2.4.2 2-1* Brake Energy Funct.
Parameter group for selecting dynamic braking parameters.
2-10 Brake Function
Option:
Function:
[0] *
Off
No brake resistor installed.
[1]
Resistor brake
Brake resistor incorporated in the system, for dissipation of surplus brake energy as heat. Connect-
ing 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
2-11 Brake Resistor (ohm)
Range:
Function:
Application
dependent*
[Application dependant]
2-12 Brake Power Limit (kW)
Range:
Function:
Application
dependent*
[Application dependant]
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 is 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 the 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 output. The measuring accuracy of the power monitoring depends on
the accuracy of the resistance of the resistor (better than
s
20%).
VLT
p
Automation VT Drive FC322
Programming Guide
2 Parameter Description
MG.20.W1.22 - VLT
p
is a registered Danfoss trademark
53
2
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