Siemens A1 User Manual
Simple Applications
International English
28
MICROMASTER Applications Handbook
5.8.9
Boost. P1310, 11 and 12.
At low output frequencies the output voltage is low to keep the flux level constant,
as described earlier. However, the voltage may be too low to overcome losses in
the system. The voltage can be increased using parameter P1310. Parameter
P1311 will only produce boost during ramping, and is therefore useful for additional
torque during acceleration. If the boost is only required following a start command,
P1312 will apply this. Boost has no effect during vector operation because the
inverter calculates continuously the optimum operating conditions. Parameter
P1310 is set to 50% as factory default.
as described earlier. However, the voltage may be too low to overcome losses in
the system. The voltage can be increased using parameter P1310. Parameter
P1311 will only produce boost during ramping, and is therefore useful for additional
torque during acceleration. If the boost is only required following a start command,
P1312 will apply this. Boost has no effect during vector operation because the
inverter calculates continuously the optimum operating conditions. Parameter
P1310 is set to 50% as factory default.
The sum of P1310, 11 and 12 is limited to 250%.
The amount of boost is calculated from the stator resistance value and the Nominal
Current setting.
Current setting.
0
20
40
60
80
100
20
40
60
80
100
120
Additional Voltage Boost
at Low Frequency
O
utput V
ol
tage %
Figure 5-7
Voltage Boost
5.8.10 Serial
Interface
The inverter can be controlled via a serial interface using terminals 14 and 15.