Rockwell Automation 1397 Regulated Field Supply Card - Manual (Page 4)

4 1397 Regulated Field Supply Card
1397 – 5.17 September, 1997
How This Option Works
(continued)
Control of Armature Voltage during field weakening can only occur
when a tachometer or encoder is used and
P.039 [Feedback Type] is not
set to Arm Volt. Field weakening can also be disabled by setting P.275
[Fld Auto Weak] to Disabled. The drive can also be operated in the
Constant HP (field control) Range, controlling parameter P.280 [Field
Reference] exclusively.
Both the Field Current Regulator and the Armature Voltage Regulator
contain Proportional plus Integral (PI) control. There is no user
configurable low limit parameter setting to these PI blocks. The low
limit is always fixed at 0°. The high limit however, can be set up to
180° delta using parameter
P.276 [Fld Delta Hi Lim] . This input allows a
full-on field voltage of 207V DC with a 230V AC line input, or 414V
DC with a 460V AC line input. To regulate higher field voltages, a
step-up transformer must be used to supply the AC side of the field
supply bridge. The output of the Field Current Regulator is an angle
to the regulated field supply gate firing circuit represented in degrees
by parameter
P.174 [Field Delta] .
How to Select a
Regulated Field Supply There are (3) Regulated Field Supply Cards to select from — 4, 10
or 15 Amps. Each Regulated Field Supply Card provides (3) different
gains for field current feedback — 1, 2 or 5.
When the Regulated Field Supply Card is installed, at Drive Setup,
the 1397 User Manual instructs the user to enter the rated hot field
amps from the motor’s nameplate into parameter
P.044 [Motor Field
Amps] . Once this value has been entered, the software will
automatically select the feedback gain from the board to produce the
largest full scale digital value in the A/D converter.
P.044 will be
limited to a value based on the Regulated Field Supply Card installed.
Important: Select the kit that provides the motor’s nameplate hot
field current — Including any current necessary for field forcing —
Required by your application.
Catalog Regulator P.044 Rated Field Current
Number Rating Value Gain Output Amps Resolution
1397-FS2004 4A 0.11-0.8A 5 0.8A 4mA
0.81-2.00A 2 2A 10mA
2.01-4.00A 1 4A 20mA
1397-FS2010 10A 0.28-2.00A 5 2A 10mA
2.01-5.00A 2 5A 25mA
5.01-10.00A 1 10A 50mA
1397-FS2015 15A 0.55-4.00A 5 4A 20mA
4.01-10.00A 2 10A 50mA
10.01-20.00A 1 15A 100mA