STP-iX457/iXU457 Series Turbomolecular Pump
MT-86E-001-F
Page 131
7
SAFETY FUNCTIONS
7 SAFETY FUNCTIONS
The STP pump is provided with safety functions for various abnormalities/errors. A safety function
operates when an abnormality/error occurs. The "STATUS" LED flashes in red or orange. Also, the
warning signal is output from the "X2 REMOTE" connector. If an abnormality/error is found when
using the STP pump, check it and take measures in accordance with the following procedures. If you
cannot trace it or if the STP pump does not function normally after the troubleshooting, contact
Service office.
7.1 Safety functions
7.1.1 Power Failure
When the power voltage drops below 20 V due to a power failure or another fault, the normal
operation of the magnetic bearing is maintained at the high rotational speed using the regenerative
energy of the rotating rotor (backup operation during a power failure).
The lowest rotational speed to which the magnetic bearing can operate at a power failure is called a
backup rotational speed.
1. When the rotational speed is approx. 24,000 rpm or more at a power failure:
The STP pump detects any power failure of 2 seconds or more and decelerates. At this time, the
the "STATUS" LED flashes in red. Also, a failure signal is output from FAILURE OUT pins
(10)-(14) of the "X2 REMOTE" connector.
When the rotational speed goes down to approx. 24,000 rpm, the rotor lands on the touch down
bearing and stops. All LCDs extinguish.
The STP pump does not detect a power failure of less than 2 seconds and the STP pump will
continue to rotate. Moreover, the STP pump does not detect a power failure during decelerating.
2. When the rotational speed is less than approx. 24,000 rpm at a power failure:
The STP pump does not detect the power failure. The rotor lands on the touch down bearing and
stops.
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