STP-iX455/iXL455 Series Instruction Manual
12-2
Troubleshooting
12.2 Contents of WARNING Function
12.2.1 Damage Limit
Impact of the STP pump rotor onto the touch-down bearing, such as by an unexpected
in-rush of air from outside or in the event of power failure, can damage the touch-down
bearings. The STP pump monitors these impacts and assigns damage points to the
event of "Disturbance" or "Power Failure". When the accumulated damage point attains
120 points, the "Damage Limit" is detected.
The damage point increases with the rotational speed up to 15 point for each
"Disturbance", and 1 point for each touch-down at "Power Failure".
The accumulated damage points can be confirmed via serial communication, the
STP-Link (optional accessory) or the display unit iDT-001 (optional accessory).
12.2.2 Pump Run Time Over
There is a run-time counter that tracks the total running hours of the pump. When the
run-time counter attains the setting value, the "Pump Run Time Over" is detected.
When deposit accumulates inside the STP pump, this function can be used to consider
the time of the overhaul.
The setting value is user-definable.
Confirmation of the total running hours of the pump and change of the setting value can
be performed via serial communication, the STP-Link (optional accessory) or the display
unit iDT-001 (optional accessory).
12.2.3 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.
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