EXT556H turbo pump user manual

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EXT556H PAGE 14 INSTALLATION Figure 3 - Diagram of inlet screen - remove screws 'A' in order to remove the inlet screen. Do not remove screws 'B' Issue A 14 Aug 05
EXT556H If the inlet flange of the EXT556H is not connected to a rigid, firmly fixed vacuum system, ensure that the base of the pump is fixed to a firm support. Remove the four feet and secure the pump using eight M8 bolts through the tapped fixing holes in the base of the pump. These bolts should be in ISO 898-1 class 8.8 or higher, and should be tightened up to approximately 7Nm torque. If you are using a WCX555 water cooling accessory, mount through the cooling plate into the tapped holes on the base of the pump. PAGE 15 If the pump inlet is connected to the vacuum system using a vibration isolator, use the tapped fixing holes in the base of the pump to secure the pump to a firm support as described above. Alternatively, fit suitable restraints to prevent movement of the pump and fracture of the vibration isolator in the unlikely event of a seizure of the pump rotor. 3.3.3 Backing connection Use suitable vacuum tubing and connectors to connect the NW flange of the backing port to your backing pump. If necessary use flexible pipe or bellows to reduce the transmission of vibration from the backing pump to the EXT556H pump. INSTALLATION We recommend that you use a BOC Edwards RV backing pump. The minimum size of the backing pump required is given in Table 5. You may have to use a larger backing pump if you run the pump at a high inlet pressure or high throughput, or if you purge the pump. 3.4 Vent options, vent valve connection and control To maintain the cleanliness of your vacuum system we recommend that, whenever you switch the pump off, you vent the pump or the vacuum system when the speed of the EXT556H pump is between full rotational speed and 50% of full rotational speed. At and above 50% of full rotational speed the rotor spins fast enough to suppress any hydrocarbon oil from your backing pump. Venting may be accomplished by one of the following methods: • Use a TAV5 or TAV6 solenoid vent valve accessory (see Section 7) in place of the manual vent valve. • Use a TAV5 or TAV6 solenoid vent valve connected to a convenient flange on your vacuum system upstream of the turbo pump. • Use an alternative valve connected to your vacuum system upstream of the turbomolecular pump. The maximum rate of pressure rise is given in Figure 4. CAUTION If the EXT pump is to be backed by the interstage port of another turbomolecular pump, make sure that the backing pressure does not fall below 5 x 10 -4 mbar (5 x 10 -2 Pa). Lower backing pressures will increase the evaporation rate of the lubricant and so will reduce the life of the bearings. Vacuum system volume (litres) Orifice diameter (mm) < 20 < 1.0 < 10 < 0.7 < 5 < 0.5 < 2 < 0.35 Table 7 - Vent restrictor orifice diameter (with atmospheric pressure at the inlet) Aug 05 15 Issue A
Page 1 and 2: B777-50-880 Issue A Original Instru
Page 3 and 4: EXT556H CONTENTS Section Title Page
Page 5 and 6: EXT556H TABLES Table Title Page PAG
Page 7 and 8: 1 INTRODUCTION EXT556H 1.1 Scope an
Page 9 and 10: EXT556H 2 TECHNICAL DATA 2.1 Genera
Page 11 and 12: EXT556H 2.4 Purge gas specification
Page 13 and 14: EXT556H Parameter EXT556H Notes Max
Page 15 and 16: EXT556H PAGE 9 TECHNICAL DATA 1. In
Page 17 and 18: 3 INSTALLATION EXT556H 3.1 Unpack a
Page 19: EXT556H 3.3.1 The inlet screen (sup
Page 23 and 24: EXT556H CAUTION If you vent the pum
Page 25 and 26: EXT556H The EXC controller provides
Page 27 and 28: EXT556H 4 OPERATION WARNING PAGE 21
Page 29 and 30: EXT556H 5 MAINTENANCE WARNING PAGE
Page 31 and 32: EXT556H Symptom Check Action The EX
Page 33 and 34: EXT556H 6 STORAGE AND DISPOSAL 6.1
Page 35 and 36: EXT556H 7 SERVICE, SPARES AND ACCES
Page 37 and 38: EXT556H PAGE 31 SERVICE, SPARES AND
Page 39 and 40: EXT556H 7.4.6 FL20K foreline trap T

EXT556H turbo pump user manual

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