Siemens 440 - Manual (Page 164)

Parameter Description Issue 01/06
MICROMASTER 440 Parameter List
164 6SE6400-5BB00-0BP0
3.29.1.3 Imax controller
P1340[3] Imax freq. controller prop. gain Min: 0.000
CStat: CUT Datatype: Float Unit: - Def: 0.000
P-Group: CONTROL Active: Immediately QuickComm.: No Max: 0.499
Proportional gain of the I_max frequency controller.
The Imax controller reduces inverter current if the output current exceeds the maximum motor current
(r0067).
In linear V/f, parabolic V/f, FCC, and programmable V/f modes the I_max controller uses both a frequency
controller (see parameters P1340 and P1341) and a voltage controller (see parameters P1345 and P1346).
The frequency controller seeks to reduce current by limiting the inverter output frequency (to a minimum of
the two times nominal slip frequency). If this action does not successfully remove the overcurrent condition,
the inverter output voltage is reduced using the I_max voltage controller. When the overcurrent condition
has been removed successfully, frequency limiting is removed using the ramp-up time set in P1120.
t
t
 f

1
-controller active I
max
t
r0067
0
r0056 Bit13
A0501
Motor current
In linear V/f for textiles, FCC for textiles, or external V/f modes only the I_max voltage controller is used to
reduce current (See parameters P1345 and P1346).
Index:
P1340[0] : 1st. Drive data set (DDS)
P1340[1] : 2nd. Drive data set (DDS)
P1340[2] : 3rd. Drive data set (DDS)
Note:
The I_max controller can be disabled by setting the frequency controller integral time P1341 to zero. This
disables both the frequency and voltage controllers. Note that when disabled, the I_max controller will take
no action to reduce current but overcurrent warnings will still be generated, and the Drive will trip in
excessive overcurrent or overload conditions.
P1341[3] Imax freq. ctrl. integral time Min: 0.000
CStat: CUT Datatype: Float Unit: s Def: 0.300
P-Group: CONTROL Active: Immediately QuickComm.: No Max: 50.000
Integral time constant of the I_max controller.
P1341 = 0 :
I_max frequency and voltage controllers disabled
P1340 = 0 and P1341 > 0 :
frequency controller enhanced integral
P1340 > 0 and P1341 > 0 :
frequency controller normal PI control
See description in parameter P1340 for further information.
Index:
P1341[0] : 1st. Drive data set (DDS)
P1341[1] : 2nd. Drive data set (DDS)
P1341[2] : 3rd. Drive data set (DDS)
Level
3
Level
3