Lenze E82EV752K4C User Manual

Limit value setting
Current limits
10
Function library
10.6
10.6.2
L
10.6-3
EDS82EV903-1.0-11/2002
10.6.2 Current limits
The controllers are equipped with a current-limit control which determines the
dynamic response under load. The measured load is compared with the limit
values set underC0022 for motorload and C0023 for generatorload. If thecurrent
limit is exceeded, the controller will change its dynamic behaviour:
Motor overload during acceleration:
The controller prolongs the acceleration ramp.
Generator overload during deceleration:
The controller prolongs the deceleration ramp.
With increasing load and constant speed:
l When the current limit of the motor mode is reached:
– The controller reduces the output frequency to 0 Hz.
– The controller cancels the change of the output frequency if the load falls
below the limit value.
l When the current limit in the generator mode is reached:
– The controller increases the output frequency up to the maximum
frequency (C0011).
– The controller cancels the change of the output frequency if the load falls
below the limit value.
l If suddenly a load is applied to the motor shaft (e.g. drive is blocked), the
overcurrent switch-off can be activated (error message OCX).
Codes for parameter setting
Code Possible settings IMPORTANT
No. Name Lenze Selection
C0022 I
max
limit (motor
mode)
150 30 {1 %} 150 Only 8200 vector 15 ... 90 kW:
If C0022 = 150 %, 180 % I
r
are available
for max. 3 s. after controller enable
^ 10.6-3
C0023 I
max
-limit in the
generator mode
150 30 {1 %} 150 C0023 = 30 %: function is inactive, if
C0014 = 2, 3:
^ 10.6-3
l Set the acceleration and deceleration times so that the drive can follow the
speed profile without reaching I
max
of the controller.
l C0022 and C0023 refer to the rated output current at a chopper frequency
of 8 kHz.
l When operating with a chopper frequency of 16 kHz you must adapt C0022
and C0023 to the permissible output currents (derating).
l Correct current control for operation in generator mode is only possible with
external brake resistor.
Description
Controller performance when a
limit value is reached
Adjustment
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Lenze E82EV752K4C Specifications

General

Brand	Lenze
Model	E82EV752K4C
Category	DC Drives
Language	English