Function Applications
-519-
When the motor overload detection level reaches the set motor overload pre-warning coefficient, the
DO or fault relay outputs the motor overload pre-warning signal. The motor overload pre-warning
coefficient is the percentage of time during which the motor runs continuously without reporting an
overload fault.
For example, if the motor overload protection gain is set to 1.00 and the motor overload pre-warning
coefficient is set to 80%, when the motor running current reaches 145% of the rated motor current
and the motor runs at this level for 4.8 minutes (80% x 6), the DO terminal or fault relay outputs the
motor overload pre-warning signal.
The motor overload pre-warning function enables the AC drive to send a warning signal to the
control system through the DO before motor overload protection starts. The pre-warning coefficient
is used to determine how early to send the pre-warning signal before the motor overload protection
starts. The larger the value is, the later the pre-warning signal is sent. When the accumulative output
current of the AC drive is greater than the overload time (value Y of the motor overload protection
inverse time delay curve) multiplied by the motor overload pre-warning coefficient (F9-02), the multi-
functional DO terminal of the AC drive outputs a motor overload pre-warning signal. When F9-02 is
set to 100%, the motor overload pre-warning and motor overload protection are performed
simultaneously.
To Next Page
Loading...
Need help?
General