Danfoss VLT AutomationDrive FC 300 Programming Guide

3.4.3 2-1* Brake Energy Funct.
Parameter group for selecting dynamic braking parameters. Only valid for drives with brake chopper.
2-10 Brake Function
Option: Function:
[0] * Off No brake resistor is installed.
[1] Resistor brake A brake resistor is incorporated in the system, for dissipation of surplus brake energy as heat. Con-
necting a brake resistor allows a higher DC link voltage during braking (generating operation). The
Resistor brake function is only active in frequency converters with an integral dynamic brake.
[2] AC brake Is selected to improve braking without using a brake resistor. This parameter controls an overmag-
netization of the motor when running with a generatoric load. This function can improve the OVC-
function. Increasing the electrical losses in the motor allows the OVC function to increase the braking
torque without exceeding the over voltage limit. Please note that AC brake is not as effective as
dynamic breaking with resistor.
AC brake is for VVC
+
and flux mode in both open and closed loop.
2-11 Brake Resistor (ohm)
Range: Function:
Application
dependent*
[Application dependant] Set the brake resistor value in Ohms. This value is used for monitoring the power to the brake
resistor in par. 2-13
Brake Power Monitoring . This parameter is only active in frequency converters
with an integral dynamic brake.
Use this parameter for values without decimals. For a selection with two decimals, use
par. 30-81
Brake Resistor (ohm) .
2-12 Brake Power Limit (kW)
Range: Function:
Application
dependent*
[Application dependant] Set the monitoring limit of the brake power transmitted to the resistor.
The monitoring limit is a product of the maximum duty cycle (120 sec.) and the maximum power
of the brake resistor at that duty cycle. See the formula below.
For 200 - 240 V units:
P
resistor
=
390
2
× dutytime
R
× 120
[W]
For 380 - 480 V units
P
resistor
=
778
2
× dutytime
R
× 120
[W]
For 380 - 500 V units
P
resistor
=
810
2
× dutytime
R
× 120
[W]
For 575 - 600 V units
P
resistor
=
943
2
× dutytime
R
× 120
[W]
This parameter is only active in frequency converters with an integral dynamic brake.
2-13 Brake Power Monitoring
Option: Function:
This parameter is only active in frequency converters with an integral dynamic brake.
This parameter enables monitoring of the power to the brake resistor. The power is calculated on
the basis of the resistance (par. 2-11
Brake Resistor (ohm) ), the DC link voltage, and the resistor
duty time.
[0] * Off No brake power monitoring required.
[1] Warning Activates a warning on the display when the power transmitted over 120 s exceeds 100% of the
monitoring limit (par. 2-12
Brake Power Limit (kW) ).
The warning disappears when the transmitted power falls below 80% of the monitoring limit.
3 Parameter descriptions FC 300 Programming Guide
66 MG.33.M8.02 - VLT
®
is a registered Danfoss trademark
3

Danfoss VLT AutomationDrive FC 300 Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 300
Category	DC Drives
Language	English