SCU-800 Control Unit for Turbomolecular Pump
3.9 Adjustment methods
3.9.1 Tuning
Tuning is required to align the position of levitation in the STP pump axial direction with the centre of
the rotor's movable range. Tuning can be performed by pressing the "RESET" switch on the front panel.
(refer to Figure 10)
Tuning is required in the following cases in which the position of levitation may deviate from the centre
of the rotor's movable range:
When purchasing only the SCU-800 and connecting to the STP pump for the first time.
When changing the length of the STP connection cable (not when changing the length of the
power cable).
Connecting the same model but a different serial number of the STP pump to the SCU-800 after
the tuning is performed. The error message "CAUTION : Coupling is Changed" is displayed upon
performing the self test.
Connecting a different model of the STP pump to the SCU-800 after the tuning is performed. The
error message "CAUTION : Pump Type is Changed" is displayed upon performing the self test.
3.9.2 Tuning method
Refer to Figure 21.
1. Ensure all cables are connected.
2. Turn "ON" the MAIN POWER on the SCU-800 rear panel.
3. After the STP pump completes the self test and "Levitation" is displayed, set the
MANUAL/REMOTE changeover switch to the MANUAL and press the "RESET" switch on the front
panel for approximately 3 seconds.
4. See Section 4.2.2, "Tuning Method when "CAUTION" Message is Displayed after the Self Test"
when a "CAUTION" message is displayed during the autotest.
5. When the LCD displays "Tuning", release the "RESET" switch. The tuning is performed
automatically.
6. Approximately 1 minute later the LCD displays "Tuning Complete", and then displays "Levitation".
This completes the tuning.
Note: Tuning can be performed only while the STP pump is in the LEVITATION state. (It cannot be
performed while the STP pump is in the ACCELERATION, NORMAL OPERATION, or BRAKE
state)
When performing the tuning during remote operation, press the "RESET" switch on the front
panel after switching the "REMOTE" switch to MANUAL. (The remote signal cannot be used
for tuning)
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