Time Dependent Overload Curve - KEB COMBIVERT F5 Reference Manual

2.9 Time dependent overload curve

If the load current exceeds the rated current but is below the overcurrent level, an overload
timer begins counting. The rate at which the timer increments is a function of load current.
The higher the current, the faster the increments. When the counter reaches the limit, the
Error Overload (E.OL) fault is triggered and the output to the motor is shut off. At this point,
the inverter begins a cool-down period where the inverter is allowed to cool before the fault
can be reset. When the drive displays a No Error Overload (E.nOL) message, the inverter
has reached an acceptable temperature level and can be restarted.
 Less than size 24
Time [s]
300
270
240
210
180
150
120
90
60
30
0 105 110 115 120 125 130 135 140 145 150 160 170 180 190 200
 Size 24 and greater
Time [s]
300
270
240
210
180
150
120
90
60
30
0 105 110 115 120 125 130 135 140 145 150
Overload Curves
The overload curves are
dependent on the inverter
housing size.
Load [%]
Load [%]
39