Bosch PIN8 N1 Instrukcja Naprawy Pobierz pdf (Strona 228)

100

101

6-16 Drive Control MPH-02, MPB-02, MPD-02

DOK-INDRV*-MP*-02VRS**-FK01-EN-P

In addition, magnetization can be influenced via bit 2 of P-0-0045,

Control word of current controller:

• With bit 2 = 0 in P-0-0045 (default) magnetization is increased up to

the nominal value according to the required torque; 100% are

reached at nominal motor torque.

• With bit 2 = 1 in P-0-0045 magnetization remains at the value set in

P-0-0532 independent of the load.

The flux feedforward calculates the optimum rotor flux command value for

each working point of the machine. The limiting variable is the motor

voltage that increases with the speed. As limit value the flux feedforward

uses the value in parameter P-0-0535, Motor voltage at no load. The

motor voltage at no load is specified in a percentage-based way and also

refers to the maximum possible output voltage of the inverter.

Note: A setting of 80% in parameter P-0-0535 is advisable.

In addition, the following motor data have an influence on flux feedforward

and flux model:

• P-0-4004, Magnetizing current

• P-0-4039, Stator leakage inductance

• P-0-4040, Rotor leakage inductance

• P-0-4041, Motor magnetizing inductance

• P-0-4042, Characteristic of motor magnetizing inductance

• P-0-4043, Rotor time constant

On the basis of the above motor data and the active value of the flux-

generating current I

, the flux model calculates the actual value of the

rotor flux. This value is used as actual value for the flux loop (see below)

and additionally determines the torque constants and the behavior of the

slip frequency of the asynchronous machine required for generating the

torque.

The slip frequency changes with the temperature of the motor. This is

compensated by measuring the motor temperature (S-0-0383) and

evaluation with the factor in parameter

• P-0-0530, Slip increase.

This factor is to set depending on the motor cooling type.

The voltage loop works as a PI loop and in the absolute value limits the

voltage output by the current loop to a maximum value. The setting is

made via the following parameters:

• P-0-0533, Voltage loop proportional gain

• P-0-0534, Voltage loop integral action time

• P-0-0536, Maximum motor voltage

When the maximum motor voltage is exceeded, the output of the voltage

loop interferes in a corrective way in the output value of the flux feed

forward.

The maximum motor voltage is specified in a percentage-based way and

refers to the maximum possible output voltage of the inverter that is

determined by the active DC bus voltage (cf. S-0-0380).

Note: A setting of 90% in parameter P-0-0536 is advisable.

Flux Model

Voltage Loop

1 2 ... 223 224 225 226 227 228 229 230 231 232 233 ... 727 728

Komentarze do niniejszej Instrukcji

Brak uwag

Bosch PIN8 N1 Instrukcja Naprawy Strona 228

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Płyty grzewcze Bosch PIN8 N1