Bearing Monitoring; Logic Interface - Edwards nEXT730D Instruction Manual

connected to the pump via the nEXT pump power supply cable when accelerating and
running.
Whilst decelerating the pump will coast down and no power will be returned to the
electrical supply.
The electronic braking option may be enabled to reduce the pump deceleration time
and to recover some energy from the pump. This is only achieved by returning power
from the pump to the electrical supply through the nEXT pump power supply cable. The
rate at which electrical energy is returned to the supply is regulated to the voltages
shown:
Voltage range
Below 43.2V dc. (48V dc. –10%)
43.2V dc. to 50.4V dc.
Above 50.4V dc. (48V dc. +5%)
In order to achieve the fastest electronic braking times there must be somewhere for the
returned power to go, such as:
▪ A supply capable of receiving the returned power
▪ Other devices sharing the same electrical supply bus with the pump
▪ A suitable 3 A load when decelerating the pump

3.3.8 Bearing monitoring

In order to ensure maximum reliability and bearing life the nEXT pumps have an
integrated system to manage the bearing condition, refer to
conditioning system
time clock that is constantly monitoring pump storage time.
If the pump is stored without being run for more than 12 months
on page 107" (BRIM) is triggered the next time the pump is started to condition the
bearing. Bearing run in mode (BRIM) is a start-up sequence for the pump designed to
precondition the bearing to optimise bearing life. The pump goes through a number of
speed steps before reaching full speed.

3.4 Logic interface

The motor controller can only be operated through the logic interface. There are three
types of signals on the logic interface.
▪ Control inputs: these are switch‑type signals that are used to control the pump
▪ Status outputs: these outputs identify 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, operating through one connector. For serial control either RS232 (default) or
RS485 can be selected using the RS485/CAN/RS232 slide switch located on the motor
controller (refer to
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
B8J200880_D
300812671_002_C3
B8J200880_D - Overview
on page 106. The pumps have an integrated battery backed real
Connection for serial control and monitoring
Page 18
Returned electronic braking voltage
Outside working range for pump
48 V d.c. + 10%
Outside working range for pump
Bearing monitoring and
"Bearing Run in Mode
on page 59).
08/2021 - ©Edwards Limited