Siemens MICROMASTER 420 0.25 kW 1-phase frequency inverter, 230 Vac to , 6SE6420-2AB12-5AA1 6SE6420-2AB12-5AA1 Hoja De Datos

MICROMASTER 420 Operating Instructions

89

6SE6400-5AA00-0BP0

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♦P0003 User

   Access Level
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♦P0004 Setting

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♦Changeable

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♦Status

Allows the User to select the PI feedback signal Transducer type.

0: = [default] if the feedback signal is less than the PI setpoint the PI controller will

increase motor speed to correct this

1: = if the feedback signal is less than the PI setpoint the PI controller will reduce motor

speed to correct this

It is very important that the transducer type is correctly selected.  If you are unsure that it
should be either 0 or 1 you can determine the actual type as follows:

Disable the PI function (P2200 = 0).  Increase the motor frequency while measuring the
feedback signal.  If the feedback signal increases with an increase in motor frequency the
transducer type should be 0.

If the signal decreases with an increase in motor frequency the transducer type should be
set to 1.

0
1

[0]

-

2

22

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•’

-
-

[-]
%

2

22

Displays the PI error (difference) signal between the setpoint and feedback signals in
percent.

-
-

[-]
%

2

22

Allows the User to set the proportional gain of the PI controller.

The PI controller on MM420 is implemented using the standard model:

output

error

+

+

Best results are usually obtained if both P and I terms are enabled.  If the system is liable
to sudden step changes in feedback signal, the P term should usually be set to a small
value (L 0.5) with a faster I term for optimum performance.

If the P term is set to 0 the I term acts on the square of the error signal.

0

125

[3]

-

2

22

‘

•’

Allows the User to set the PI controller integral time constant.

Refer to P2280 above for detail.

0

100

[0]

s

2

22

‘

•’