Danfoss VLT AutomationDrive FC 301 User Manual

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:
50. Ohm* [5. - 32000. Ohm]
2-12 Brake Power Limit (kW)
Range: Function:
5.000 kW* [0.001 - 500.000 kW]
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.
[2] Trip Trips frequency converter and displays an alarm when the calculated power exceeds 100% of the
monitoring limit.
[3] Warning and trip Activates both of the above, including warning, trip and alarm.
If power monitoring is set to
Off [0] or Warning [1], 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 outputs. The measuring accuracy of the power monitoring depends
on the accuracy of the resistance of the resistor (better than ± 20%).
2-15 Brake Check
Option: Function:
Select type of test and monitoring function to check the connection to the brake resistor, or whether
a brake resistor is present, and then display a warning or an alarm in the event of a fault.
4 How to Programme
VLT
®
AutomationDrive FC 300 Operating
Instructions
52 MG.33.AG.02 - VLT
®
is a registered Danfoss trademark
4

Danfoss VLT AutomationDrive FC 301 Specifications

General

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