STP-301/451 Series Instruction Manual
9-3
Operation
9.2 Setting the Rated Speed
The STP pump can be set (changed) to the required rated speed in the range of 25,000 to
48,000 rpm, in units of 500 rpm. The setting can be performed even during rotation of the
STP pump. The rated speed is set to 48,000 rpm at delivery.
The rated speed setting mode is entered by setting dip switch 1 of DSW-B on the top panel to
the ON position.
The rated speed is set to 48,000 rpm (initial setting) by setting dip switch 1 to the OFF
position.
For the position of the DSW-B switch, see Figure 6.3, "STP Control Unit Top Panel".
Prepare the following tool for setting the rated speed:
z Small-sized screwdriver
9.2.1 When Setting DSW-B No. 1 to ON under Power-ON State
1) Set dip switch 1 of DSW-B to the ON position.
The LCD displays "SET= ***00rpm," which indicates the rated speed setting mode.
The speed displayed here depends on the current position dialed with the VR1 volume
on the top panel.
2) Turning the VR1 volume on the top panel changes the value "***00rpm" on the rated
speed setting display "SET= ***00rpm."
Turn the VR1 volume clockwise to increase the rated speed, or counterclockwise to
decrease the rated speed, until the required rated speed is displayed.
Note that the rated speed is not yet determined in this state.
3) To determine the rated speed displayed in "SET= ***00rpm," press the "START" switch.
When the STP pump is in the ACCELERATION or NORMAL OPERATION state, it
accelerates or decelerates up to the set value of rated speed.
When the STP pump is in the LEVITATION or BRAKE state, the pump's state remains
unchanged.
Note that the rated speed is not determined if the "START" switch is pressed when the
LCD message is other than "SET= ***00rpm".
4) Press the "SELECT" switch once, and the LCD displays the set value of rated speed in
"RATING: ***00rpm." Make sure the required rated speed is displayed.
If the required speed is not displayed or the rated speed is to be changed again, press the
"SELECT" switch to display "SET= ***00rpm" again. Then, perform steps 2) and 3)
again to set the rated speed.
5) When the STP pump is in the LEVITATION or BRAKE state, perform STP pump
rotation operation to rotate it. The STP pump accelerates up to the rated speed.
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