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[30] Ext. Closed Loop 1

[31] Ext. Closed Loop 2

[32] Ext. Closed Loop 3

F-10 Electronic Overload

Option: Function:

The frequency converter determines the motor temperature for motor protection in two different ways:

• Via a thermistor sensor connected to one of the analog or digital inputs (par. F-12 Motor Ther-

mistor Input).

• Via calculation of the thermal load, based on the actual load and time. The calculated thermal

load is compared with the rated motor current I

M,N

and the rated motor frequency f

M,N

. The

calculations estimate the need for a lower load at lower speed due to less cooling from the fan

incorporated in the motor.

[0] No protection If the motor is continuously overloaded and no warning or trip of frequency converter is wanted.

[1] Thermistor warning Activates a warning when the connected thermistor in the motor reacts in the event of motor over-

temperature.

[2] Thermistor trip Stops (trips) the frequency converter when the connected thermistor in the motor reacts in the event of

motor over-temperature.

[3] Elec. OL Warning 1

[4] * Elec. OL Trip 1

[5] Elec. OL Warning 2

[6] Elec. OL Trip 2

[7] Elec. OL Warning 3

[8] Elec. OL Trip 3

[9] Elec. OL Warning 4

[10] Elec. OL Trip 4

Electronic Overload functions 1-4 will calculate the load when set-up where they were selected is active. For example Elec. OL Warning 3 or Trip 3 starts calculating

when set-up 3 is selected. For the North American market: The Electronic Overload functions provide class 20 motor overload protection in accordance with NEC.

AF-600 FP High Power Operating Instructions

110