Lenze DDS Target 9300 Servo PLC V8.x Manuel d'utilisateur télécharger pdf (Page 70)

2.12 MCTRL_MotorControl (node number 131)

9300 Servo PLC

System blocks

2−64

9300 Servo PLC EN 5.1

2.12.12 Field weakening

Adjusting the field weakening range is not required if the motor type has been set under C0086. In

this case all necessary parameters are set automatically.

The motor is operated in the field weakening range if

 the output voltage of the controller exceeds the rated motor voltage set under C0090.

 the controller cannot increase the output voltage with increasing speed because of the mains

voltage / DC−bus voltage.

Under C0575 you can set a factor between 1 ... 8 to limit the maximum field weakening. "8" means

that the maximum field weakening is 8−fold.

Manual field weakening

The field can be weakened manually via MCTRL_nFldWeak_a.

 For maximum excitation MCTRL_nFldWeak_a must be actuated with +100 % (= 16384).

 If MCTRL_nFldWeak_a is not assigned (free), the field weakening is automatically +100 %.

Stop!

The available torque is reduced by the field weakening.

2.12.13 Switching frequency changeover

The following switching frequencies can be set for the inverter under C0018:

 8 kHz for power−optimised operation  maximum power output of the controller, but with

audible pulse operation.

 16 kHz for noise−optimised operation  inaudible pulse operation of the controller, but with

reduced power output (torque).

 Automatic changeover between power−optimised and noise−optimised operation.

Code LCD

Possible settings

Info

Lenze Selection

C0018 fchop

1 Switching frequency

0 16/8 kHz automatic changeover Optimum noise reduction with

automatic changeover to 8 kHz

1 8 kHz sine Power−optimised operation

2 16 kHz sine Noise−optimised operation

Automatic switching frequency changeover

You can use the automatic switching frequency changeover if you want to operate the drive in the

noise−optimised range but the torque available in this mode is not high enough for acceleration

processes.

Condition M = f(I) Function

M < M

r16

) Controller operates with 16 kHz (noise−optimised)

r16

) < M < M

) Controller switches to 8 kHz (power−optimised)

M > M

max8

) Controller operates with 8 kHz at its current limit

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 168 169

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Lenze DDS Target 9300 Servo PLC V8.x Manuel d'utilisateur Page 70

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