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 12)
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-1601 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).
• When connecting the standard specification pump of STP-XA2703 / XA3203 series to the
SCU-1601, the error message "CAUTION : Coupling is Changed" is displayed. In this case,
various settings are initialized after the tuning is performed. As needed, perform the reset
operation from the front panel.
• SCU-1601 is a control unit dedicated to the STP-XA2703BV155 / XA3203BV155. DO NOT
connect to other models. When an STP pump other than the STP-XA2703 / XA3203 series is
connected to the SCU-1601, the message "CAUTION: Pump Type is Mismatch" is displayed
upon performing self-test. In this case, the tuning cannot be performed.
3.9.2 Tuning method
Refer to Figure 25.
1. Ensure all cables are connected.
2. Turn "ON" the MAIN POWER on the SCU-1601 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, ""CAUTION" message in the self test state" 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.
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