| 摘要 |
<p>PURPOSE:To omit the installation of the voltage-frequency converter for driving SSRH counter in the control circuit of each stand, and to contrive the simplification of overall constitution, by obtaining the correction work pulse for SSRH counter from the detector for the motor speed. CONSTITUTION:The speed reference signal V0 common to each stand being produced from MRH count 1 is multiplied 2 by SSRH counter 6 of each stand; the result of this multiplication is converted to the analogue signal 3 and is produced as the individual speed reference signal Vn for each rolling mill. Next, this signal Vn is inputted to SCR power source 17 for driving the motor 16; and the pulse signal proportional to the rotational speed of the motor 16, that is the signal Vn, is produced from the speed detector 15. Then, when the speed correction becomes necessary and the logic signal LK is produced, the gate 7 is opened for the scheduled period of time in order to send the pulse output signal Pn of the detector 15 to the counter 6 which then counts the pulse signal Pn. That is, if the signal Pn is large, the working speed of the counter 6 becomes faster; accordingly, the correction work similar to using the conventional VFC signal for actuating the counter 6 can be performed.</p> |
