Current Limiting (Imax Controller) - Siemens MICROMASTER 440 Operating Instructions Manual

3 Functions
3.23.1.5

Current limiting (Imax controller)

Parameter range:
Warnings
Faults
Function chart number:
In the V/f characteristic mode, the drive inverter has a current limiting controller in
order to avoid overload conditions (Imax controller, refer to Fig. 3-100). This
controller protects the drive inverter and the motor against continuous overload by
automatically reducing the drive inverter output frequency by f
drive converter output voltage by V
voltage, the stressing on the drive inverter is reduced and it is protected against
continuous overload and damage.
Motor ovl fact [%]
10.0 ... 400.0 [%]
P0640.D (150.0)
Fig. 3-100
NOTE
The drive inverter load is only reduced when the frequency is reduced if the load
decreases at lower speeds (e.g. square-law torque – speed characteristic of the
driven load).
242
P1340 – P1346
r0056 bit 13
A0501
F0001
FP6100
Motor temperatur
Inverter temperatur
i 2 t inverter
Imax controller setpoint
r0067
Motor ovl fact [%]
CO: Outp cur limit [A]
10.0 ... 400.0 [%]
P0640.D (150.0)
Current feedback
r0068
CO: Output current [A]
Imax controller
(r1344). By either reducing the frequency or
Imax
Imax ctrl prp gain
0.000 ... 0.499
P1340.D (0.000)
Kp
?
+
Kp
Imax ctrl prp gain
0.000 ... 5.499
P1345.D (0.250)
MICROMASTER 440
Issue 10/06
(r1343) or the
Imax
Imax ctrl int time
0.000 ... 50.000 [s]
P1346.D (0.300)
Tn
CO:Imax ctrl Foutp
f
I_max
r1343
Tn
CO:Imax ctrl Voutp
U
I_max
r1344
Imax ctrl int time
0.000 ... 50.000 [s]
P1346.D (0.300)
Operating Instructions
6SE6400-5AW00-0BP0