Vector Control
11-34
11
Description:
The response time of the droop function is adjusted using P0334, which defines the constant time applied to the
filter used in the torque current.
The DROOP value in rpm can be obtained by means of the following equations:
x 0.1
[rpm]
iqf x P0333 x P0295
P0401
DROOP
=
When n
ref
> Nrated, the equation above must be multiplied by a ratio-corrector factor; thus, the value of the
corrected DROOP is given by:
x DROOP
[rpm]
n
ref
P0402
DROOP_cor
=
Where:
n
ref
– total speed reference
iqf – torque current (iq) filtered according to the setting of P0334
P0333 – DROOP factor (%)
P0295 – HD rated current of the inverter
P0401 – motor rated current
P0402 – motor rated speed in rpm
The approximate calculation of the torque current (iq) is given by:
P0009 x
P0401
2
- P0410
2
P0295
iq
=
For the DROOP calculation purposes, the iqf value can be considered equal to the iq determined in the expression above.
The influence of the DROOP function in the determination of the speed may be checked in
.
NOTE!
The setting of the DROOP factor (P0333) depends on the dynamics of each application, and it should be
set during on-load operation/installation. An empirical method to define the value of P0333 would be:
1. Set P0333 to zero and keep P0334 in its factory setting value.
2. Start the system operation with load and monitor the output currents of the inverters.
3. Modify the value of P0333, setting it to negative values until the output current values of the
inverters are similar.
4. In case it is necessary that the DROOP response to the speed and load variation be slower, the
value of P0334 must be increased.
11.9 START-UP IN THE VECTOR MODES SENSORLESS AND WITH ENCODER
NOTE!
Read the whole CFW-11 user's manual before installing, powering or operating the inverter.
Sequence for installation, verification, powering and start-up:
a)
Install the inverter:
according to the chapter 3 – Installation and Connection of the CFW-11 user's manual,
wiring all the power and control connections.
b)
Prepare the inverter and apply power:
according to the section 5.1 - Prepare for Start-Up, of the CFW-11
user's manual.
Содержание CFW-11 Series
Страница 2: ......
Страница 54: ...2 4 2 General Information ...
Страница 58: ...About the CFW 11 3 3 4 ...
Страница 74: ...Inverter Model and Accessories Identification 5 14 6 ...
Страница 86: ...Inverter Model and Accessories Identification 6 12 6 ...
Страница 94: ...Available Control Types 8 2 8 ...
Страница 118: ...VVW Control 10 8 10 ...
Страница 182: ...Functions Common to All the Control Modes 12 26 12 ...
Страница 220: ...Dynamic Braking 14 4 14 ...