Edwards nEXT730D User Manual

The reply will be in the following format, where the rs
t returned number refers to
motor rotaonal speed in revoluons per second (Hz):
Reply
= v 8 5 2 sp d d d d ; h h h h h h h h cr
Note:
The second re
turn number is a 32-bit system status word (set of 8 hexadecimal
characters) which is useful for fault nding. Refer to Fault nding on page 96.
7.5 Mixed parallel and serial operaon
In mixed parallel and serial operaon the pump may receive commands from both serial
and parallel interfaces.
To understand how these commands control the pump, refer to Figure: Logic interface
connecon - mixed parallel and serial operaon. The pump will power up with ‘None in
Control’. From this state a parallel start signal or a serial start command may be received,
resulng in the pump moving to parallel control mode or serial control mode
respecvely. Serial start commands will only be received if the serial enable line is acve.
The state of the serial enable line may be switched between acve and inacve whilst in
mixed parallel and serial operaon. The primary funcon of the serial enable line is to
enable the serial link. It has no direct eect on the control mode. The pump will receive
and respond to serial commands whenever the serial enable line is acve, and
conversely will not receive or respond to serial commands when the serial enable line is
inacve.
Availability of the parallel standby and fail signals depends on the state of the serial
enable line and the posion of the RS485/CAN/RS232 switch as described in Table: Serial
enable matrix.
Table 21
Serial enable matrix
Switch Serial enable acve Serial enable inacve
R
S232
Standby and fail lines are used for
RS232 data.
Standby and fail lines are used for par-
allel Standby control and fail indica-
on.
Parallel standby control and fail indi-
caon are disabled.
Serial communicaons are disabled.
RS485
Standby and fail lines are used for
RS485 data.
Standby and fail lines are in (RS485)
high impedance state.
*
Parallel standby control and fail indi-
caon ar
e disabled.
Serial communicaons are disabled.
* Pump target speed will switch between run speed and standby speed in response to
any data driven onto the RS485 bus by other devices connected to the bus. Acvaon of
the parallel start line not recommended with the RS485/CAN/RS232 switch in RS485
posion and serial enable Inacve. Deacvaon of the serial enable line is not
recommended with the pump running following a start from the parallel start line when
the RS485/CAN/RS232 switch is in the RS485 posion.
In parallel control mode, the pump will not accept serial stop commands but will accept
all other serial commands. When serial enable is acve, the pump will run at standby
08/2021 - ©Edwards Limited
Page 83B8J200880_D
300812671_002_C3
B8J200880_D - Operaon

Edwards nEXT730D Specifications

General

Brand	Edwards
Model	nEXT730D
Category	Water Pump
Language	English