SCU-1601 Control Unit for Turbomolecular Pump
4.2 Powering ON
4.2.1 Self test
Refer to Figure 35.
1. Switch the MAIN POWER to "ON", located on the SCU-1601 rear panel, refer to Figure 13. (To
prevent incorrect operation, a metal fitting is attached to the breaker. Loosen the screw, lift the
metal fitting and secure it.) The SCU-1601 performs a self test and "Autotest" is displayed on the
LCD.
2. If no error is found, the LCD displays "Autotest complete" and the magnetic bearing is turned "ON".
When the rotor levitates normally, the LCD displays "Levitation" and the STP pump can be
operated.
4.2.2 "CAUTION" message in the self test state
CAUTION
This SCU-1601 is a control unit dedicated to the STP-XA2703BV155 / XA3203BV155.
When the SCU-1601 is connected to the STP-XA2703BV155 / XA3203BV155 pump, the CAUTION
message is not displayed, but when connected with other pumps, the CAUTION message is
displayed. Check if a wrong pump is connected.
When the configuration (the STP pump serial number or the SCU-1601) is changed, a "CAUTION"
message is displayed on the LCD during the self test. Refer to Table 37 when "CAUTION" is other
than those in Table 7.
Connecting the standard model of the STP pump to the
SCU-1601.
Using the different series of the STP pump with this SCU-1601
control unit. Use the specific control unit.
Table 7 - Causes of "CAUTION" at the self test state
If "CAUTION: Coupling is Changed" is displayed, operation is possible by performing the followings,
but the settings of the pump connected previously are overwritten by the changed pump settings. To
operate the STP-XA2703BV155 / XA3203BV155 pump again, re-register the setting data.
1. When pressing the "RESET" switch, the LCD displays the model name of the STP pump currently
connected and the confirmation message to copy the data of the STP pump onto the SCU-1601.
Example: "STP-XA2703/XA32033", "DATA COPY? No"
2. When the exact model name is displayed, press the "UP" or "DOWN" switch. "DATA COPY? Yes"
is displayed on the LCD. In the case of the LCD displays an unexpected model name of the STP
pump, turn the breaker "OFF." After checking the configuration, re-start the STP pump.
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