STP-301/451 Series Instruction Manual
7-5
Operation
7.5 Remote Operation (I/O TB2)
(Read through Section 8.2, "I/O TB 2 Terminal Block" before use.)
Slide the "MANUAL/REMOTE" changeover switch on the STP control unit front panel to
"ON". The "REMOTE" lamp illuminates.
7.5.1 Powering ON
1) Switch "ON" the breaker on the STP control unit rear panel.
(To prevent incorrect operation, a metal fitting is attached to the breaker. Loosen the
screw, lift the metal fitting, then secure it.)
The magnetic bearing functions and the rotor levitates (POWER ON state).
The "POWER" lamp illuminates.
2) The STP control unit executes the self test. If no error is found, the LCD displays
"LEVITATION".
7.5.2 Starting/Stopping the STP Pump
There are three methods of starting/stopping the STP pump. Use one of them.
Table 7.1 Starting/Stopping the STP Pump during Remote Operation (I/O TB2)
Method Starting the Pump Stopping the Pump
1 1) With the circuit between (2)-(3) shorted, short
the circuit between (1)-(4).
2) Short the circuit between (4)-(5) for 0.3
seconds or more.
However, when inputting the signal
simultaneously with switching "ON" the
breaker on the rear panel, continue to short
the circuit for 5 seconds or more.
Open the circuit between (1)-(4).
2 With the circuit between (2)-(3) shorted, short the
circuit between (1)-(5).
Open the circuit between (1)-(5).
3 Input 25 V AC or 12 to 48 V DC between (3)-(5).
With DC, the (+) side can be connected to either
(3) or (5).
Open the circuit between (3)-(5).
◇ When using method 3 shown in the above table, 25 to 250 V AC can be input. In
this case, attach a metallic cover or a similar part to the terminal block to ensure the
safety.
◇ The STP pump can be started by remote operation with any message displayed on
the LCD.
◇ Although the STP pump sounds for several seconds while it is accelerating, this is
not an indication of abnormality.
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