6-22
Programming Your Application
590+ Series DC Digital Converter
CURRENT PROFILE
Use this to clamp the current limit for applications
where motors have a reduced ability to commutate
armature current at low field currents.
Normally this is required when using Field Weakening,
although some motors exhibit commutation limitations
at higher speeds even with rated field current.
The input to the block is SPEED FEEDBACK from the SPEED LOOP function block. The
output of the block changes the current limit clamp in the current loop.
x
When SPEED FEEDBACK exceeds SPD BRK 1 (LOW), the current profile begins
scaling the current limit as set by IMAX BRK 1 (SPD1).
x
As the SPEED FEEDBACK increases toward SPD BRK2 (HIGH), the current limit is
reduced linearly toward IMAX BRK2 (SPD2).
x
When the speed exceeds SPD BRK2 (HIGH), the current limit remains at the IMAX
BRK2 (SPD2) setting.
IMAX BRK 1 (SPD1)
IMAX BRK 2 (SPD2)
SPD BRK 1 (LOW)
SPD BRK 2 (HIGH)
Current Limit
Speed Feedback
MMI Menu Map
1
SETUP PARAMETERS
2
CURRENT PROFILE
SPD BRK1 (LOW)
SPD BRK2 (HIGH)
IMAX BRK1(SPD1)
IMAX BRK2(SPD2)
Current Profile
100.0 %
–
[ 32] SPD BRK 1 (LOW)
100.0 %
–
[ 31] SPD BRK 2 (HIGH)
200.0 %
–
[ 93] IMAX BRK 1 (SPD1)
200.0 %
–
[ 33] IMAX BRK 2 (SPD2)
Parameter
Tag
Range
SPD BRK 1 (LOW)
32
0.0 to 100.0 % (h)
(SPD BRK1 (LOW))
This is the motor speed at which current limit profiling begins.
SPD BRK 2 (HIGH)
31
0.0 to 100.0 % (h)
(SPD BRK2 (HIGH))
This is the upper speed limit at which current limit profiling ends.
IMAX BRK 1 (SPD1)
93
0.0 to 200.0 % (h)
(IMAX BRK1(SPD1))
This sets the current limit value at or below speed break-point 1, provided the other current
limit clamps (inverse time overload, bipolar clamps and main current clamps) are greater
than this setting.
IMAX BRK 2 (SPD2)
33
0.0 to 200.0 % (h)
(IMAX BRK2(SPD2))
This sets the current limit value at or above speed break-point 2, provided the other current
limit clamps setting (inverse time overload, bipolar clamps and main current clamps) are
greater than this.