Description and schematic diagram – Rockwell Automation 20T PowerFlex Diode Bus Supply User Manual
Page 11
Overview
P-5
PowerFlex Diode Bus Supply User Manual
Description and Schematic
Diagram
The Diode 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 Diode Bus Supply Schematic Diagram
The primary electrical components for the Diode Bus Supply are listed
below.
NOTE: Components ➌, ➍, and ➎ compose a Radio Frequency Interference
Filter (RFI), which meets the EMC requirements of Product Standard
61800-3 for industrial environments.
Item Description
➊
Six-Pulse, Full-Wave, 3-Phase DIode Bridge Rectifier Unit directly connected to the three
line input terminals.
➋
Bus Supply Overtemperature Sensors, located in the heat sink, are used for thermal
protection of the diode-bridge rectifier.
➌
DC Chokes (L1, L2) to reduce conducted HF-emissions. They also reduce line harmonics and
peak currents in the AC line and the bridge circuit.
➍
Input Filter Capacitors connected to the three input phases to reduce conducted
HF-emissions.
➎
Common Mode Capacitors connected to the DC bus to reduce conducted HF-emissions.
➏
DC Bus Snubber Circuit for dampening and limiting overvoltages.
➐
MOV Circuit connected to the three input phases.
➑
Cooling Fans connected to the 24V DC supply on the Power Supply (DFPS Board).
+DC
-DC
S/L2
R/L1
T/L3
L1
L2
J4
8
9
TB1
TB1
GND
12
PE
J3
J1
J6
J2
7
4
1
2
1
5
1
1
4
DC
DFPS Board
24V
M1
M2
MOV
10
11
TB1
>˚C
F1
>˚C
F2
To
Common
DC Bus
To
Earth
Ground
To
Incoming
3ø Power
➋
➌
➊
➑
➐
➏
➍
➎