Currently, for the nST software, a free license is necessary to use the software. To get a
free license, obey the on
‑
screen instructions, complete the user data form and send the
automatically generated email to us.
The controller has five indicator LED's which signal the general status, operation and
service status of the pump. The LEDs can be used for fault finding if a problem occurs.
Refer to
on page 31.
The motor controller has built
‑
in safety features to prevent the pump from damage
during sustained high pressure or temperature.
▪
The electronics constantly monitors the temperature in the controller and the
temperature of the motor in the pump. If the controller or the motor gets too hot,
the controller decreases the power supplied to the pump motor and the pump
speed decreases. If the rotational speed of the pump decreases below 50% of the
full speed, the electronics can trip into a fail condition, depending on the system
configuration. Refer to
on page 13.
▪
If the pump inlet pressure increases, the power supplied to the pump motor
increases to counteract the gas frictional load. When the built
‑
in maximum power
limit is reached, the speed of the pump starts to decrease. If the rotational speed
of the pump decreases below 50% of the full speed, the electronics can trip into
fail condition, depending on how the system has been configured. Refer to
on page 13.
If the electrical supply fails, the controller uses the motor in the pump as a generator.
This means the pump has its own regenerative supply and a separate battery for
emergency power backup is not necessary. The regenerated energy maintains the
electrical supply to the controller, the vent valve or the fan attached to the controller
connector until the pump speed decreases below 50% of the full rotational speed to
make sure that the vent valve stay shut until below 50% of the full rotational speed and
prevent the pump from venting at full speed. It makes sure that the serial link and
signals on the parallel interface stays active until the pump speed decreases below 50%.
2.4 Operational features
The pumps have basic start and stop commands and some other features that allow the
pump operation to be modified for an applicable application.
2.4.1 Power limit setting
Select the maximum power that will be drawn by the pump. The more power supplied,
the quicker the pump will accelerate to reach full speed.
If the application requires fast cycling or higher gas loads, set the power limit to the
maximum value. If ramp time is not important in the application, use a lower power
limit, down to a minimum value (refer to
). Also ensure there is
sufficient cooling for the application.
Ensure that the power supply is capable of delivering sufficient power to the nEXT pump.
By choosing a lower power limit setting, a smaller power supply may be used. For more
information, refer to
on page 24.
07/2021 - ©Edwards Limited
Page 12
B8G000880_E
B8G000880_E - Introduction
Summary of Contents for nEXT 55
Page 110: ...This page has been intentionally left blank...
Page 114: ...This page has been intentionally left blank...
Page 115: ...This page has been intentionally left blank...
Page 116: ...edwardsvacuum com...