The logic interface can be plugged directly into the Edwards TIC Turbo Controller, TIC
Turbo Instrument Controller or TAG Controller and then use the functionality that they
provide. Alternatively the logic interface can be connected to the customer control
equipment.
For more information about the logic interface, refer to Logic interface connector on
page 41.
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 on page 72 for more detailed
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 Parallel control with serial
monitoring or serial configuration on page 21 and Motor controller configuration (serial
configuration) on page 21.
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.
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