Rockwell Automation 1395 Digital DC Drive - Manual (Page 30)

Publication 2361-5.01 July 1998
1-18 Product Overview
Field Bridge
The field bridge uses four SCRs to convert the single-phase AC
power into a DC output. For the SCRs to conduct, they must be
forward biased and have a pulse applied to their gates. The SCR gate
is enabled by the field-pulse transformer board.
Field-Pulse Transformer Board
The field-pulse tranformer board provides the necessary gate voltage
and current to trigger the SCRs on. This board uses a resistor/
capacitor arrangement to protect the SCRs from rapid voltage
changes.
Figure 1.13
Field-Pulse Transformer Boards
Option 14FX
Standard
G22 G21
D8
J1
C3
R4
D7
F2
F1
L3 L1
R13
G12
R3
C2
G11
T1
T3
Connection to Power Stage
Interface (SCR Gate Pulses)
Connection to SCRs
in PM2 of Field
Connection to SCRs
in PM1 of Field Bridge
G22
Connection to Power Stage
Interface (SCR Gate Pulses)
Connection to SCRs
in PM2 of Field
Connection to SCRs
in PM1 of Field Bridge
G21
J1
R3 R4
C3 C2
T3 T1
T2
T4
G12 G11
F1 F2 L3 L1
R13
D8
D7
R11
R5