SCU-800 Control Unit for Turbomolecular Pump
5. After completing the tuning, "Levitation" is displayed on the LCD and the rotating operation of the
STP pump can be started.
See Section 7, "MAINTENANCE", when an abnormality/error occurs other than above during the
tuning.
4.3 How to start/stop the STP pump
There are two methods of operating the STP pump; MANUAL and REMOTE. Select one which suits
your vacuum equipment.
4.4 Manual start/stop the STP pump
To manually start/stop the STP pump, slide the "MANUAL/REMOTE" changeover switch on the
SCU-800 front panel from the "ON" position, refer to Figure 9. The "REMOTE" LED will extinguish.
4.4.1 Starting the STP pump
1. Press the "START" switch on the front panel to start, refer to Figure 9 and accelerate the STP
pump. The "ACCEL." LED illuminates. The LCD displays the current rotational speed in "ACCEL:
***00rpm" in 500 rpm intervals (ACCELERATION state).
2. When the STP pump attains the rated speed of rotation, the "ACCEL." LED extinguishes, and the
"NORMAL" LED illuminates. The LCD displays "NORM: ***00rpm". (NORMAL OPERATION state)
4.4.2 Stopping the STP pump
1. Press the "STOP" switch on the front panel to stop the STP pump.
2. The "NORMAL" LED or "ACCEL." LED extinguishes, and the "BRAKE" LED illuminates (BRAKE
state).
3. When the rotational speed decreases to 500 rpm or less, the "BRAKE" LED extinguishes.
4.4.3 Starting the STP pump after stopping
1. Press the "START" switch on the front panel to accelerate the STP pump.
2. The STP pump can be accelerated even while it is stopping.
Note: Avoid frequent start/stop operations as this may cause the STP pump to overheat.
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