Edwards nEXT200200 - Installation Procedures; Unpacking, Inspection, and Mounting

Logic interface item
Normal status output:
Type
Open collector transistor plus pull up resistor.
R
efer to Figure: Interface circuits for nEXT
turbo pump controllers on page 29.
< Normal speed (default 80%)
O (2.2 kW in
ternal pull up to 12 V d.c.)
³ Normal speed
On (< 0.8 V d.c. sinking 20 mA)
Current r
ang 20 mA to 0 V
Voltage rang 28.8 V d.c. maximum external pull up voltage
Fail status output:
Type
Open collector transistor plus pull up resistor.
Refer to Figure: Interface circuits for nEXT
turbo pump controllers on page 29.
Fail
O (3.3 kW pull up t
o 12 V d.c.)
OK
On (< 0.1 V d.c. sinking 1.7 mA,
< 0.8 V d.c. sinking 20 mA)
Current rang 20 mA to 0 V
Voltage rang 28.8 V d.c. maximum external pull up voltage
* Mang half of connector not supplied.
Table 9 Logic interface connector pins
Pin
Number
Signal Polarity Use
2 0 V Control reference -
0 V reference for all control and status
signals below.
3
START / STOP control
input
- Connect to Pin 2 to start pump
4
STANDBY control
input / Serial RX / RS485
A-
-
Connect to Pin 2 to enable standby
speed when serial enable is inacve
and RS485 / RS232 switch is in the
RS232 posion.
5 Serial enable -
Connect to Pin 2 to enable the serial
link
7
FAIL / Serial TX / RS485 B
+
-
Logic high when fail condion exists
and serial enable is inacve and
RS485 / RS232 switch is in the RS232
posion.
9 Analogue output Posive
0 ‑ 10 V output proporonal to
measured output
10 Chassis / Screen ‑ Screen
12 Chassis / Screen - -
15 NORMAL status output -
Logic low when the r
otaonal speed of
the pump is at normal speed or above
the normal speed
Page 28
B85200880_D - Technical data