Alternave valve connected to the vacuum system
When using another vent valve, ensure that a suitable vent restrictor is ed to the vacuum
system to limit the rate of pressure rise.
Refer to Table 8 on page 48 for informaon about vent restrictor sizes. If a suitable vent
restrictor is not ed, open the vent valve only aer the speed of the pump has fallen to 50%
of full rotaonal speed.
Table 8
Vent restrictor orice diameter if venng the vacuum system chamber
Vacuum system volume (litres) Orice diameter (mm)
< 20 < 1.0
< 10 < 0.7
< 5 < 0.5
< 2 < 0.35
Operaon with parallel control and monitoring
Start the pump with parallel control
WARNING:
Do not operate the pump with its rotor exposed. Before operang the pump it must rst
be connected to the vacuum system. If the pump is operated with its rotor exposed, the
pump rotor can cause injury as it rotates at very high speeds and the rotang blades might
not be visible.
WARNING:
Do not move the pump whilst it is running. The gyroscopic forces generated by this
movement can cause excessive use of the back-up bearing and may result in catastrophic
failure of the pump.
WARNING:
When power is restored following a power cut, the pump will restart automacally. The
pump must remain connected to the vacuum system to prevent risk of injury.
In parallel control the pump will accelerate to full operang speed when started.
Start the nEXT85 pump by linking the start/stop control input to the 0 V control reference on
the logic interface connector.
The green indicator on the motor controller will illuminate when the pump reaches normal
speed. This is 80% of full rotaonal speed by default but a dierent value may have been
selected to suit the applicaon.
B8G0-00-880A -
Operaon of the nEXT85
Page 48
To Next Page
Loading...
Need help?
General
