Introduction; Benefits; Main Power Connection Diagram - Hitachi RCU- 2015 Instruction Manual

2. Introduction

•
Vertical lifting machinery or high inertia loads like elevators, cranes, centrifugal fans
and centrifuges contain potential energy and inertial energy when operating. When
the motor is operated by an inverter, this energy is converted back into electrical
energy when the devices decelerate, lower or stop the load. This electrical energy,
called regeneration, flows back into the inverter's DC bus, causing the voltage to rise.
•
Traditionally, this regenerative energy is dissipated as heat through dynamic braking
resistors, and is therefore wasted.
•
The RCU series Regenerative Converter can provide up to 40% energy savings, by
reclaiming that regenerative energy and feeding it back into the AC supply.

3. Benefits

•
The RCU Regenerative Converter reduces electric power consumption by returning
the otherwise wasted energy to the AC power distribution network for use by other
loads.
•
Because there is no heat generated by braking resistors, the capacity of air
conditioning systems in the electrical room can be reduced, further reducing electric
power consumption.
•
Heat generated by braking resistors can cause secondary overheating problems for
adjacent systems should the equipment room air conditioner system have a problem.

4. Main Power Connection Diagram

Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
VFD
L1