Danfoss VLT AutomationDrive FC 301 Operating Instructions Manual page 52

4 How to Programme
2-10 Brake Function
Option:
[0] * Off
[1] Resistor brake
[2] AC brake
4
2-11 Brake Resistor (ohm)
Range:
50. Ohm* [5. - 32000. Ohm]
2-12 Brake Power Limit (kW)
Range:
5.000 kW* [0.001 - 500.000 kW]
For 200 - 240 V units:
For 380 - 480 V units
For 380 - 500 V units
For 575 - 600 V units
This parameter is only active in frequency converters with an integral dynamic brake.
2-13 Brake Power Monitoring
Option:
[0] * Off
[1] Warning
[2] Trip
[3] Warning and trip
If power monitoring is set to
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:
52
Function:
No brake resistor is installed.
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.
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
Function:
Function:
390 2 ×
P resistor
=
R
× 120
778 2 ×
P resistor
=
R × 120
810 2 ×
P resistor =
R × 120
943 2 ×
P resistor
=
R
× 120
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
duty time.
No brake power monitoring required.
Activates a warning on the display when the power transmitted over 120 s exceeds 100% of the
monitoring limit (par. 2-12
The warning disappears when the transmitted power falls below 80% of the monitoring limit.
Trips frequency converter and displays an alarm when the calculated power exceeds 100% of the
monitoring limit.
Activates both of the above, including warning, trip and alarm.
Off Warning
[0] or [1], the brake function remains active, even if the monitoring limit is exceeded. This may lead to thermal
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.
MG.33.AG.02 - VLT
+
and flux mode in both open and closed loop.
dutytime
[W]
dutytime
[W]
dutytime
[W]
dutytime
[W]
Brake Resistor (ohm)
Brake Power Limit (kW)
®
is a registered Danfoss trademark
®
VLT AutomationDrive FC 300 Operating
), the DC link voltage, and the resistor
).
Instructions