ADL300 • Functions description and parameters list 87
When the current motor speed is below (PAR 2004 Rated speed / 2) and PAR 3216 Motor fan type = Auto fan, the protec-
tion intervention time must be reduced as cooling is insucient.
At below (PAR 2004 Rated speed / 2) sthe protection intervention time is reduced by reducing the direct current of the
MOTOR OVERLOAD function.
When the motor speed is equal to (PAR 2004 Rated speed / 2) ) the direct current of the MOTOR OVERLOAD function
is equal to PAR 2002 Rated current * PAR 3206 Motor service factor, whereas below that limit it is modied following a
linear pattern until PAR 2002 Rated current * PAR 3206 Motor service factor * PAR 3218 Motor derat factor when the
motor speed reaches zero.
The overload current of the MOTOR OVERLOAD function is obtained by PAR 2002 Rated current * PAR 3206 Motor
service factor * PAR 3202 Motor ovld factor and is the maximum current that can circulate in the motor. If the MOTOR
OVERLOAD function is enabled the drive automatically sets the torque current limit so that Iout max. does not exceed this
value.
With the MOTOR OVERLOAD function a current equal to the Overload level is supplied to the motor for the maximum time
set in PAR 3204 Motor ovld time, The slower the motor speed, the shorter the time allowed (see graphs).
After the set time, the MOTOR OVERLOAD function automatically sets the torque current limit so that Iout max. does not
exceed the direct current of the MOTOR OVERLOAD function.
When the motor current speed exceeds (PAR 2004 Rated speed / 2) and PAR 3216 Motor fan type = Auto fan, the direct
current is not reduced as cooling is sucient.
When PAR 3216 Motor fan type = Servo fan, the direct current is not reduced as cooling is sucient.
If the value of parameter 3202 Motor ovld factor is 100 % the overload current of the Motor Overload function is equal
to the continuous current of the Motor Overload function. In this case the drive behaves as if the overload cycle has been
executed and so sets the torque current limit so that Iout max is not more than the continuous current, i.e. Rated current
(PAR 2002) * Motor service factor (PAR 3206) * Motor derat factor (PAR 3218).
We recommend setting parameter 3218 Motor derat factor to a value so that Rated current (PAR 2002) * Motor service
factor (PAR 3206) * Motor derat factor (PAR 3218) produces a result that is more than the motor magnetisation current.
20.4 - FUNCTIONS/BRES OVERLOAD
Menu PAR Description UM Type FB BIT Def Min Max Acc Mod
20.4.1 3250 Bres control BIT 1 0 1 ERWZ FVS
Enabling of the external braking resistance and relative overload control.
Menu PAR Description UM Type FB BIT Def Min Max Acc Mod
20.4.2 3252 Bres value ohm FLOAT SIZE 7.0 1000.0 ERWS FVS
Setting of the ohm value of the external braking resistor
Menu PAR Description UM Type FB BIT Def Min Max Acc Mod
20.4.3 3254 Bres cont power kW FLOAT SIZE 0.1 100.0 ERWS FVS
Setting of the power that can be continuously dissipated by the external braking resistor.
Menu PAR Description UM Type FB BIT Def Min Max Acc Mod
20.4.4 3256 Bres overload factor FLOAT SIZE 1.5 10.0 ERWS FVS
Setting of the external resistor overload factor.
Menu PAR Description UM Type FB BIT Def Min Max Acc Mod
20.4.5 3258 Bres overload time s FLOAT SIZE 0.5 50.0 ERWS FVS
Setting of the intervention time of the external braking resistor overload.
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