| 摘要 |
<p>PURPOSE:To perform control stably and accurately, by comparing a temperature of a body to be heated and a set temperature of a program at a differential device, feeding back the output to an input side of the differential device and performing a program control after the output of the differential device is closed to zero. CONSTITUTION:A signal of a temperature sensor 1 is inputted to an input terminal 2A of a differential device 2 and a signal of an electric signal generating circuit 3 is to a terminal 2B. The output of the device 2 is inputted to an automatic control circuit 4 and given to a discriminator 6 via a switch 5. First, the switch 5 is closed and a switch 5A is opened. When an output from the device 2 is positive (negative), the discriminator 6 outputs a positive (negative) signal 6A(B), a counter 3B up(down)-counts a clock pulse 3A, D/A conversion 3C is done and the pulse is inputted 2B to the device 2 and the output is closed to 0. Then, the switch 5 is opened and the 5A is closed, the system is automatically, controlled 4 with a program 7 and an output circuit 8 is driven. Thus, rapid change of temperature at the start of control can be prevented, allowing to perform safe and accurate temperature control.</p> |
