Danfoss VLT Midi Drive FC-280P4K0 [44/136] Warning

Danfoss VLT Midi Drive FC-280P4K0 [44/136] Warning
2-12 Brake Power Limit (kW)
Range: Function:
P
br,avg
is the average power dissipated in
the brake resistor. R
br
is the resistance of
the brake resistor. t
br
is the active breaking
time within the 120 s period T
br
.
U
br
is the DC voltage where the brake
resistor is active. For T4 units, the DC
voltage is 770 V, which can be reduced by
parameter 2-14 Brake voltage reduce.
NOTICE
If R
br
is not known or if T
br
is dierent
from 120 s, the practical approach is
to run the brake application, read out
parameter 16-33 Brake Energy Average,
and then enter this value + 20% in
parameter 2-12 Brake Power Limit
(kW).
2-14 Brake voltage reduce
Range: Function:
0 V* [ 0 - 70 V] Setting this parameter may change the brake
resistor (parameter 2-11 Brake Resistor (ohm)).
2-16 AC Brake, Max current
Range: Function:
100 %* [0 -
160 %]
Enter the maximum allowed current when
using AC brake to avoid overheating of
motor windings.
NOTICE
Parameter 2-16 AC Brake, Max current
is not available for all PM motors, for
example, all of the PM choices in
parameter 1-10 Motor Construction.
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.
[1] Enabled
(not at
stop)
Activates OVC except when using a stop signal
to stop the frequency converter.
[2] Enabled Activates OVC.
2-17 Over-voltage Control
Option: Function:
WARNING
PERSONAL INJURY AND EQUIPMENT
DAMAGE
Enabling OVC in hoisting applications
may lead to personal injuries and
equipment damage. Do not enable OVC
in such applications.
2-19 Over-voltage Gain
Range: Function:
100 %* [0 - 200 %] Select overvoltage gain.
2-20 Release Brake Current
Range: Function:
0 A* [0 - 100
A]
Set the motor current for release of the
mechanical brake when a start condition is
present. The upper limit is specied in
parameter 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.
2-23 Activate Brake Delay
Range: Function:
0 s* [0 - 5 s] Enter the brake delay time of the coast after
ramp-down time. The shaft is held at zero speed
with full holding torque. Ensure that the
mechanical brake has locked the load before the
motor enters coast mode.
Parameter Descriptions
VLT
®
Midi Drive FC 280
42 Danfoss A/S © 03/2016 All rights reserved. MG07C202
44

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