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Soft Starting the Varian Turbo Pumps

CAUTION! If the instrument’s Varian turbo pumps have just been

replaced, or have not been used in at least thirty days, a Soft Start

procedure will be required to prevent damage to the turbo pumps.

NOTE: Each instrument shipped will have the Soft Start function enabled.

This ensures that the first pumpdown at the customer site is done

under Soft Start conditions. To verify that Soft Start has been

enabled, or to re-enable Soft Start following an instrument shutdown

of more that 30 days, follow the procedure below. Once an

instrument’s turbo pumps have experienced a successful Soft Start,

the Soft Start procedure should be disabled.

To install the Navigator Software

1. Turn off the instrument.

2. Unplug the mains power cord from the bulkhead at the back right side of

the chassis.

3. Open the instrument’s front cover.

4. Loosen the locking screws on the System Controller module and the

DACs and Vacuum Gauge module, and pull them out. It is not necessary

to remove the modules, just ensure they are fully disconnected. This

prevents the firmware from starting the pumps as soon as the instrument

is powered up.

5. Turn on the instrument’s roughing pump.

6. Remove the source housing, and cover the orifice with a small piece of

paper or Teflon tape. This will allow the Soft Start procedure to be

completed in approximately one hour.

7. Connect the 9-pin serial cable connector (provided with the Navigator

software) to the computer’s serial connection port 1. Connect this cable
to the 9-pin serial cable attached to the controller for the V-301 pump.

8. Plug the mains power cord into the bulkhead at the back right side of the

chassis.

9. Turn on the instrument.

10. Select Start>Varian Vacuum Technologies>Navigator.

11. To establish communication with the V-301 turbo pump, select

Setting>Communication>ReInit.

12. Select V-301 Navigator and click OK.

13. To enable the Soft Start function, select Setting>Soft Start>Enable.

14. Select Setting>Communication>Stop to end communication.

NOTE: The Soft Start function will remain enabled after communication has

stopped and the serial cable connector has been disconnected.

15. Disconnect the 9-pin serial cable that is attached to the computer from

the 9-pin serial cable connector attached to the controller for the V-301

pump.

16. Connect the 9-pin serial cable connector that is attached to the computer

to the 9-pin serial cable attached to the controller for the V-902 pump.

17. To establish communication with the V-902 turbo pump, select

Setting>Communication>ReInit.

18. Select V-801 Navigator and click OK.

19. If V-801 Navigator does not appear on the list, select V-1001 Navigator

as its settings are identical.

20. To enable the Soft Start function, select Setting>Soft Start>Enable.

21. Select Setting>Communication>Stop to end communication.

NOTE: The Soft Start function will remain enabled after communication has

stopped and the serial cable connector has been disconnected.

22. Turn off the instrument.

23. Unplug the mains power cord from the bulkhead at the back right side of

the chassis. Leave the roughing pump running.

24. Push the System Controller module and the DACs and Vacuum Gauge

module back into the card cage. Finger-tighten the locking screws.

25. Plug the mains power cord into the bulkhead at the back right side of thechassis.

26. Turn on the instrument. The Vacuum On light will begin to flash, and theinstrument will begin the Soft Start cycle.
NOTE: The instrument can be pumped down overnight in Soft Start mode.After approximately 20 minutes, the instrument’s status light will turn off asthe turbos have not reached full speed within the Turbo-Timeout window;however, the instrument will continue to pump-down in Soft Start mode. TheV-902 turbo pump takes the most time to reach full speed (38 kRPM), andits status can be monitored by selecting Windows>Monitor. It will takeapproximately one hour to reach full speed. Once both pumps have reachedfull speed, Soft Start can be disabled.

To disable the Soft Start
NOTE: You cannot disable Soft Start mode while the pumps are running.
1. Turn off the instrument.
2. Unplug the mains power cord from the bulkhead at the back right side ofthe chassis. Leave the roughing pump running.
3. Open the instrument’s front cover.
4. Loosen the locking screws on the System Controller module and theDACS and Vacuum Gauge module, and pull them out. It is not necessaryto remove the modules, just ensure they are fully disconnected. Thisprevents the firmware from starting the pumps as soon as the instrumentis powered up.
5. Connect the 9-pin serial cable connector (provided with the Navigatorsoftware) to the computer’s serial connection port 1. Connect this cableto the 9-pin serial cable attached to the controller for the V-301 pump.
6. Plug the mains power cord into the bulkhead at the back right side of thechassis.
7. Turn on the instrument.
8. Select Start>Varian Vacuum Technologies>Navigator.
9. To establish communication with the V-301 turbo pump, selectSetting>Communication>ReInit.
10. Select V-301 Navigator and click OK.
11. To disable the Soft Start function, select Setting>Soft Start>Disable.
12. Select Setting>Communication>Stop to end communication.
13. Disconnect the 9-pin serial cable that is attached to the computer fromthe 9-pin serial cable connector attached to the controller for the V-301pump14. Connect the 9-pin serial cable connector that is attached to the computerto the 9-pin serial cable attached to the controller for the V-902 pump.
15. To establish communication with the V-902 turbo pump, selectSetting>Communication>ReInit.
16. Select V-801 Navigator and click OK.NOTE: If V-801 Navigator does not appear on the list, select V-1001Navigator as its settings are identical.
17. To disable the Soft Start function, select Setting>Soft Start>Disable.
18. Select Setting>Communication>Stop to end communication.
19. Turn off the instrument.
20. Unplug the mains power cord from the bulkhead at the back right side ofthe chassis. Leave the roughing pump running.
21. Push the System Controller module and the DACs and Vacuum Gaugemodule back into the card cage. Finger-tighten the locking screws.
22. Plug the mains power cord into the bulkhead at the back right side of thechassis.
23. Turn on the instrument.