2-04 DC-Brake Cut-in Speed
Range: Function:
0.0 Hz
*
[0.0 - 400.0 Hz] Set DC-brake cut-in speed to activate DC braking current, set in
par. 2-01, when ramping down.
When set to 0 the function is off.
4.3.3. 2-1* Brake Energy Function
Use the parameters in this group for selecting dynamic braking parameters.
2-10 Brake Function
Option: Function:
Resistor Brake:
The resistor brake limits voltage in the intermediate circuit when
the motor acts as generator. Without brake resistor, the fre-
quency converter eventually trips.
The resistor brake consumes surplus energy resulting from mo-
tor braking. A frequency converter with brake stops a motor
faster than without a brake, which is used in many applications.
Requires connection of external brake resistor.
An alternative to the resistor brake is the AC brake.
NB!
Resistor brake is only functional in frequency con-
verters with integrated dynamic brake. An exter-
nal resistor must be connected.
AC Brake:
The AC brake consumes surplus energy by creating power loss
in the motor.
It is important to keep in mind that an increase in power loss
causes motor temperature to rise.
[0]
*
Off No brake function.
[1] Resistor Brake Resistor brake is active.
[2] AC Brake AC brake is active.
2-11 Brake Resistor (Ohm)
Range: Function:
5 Ω
*
[5 - 5000 Ω] Set brake resistor value.
2-16 AC Brake, Max Current
Range: Function:
100.0 %
*
[0.0 - 150.0 %] Enter max. permissible current for AC-braking to avoid over-
heating of motor.
100% equals motor current set in par. 1-24.
4. Parameter Descriptions VLT Micro Drive FC 51
28
MG.02.C2.02 - VLT
®
is a registered Danfoss trademark
4
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