Edwards nXDS15i User Manual

5.4.1 Hardware c
onguraon
Using the 15‑way D‑type connector (Figure: nXDS scroll pump on page 11, item 7) apply
the following signal conguraons to enable the Analogue Speed Control source (refer
to Table: Logic interface connector pins on page 22):
Connect the Analogue Speed Enable control input (pin 1) to the 0 V Control Reference
(pin 2).
Connect a suitably calibrated analogue voltage source (0 to + 10 V), for example, (DAC)
to the analogue speed control input (pin 9). Alternavely connect the output of a
potenometer referenced to the pump reference voltage (pin 11) to the analogue speed
control input (pin 9). Refer to Figure: Logic interface connecons - analogue speed
control on page 34. The 0 V rail of the external voltage source must be connected to the
0 V Control Reference (pin 2) of the pump controller.
5.4.2 Operaon
▪ A + 10 V input equates to a mechanical running speed which is equal to: 100% of
the default run speed, that is, 30 Hz.
▪ The minimum running speed provided by the Analogue Speed control source, is
clamped at the minimum Standby Speed Seng, that is, approximately 67% of the
default run speed of 20 Hz.
▪ The maximum running speed provided by the Analogue Speed control source is
clamped b
y the maximum Standby Speed Seng, that is, 100% of the default run
speed of 30 Hz.
5.5 Auto-run
The auto‑run seng congures the pump to start at power‑up without any customer
intervenon. This parameter is customer congurable via serial communicaons or using
the START / STOP buons. Holding down either the START or STOP buon, for more than
eight seconds, will enable or disable the auto‑run seng. The status of the auto‑run
seng is visible via the auto‑run LED.
The pump can be stopped using either manual, parallel or serial control modes whilst in
auto‑run.
5.6 Use of gas ballast control
The gas ballast control can be used to opmise the performance of the scroll pump for
the applicaon. The performance characteriscs of the pump with gas ballast on are
shown in Performance characteriscs on page 16. The posion of the gas ballast control
can be changed when the pump is either o or operang.
5.6.1 Gas ballast control
Use the gas ballast control to introduce air into the nal stage of the pump. Use of gas
ballast will reduce the condensaon of vapours in the pump. The condensates would
contaminate the pump.
There are only two posions, 0 and 1. The gas ballast control knob will rotate 360° in
either direcon at 90° intervals.
Page 35
A73501880_G - Operaon

Edwards nXDS15i Specifications

General

Brand	Edwards
Model	nXDS15i
Category	Water Pump
Language	English