Siemens Micromaster 420 Operating Instruction page 81

5. SYSTEM PARAMETERS
Parameter
Number
Notes
Setting the Starting Boost too high will cause the inverter to go into Current Limit, which in
turn restricts the output frequency to below the setpoint frequency.
Increasing the Boost Levels increases the heating of the motor.
Refer to note in P1310 with respect to Boost priorities.
The achievable boost value is limited by the setting in P0640.
Σ Boosts < 300/I mot * R S
P1335 Slip compensation
Adjusts the output frequency of the inverter dynamically, so that the motor speed is kept
constant independent of the motor load.
0% =
100% =
Note
The gain value can be adjusted if necessary to fine-tune the actual motor speed.
P1336 Slip limit
Limits the compensation slip added to the frequency setpoint when slip compensation is
active.
P1800 Pulse frequency
Sets the pulse frequency of the power switches in the inverter. The frequency can be
changed in steps of 2 kHz.
If silent operation is not absolutely necessary, it is possible to reduce inverter losses and
radio-frequency emissions by selecting lower pulse frequencies.
The maximum continuous motor current will be reduced if pulse frequencies > 4kHz are
selected on 380-480V units. The required derating is shown in the table below.
Maximum continuous motor current (A) for 380-480V units
Inverter
Power
0.37
0.55
0.75
1.1
1.5
2.2
3
4
5.5
7.5
11
MICROMASTER 420 Operating Instructions
6SE6400-5AA00-0BP0
Parameter Name
Slip compensation disabled
This uses the motor data and motor model such that rated
slip frequency is added at Motor speed rating and current.
4 kHz 6 kHz 8 kHz
1.2 1.2 1.2
1.6 1.6 1.6
2.1 2.1 2.1
3.0 3.0 2.7
4.0 4.0 2.7
5.9 5.9 5.1
7.7 7.7 5.1
10.2 10.2 6.7
13.2 13.2 13.2
18.4 18.4 13.2
26.0 26.0 17.9
10 kHz 12 kHz 14 kHz
1.2 1.2 1.2
1.6 1.6 1.6
2.1 1.6 1.6
2.7 1.6 1.6
2.7 1.6 1.6
5.1 3.6 3.6
5.1 3.6 3.6
6.7 4.8 4.8
13.2 9.6 9.6
13.2 9.6 9.6
17.9 13.5 13.5
International English
♦ ♦ ♦ ♦ P0003 User
Min
Access Level
Max
♦ ♦ ♦ ♦ P0004 Setting
[Default]
♦ ♦ ♦ ♦ Changeable
Units
♦ ♦ ♦ ♦ Status
0
600
[0]
%
0
600
[250]
%
2
16
[4]
kHz
16 kHz
1.1
1.1
1.1
1.1
1.1
2.6
2.6
3.6
7.5
7.5
10.4
2
13
'•'
2
13
'•'
2
2
'•'
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