Brake Resistor (Menu Index 3.3) - Danfoss iC2 Application Manual

Application Guide | iC2-Micro Frequency Converters
Parameter
214
number:
Data type:
uint16

Brake Resistor (Menu Index 3.3)

7.4.3
P 3.3.2 Brake Resistor Value
Set the brake resistor value in Ω. This value is used for monitoring the power to the brake resistor. P 3.3.2 Brake Resistor Value is only
active in frequency converters with an integral dynamic brake. Use this parameter for values without decimals.
Default value:
Size Related
Parameter
211
number:
Data type:
uint16
P 3.3.3 Brake Resistor Power Limit
Set the monitoring limit of the brake power transmitted to the resistor. This parameter is only active in drives with an integral dynamic
brake.
Default value:
Size Related
Parameter
212
number:
Data type:
uint32
To calculate the value of the P 3.3.3 Brake Power Limit, the following formula can be used.
The following are the elements of the formula:
P is the average power dissipated in the brake resistor.
l
br, avg
R is the resistance of the brake resistor.
l
br
t is the active breaking time within the 120 s period T
l
br
U is the DC voltage where the brake resistor is active.
l
br
For T4 units, the DC voltage is 770 V, which can be reduced by P 3.2.2 Brake Chopper Voltage Reduce .
If R is not known or if T
br br
Energy, and then enter this value + 20% in P 3.3.3 Brake Resistor Power Limit.
Selection of a low value reduces energy loss in the motor but can also reduce resistance to sudden load changes. The P 4.4.1.3 Torque
Characteristic must be set to AEO.
120
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is different from 120 s, the practical approach is to run the brake application, readout P 3.1.1 Brake
Unit:
Access type:
Parameter type:
Unit:
Access type:
Parameter type:
Unit:
Access type:
.
br
NOTICE
V
Read/Write
Range (Size Related)
Ω
Read/Write
Range (0.001–2000)
kW
Read/Write
AB413939445838en-000301 / 130R1254