CAUTION:
Do not operate the pump with its rotor exposed. Before operating the pump it must
first 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
rotating blades might not be visible.
7.2.4 Alternative valve connected to the vacuum system
When using another vent valve, ensure that a suitable vent restrictor is fitted to the
vacuum system to limit the rate of pressure rise.
Refer to Table: Vent restrictor orifice diameter if venting the vacuum system chamber for
information about vent restrictor sizes. If a suitable vent restrictor is not fitted, open the
vent valve only after the speed of the pump has fallen to 50% of full rotational speed.
Vacuum system volume (litres)
7.3 Operation with parallel control and monitoring
7.3.1 Start the pump with parallel control
In parallel control the pump will accelerate to full operating speed when started.
Start the nEXT 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 rotational speed by default but a different value may
have been selected to suit the application.
7.3.2 Run the pump at standby speed with parallel control
If the pump is running below or above standby speed it will accelerate or decelerate
until standby speed is reached.
CAUTION:
When power is restored following a power cut, the pump will restart automatically.
The pump must remain connected to the vacuum system to prevent risk of injury.
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.
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