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provide. Alternatively the logic interface can be connected to the customer control
equipment.
For more information about the logic interface, refer to
page 35.
3.4.1 USB interface
The USB service port is designed to work in conjunction with Edwards nST2 PC software.
The primary purpose of this interface is to allow easy configuration of the nEXT pump.
Some operational capabilities are provided, including START/STOP, to enable pump
operational checks to be made via the USB service port. However it is not intended as an
industrial control interface for unattended machine to machine (M2M) control.
The USB service port will support communications concurrently with the serial interface
in the logic interface connector. This enables the pump status and logs to be reviewed,
and the pump to be configured while the pump is installed and running.
The USB service port can only be used when the 48V d.c. power is applied.
3.4.2 Parallel control and monitoring
The simple parallel interface is a quick and easy way to control the pump.
This is the same interface used on existing 24 V Edwards Turbo Pumps. The controls that
are available to use are start and standby. The system status can be monitored using the
normal, fail and analogue output signals.
Refer to
Connect the parallel control and monitoring
instructions of how to use the parallel interface.
A system operating with only a parallel connection is not capable of adjusting the
configuration settings stored in the motor controller (for example, power limit setting or
controlled venting options). In this case, all these features would be at their factory
default settings. It is possible to manually adjust the standby speed if standby mode is
selected, however, the motor controller should be configured separately before fitting
the pump to the system. This is covered in more detail in
monitoring or serial configuration
configuration)
3.4.3 Serial control and monitoring
The serial communications link provides complete control and monitoring by using just
three signal lines.
The serial data lines share the same connector pins as the parallel signals standby and
fail. The serial data lines can be configured to provide an RS485 compliant or RS232
compatible interface by setting the position of the RS485/CAN/RS232 slide switch.
The serial enable signal must be linked to 0 V for the system to accept commands from
the serial link. This is a safety feature and acts as an interlock. For pure serial control, the
parallel start signal will be left unconnected.
The motor controller will still provide the normal and analogue signals on the logic
interface connector even when operating under serial control. The status of the normal
B8J200880_D
300812671_002_C3
B8J200880_D - Overview
on page 20 and
on page 20.
Page 19
Logic interface connector
on page 58 for more detailed
Parallel control with serial
Motor controller configuration (serial
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