D396-20-880 EXC100E-L turbo controller

1.6.2 Internal Timer
The Internal Timer has two functions:
Firstly, when the EXT pump is started by the Controller, the Internal Timer in the Controller also
starts. If the EXT pump does not reach 50% of full rotational speed within the preset time
measured by the timer, the Controller will trip into Fail condition. This function cannot be
disabled.
Secondly, you can configure the Controller to enable or disable the Internal Timer if the pump
speed falls during pump operation:
• If you disable the Internal Timer, the Controller will trip into Fail condition as soon as the
pump speed falls to below 50% of full rotational speed.
• If you enable the Internal Timer, the Internal Timer will start as soon as the pump speed falls
to below 50% of full rotational speed; the Controller will trip into Fail condition if the pump
speed is still below 50% of full rotational speed at the end of the preset time.
The Controller is supplied with the Internal Timer enabled and adjusted for a preset time of
eight minutes. You can adjust the timer for your application: refer to Section 3.11.
EXC Turbomolecular Pump Controllers 7