Mechanical Brake - Danfoss VLT AutomationDrive FC 360 Programming Manual

Parameter Descriptions
2-12 Brake Power Limit (kW)
Range: Function:
Size [0.001 2-12 Brake Power Limit (kW) is the expected
related - 2000 average power dissipated in the brake
*
kW] resistor over a period of 120 s. It is used as
the monitoring limit for 16-33 Brake
Energy /2 min and thereby specifies when a
warning/alarm is to be given.
To calculate 2-12 Brake Power Limit (kW), the
following formula can be used.
P br,avg W =
P is the average power dissipated in the
br,avg
brake resistor, R
brake resistor. t
within the 120 s period, T
U is the DC voltage where the brake
br
resistor is active. This depends on the unit
as follows:
T4 units: 778 V
NOTICE
If R is not known or if T
br
from 120 s, the practical approach is
to run the brake application, readout
16-33 Brake Energy /2 min and then
enter this + 20% in 2-12 Brake Power
Limit (kW).
2-14 Brake Voltage Reduce
Range:
0 V [ 0-68 V, depending on power size]
*
2-16 AC Brake, Max current
Range: Function:
100 % [0 - 160 Enter the maximum permissible current
*
%] when using AC brake to avoid overheating
of motor windings.
NOTICE
Parameter 2-16 AC Brake, Max current
has no effect when 1-10 Motor
Construction is set to [1] PM, non-
salient SPM.
2-17 Over-voltage Control
Option: Function:
Overvoltage control (OVC) reduces the risk of
the frequency converter tripping due to an
overvoltage on the DC link caused by
generative power from the load.
[0] Disabled No OVC required.
*
MG06C402
Programming Guide
U br 2 V × t br s
R br Ω × T br s
is the resistance of the
br
is the active breaking time
br
.
br
is different
br
Function:
Danfoss A/S © Rev. 2014-03-31 All rights reserved.
2-17 Over-voltage Control
Option: Function:
[1] Enabled Activates OVC except when using a stop signal
(not at to stop the frequency converter.
stop)
[2] Enabled Activates OVC
WARNING
Do NOT be enable OVC in hoisting
applications.
2-19 Over-voltage Gain
Range:
100 % [0 - 200 %]
*

4.3.3 2-2* Mechanical Brake

2-20 Release Brake Current
Range: Function:
0 A [0 - Set the motor current for release of the
*
100 A] mechanical brake, when a start condition is
present. The default value is the maximum
current the inverter can provide for the particular
power size. The upper limit is specified in
16-37 Inv. Max. Current.
NOTICE
When mechanical brake control output is
selected but no mechanical brake is
connected, the function does not work by
default setting due to too low motor
current.
2-22 Activate Brake Speed [Hz]
Range: Function:
0 Hz [0 - 400 Hz] Set the motor frequency for activation of
*
the mechanical brake when a stop
condition is present.
Function:
Select overvoltage gain.
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