Rockwell Automation 1395 Digital DC Drive FRN 5-10.10/9.30 - Manual (Page 140)

Chapter 6
Installation
6-16
3. If the DC motor field is not compatible with the field DC output of the
drive, an external field control transformer must be used. Refer to the
following example for transformer selection information.
EXAMPLE: 10 HP, 240 Volt Armature, 17.2A, 240 Volt Field, 2.0A
a) The Field Control Transformer will have 230V primary, 460V
secondary, single-phase 60 Hz.
b) kVA = 2A x 460VAC x 1.5 = 1.38 kVA (1.5 kVA is closest)
c) J1 – Field jumper selection is in location 3 as the motor field is 2A.
d) Rated Field Motor Current (parameter 612) to be programmed “2” as
stamped on the motor nameplate.
e) Rated Field Bridge Current (parameter 616) to be programmed “2.1”
as explained in Chapter 8.
f) Refer to Figure 6.11 and both NEC code and local codes for fusing
requirements.
g) On 1–30 HP 230 volt and 2–60 HP 460 volt, remove factory
installed wires at TB1-1 and TB1-2 on the power board and remove
these same wires at the other end at 1L1 and1L3 on the drive side of
the main fuses. Wire the transformer as shown in Figure 6.11.
ATTENTION: The motor field supply is phase sensitive. To
guard against possible drive/motor damage, ensure that the
connections are properly made according to Figure 6.9.
!
Figure 6.9
Power Connections – Standard Field Voltage
TB2
3 4
TB1
L1 L2 L3
1
2
3
4
5
1 2
DC Motor Shunt Field*
F+ F–
M
A1+ A2
A1 A2
Fuses
* Typical motor connection. Refer to motor
data for specific motor connections.
DC Contactor
Line Reactor or
Isolation Transformer
DC Motor Armature*
TOP VIEW OF
DRIVE
40–100 HP, 230VAC
75–200 HP, 460VAC
Series A
IMPORTANT
If the AC input power system does
not have a neutral or one phase
referenced ground, an isolation
transformer with the neutral of the
secondary grounded is highly
recommended. If the line-to-line
voltages on any phase can exceed
125% of the nominal line-to-line
voltage, an isolation transformer
with the neutral of the secondary
grounded, is always required.
L1
L3
5 6 7 8 9 10 (Spare)
TE PE
F4
F5
F6
F7
F8