Reliance 2364f-um001_-en-p DC supply

Overview

The RGU is designed to be the regenerative front-end of a common  DC bus drive system. RGUs are available with 380V, 460V, and  575V 3-phase input voltages. Read this section for a general  description of RGU functionality and packaging.

Your RGU facilitates bi-directional power flow between the 3-phase  AC input and the common DC bus: 

• The RGU converts the incoming 3-phase, AC line voltage into a  regulated DC bus voltage by controlling the power flow to and  from the AC line. 

• The RGU converts an incoming 3-phase, AC line voltage into a  115V AC RGU control voltage via a basic capacity control  transformer (with optional increased transformer capacities  available if you desire to also supply control power to a 115V AC  control bus).

FD86N enclosure options permit direct connection to Bulletin 2100  CENTERLINE MCCs that: 

• are 20" deep 

• have 1.5"-high base channels 

• have the DC power bus and control bus (if selected) mounted at a  depth of 16.92" from the front of the MCC

The primary electrical components of your RGU are: 

• a 3-phase motor circuit protector, 3-phase circuit breaker, or a  3-phase motor-operated circuit breaker (depending upon RGU  rating) 

• AC line, current-limiting fuses 

• AC line reactors 

• a power structure 

• a main control board 

• an isolation board 

• a control power transformer 

• control transformer fusing (primary and secondary)

Descriptions of the Primary Electrical Components 

Motor Circuit Protector 

The motor circuit protector is the disconnect device between the RGU  and the 3-phase AC source, used to turn power to the system on and  off. It also provides magnetic overload protection. Motor circuit  protectors are standard features in J, K, and L-code RGUs. 

3-Phase Circuit Breaker 

The 3-phase circuit breaker is the disconnect device between the  RGU and the 3-phase AC source, used to turn power to the system on  and off. It also provides overcurrent trip and magnetic overload  protection. 3-phase circuit breakers are standard features in M and  N-code RGUs. 

AC Line, Current-Limiting Fuses 

AC line, current-limiting fuses are placed between the circuit breaker  (or motor circuit protector) and the RGU power structure. This fusing  protects the bridge from excessive currents and provides a currentlimiting action that permits a circuit breaker or motor circuit protector  (with a withstand rating less than 65,000A AC fault current available)  to effectively provide an AIC rating of 65,000A AC.  

AC Line Reactors 

AC line reactors reduce peak currents and harmonics in the AC line  and peak currents of the bridge circuit; they facilitate current flow  from the RGU to the 3-phase AC line during regeneration; and they  act as a known AC line impedance to the RGU which functions as a  power source while motoring or regenerating.  

RGU Power Structure 

The RGU power structure is the 3-phase power bridge which converts  the 3-phase AC power to DC and DC power to 3-phase PWM AC. 

If the RGU is precharged (main contactor closed) but not enabled  (RGU not modulating), the RGU functions as a simple six diode  3-phase rectifier. The six diodes are the freewheeling diodes inside  the IGBTs, which are capable of supplying 100% motoring current to  the DC bus.