Danfoss iC2 User Manual

Parameter
number:
214 Unit: V
Data type: uint16 Access type: Read/Write
7.4.3 Brake Resistor (Menu Index 3.3)
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 type: Range (Size Related)
Parameter
number:
211 Unit: Ω
Data type: uint16 Access type: Read/Write
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 type: Range (0.001–2000)
Parameter
number:
212 Unit: kW
Data type: uint32 Access type: Read/Write
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:
l P
br, avg
is the average power dissipated in the brake resistor.
l R
br
is the resistance of the brake resistor.
l t
br
is the active breaking time within the 120 s period T
br
.
l U
br
is the DC voltage where the brake resistor is active.
For T4 units, the DC voltage is 770 V, which can be reduced by P 3.2.2 Brake Chopper Voltage Reduce .
 NOTICE
If R
br
is not known or if T
br
is different from 120 s, the practical approach is to run the brake application, readout P 3.1.1 Brake
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 | Danfoss A/S © 2024.03 AB413939445838en-000301 / 130R1254
Application Guide | iC2-Micro Frequency Converters

Danfoss iC2 Specifications

General

Brand	Danfoss
Model	iC2
Category	Media Converter
Language	English