Edwards, nEXT Turbomolecular Pumps, nEXT240, nEXT300 and ...
Edwards, nEXT Turbomolecular Pumps, nEXT240, nEXT300 and ...
Edwards, nEXT Turbomolecular Pumps, nEXT240, nEXT300 and ...
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B800-00-880 Issue B<br />
Operation<br />
The green indicator on the Controller will illuminate when the pump reaches Normal speed (this is 80% of full<br />
rotational speed by default but you may have selected a different value to suit your application).<br />
4.4.2 Running at st<strong>and</strong>by speed<br />
To run the <strong>nEXT</strong> pump at St<strong>and</strong>by Speed, link the St<strong>and</strong>by control input to the 0 V control reference on the logic<br />
interface connector. If the pump is currently below St<strong>and</strong>by Speed then it will accelerate until it reaches St<strong>and</strong>by<br />
speed. If it is running faster than St<strong>and</strong>by Speed, it will decelerate until St<strong>and</strong>by Speed is reached.<br />
To return the pump to full speed, disconnect the St<strong>and</strong>by control input from the 0 V control reference on the logic<br />
interface connector.<br />
4.4.3 Stop the pump<br />
Stop the <strong>nEXT</strong> pump by disconnecting the Start/Stop control input from the 0 V control reference on the logic<br />
interface connector. The pump rotor will decelerate to rest.<br />
4.4.4 Parallel monitoring<br />
It is possible to monitor the following parameters:<br />
• Analogue output<br />
• Normal signal<br />
• Fail signal<br />
Refer to Section 3.6 for instructions on how to monitor these signals.The analogue output is described in Table 10.<br />
4.5 Operation with serial control <strong>and</strong> monitoring<br />
4.5.1 Delayed start<br />
If you are using a TAV solenoid valve controlled by the Controller, you may wish to close it before starting the <strong>nEXT</strong><br />
pump. This will allow the backing pump to reduce the pressure in your vacuum system.<br />
To close the vent valve, send the following comm<strong>and</strong>:<br />
The reply you receive will be in the following format:<br />
Comm<strong>and</strong> ! C 8 7 5 sp 1 cr<br />
Reply * C 8 7 5 sp r cr<br />
Note:<br />
This comm<strong>and</strong> overrides the current vent option <strong>and</strong> closes the vent valve. There is no open vent valve<br />
comm<strong>and</strong> but when you send a stop comm<strong>and</strong> to the pump the override is cleared.<br />
4.5.2 Start the pump<br />
To start the pump, send the following comm<strong>and</strong> over the serial communications link:<br />
The reply you receive will be in the following format:<br />
Comm<strong>and</strong> ! C 8 5 2 sp 1 cr<br />
Reply * C 8 5 2 sp 1 cr<br />
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© <strong>Edwards</strong> Limited 2009. All rights reserved.<br />
<strong>Edwards</strong> <strong>and</strong> the <strong>Edwards</strong> logo are trademarks of <strong>Edwards</strong> Limited.
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