Rockwell Automation 1395 DC Drive, 800-1250 Hp, FRN 5.XX-9.30 - Manual (Page 143)

Chapter 5
Programming Parameters
5-52
Parameter 679 – Field Current at 2/8 Flux [Fld I @ 2/8 FLUX]
Internal units : 4096 = 1000h = 100% rated field current
Programming Terminal units: None
Minimum Value: 0%
Maximum Value: 100%
Default Value: 14.3%
Description: This is the third entry in a 9 element lookup table for
converting flux reference commands to field current reference. The
lookup conversion is used to linearize the field current reference with
respect to flux. This value corresponds to the field current required to
produce 25% armature volts when the motor is running at base speed
and is in terms of internal units where 4096 = 100% rated field
current.
Parameter 680 – Field Current at 3/8 Flux [Fld I @ 3/8 FLUX]
Internal units : 4096 = 1000h = 100% rated field current
Programming Terminal units: Percent rated field current
Minimum Value: 0%
Maximum Value: 100%
Default Value: 23.1%
Description: This is the fourth entry in a 9 element lookup table for
converting flux reference commands to field current reference. The
lookup conversion is used to linearize the field current reference with
respect to flux. This value corresponds to the field current required to
produce 37.5% rated armature volts when the motor is running at base
speed and is in terms of internal units where 4096 = 100% rated field
current.
Parameter 681 – Field Current at 4/8 Flux [Fld I @ 4/8 FLUX]
Internal units : 4096 = 1000h = 100% rated field current
Programming Terminal units: Percent rated field current
Minimum Value: 0%
Maximum Value: 100%
Default Value: 33.1%
Description: This is the fifth entry in a 9 element lookup table for
converting flux reference commands to field current reference. The
lookup conversion is used to linearize the field current reference with
respect to flux. This value corresponds to the field current required to
produce 50% rated armature volts when the motor is running at base
speed and is in terms of internal units
where 4096 = 100% rated field
current.