STP-301/451 Series Instruction Manual
10-3
Troubleshooting
10.2 Abnormal State of Magnetic Bearing
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 falls on the touch down bearing and stops.
Simultaneously, the "FAILURE" lamp illuminates and the LCD displays error message
"DISTURBANCE".
◇ When an abnormality/error occurs in the magnetic bearing, check the STP pump as
well as the STP control unit, and contact service office.
10.3 Excessive Vibration
When serious vibration or mechanical shock causes the rotor to touch the touch down
bearing (due to external vibration/impact, intrusion of atmosphere or foreign particles into
the STP pump or rotor imbalance), the STP pump decelerates and stops.
Simultaneously, the "FAILURE" lamp illuminates and the LCD displays error message
"DISTURBANCE".
10.4 Motor Driver Overload
When the STP pump does not attain the rated speed within approx. 10 minutes after
starting or when the ACCELERATION state remains unchanged during operation for
approx. 10 minutes, the STP pump decelerates and stops. Simultaneously, the "FAILURE"
lamp illuminates and the LCD displays error message "OVERLOAD".
10.5 Overheating Inside the STP Pump
When the temperature of the motor inside the STP pump exceeds 110°C due to an abnormal
baking temperature or overload operation, the STP pump decelerates and stops.
Simultaneously, the "FAILURE" lamp illuminates and the LCD displays error message
"PUMP OVERTEMP".
10.6 Overheating Inside the STP Control Unit
When the temperature inside the STP control unit exceeds 70°C due to a failure in the air
cooling fan, external heat source, and other, the STP pump decelerates and stops.
Simultaneously, the "FAILURE" lamp illuminates and the LCD displays error message
"CONTROLLER OT".
10.7 Overspeed
When the rotational speed of the STP pump exceeds 51,400 rpm due to a failure in the motor
driver, the breaker in the STP control unit switches "OFF". The STP pump has no power
supplied and stops.
Simultaneously, the "FAILURE" lamp illuminates and the LCD displays error message
"OVERSPEED" or "DRIVERRA".
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