| 摘要 |
PURPOSE:To drive all motors by setting constant-output point frequency and maximum frequency to arbitrary frequency. CONSTITUTION:A frequency command preparation circuit 5 prepares a frequency command by a speed command 1 and a maximum frequency command from a circuit 4 or a command from a maximum-frequency setting circuit 12. A voltage command preparation circuit 6 prepares a voltage command by the speed command 1 and a constant-output point frequency selecting switch 2 and the maximum frequency command from the circuit 4 or the speed command 1 and a constant-output point frequency setting circuit 11 and the command from the maximum-frequency setting circuit 12. When the constant-output point frequency setting circuit 11 is set to arbitrary frequency of 30-120Hz and the maximum-frequency setting circuit 12 is set to arbitrary frequency of 30-120Hz, the relationship of voltage outputted from an inverter 8 and frequency is shown in a section surrounded by (a) and (b) in the graph. |
