STP-301/451 Series Instruction Manual
7-3
Operation
There are two methods of operating the STP pump: MANUAL and
REMOTE.
Select one which fits your vacuum equipment.
7.4 Manual Operation
Slide the "MANUAL/REMOTE" changeover switch on the STP control unit front panel to the
position opposite to "ON". At this time, the "REMOTE" lamp is off.
7.4.1 Powering ON
1) Switch "ON" the breaker on the rear panel.
(To prevent incorrect operation, a metal fitting is attached to the breaker. Loosen the
screw, lift the metal fitting, and secure it.)
The magnet bearing functions and the rotor levitates (POWER ON state).
The "POWER" lamp illuminates.
2) The STP control unit executes the self test. If no error is found, the LCD displays
"LEVITATION".
7.4.2 Starting the STP Pump
1) Press the "START" switch on the front panel to start and accelerate the STP pump.
The "ACCEL." lamp illuminates. The LCD displays the current rotational speed in
"ACCEL: ***00rpm" in units of 500 rpm (ACCELERATION state).
2) When the STP pump attains the rated speed of rotations, the "ACCEL." lamp
distinguishes, and the "NORMAL" lamp illuminates. Also, the LCD displays "NORMAL:
***00rpm" (NORMAL OPERATION state).
◇ The STP pump can be manually started only when the LCD displays "LEVITATION"
or "BRAKE: ***00rpm".
In the case of another message displayed, press the "SELECT" switch one or more
times until "LEVITATION" or "BRAKE: ***00rpm" is displayed.
◇ Although the STP pump sounds for several seconds while it is accelerating, this is
not an indication of abnormality.
7.4.3 Stopping the STP Pump
1) Press the "STOP" switch on the front panel to stop the STP pump.
The "NORMAL" lamp or "ACCEL." lamp distinguishes, and the "BRAKE" lamp
illuminates (BRAKE state).
(The "BRAKE" lamp does not illuminate when the number of rotations is less than 500
rpm.)
2) The "BRAKE" lamp distinguishes when the number of rotations goes below 500 rpm.
◇ The STP pump can be stopped with any message displayed in the LCD.
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