Owner manual

Chapter 4

Hardware Description

125 – 300 HP, 230VAC

250 – 600 HP, 460VAC

4-12

Field Pulse Transformer Boards (A5) – Figure 4.9 illustrates the major

hardware points on the board. The primary functions performed include:

• Isolate power bridge circuitry from control circuitry

• Provide dv/dt protection for 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 the DC bus.

Figure 4.9

Field Pulse Transformer Board Hardware Location

AB0660A

Field Pulse

Transformer Board

G11 G12

L3 L1

D10

G21 G22

MFG Revision No. Spare Parts Kit No.