Rockwell Automation 1395 Digital DC Drive FRN 5-10.10/9.30 - Manual (Page 28)

Chapter 2
Hardware Description
1 – 30 HP, 230VAC 2 – 60 HP, 460VAC
2-6
Power Board The operation of the Power Board components (Figures 2.5 and 2.6) is
detailed here:
Gate Firing Pulses – The function of the Power Board is to provide the
gate firing pulses for the armature and field bridges.
Transient Voltage Protection – The Power Board provides protection
against line voltage spikes and transients (dv/dt) for the armature and field
SCRs.
Bus Bar – The Power Board acts as an interface board between the SCRs
and the Bus Bar. All armature SCR connections terminate at the bus bar
mounted on the power board.
Feedback Circuitry – All voltage related feedback circuitry is contained
on the Power Board. All signals are attenuated to logic level voltage.
Field Connections – All user motor field connections are located on
TB1on the bottom left edge of the Power Board (Fig. 2.6).
Figure 2.5 shows the location of the power board in the drive, while Figure
2.6 illustrates the power board layout outlining the relevant components for
user interface.
Figure 2.5
Power Board Location
Power Board
PSI/Switcher Board
Main Control Board