STP-H803/H1303 Series Instruction Manual
10 Safety
Functions
10.1 Power
Failure
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Ⅰ
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Operation at a Power Failure>
When the power voltage drops below 80 V due to a power failure or other, the
normal operation of the magnetic bearing is maintained using the regenerative
energy of the rotating rotor (backup operation during a power failure).
1) When the rotational speed is 8,000 rpm or more at a power failure:
i. The STP control unit detects any power failure of 2 seconds or more and
the STP pump decelerates.
At this time, the "POWER" lamp goes out and the "FAILURE" lamp
lights. The LCD displays "Mains Failure." Also, an alarm signal is
output from REMOTE X7 pins (14)-(33) and (15)-(33).
When the rotational speed goes down to approx. 8,000 rpm, the rotor
lands on the touch down bearing and stops. The "FAILURE" lamp
goes out and the LCD is turned off. Also, the alarm signal output is
reset.
ii. The STP control unit does not detect a power failure of less than approx. 2
seconds, continuing rotating the STP pump.
2) When the rotational speed is less than approx. 8,000 rpm at a power failure:
Troubleshooting
The STP control unit does not detect the power failure. The rotor lands on
the touch down bearing and stops.
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Operation after a Power Recovery>
1) MANUAL operation
The magnetic bearing operation and LED lamp and LCD messages are
recovered after a power recovery. The "FAILURE" lamp goes out.
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The STP pump continues decelerating even after a power recovery. Press
the "START" switch to reaccelerate the STP pump.
2) REMOTE operation
The magnetic bearing operation and LED lamp and LCD messages are
recovered after a power recovery. The "FAILURE" lamp goes out.
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When the START signal is input to the REMOTE input pin after a power
recovery, the STP pump reaccelerates.
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When the START signal is not input to the REMOTE input pin after the
power recovery, the STP pump continues the BRAKE operation.
10-1
