kW with models up to 400kW also available soon.
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