Rockwell Automation FlexPak 3000 Power Module Version 4.2 - Manual (Page 137)

APPENDIX B
49’1340 e FlexPak 3000 B-33
WARNING:
When analog inputs or network registers are used to control current limits, bipolar values are
permitted for the positive and negative current limits of the current and speed loops. Extreme care
must be exercised when setting the current limit values in this case. If the negative current limit is set
to a non-zero value, the current loop reference will be clamped to this minimum value, possibly
causing unexpected motor or machine operation, including rapid acceleration or overspeed.
Failure to observe this precaution could result in bodily injury.
If you change NEG CUR LIM INV EN (P.226), POS CURRENT LIM SEL (P.223) and NEG CURRENT LIM SEL
(P.224) are automatically set to REGISTER . When this occurs, an alarm (A00052) is generated to notify
you of a possible change in the current limits. Make sure the settings of POS CURRENT LIM SEL (P.223),
NEG CURRENT LIM SEL (P.224), POSITIVE CURRENT LIM (P.005), and NEGATIVE CURRENT LIM (P.006) are
correct for your application before operating the drive.
Typically the state of the inverter should only change state during drive setup. Therefore, this should be
an infrequent event.
The positive limit register will always remain in the range 0 to MAXIMUM CURRENT.
The absolute value of the negative limit register would be constrained to the range 0 to MAXIMUM
CURRENT. The sign of the negative current limit value will be automatically adjusted according to the
state of the negative current limit inverter. For example, if the inverter is enabled and the negative
current limit is 10.0 A, then the negative current limit will be changed to -10.0 A when the inverter is
disabled. The negative limit register value will be clamped to zero for non-regenerative drives.
DRIVE TYPE
REGEN NON-REGEN
low limit high limit. low limit high limit
Positive 0 Maximum 0 Maximum
ENABLE Current Lim Current Current
Inverter Negative 0 Maximum 0 0
State Current Lim Current
Positive 0 Maximum 0 Maximum
DISABLE Current Lim Current Current
Negative -Maximum 0 0 0
Current Lim Current'
(SPD LOOP OUTPUT)
PI
KP HI
WLD LO
POSITIVE CURRENT LIM
POS CURRENT
LIM SEL
*REGISTER
ANALOG IN 1
ANALOG IN 2
NETW IN REG 1, 2, 3
From Network
From I/O Expansion
Inputs Block Diagram
{
P.005
P.299
P.223
NEGATIVE
CURRENT LIM
ANALOG IN 2
NETW IN REG 1, 2, 3
From Network
From I/O Expansion
Inputs Block Diagram
{
NEG CURRENT
LIM SEL
*REGISTER
ANALOG IN 1
EN
P.006
P.224
(A)
(B)
(B)
(A)
INIT
RST
SPEED LOOP CURRENT LOOP
HI
LO
LIMIT
P.005
EN
NEG CURRENT LIM INV EN 3)
P.226
POS CURRENT LIM
* SPD LOOP CUR LIM
REGISTER
CML REF LIMIT
SELECT
P.311
* SPD LOOP CUR LIM
REGISTER
CML REF LIMIT SELECT
P.311
NEG CURRENT LIM
P.006