Edwards nEXT400 User Manual

Figure 19 Logic interface connecon - mix
ed parallel and serial operaon
1. RS232 interface on control equipment 2. 24 V d.c. electrical supply
3. Fuse 4. Oponal LED indicat
or ‑ system OK
5. Oponal LED indicator ‑ normal speed 6. Current limit resistor for LED
7. Oponal serial link selector 8. pump
9. Oponal voltmeter 10. Oponal serial enable switch
11. Oponal standby switch 12. Start switch
1. RS232 interface on control equipment 2. 24 V d.c. electrical supply
3. Fuse 4. Oponal LED indicator ‑ system OK
5. Oponal LED indicator ‑ normal speed 6. Current limit resistor for LED
7. Oponal serial link selector 8. pump
9. Oponal voltmeter 10. Oponal serial enable switch
11. Oponal standby switch 12. Start switch
Note:
The volt
age supply to the pump controller can be more than 24 V. But the circuits
connected to the normal and fail line must have maximum external pull‑up voltage
rang as given in Table: Logic interface technical data.
4.9 Vent opons, vent valve connecon and control
CAUTION: RATE OF INCREASE IN PRESSURE
Risk of damage t
o equipment. If you vent the pump when it is at full rotaonal speed
and the rate of increase in pressure is too high, the pump can get damaged and its life
can decrease. We recommend to limit the rate of increase in pressure (refer to Figure:
Maximum allowed rate of increase in pressure during venng: pressure against me
(pump inially at full speed)) or open the vent valve only aer the pump speed has
decreased to 50% of the full rotaonal speed.
04/2022 - ©Edwards Limited
Page 57B80000880_G
B80000880_G - Inst
allaon

Edwards nEXT400 Specifications

General

Brand	Edwards
Model	nEXT400
Category	Water Pump
Language	English