Rockwell Automation 1395 Digital DC Drive - Manual (Page 29)

Publication 2361-5.01 July 1998
Product Overview 1-17
Field Power Components
The field power components work together to convert single-phase
AC power to a DC output used for powering your motor field.
The following items make up the field power circuitry:
• field bridge
• field-pulse transformer board
In addition, fuses, metal-oxide varistors (MOVs), and an inductor, as
shown in Figure 1.12, are used to protect the field bridge from
extreme current and voltage conditions. The field circuitry is fan-
cooled.
Note: The field power components are rated for voltages up to
460V AC. Drives with input voltages of 575 or 660V AC use a
single-phase field transformer (PT5) to step down the voltage to
460V AC. PT5, shown in Figure 1.12, is connected at the
customer site.
Figure 1.12
Field Bridge
8 9
TB1
Feedback Board (A1)
PM1
3MOV
FCT
CH1
1L1
1L3
PM2
2MOV
F -
Field-Pulse Transformer Board (A5)
G21 G22 F1 G11 F2 L1 L3 G12
Typical Transformer Arrangement
(used for 576 or 660V AC inputs)
575 or
660V
H1
H2
X1
X2
460V
1L1
1L3
Field Step-
Downl
Transformer
(PT5)
TB8
1
2
3
F +
TB7
1
3
F
1
F
4
F
2
F
3