Lenze 9400 Manual de usuario descargar pdf (Pagina 533)

Lenze · Servo-Inverter 9400 HighLine · Reference manual · DMS 10.0 EN · 11/2013 · TD05/06 533

11 Basic drive functions

11.12 Brake control

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Application example:

A hoist drive is to be operated with different loads. Unfortunately we do not know when the load is

available, but the starting direction (lifting or lowering) is known.

• In a no-load condition, the hoist drive needs a torque of 10 Nm. For holding the maximum load

it needs a torque of 50 Nm.

• The change-over between lifting and lowering at start-up is done via the input

BRK_bStartingTorque2.

• To ensure the correct direction at start-up, the speed controller is loaded with the following

starting torques:

• This results in the following behaviour depending on load and direction:

Feedforward control with memorised torque

[11-39] Feedforward control with parameterised starting torque

Lifting Lowering

Starting torque: C02586

= 50 Nm C02587 = 10 Nm

Lifting Lowering

Behaviour at max. load: Optimum behaviour Start-up a bit fast, but correct direction

(non-critical).

Behaviour without load: Start-up a bit fast, but correct direction

(non-critical).

Optimum behaviour

 C02588

: Source of starting torque

•When C02588 = 1, the starting torque is

the setpoint which has been automatically

memorised during the last closing process

(falling below the speed threshold set in

C02581

).

1

0

1

0

C02588 = 1

S&H

CTRL

Speed controller



 Note!

The greater the threshold for the brake activation set in C02581, the greater the dynamic

portion (e. g. the speed-dependent friction torque) in the memorised torque.

For the specific case that the load is altered while the motor holding brake is closed, a

correction value for the torque feedforward control can be defined via the input

BRK_dnTorqueAdd_n that is added to the memorised torque.

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