Edwards EXC120

D396-14-880 Issue J
Page 32 © Edwards Limited 2008. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
3.13.3 Vent options
Note: The Axial Emergency condition is only available on the EXC300M Controller. On other Controllers, the
position of DIP switch 2 can be ignored.
DIP switches 2 to 4 are used to select the vent-valve control options (refer to Section 1.8). Select the required vent
options as shown in Table 10.
Note however, that if the electrical supply to the Controller fails, the Controller will always switch off the electrical
supply to the vent-valve when the EXT pump speed falls to below 50% of full speed (see Section 1.8.1).
Table 10 - Selection of vent-valve control options
DIP switch positions
Vent option(s) selected
2
(Vent on
Axial
Emergency)
3
(Vent on
Stop)
4
(Vent on
Stop)
Off Off Off No optional vent selected: Vent when EXT pump speed
falls to below 50% of full speed after Stop is selected.
Off Off On Vent on Stop.
Off On Off Vent on Fail and Vent when EXT pump speed falls to
below 50% of full speed after Stop is selected.
Off On On Vent on Fail and Vent on Stop.
On
*
*
Factory setting.
Off
*
Off
*
Vent on Axial Emergency
†
and Vent when EXT pump
speed falls to below 50% of full speed after Stop is
selected.
†
Only available on the EXC300M Controller.
On Off On Vent on Axial Emergency
†
and Vent on Stop.
On On Off Vent on Axial Emergency
†
and Vent on Fail and
Vent when EXT pump speed falls to below 50% of full
speed after Stop is selected.
On On On Vent on Axial Emergency
†
and Vent on Fail and
Vent on Stop.