STP-iXA4507 series Turbomolecular Pump
7.1.2 Operation after a power recovery
1. The STP pump continues decelerating, and power failure detection is reset automatically.
At this time, the "STATUS" LED will change from red flash to orange flash.
In the case of the I/O Remote interface, a failure signal is also simultaneously reset on FAILURE
OUT pins, (14)-(33) and (15)-(33) of the "X4 REMOTE" connector.
2. When the START signal is input after a power recovery, the STP pump reaccelerates even while
it is in BRAKE state.
However, the control unit may detect excessive vibration when power is recovered after the rotor
lands on the touch down bearing (see 7.1.4). In this case, the STP pump once stops and cannot
reaccelerate until the RESET operation is completed.
Note: It is recommended to make a sequential control system to supply the power to the STP pump
immediately after a power recovery.
7.1.3 Abnormal state of magnetic bearing (Disturbance)
CAUTION
Check the STP pump when an abnormality or error occurs in the magnetic bearing.
If "FAILURE" cannot be released after reset operation, contact our Service office.
When the magnetic bearing does not function normally due to a breakage of the STP connection
cable, disconnection of connectors or any abnormality/error of the STP control circuit, the rotor lands
on the touch down bearing and stops, and the "STATUS" LED flashes in red.
In the case of the I/O Remote interface, a failure signal also simultaneously outputs from the "X4
REMOTE" connector.
7.1.4 Excessive vibration (Disturbance)
The STP pump decelerates and stops when the rotor contacts with the touch down bearing for a
certain period of time due to external vibration/impact, intrusion of the atmosphere, some
contaminations into the STP pump, or rotor imbalance, and the "STATUS" LED flashes in red.
In the case of the I/O Remote interface, a failure signal also simultaneously outputs from the "X4
REMOTE" connector.
Note: When the rotor contacts the touch down bearing, contact noise and rotational noise of the
touch down bearing are generated from the STP pump.
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