Blocking Protection For The Motor - Lenze 4800 Manual

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7.7.4

Blocking protection for the motor

Purpose
The blocking protection avoids that the collector of the DC motor is overheated in
standstill.
Function
FIG 7-59
The blocking protection is activated if
( I
( n
( the blocking time set (C124) are exceeded.
C 1 2 3
B l o c k i n g c u r r e n t
I
A
n
a c t
Blocking protection function
> threshold in C123
Aact
< 1% ¼ n
(C087) and
act rated
Configuration
C 1 2 4
B l o c k i n g t i m e
T r i p d E r
4900Str086
48XX/49XXSHB0399
7-103