Danfoss iC7 Series Application Manual page 106

Application Guide | iC7 Series Industry
Data Type: UINT
The following are the selections for the parameter.
Selection Number Selection Name
0 Off
1 Enable brake chopper test run
P 3.3.2 Brake Resistor Resistance
Set the resistance value of the brake resistor.
Default Value: 5
Parameter 2936
Number:
Data Type: REAL
P 3.3.3 Brake Resistor Power Limit
Set the power limit for resistor braking.
Default Value: 1
Parameter 2937
Number:
Data Type:
REAL
The parameter must be configured to set the expected average power dissipated in the brake resistor over a period of 120 s. To calculate
the brake resistor power limit, use the following formula.
U 2 ×t (s)
br br
P (W)=
br, avg
R (Ω)×T (s)
br br
The following elements are used in 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 120 s. (T
l
br
U is the DC link when the brake chopper is active. The correct value depends on the selection of parameter 2.2.1 Unit Voltage Class
l
br
using the following table.
Table 34: Power rating and voltage class setting
Voltage range
Low voltage range
Medium voltage range
106 | © 2024.05
Access Type:
Selection Description
Executes a test of the brake chopper and brake resistor to check if
they are operational.
Parameter Type:
Unit:
Access Type:
Parameter Type:
Unit:
Access Type:
).
br
Parameter Descriptions
Read/Conditional Write
Range (\* — \*)
Ω
Read/Conditional Write
Range (0 — \*)
kW
Read/Write
Unit voltage class 380–500 V AC (3N05)
705
770
AB480436531518en-000601 / 136R0283