Simple Applications | International English |
5.8.9Boost. 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.
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.
Output Voltage %
120
100
80
60
40
20
Additional Voltage Boost
at Low Frequency
0 | 20 | 40 | 60 | 80 | 100 |
Figure | Voltage Boost |
5.8.10Serial Interface
The inverter can be controlled via a serial interface using terminals 14 and 15.
28 | MICROMASTER Applications Handbook |