Rockwell Automation 1397 Regulated Field Supply Card - Manual (Page 13)

1397 – 5.17 September, 1997
1397 Regulated Field Supply Card 13
Installation
(continued)
Setup The following parameters are grouped by Regulated Field Supply
Card function. Depending upon the application, not all parameters
must be changed from the parameters’ default settings. Parameter
P.044 [Motor Field Amps] however, must always be reset to accommodate
the Regulated Field Supply Card.
Field Loss Parameters
P.044 [Motor Field Amps]
P.274 [Fld Econ Ref]
P.277 [Fld Loss Level]
When the Regulated Field Supply is operating in the fixed voltage
mode, field loss detection will only occur if there is a complete loss
of field current.
When the field current regulator is controlling field current, and the
Regulated Field Supply Card is not operating in the fixed voltage
mode, a field current loss fault will be generated when the field
current drops below the value set for parameter
P.277 [Fld Loss Level] .
The same field feedback signal used by the Regulated Field Supply
Card is used by the field loss detection circuit. Field current feedback
is compared against the value entered in parameter
P.277 [Fld Loss Level] .
If feedback < P.277 , a fault will be generated. P.277 is entered as a
percentage of parameter P.044 [Motor Field Amps] . P.274 [Fld Econ Ref] must be
set > P.277 [Fld Loss Level] to avoid field loss faults.
A field loss fault will also occur if the digital value on the A/D
converter reaches full scale — Approximately 28% above the rated
field output.
Important: Regulator Board Jumper J20 is designed to allow the
motor field winding to be separately excited. Jumper J20 is ignored if
the Regulated Field Supply Card is installed. Placing J20 in the
Disable position will not disable field loss detection.
❏ 10 If required, reinstall the auxiliary panel cover or AC line
disconnect removed in steps 4a & 4b. Torque the (3) bus bar
fasteners to the values listed below.
Fastener Size Maximum Torque
1 ⁄ 4 ” 7.46 N-m (66 lb.-in.)
3 ⁄ 8 ” 26.66 N-m (236 lb.-in.)