D396-20-880 Issue H
Page 6
© Edwards Limited 2015. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
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
.