VLT
®
2800 Series
137 DC hold voltage
(DC HOLD VOLTAGE)
Value:
0 - 100% of max. DC hold voltage
✭
0%
Function:
This parameter is used to keep the motor
(holding torque) at start/stop.
Description of choice:
This parameter can only be used if a selection has
been made of
DC hold
in parameter 121
Start
function
or 122
Function at stop
. To be set as
a percentage value of the max. DC hold voltage,
which depends on the choice of motor.
138 Brake cut out value
(BRAKE CUT OUT)
Value:
0.5 - 132.0/1000.0 Hz
✭
3.0 Hz
Function:
Here you can select the frequency at which the external
brake is released, via the output defined in parameter
323
Relay output 1-3
or 341
Digital output, terminal 46
.
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
.
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]
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.28.E9.02 - VLT is a registered Danfoss trademark
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