Edwards nEXT200200, Инструкция по эксплуатации

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A feature is given that allows a delayed start of the nEXT pump. With this feature, the
vent valve can be closed before starting the nEXT pump. This allows the backing pump to
decrease the pressure in the vacuum system before starting the nEXT pump.
If the controller is not used to control a TAV vent valve, it can be used to operate a fan.
You can configure the controller to permanently enable the fan.
2.3.6 Normal speed setting
The normal speed is a user
‑
selectable parameter which can be set from 50% to 100% of
full rotational speed.
When the pump gets to normal speed, a signal is available on the normal pin of the logic
interface connector. The signal can be used to control the application as it shows that
the vacuum performance (pump speed) is at a set level. The default setting is 80% of the
full rotational speed. Refer to Normal speed setting on page 59 for instructions to
change the normal speed setting.
2.4 Logic interface
The pump controller can be operated only through the logic interface. The signals on the
logic interface are of three types:
▪ Control inputs: Switch
‑
type signals that are used to control the pump
▪ Status outputs: To identify the status of the system
▪ Analogue output: Gives a 0
‑
10 V output for a number of pump parameters.
The logic interface supports the serial control and the parallel control to monitor and
control through one connector. For serial control, RS232 (default) or RS485 can be
selected using the RS485 / RS232 slide switch which is given on the motor controller.
Refer to Connection for serial control and monitoring on page 41 .
You can plug the logic interface into the manufacturer's TIC Turbo Controller or
TIC Turbo Instrument Controller and then use the given functionality. The logic interface
can be connected to the customer control system as an alternative.
Refer to
Logic interface connector on page 27 for more information about the logic
interface.
2.4.1 Parallel control and monitoring
The simple parallel interface is a quick and easy way to control the pump. Same interface
is used on the 24 V manufacturer's Turbo Pumps. The start and standby controls are
available to use. You can monitor the system status using the normal, fail and analogue
output signals.
Note:
The serial enable switch must be open (no connection) and the slide switch must be in
the RS232 position. Refer to Connect the parallel control and monitoring on page 40 .
Refer to Connect the parallel control and monitoring on page 40 for more instructions
about how to use the parallel interface.
A system that is in operation with a parallel connection only is not capable to adjust the
configuration settings stored in the controller (for example, power limit setting or
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B85200880_D - Introduction