Yamato Scientific Vacuum controller Vacuum controller - Manual (Page 14)

12
Operation
There are three modes, the fixed value control, the ramp control, free mode (control-
free), as a series in the operation menu.
‹ In the fixed value control mode, step-control runs, aiming at the pressure set point which is
selected freely.
‹ In the ramp control mode, the ramp control runs, aiming at the preset ramp level in the fixed
ramp time.
‹ In the free mode, the pressure control is cancelled and the solenoid valve is kept opening.
‹ In any control mode, the operation stops after pressing ENTER again. In this case, the
solenoid valve for control is closed and the leak valve is opened.
‹ Shifting to other control mode during operation is accepted in four cases;｢the fixed value
control ←→ the free mode｣ ｢the ramp control→ the fixed value control｣ ｢the ramp control
→the free mode｣. To shift the mode, press OPERATION MENU. The selecting mode
appears on the indicator, showing a feasible control(depending on what operation is
running). Pressing OPERATION MENU makes control modes scroll. Select the control mode
you desired and press ENTER. The present operation continues unless ENTER, which is
used to decide the control mode, is pressed.
‹ After turning the power on, the fixed control mode is automatically selected. Everytime
OPERATION MENU is pressed, the modes, the ramp control mode, the free mode, the fixed
value control mode, shift and scroll in order.
‹ The operation menu is accepted either before or during operation. If the control menu key
was pressed during operation, the control mode which is placed next to the present mode is
selected. Press ENTER, which is used to decide the control mode, and the operation is shift.
‹ It is possible to stop shifting the operation mode, if it is done on the verge of pressing ENTER.
Press OPERATUON MENU and select the present operation mode again, or leave it. All
function selecting and set point editing, which have been done during selecting the operation
mode in the function menu,are cancelled.
‹ If there is no key operation for ten seconds after pressing OPERATION MENU, the display
returns to the original state.