Lenze 8400 Manuel d'utilisateur télécharger pdf (Page 253)

Braking operation

Braking o peration with external brake resistor

Selection of the brake resistors



253

EDS84ASC552 EN 9.1

8.2.4 Selection of the brake resistors

The recommended Lenze brake resistors are adapted to the corresponding controller (with

regard to 150 % of regenerative power). They are suitable for most of the applications.

For special applications, e.g. centrifuges, the brake resistor must meet the following

criteria:

Brake resistor Application

Criterion With active load With passive load

Continuous braking power

[W]

≥ P

max

⋅ η

⋅

zykl

≥

max

⋅ η

⋅

zykl

Heat quantity [Ws]

≥ P

max

⋅ η

⋅ t

≥

max

⋅ η

⋅ t

Resistance []

min

≤ R ≤

max

⋅ η

Active load Can start to move independent of the drive

(e.g. unwinder)

Passive load Can stop independent of the drive

(e.g. horizontal travelling drives, centrifuges, fans)

[V] Brake chopper switching threshold from C0174

max

[W] Maximum occurring braking power determined by the application



Electrical efficiency (controller + motor)

Guide value: 0.54 (0.25 kW) ... 0.85 (11 kW)



Mechanical efficiency (gearbox, machine)

[s] Braking time

cycl

[s] Cycle time = t ime between two successive braking processes (= t

+deadtime)

min

[] Minimum permissible brake resistance (see rated data of the integrated brake chopper)

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Lenze 8400 Manuel d'utilisateur Page 253

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