52 ESP program features
Underload and overload protection
Load protection functions can constantly monitor selected load signal against defined
limit which are fixed along the motor speed range or vary according to the load curve
settings.
Each underload and overload protection function limit type can be configured
separately for the user defined any kind of work-zone in terms of load conditions.
The custom user load curve provides a function that monitors an input signal (eg.
Motor torque or motor current) as a function of drive output speed or frequency. The
function includes both high limit (overload) and low limit (underload) monitoring.
Overload monitoring can, for example, be used to detect a pump becoming clogged
or a saw blade hitting a knot. Underload monitoring can detect the load being lost, for
example because of the snapping of a transmission belt.
The monitoring is effective within a motor speed and/or frequency range. The
frequency range is used with a frequency reference in scalar motor control mode;
otherwise, the speed range is used. The range is defined by five speed (parameters
...
) values. The values are positive, but the monitoring is symmetrically
active in the negative direction as the sign of the monitored signal is ignored. Outside
the speed/frequency range, the monitoring is disabled.
An underload (
) limit is set for each of the
five speed or frequency points. Between these points, the limits are interpolated
linearly to form overload and underload curves.
Monitored signal (
) (
(%)
(%)
(%)
OVERLOAD
UNDERLOAD
ALLOWED
OPERATION
(%)
Speed
Frequency
(%)
(%)
(%)
Содержание ACS880-01 Series
Страница 1: ...ABB industrial drives Firmware manual ACS880 ESP control program option N5600 ...
Страница 4: ......
Страница 12: ...12 Table of contents ...
Страница 20: ...20 Introduction to the manual ...
Страница 22: ...22 Using the control panel ...
Страница 28: ...28 Control locations and operating modes ...
Страница 145: ...Application macros 145 Fieldbus control macro This application macro is not supported by the current firmware version ...
Страница 146: ...146 Application macros ...
Страница 502: ...502 Parameters ...
Страница 606: ...606 Fault tracing ...
Страница 662: ...662 Control chain diagrams ...
Страница 664: ...Contact us www abb com drives www abb com drivespartners 3AXD50000041193 Rev A EN EFFECTIVE 2017 06 30 ...