Edwards nEXT85 User Manual

The electronic braking is not available when operang from supply voltages above 24 V d.c.
+10%.
When operang from supply voltages below 24 V d.c. +10%, the electronic braking opon may
be enabled to reduce the pump deceleraon me and to recover some energy from the pump.
This is achieved by returning power from the pump to the electrical supply. The rate at which
electrical energy is returned to the supply is regulated so as to limit the supply voltage to 24 V
d.c. +10%. In order to achieve the fastest electronic braking mes there must be somewhere
for the returned power to go, such as:
• A supply capable of receiving the returned power
• Other devices sharing the 24 V d.c. bus with the pump
• A load resistor of approximately 10 Ω switched across the 24 V d.c. supply when
decelerang the pump
Logic interface
The motor controller can only be operated through the logic interface. There are three types
signals on the logic interface.
The signal types are:
• Control inputs: these are switch-type signals that are used to control the pump
• Status outputs: these outputs
idenfy the status of the system
• Analogue output: this provides a 0 – 10 V output for a number of pump parameters
The logic interface has been designed to support both serial and parallel control and
monitoring, operang through one connector. For serial control either RS232 (default) or RS485
can be selected using the RS485/RS232 slide switch located on the motor controller (refer to
Connecon for serial control and monitoring on page 28).
The logic interface can be plugged directly into the Edwards TIC Turbo Controller, TIC Turbo
Instrument Controller or TAG Controller and then use the funconality that they provide.
Alternavely, the logic interface can be connected to the customer control system.
For more informaon about the logic interface, refer to Logic interface connector on page 91.
USB interface
The USB service port is designed to work in conjuncon with Edwards nST PC soware. The
primary purpose of this interface is to allow easy conguraon of the nEXT85 pump.
Some operaonal capabilies are provided, including START/STOP to enable pump operaonal
checks to be made via the USB service port. However it is not intended as an industrial control
interface for unaended machine to machine (M2M) control.
The USB service port will support communicaons 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 congured while the pump is installed and running.
The USB service port should only be used when the 24 - 48 V d.c. power is applied. Use of the
USB service port without 24 - 48 V d.c. power risks corrupon of the pump controller memory.
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
exisng 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.
B8G0-00-880A - Overview of the nEXT85
Page 16

Edwards nEXT85 Specifications

General

Brand	Edwards
Model	nEXT85
Category	Water Pump
Language	English