Descriptions and schematic diagrams – Rockwell Automation 20G PowerFlex SCR Bus Supply User Manual
Page 11
Overview
P-5
PowerFlex SCR Bus Supply User Manual
Descriptions and Schematic
Diagrams
The SCR Bus Supply is a single-direction power converter for the front end
of common DC bus drive systems. It converts the incoming 3-phase AC line
voltage to a common DC bus voltage.
Figure P.1 400A and 600A SCR Bus Supply Schematic Diagram
The primary electrical components for the 400A and 600A SCR Bus Supply
are:
>°C
V1
V3
V4
V2
V6
F6-F8
G4
K4
G1
K1
K3
G3
K6
G6
G2
K2
G5
K5
F1
F2
F3
V5
4
5
6
7
5
4
6
PE
L1
L2
L3
GND
K1
A2
A1
1
X1
3
X3
X2
L1 L2 L3
1
1
8
7
5
4
2
5
4
3
2
6
M
N
GND
L1
X1
12
115
0
1
4
2
5
6
8
7
9
10
11
F12
K1
22
43
21
33
13
44
34
14
F5
F4
➋
➌
➊
➑
➏
➍
➎
Precharge
Board
+DC
-DC
Item Description
➊
Six-Pulse, Full-Wave, 3-Phase SCR Bridge Rectifier Unit connected to the line input and DC
Bus output terminals through semi-conductor protection fuses with trip indicator switches.
➋
Bus Supply Overtemperature Sensor located on the heat sink for thermal protection of the
SCR bridge rectifier.
➌
RC snubber circuit routed to the three input phases through semi-conductor protection
fuses with trip indicator switches.
➍
MOV snubber circuit routed to the three input phases.
➎
Precharge Board
➏
Enable Contactor (K1) for the precharge board.
➑
Cooling Blower connected to a customer-supplied 115V AC Power Supply. The customer’s
controls must, at a minimum, command the blower to run whenever contactor K1 is enabled.