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84 Program features
Settings and diagnostics
Parameters common to motor thermal protection and motor overload protection:
…
(page
).
Parameters specific to motor overload protection:
(page
(page
Thermal protection of motor cable
The control program contains a thermal protection function for the motor cable. This
function should be used, for example, when the nominal current of the drive exceeds
the current-carrying capacity of the motor cable.
The program calculates the temperature of the cable on the basis of the following
data:
• Measured output current (parameter
)
• Nominal continuous current rating of the cable, specified by
, and
• Thermal time constant of the cable, specified by
When the calculated temperature of the cable reaches 102% of the rated maximum,
a warning (
) is given. The drive trips on a fault (
) when 106% is reached.
Settings
(page
).
User load curve
The 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
) or frequency (
) 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 (
) and overload (
…
) 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.
Содержание ACS880-x04
Страница 1: ... ABB INDUSTRIAL DRIVES ACS880 primary control program Firmware manual ...
Страница 4: ......
Страница 18: ...18 Using the control panel ...
Страница 24: ...24 Control locations and operating modes ...
Страница 111: ...Application macros 111 Fieldbus control macro This application macro is not supported by the current firmware version ...
Страница 112: ...112 Application macros ...
Страница 496: ...496 Additional parameter data ...
Страница 544: ...544 Fault tracing ...
Страница 602: ...602 Control chain diagrams ...