Powerdrive F300 Getting Started Guide 99
Issue Number: 5
Safety
information
Product
information
Mechanical
installation
Electrical
installation
Getting started
Basic parameters
(Menu 0)
Running the
motor
Optimization
NV Media Card
Operation
Further
information
UL listing
information
Table 8-2 Sample rates for various control tasks at each switching frequency
8.4 High speed operation
8.4.1 Field weakening (constant power) operation
(Open loop and RFC-A mode only)
The drive can be used to run an induction machine above synchronous speed into the constant
power region. The speed continues to increase and the available shaft torque reduces. The
characteristics below show the torque and output voltage characteristics as the speed is increased
above the rated value.
Figure 8-2 Torque and rated voltage against speed
Care must be taken to ensure the torque available above base speed is sufficient for the application
to run satisfactorily.
The saturation breakpoint parameters (Pr 05.029, Pr 05. 030, Pr 05.062 and Pr 05.063) found during
the autotune in RFC-A mode ensure the magnetizing current is reduced in the correct proportion for
the specific motor. (In open loop mode the magnetizing current is not actively controlled).
3, 6, 12 kHz 2, 4, 8, 16 kHz Open loop RFC-A / RFC-S
Level 1
3 kHz = 167μs
6 kHz = 83 μs
12 kHz = 83 μs
2 kHz = 250 μs
4 kHz = 125 μs
8 kHz = 62.5 μs
16 kHz = 62.5 μs
Peak limit
Current
controllers
Level 2 250 μs
2 kHz -500 μs
4 kHz - 250 μs
8 kHz - 125 μs
16 kHz - 125 μs
Current limit
and ramps
Speed controller
and ramps
Level 3 1 ms Voltage controller
Level 4 4 ms Time critical user interface
Background
Non-time critical user interface
Rated
voltage
Tor q ue
Speed
Speed
Rated speed
Powerdrive F300 Getting Started Guide English Iss2.book Page 99 Tuesday, July 28, 2015 3:23 PM
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