Rockwell Automation FlexPak 3000 Power Module Version 4.2 - Manual (Page 136)

APPENDIX B
FlexPak 3000 49’1340 e B-32
NEG CURRENT LIM SEL (P.224)
Selects the source for the negative current limit. If REGISTER is selected, NEGATIVE CURRENT LIM
P.006 is used as the limit. The analog input choices are only available if the I/O Expansion kit is
installed. The NETW choices are only available if the Network Option kit is installed.
Parameter Range: REGISTER, ANALOG IN 1, ANALOG IN 2,
NETW IN REG 1, NETW IN REG 2, NETW IN REG 3
Default Setting: REGISTER
Parameter Type: Configurable
OIM Menu Path(s): Speed/Voltage Loop (SPD) - Speed/Voltage Loop (SPD) Tuning
or Current Minor Loop (CML) - CML Tuning
Refer also to Parameters: NEGATIVE CURRENT LIM (P.006),
NETW IN REG 1 (P.902),
NETW IN REG 2 (P.903),
NETW IN REG 3 (P.904)
NEG CUR LIM INV EN (P.226)
This parameter enables the negative current limit inverter to the speed loop PI block.
Parameter Range: 1= DISABLE
2= ENABLE
Default Setting: 2
Parameter Type: Configurable
OIM Menu Path(s): Additional Parameters
Refer also to Parameters: POSITIVE CURRENT LIM (P.005)
NEGATIVE CURRENT LIM (P.006)
See P.006 NEGATIVE CURRENT LIM for detail on the operation of this parameter and the drive current
limits.
NEGATIVE CURRENT LIM (P.006)
NOTE: This parameter is only set for regenerative drives.
Selects the highest amount of current (% motor rated armature amps) for the reverse bridge.
Also used as a low limit for the Speed Loop PI block output.
Parameter Range: see table on next sheet
Default Setting: 150 % FLA
0 for non-regenerative drives; if FEEDBACK SELECT = AC TACH;
if FEEDBACK SELECT = PULSE TACH
and PULSE TACH QUADRATURE = OFF, see table below
Parameter Type: Tuneable
OIM Menu Path(s): Speed/Voltage Loop (SPD) - Speed/Voltage Loop (SPD) Tuning
Current Minor Loop (CML) - CML Tuning - Quick Start
Refer also to Parameters: FEEDBACK SELECT (P.200)
PULSE TACH QUADRATURE (P.208)
Regardless of the state of the negative current limit inverter (see NEG CUR LIM INV EN (P.226)), the
register limits (POSITIVE CURRENT LIM and NEGATIVE CURRENT LIM) will always remain in a user-
specified safe range. The intent of the current limit registers when chosen as the source for the current
limit values, is to statically limit the drive current to a range which is consistent with the normal operation
of the drive-motor application.
The purpose of the negative current limit inverter is to add flexibility to applications such as web
processes which primarily use either an analog input or network register to dynamically control the
drive's current limits while running as a speed regulator.