User guide

Chapter 2
Hardware Description
2-11
Field Pulse Transformer and Snubber Board (A5) – The primary
functions of the Field Pulse Transformer and Snubber Board (Figure 2.9)
include:
• Isolate field bridge circuitry from control circuitry.
• Provide dv/dt protection across SCRs.
The board is physically mounted on the field power bridge buswork, with
the screw terminals used to mount the board also being used as the
connections to the incoming AC line and DC bus.
Figure 2.9
Field Pulse Transformer and Snubber Board Hardware Location
R1
R3
T1 T2
C1
G1 G2
Connection to SCRs
in PM7 of Field Bridge
L3 L1
F1
F2
G1 G2
Connection to SCRs
in PM8 of Field Bridge
R4
J1
Connection to Power Stage
Interface (SCR Gate Pulses)
MFG
Revision No.
Assembly
Part No.
C2
R5
T3 T4