STP-301/451 Series Instruction Manual
5-3
Installation
5.2.2 Air Cooling Method
When water cooling is not available, use an air cooling unit (optional accessory).
Attach the air cooling unit using 4 screws at screw holes for legs (8-M8
*1
, depth 16 mm).
(For the positions of the screw holes for legs, see "External Appearance of the STP Pump")
◇ Since the air cooling unit is attached using 4 screw holes for legs, the base for
securing the STP pump cannot be installed using screw holes for legs (see Section
4.3.3, " How to Secure the STP Pump"). When using the air cooling unit, design
your vacuum equipment so that the STP pump installing flange at the vacuum
equipment side can withstand the torque generated by the abnormal STP pump.
◇ Check the rated voltage of the air cooling unit before use.
◇ Procure a breaker or fuses for the air cooling unit (remote terminal block TB1
incorporates fuses).
◇ When connecting the power for the air cooling unit to the remote terminal block (I/O
TB1), attach a metallic cover or a similar part to the terminal block to ensure the
safety.
◇ DO NOT apply excessive force to the cable for the air cooling unit.
Follow the steps below to run the STP pump associated with the air cooling unit (read
through Section 8, "Remote Input/Output Signal Terminal Blocks," then operate them.)
1) Connect the power cable of the air cooling unit between "I/O TB1 FAN OUT Terminals
(3)-(4)."
2) Input the power supply for the air cooling unit between "I/O TB1 AC. POWER IN
Terminals (1)-(2)."
3) The air cooling unit functions under the "ACCELERATION" or "NORMAL
OPERATION" state.
4) The air cooling unit stops when the STP pump stops.
*1
JIS
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