Edwards SCU-1600

SCU-1600 Control Unit for Turbomolecular Pump
March 10 29 Issue 1-a
3
INSTALLATION
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 simply 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-1600 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-1600 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-1600 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 23.
1. Ensure all cables are connected.
2. Turn "ON" the MAIN POWER on the SCU-1600 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.