NORDAC BASE (SK 180E / SK 190E) – Users Manual for Frequency Inverters
148
BU 0180 en-4118
P555
Chopper P limitation
(Chopper power limitation)
S
5 ... 100 %
{ 100 }
With this parameter it is possible to program a manual (peak) power limit for the brake resistor.
The switch-on delay (modulation level) for the chopper can only rise to a certain maximum
specified limit. Once this value has been reached, irrespective of the level of the link voltage, the
inverter switches off the current to the resistor.
The result would be an overvoltage switch-off of the FI.
The correct percentage value is calculated as follows:
%
100
*
*
[%]
2
max
max
U
P
R
k
BW
=
R = Resistance of the brake resistor
P
maxBW
= Momentary peak power of the brake resistor
U
max
= FI chopper switching threshold
1~ 115/230 V
⇒
440 V=
3~ 230 V
⇒
440 V=
3~ 400 V
⇒
840 V=
NOTE:
This parameter is
only
relevant for
size 2
.
P556
Braking resistor
(Brake resistor)
S
20 ... 400
Ω
{ 120 }
Value of the brake resistance for the calculation of the maximum brake power to protect the
resistor.
Once the maximum continuous output (
P557
) including overload (200 % for 60 s) is reached, an
I
2
t limit error (
E003.1
) is triggered. Further details in (
P737
).
NOTE:
This parameter is
only
relevant for
size 2
.
P557
Brake resistor type
(Brake resistor power)
S
0.00 ... 20.00 kW
{ 0.00 }
Continuous power (nominal power) of the resistor, to display the actual utilisation in (
P737
). For a
correctly calculated value, the correct value must be entered into (
P556
) and (
P557
).
0.00 =
Monitoring disabled
NOTE:
This parameter is
only
relevant for
size 2
.
P558
Flux delay
(
Flux delay
)
S
P
0 / 1 / 2 ... 500 ms
{ 1 }
The ISD control can only function correctly if there is a magnetic field in the motor. For this
reason, a DC current is applied before starting the motor to provide the excitation of the stator
winding. The duration depends on the size of the motor and is automatically set in the factory
setting of the FI.
For time-critical applications, the magnetizing time can be set or deactivated.
0 =
Disabled
1 =
Automatic calculation
2 ... 500 =
Time set in [ms]
NOTE:
Setting values that are too low can reduce the dynamics and starting torque.
Summary of Contents for SK 180E Series
Page 1: ...BU 0180 en NORDAC BASE SK 180E SK 190E Users Manual for Frequency Inverters...
Page 4: ...NORDAC BASE SK 180E SK 190E Users Manual for Frequency Inverters 4 BU 0180 en 4118...
Page 185: ...8 Additional information BU 0180 en 4118 185 8 3 4 EU Declaration of Conformity...
Page 211: ...Key word index BU 0180 en 4118 211...
Page 212: ...6071802 4118...
