Rockwell Automation 1395 Digital DC Drive FRN 5-10.10/9.30 - Manual (Page 233)

Chapter 7
Programming Parameters
7-67
Parameter 739 – K Armature Volts [K Arm Volts]
Internal units : 10 x armature volts@ maximum A/D input
Programming Terminal units: None
Minimum Value: 3000
Maximum Value: 25000
Default Value: 12500
Description: A parameter whic
h scales the analog armature voltage
(
±
2.5 volt =
±
512 a/d value) into ten times the actual armature
voltage. K ARM VOLT should be equal to ten times the armature
voltage required to produce 5 volts on TP 27. The typical value
depends on the feedback board installed in the Drive. The typical
value for a 500 V feedback board is 12500 and the Typical value for a
240 V feedback board is 6400.
The Programming Terminal can be used to to determine the proper
value for K ARM Volt. With the motor rotating at some nominal
speed to produce armature voltage, enter the typical value for K ARM
VOLT. Measure the armature voltage to the motor while the motor is
rotating and compare it to the value on the Programming Terminal at
Parameter 105. Increase K ARM VOLT if the armature voltage read
from the Programming Terminal is low, or decrease it if the armature
voltage reading is too high.
Parameter 740 – K AC Volts [K AC Volts]
Internal units : 10 x AC volts@ maximum A/D input
Programming Terminal units: None
Minimum Value: 2000
Maximum Value: 15000
Default Value: 7225
Description: A parameter which scales the analog line voltage
feedback (5 volt = 1024 A/D value) into ten times the actual RMS AC
voltage. K AC VOLTS should be equal to ten times the line voltage
required to produce 5 volts on TP 4. The typical value depends on
the feedback board installed in the Drive. The typical value for a 460
V feedback board is 7225 and the typical value for a 230V feedback
board is 3800.
The Programming Terminal can be used to determine the proper value
for K AC Volt. Enter the typical value for K ARM VOLT. Measure
the line voltage to the Drive and compare it to the reading on the
Programming Terminal at Parameter 116. Increase K AC VOLT if
the armature voltage read from the Programming Terminal is low, or
decrease it if the line voltage reading is too high.