Lenze 8400 protec Manual - Manual (Page 151)

Braking operation
Braking operation with external brake resistor
9
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151 EDS84DPS424 EN 5.0
9.2 Braking operation with external brake resistor
To decelerate greater moments of inertia or with a longer operation in generator mode an
external brake resistor is required. It converts braking energy into heat.
The brake resistor is connected if the DC−bus voltage exceeds the switching threshold. This
prevents the controller from setting pulse inhibit through the "Overvoltage" fault and the
drive from coasting. The external brake resistor serves to control the braking process at any
time.
The brake chopper integrated in the controller connects the external brake resistor.
ƒ Adapt the switching threshold to the mains voltage (C00173/C00714, see software
manual).
The rated data for the brake chopper are provided in the chapters 4.2.2 and 4.2.3.