Rockwell Automation 2364E Non-Regenerative DC Bus Supply Unit (NRU) - Manual (Page 19)

Publication 2364E-5.01 April 2002
Overview 1-5
NRU Conceptual Schematic
Customer-supplied, 3-phase AC power is supplied to the system as
shown on the left side of the NRU schematic shown in Figure 1.1.
All three phases are fused and then connected to the diode-bridge
rectifier, as shown. The diode-bridge rectifier is also connected
through DC bus chokes to the DC bus.
Two of the three AC input phases are routed through primary control
transformer fusing to the control transformer. The secondary of the
control transformer, which supplies the NRU control power, can be
connected to the control bus after fusing if the control transformer is
sized accordingly. The bridge fan is connected to the NRU control
power.
Figure 1.1
Conceptual Schematic of the NRU
M
D C
B u s
Bus
Voltage
Light
(Optional Air-Flow
Sensor)
DC +
Choke
DC -
Choke
+
-
Diode Bridge
Control
Transformer
Fuses
Circuit
Breaker
or MCP
3-Phase AC
Incoming
Power
L
L
N N
115V AC
NRU Control
Power
To Optional
115V AC
Control Bus
Bridge
Fan
Motor
(This fuse included in control
power source upgrade options)
N R U