STP Series Turbomolecular Pump
4 OPERATION
This section is an extract from the STP Control Unit Instruction Manual (C). Read the STP Control
Unit Instruction Manual (C) of carefully before operating the STP pump.
4.1 Before starting the STP pump
CAUTION
NEVER connect or disconnect any cables while the power is ON.
NEVER turn the primary power OFF (turn the MAIN POWER "OFF") while the STP pump is in
rotation. DO NOT release the inlet port flange or outlet port flange into the atmosphere while the
STP pump is rotating.
After completing the installation of the STP pump carry out the following checks before starting:
1. Ensure the STP pump is installed correctly (refer to Section 2, "INSTALLATION OF THE STP
PUMP").
2. Ensure all cables are securely connected and locked.
3. Ensure the correct supply voltage is applied.
4.1.1 Tuning
CAUTION
DO NOT turn off the primary power (DO NOT switch the breaker "OFF") during tuning. When doing
so, perform tuning again.
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 STP pump or STP control unit and connect for the first time (The
error message is displayed upon performing the self test except for SCU-350 series).
• When changing the length of the STP connection cable (not when changing the length of the
power cable).
• Connecting the different STP pump (model, serial No.) to the STP control unit after the tuning is
performed (The error message is displayed upon performing the self test except for SCU-350
series).
Refer to the STP Control Unit Instruction Manual (C) for the method of the tuning.
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