STP-iS2207 Series Turbomolecular Pump
MT-89E-001-C
Page 135
7
SAFETY FUNCTIONS
7.3.4 Pump Overload
"Pump Overload" is displayed when the state that the motor current exceeding the setting value
continues during the fixed time or the state that the STP pump rotational speed drops below the
setting value continues during the fixed time. However, the motor current and the rotational speed are
monitored only in the NORMAL state.
When the deposit accumulates in the STP pump, the load in NORMAL state may gradually grow with
the operating time. Considering the time of the overhaul, this "WARNING" function can be used.
The current setting value and rotational speed setting value are user-definable. "Pump Overload"
warning can be released by setting the warning function to disable after it is detected.
The setting can be changed via serial communication, the STP-Link (optional accessory) or the
display unit iDT-001 (optional accessory).
7.3.5 Imbalance
The STP pump continuously monitors its rotor balance. The "Imbalance" is detected when imbalance
of the synchronized rotor with the rotational speed exceeds the setting value.
When the deposit accumulates in the STP pump, with the increase of the STP pump operation hours,
the rotor balance is lost and the imbalance increases gradually. An increase in the amount of deposit
may lead to a malfunction of the STP pump. Perform the overhaul ahead usual case.
The setting value of the imbalance is fixed, and the user cannot set it.
Set the "WARNING" function of the Enable/Disable to disable to release the "Imbalance X_H",
"Imbalance X_B" or "Imbalance Z". The setting can be changed via serial communication, the
STP-Link (optional accessory) or the display unit iDT-001 (optional accessory).
7.3.6 Other Warning
Occurrence condition Pump operation Countermeasures
Air-cooling fan failure in control
unit
(FAN Warning)
Continuing operation
When operating continuously,
STP pump may overheat and
detect overheat abnormality.
Contact Service office.
Unexpected restart of control
unit during the pump rotation
(C/U Restart)
Each interface signal
re-outputs the current status
after initialization. At warning
detection, if the pump is in
normal operation or
acceleration, the pump
accelerates again and
operates continuously.
Influence of external noise.
Check the setting of STP pump,
and take measures to reduce
the influence of external noise.
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