Lenze EVS9332xS Manual de usuario descargar pdf (Pagina 171)

Function library

Function blocks

3.2.40 Mains failure control (MFAIL)

3−119

EDSVS9332S−EXT EN 2.0

Fine setting

Abschaltschwelle LU

Abschaltschwelle OU

Einschaltschwelle Bremseinheit

nsprechschwelle

CMP2-OUT

MFAIL-DC-SET

Fig. 3−104 Schematic with different brake torques

t = t1 Mains failure

t = t2 Zero speed with higher braking torque (short adjustment time)

t = t3 Drive reaches the LU switch−off threshold with lower brake torque (higher adjustment time)

without reaching speed 0

t > t3 Drive is no longer controlled (is braked by friction)

Repeat the following steps several times.

1. Obtaining a very low final speed before the controller reaches the undervoltage threshold LU:

– Increasing the proportional gain MFAIL V

(C0980).

– Decreasing the integral−action time MFAIL T

(C0981).

2. Avoid activation of the brake unit or the overvoltage threshold:

– Increasing the integral−action time MFAIL T

(C0981) until the characteristic in Fig. 3−103 is

almost reached.

– Reduce additionally the setpoint of the DC bus voltage at the input MFAIL−DC−SET (in the

example C0472/19), if necessary.

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Lenze EVS9332xS Manual de usuario Pagina 171