Rockwell Automation 20G PowerFlex SCR Bus Supply User Manual
Page 13
Overview
P-7
PowerFlex SCR Bus Supply User Manual
Figure P.3 1000A SCR Bus Supply Master Unit Schematic Diagram
The primary electrical components for the 1000A SCR Bus Supply Master
Unit are:
NOTE: There is no DC output fuse protection in the 1000A SCR unit.
>°C
F12
K1
A2
A1
F6
F2
F1
F4
F5
F3
F7-11
L1
L4
L5
L3
L2
K1
22
43
21
33
13
44
34
14
X1
GND
12
115
0
1
4
2
5
6
8
7
9
10
11
3
2
V3
4
5
3
2
V5
4
5
3
2
V1
4
5
3
2
V4
4
5
3
2
V6
4
5
3
2
V2
4
5
L1
L2
L3
PE
+
-
+
+
-
X3
X4
X6
2
1
X1
3
X3
X2
L1 L2
L3
1
1
8
7
5
4
2
X5
5
4
3
2
6
1
3
4
5
6
7
9
12
11
10
8
1 2
7 8
5
4
1 2
6
5
4
3
X2
7
8
9
10
11
12
1
2
3
4
5
6
1
5
M
N
GND
L1
Precharge
Board
Gate Driver Board
➋
➌
➊
➑
➐
➏
➍
➎
+DC
-DC
To Gate
Driver X4
on the Slave
(Figure P.4)
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.
➐
Gate Driver Board. The DC power supply is connected to a customer-supplied 115V AC Power
Supply.
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.