VLT
®
2800 Series
139 Brake cut in frequency
(BRAKE CUT IN)
Value:
0.5 - 132.0/1000.0 Hz
✭ 3.0 Hz
Function:
Here you can select the frequency at which the
external brake is activated; this takes place via
the output defined in parameter 323 Relay output
1-3 or 341 Digital output terminal 46.
Description of choice:
Set the required frequency.
140 Current, minimum value
(CURRENT MIN VAL)
Value:
0 % - 100 % of inverter output current
✭ 0%
Function:
This is where the user selects the minimum motor
current running for the mechanical brake to be
released. Current monitoring is only active from stop
until the point when the brake is released.
Description of choice:
This is an extra safety precaution, aimed at
guaranteeing that the load is not lost during start
of a lifting/lowering operation.
142 Leakage reactance X
L
(LEAK. REACTANCE)
Value:
0.000 - XXX,XXX
✭ Depends on choice of motor
X
L
is sum of rotor and stator leakage reactance.
Function:
After setting of parameters 102-106 Nameplate data,
a number of adjustments of various parameter is
made automatically, including the leakage reactance
X
L
. The shaft performance can be improved by
fine-tuning the leakage reactance X
L
.
NB!:
Parameter 142 The leakage reactance X
L
is
normally not to be changed if the nameplate
data have been set, parameters 102-106.
Description of choice:
X
L
can be set as follows:
1. The value is stated by the motor supplier.
2. Use the factory settings of X
L
which the
frequency converter itself chooses on the basis
of the motor nameplate data.
143 Internal fan control
(FAN CONTROL)
Value:
✭Automatic (AUTOMATIC)
[0]
Always switched on (ALWAYS ON)
[1]
Always switched off (ALWAYS OFF)
[2]
Function:
This parameter can be set so that the internal fan is
automatically switched on and off. You can also set
the internal fan to be permanently switched on or off.
Description of choice:
If Automatic [0] is selected, the internal fan is switched
on or off depending on the ambient temperature
and the loading of the frequency converter.
If Always switched on [1] Always switched
off [2] are selected, the internal fan will be
permanently switched on or off.
NB!:
If Always switched off [2] is selected in
combination with high switch frequency,
long motor cables or high output power, the
frequency converter’s life span is reduced.
144 Gain AC brake
(GAIN AC BRAKE)
Value:
1.00 - 1.50
✭ 1.30
Function:
This parameter is used to set the AC brake. Using par.
144 it is possible to adjust the size of the generator
torque that can be applied to the motor without the
intermediate circuit voltage exceeding the warning level.
Description of choice:
The value is increased if a greater possible brake
torque is required. If 1.0 is selected, this corresponds
to the AC brake being inactive.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.28.A9.02 - VLT is a registered Danfoss trademark
26
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