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Page 15
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Installation
B723-00-880 Issue C
When the TIC System OFF is selected:
z
Switch off both the backing pump and the turbomolecular pump.
z
Close the backing valve.
EXDC pump controllers:
z
Open the TAV vent valve fully after the turbomolecular pump has slowed to 50% of its rotational speed.
DX pump controllers:
z
Open the TAV vent valve (controlled venting) from 100–50% rotational speed, and then open fully from 50% of
full rotational speed.
Notes:
1 The TAV vent valve and LCPVEK backing valve are optional extras.
2 The TIC Controller factory settings have been changed to provide a standard operation for the EXPT
Pumping Station, if you replace the TIC Controller you should reconfigure the set up options to suit your
application, refer to the TIC instruction manual for further details.
3 * If your EXPT Pumping Station uses an XDD1 diaphragm pump, the turbomolecular pump drive will be
delayed for two minutes while the backing pump reduces the pressure to a suitable level, this is typical
for a five litre volume and will prevent the turbomolecular pump from running under high pressure for
a prolonged period. This delay is adjustable (refer to the TIC instruction manual) and is recommended
for system volumes >2 litres, refer to
to estimate the turbomolecular start delay if you know
your system volume.
Figure 4 - Turbomolecular pump start delay with XDD1 diaphragm pump
