VLT
®
FCD Series
Programming, FCD
300
parameter 323
Relay output 1-3
or 341
Digital output,
terminal 46
(optionally also terminal 122 and 123).
Description of choice:
Set the required frequency.
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
(Optionally also 122 and 123).
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.
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.
NB!:
If the value in par. 144 is increased, the
motor current will simultaneously increase
significantly when generator loads are applied.
The parameter should therefore only be changed if
it is guaranteed during measurement that the motor
current in all operating situations will never exceed the
maximum permitted current in the motor.
Please note
:
that the current cannot be read out from the display.
146 Reset voltage vector
(RESET VECTOR)
Value:
*Off (OFF)
[0]
Reset (RESET)
[1]
Function:
When the voltage vector is reset it is set to the same
starting point each time a new process commences.
Description of choice:
Select reset (1) when running unique processes each
time they arise. This will enable repetitive precision
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.04.B7.02 - VLT is a registered Danfoss trademark
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