Danfoss VLT AutomationDrive FC 301 Programming Guide

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Parameter 2-12 Brake Power Limit (kW)
Table 160: Parameter 2-12 Brake Power Limit (kW)
2-12 Brake Power Limit (kW)
Default value: Size related
Parameter type: Range, 0.001 - 2000.000 kW
Setup: All setups
Conversion index: 0
Data type: Uint32
Change during operation: True
Parameter 2-12 Brake Power Limit (kW) is the expected average power dissipated in the brake resistor over a period of 120 s. It is used
as the monitoring limit for parameter 16-33 Brake Energy Average and thereby specifies when a warning/alarm is to be given. To
calculate parameter 2-12 Brake Power Limit (kW), the following formula can be used.
Pbr, avg W =
U
2
br V  × tbr s
Rbr Ω  × Tbr s
P
br,avg
is the average power dissipated in the brake resistor. R
br
is the resistance of the brake resistor. t
br
is the active braking time
within the 120 s period, T
br
. U
br
is the DC voltage where the brake resistor is active. This depends on the unit as follows:
T2 units: 390 V
T4 units: 810 V
T5 units: 810 V
T6 units: 943 V/1099 V for D–F enclosures
T7 units: 1099 V
N O T I C E
If R
br
is not known, or if T
br
is different from 120 s, the practical approach is to run the brake application, read parameter 16-33
Brake Energy Average and then enter this + 20% in parameter 2-12 Brake Power Limit (kW).
Parameter 2-13 Brake Power Monitoring
Table 161: Parameter 2-13 Brake Power Monitoring
2-13 Brake Power Monitoring
Default value: [0] Off
Parameter type: Option
Setup: All setups
Conversion index: –
Data type: Uint8
Change during operation: True
This parameter is only active in drives with a brake. This parameter enables monitoring of the power to the brake resistor. The pow-
er is calculated based on the resistance (parameter 2-11 Brake Resistor (ohm)), the DC-link voltage, and the resistor duty time. If pow-
er monitoring is set to [0] Off or [1] Warning, the brake function remains active, even if the monitoring limit is exceeded. This may
lead to thermal overload of the resistor. It is also possible to generate a warning via a relay/digital output. The measuring accuracy
of the power monitoring depends on the accuracy of the resistance of the resistor (better than ±20%).
Option
Name
Description
[0]*
Off
No brake power monitoring required.
[1]
Warning 120s
Activates a warning on the display when the power transmitted during the duty time exceeds
100% of the monitoring limit (parameter 2-12 Brake Power Limit (kW)). The warning disappears
when the transmitted power drops below 80% of the monitoring limit.
[2]
Trip 120s
Trips the drive and shows an alarm when the calculated power exceeds 100% of the monitoring
limit.
[3]
Warning & Trip 120s
Activates both of the above, including warning, trip, and alarm.
[4]
Warning 30s
[5]
Trip 30s
AU275636650261en-000101 / 130R0334 | 115Danfoss A/S © 2022.12
Parameter Descriptions
VLT AutomationDrive FC 301/302
Programming Guide

Danfoss VLT AutomationDrive FC 301 Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 301
Category	DC Drives
Language	English