Parameter List Edition 04/03 SINAMICS G110 - Automatyka Siemens

Parameters 04/03
P1335 Slip compensation Min: 0.0
CStat: CUT Datatype: Float Unit: % Def: 0.0
P-Group: CONTROL Active: Immediately QuickComm.: No Max: 600.0
Level
3
Dynamically adjusts output frequency of inverter so that motor speed is kept constant independent of motor
load.
In the V/f-control, the motor speed will always be less than the command speed due to the slip speed. For a
given speed command, the speed will drop as load is increased. The speed regulation of drive can be
improved by the technique known as slip compensation.
Increasing the load from M1 to M2 (see diagram) will decrease the motor speed from f1 to f2, due to the
slip. The inverter can compensate for this by increasing the output frequency slightly as the load increases.
An increase of the output frequency from f_out_M1 to f_out_M2 will result in a motor speed at f1 for load
M2. The inverter measures the current and increases the output frequency to compensate for the expected
slip. P1335 can be used to enable and fine-tune the slip compensation.
Without Slip compensation
M
M
With Slip compensation
M 2
M 2
M 1
M 1
Value:
∆f
f 2
f 1
P1335 = 0 % :
Slip compensation disabled.
f
∆f
f 2
f 1
f out M2
f out M1
f
P1335 = 50 % - 70 % :
Full slip compensation at cold motor (partial load).
P1335 = 100 % :
Full slip compensation at warm motor (full load).
Notice:
The applied value of the slip compensation (scaled by P1335) is limited by following equation:
f Slip
_ comp _ max
= 2.5 ⋅ r0330
P1340 Imax controller prop. gain Min: 0.000
CStat: CUT Datatype: Float Unit: - Def: 0.000
P-Group: CONTROL Active: Immediately QuickComm.: No Max: 0.499
Level
3
Proportional gain of the I_max controller.
Dynamically controls the inverter if the output current exceeds the maximum motor current (r0067). It does
this by first limiting the inverter output frequency (to a possible minimum of the nominal slip frequency). If
this action does not successfully remove the overcurrent condition, the inverter output voltage is reduced.
When the overcurrent condition has been removed successfully, frequency limiting is removed using the
ramp-up time set in P1120.
P1800 Pulse frequency Min: 2
Level
CStat: CUT Datatype: U16 Unit: kHz Def: 8
3
P-Group: INVERTER Active: Immediately QuickComm.: No Max: 16
Sets pulse frequency of power switches in inverter. The frequency can be changed in steps of 2 kHz.
Dependency:
Minimum pulse frequency depends on P1082 (maximum frequency) and P0310 (rated motor frequency).
Note:
The maximal frequency P1082 is limited to pulse frequency P1800 (see P1082).
If the pulse frequency is increased, max. inverter current r0209 can be reduced (derating). The derating
characteristic depends on the type and power of the inverter (see manuall OPERATING INSTRUCTION).
If silent operation is not absolutely necessary, lower pulse frequencies may be selected to reduce inverter
losses and radio-frequency emissions.
Parameter List SINAMICS G110
66 6SL3298-0BA11-0BP0