Edwards nEXT 55, Instruction Manual

Page: 15 / 116

The electronic braking option can be enabled to decrease the pump deceleration time
and to recover some energy from the pump. This can be done by returning the power
from the pump to the electrical supply. The rate at which the electrical energy is
returned to the supply is regulated to the voltages shown:
Voltage range Returned electronic braking voltage
Below 21.6 V d.c. (24 V d.c. -10%) Outside working range for pump
21.6 V d.c. to 26.4 V d.c. 24 V d.c. +10%
26.4 V d.c. to 38.4 V d.c. Electronic braking not functional
38.4 V d.c. to 50.4 V d.c. 48 V d.c. +10%
Above 50.4 V d.c. (48 V d.c. +5%) Outside working range for pump
To get the fastest electronic braking times, the returned power must go to somewhere,
such as:
▪ A supply capable to receive the returned power.
▪ Other devices that share the same electrical supply bus with the pump.
▪ An applicable 2 A load during the deceleration of the pump.
2.5 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 49.
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 26 for more information about the logic
interface.
2.5.1 USB interface
The USB service port is designed to work with manufacturer's nST PC software. The
primary function of the interface is to allow an easy configuration of the pump.
The START / STOP option is given to check the pump operation through the USB service
port. It is not intended as an industrial control interface for unattended machine to
machine (M2M) control.
The USB service port supports the same time communications with the serial interface
in the logic interface connector. This enables the review of the pump status and logs,
and you can configure the pump while the pump is installed and in operation.
07/2021 - ©Edwards Limited Page 15 B8G000880_E
B8G000880_E - Introduction