Edwards NXDS6IC, NXDS6I, NXDS20IR, NXDS20I, NXDS15IR User Manual

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Instruction Manual

nXDS Serial Comms Interface

A735-01-860

Issue A Original

Description Item Number

nXDS6i A735-01-983 nXDS10i A736-01-983 nXDS15i A737-01-983 nXDS20i A738-01-983

nXDS6iC A735-02-983 nXDS10iC A736-02-983 nXDS15iC A737-02-983 nXDS20iC A738-02-983

nXDS6iR A735-03-983 nXDS10iR A736-03-983 nXDS15iR A737-03-983 nXDS20iR A738-03-983

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A735-01-860 Issue A

Section Page

1 Introduction ........................................................................................1

1.1 Scope of this manual.................................................................................................... 1

1.2 Description................................................................................................................ 1

2 Technical data .....................................................................................3

2.1 Logic interface........................................................................................................... 3

3 Connection for serial control and monitoring.................................................5

3.1 Serial connection ........................................................................................................ 5

3.2 Serial enable ............................................................................................................. 6

3.3 Serial protocol ........................................................................................................... 6

3.4 Message structure ....................................................................................................... 7

3.5 Command set............................................................................................................. 7

3.6 Operating the nXDS pump............................................................................................. 12

3.6.1 Start the pump.......................................................................................................... 12

3.6.2 Standby speed........................................................................................................... 12

3.6.3 Stop the pump .......................................................................................................... 12

3.7 Multi-drop operation................................................................................................... 13

3.7.1 Assigning a multi-drop address ....................................................................................... 14

3.8 Mixed parallel and serial operation.................................................................................. 15

3.9 Decoding status words................................................................................................. 16

3.9.1 Decoding system status word......................................................................................... 16

3.9.2 Decoding service status word......................................................................................... 19

Contents

For return of equipment, complete the HS Forms at the end of this manual.

gea/0207/06/12

A735-01-860 Issue A

Contents

Illustrations

Figure Page

1 Start / Stop Control Diagram ........................................................................................... 1

2 nXDS scroll pump ......................................................................................................... 2

3 Logic interface connections - RS232 serial control.................................................................. 5

4 Logic interface connections - RS485 serial control.................................................................. 6

5 RS485 multi-drop connections.........................................................................................13

6 Logic interface connection - mixed parallel and serial operation ...............................................15

Tables

Table Page

1 Logic interface connection pins........................................................................................ 3

2 Logic interface technical data.......................................................................................... 4

3 Summary of the commands that can be sent to the nXDS pump.................................................. 8

4 Command abbreviations................................................................................................11

5 Error codes ...............................................................................................................11

6 Hexadecimal conversion table.........................................................................................16

7 System status register 1 flags..........................................................................................17

8 System status register 2 flags..........................................................................................17

9 Warning register 2 flags ................................................................................................18

10 Fault register flags ......................................................................................................19

11 Service flags..............................................................................................................20

Associated publications

Publication title Publication number

Vacuum Pump and Vacuum System Safety P400-40-100 nXDS Scroll Pump Instruction Manual A735-01-880

Page ii © Edwards Limited 2012. All ri ghts reserved.

Edwards and the Edwards logo are trademarks of Edwards Limited.

A735-01-860 Issue A

1Introduction

1.1 Scope of this manual

This manual provides operational instructions for the Edwards nXDS pump serial communication protocol. Read this manual before you attempt to operate your nXDS pump using serial communica tion protocol.

For safety and operating information for the nXDS range of pumps, please refer to the nXDS Scroll Pump Instruction Manual (A735-01-880).

1.2 Description

The nXDS pump can be operated in four control modes:

 None in Control Mode - Inactive control mode  Manual Control Mode - Active control mode  Parallel Control Mode - Act ive control mode

Introduction

 Serial Control Mode (including Serial Interlock) - Active control mode

The control mode is determined by the way the nXDS pump is started. All the control mo des, and transitions between them, are defined in Figure 1.

Once started the nXDS pump can only be stopped by the mode in which it was started.

Figure 1 - Start / Stop Control Diagram

A735-01-860 Issue A

1. User interface panel

2. 15-way logic interface connection

Introduction

This instruction manual details the connection and operation of the nXDS pump in its serial control mode. The parallel, manual and none in control modes are detailed in the nXDS Scroll Pump Instruction Manual (A735-01-880).

The nXDS pump can be connected directly to the RS485 or RS232 serial input on your control equipment or a PC, using a suitable connector mating half (not supplied). Full serial control is realised by using the following two signa l lines: serial enable and RS232 / RS485 control inputs.

Figure 2 - nXDS scroll pump

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A735-01-860 Issue A

2Technical data

2.1 Logic interface

nXDS pumps have a male 15-way D-type logic interface connector located on the user interface panel (Figure 2, Item

2). The logic interface connector can be plugged directly into your control equipment or a PC using a suitable connector mating half (not supplied). Refer to Table 1 for the logic interface pins for the electrical connections and

Table 2 for the interface technical data.

Table 1 - Logic interface connection pins

Pin Number Signal Use

1 Analogue Speed Enable-control Input Connect to Pin 2 (0 V) to enable analogue speed control via

Pin 9.

2 0 V Control Reference 0 V reference for ALL control and status signals listed within

this table. 3 START / STOP – Control Input Connect to Pin 2 (0 V) to START the nXDS pump system. 4STANDBY – Control Input /

RS232 Rx / RS485 A5 Serial Enable – Control Input Connect to Pin 2 (0 V) to enable serial communications. 6 RS232 / RS485 – Control Input Default configuration is RS232 with Pin 6 unconnected.

7 FAIL – Status Output /

RS232 Tx / RS485 B+ 8 0 V Control Reference 0 V reference for ALL control and status signals listed within

9 Analogue Speed – Control Input 0-10 V Analogue Input: 0 V = 0% Speed; +10 V = 100% Speed

10 Chassis / Screen Screen 11 +10 V Analogue Reference – Control

Output

12 Chassis / Screen Screen 13 Not Connected Unused control pin. 14 REMOTE – Control Input Connect to Pin 2 (0 V) to enable remote operation via Parallel

15 NORMAL – Status output Logic LOW when the pump rotational speed is at normal

Connect to Pin 2 (0 V) to enable STANDBY speed when the SERIAL ENABLE control input is inac tive.

Connect to Pin 2 (0 V) to enable RS485 serial communications.

Logic HIGH when a fail / fault condition exists and the SERI AL ENABLE control input is inactive.

this table.

+10 V analogue voltage reference output: 5 mA; uni-polar output, diode protected.

control mode.

speed or above.

Technical data

A735-01-860 Issue A

Technical data

Table 2 - Logic interface technical data

Logic interface description

Connector Start, serial enable and remote enable:

Standby control input:

Analogue and RS485 enable control inputs:

Analogue speed input Speed set accuracy ± 5% full scale

NORMAL status output:

FAIL status output:

Analogue 10 V reference Voltage accuracy ± 2%

Output current ≤ 5 mA for specified accuracy

Mating half of connector not supplied

Enable control voltage: low (closed) 0 to 0.8 V d.c. (l Disable control voltage: high (open) 4 to 26.4 V d.c. (Internal pull up to 6.4 V nominal)

Enable control voltage: low (closed) 0 to 0.8 V d.c. (l Disable control voltage: high (open) 4 to 26.4 V d.c. (Internal pull up to 3.2 V nominal)

Enable control voltage: low (closed) 0 to 0.8 V d.c. (l Disable control voltage: high (open) 4 to 52.8 V d.c. (Internal pull up to 6.4 V nominal)

Type Open collector transistor plus pull up resistor. < Normal speed (default 80%) OFF (4.7 k pull up + diode to 12 V d.c.) ≥ Normal speed ON (< 0.8 V d.c. sinking 10 mA) Maximum current rating 10 mA Maximum voltage rating 28.8 V d.c.

Type Open collector transistor plus pull up resistor. Fail OFF (4.7 k pull up + diode to 12 V d.c.) OK ON (< 0.8 V d.c. sinking 10 mA) Maximum current rating 10 mA Maximum voltage rating 28.8 V d.c.

15-way D-type (male)

0 to 10 V d.c. directly proportional to the motor speed e.g. 0 V = 0 Hz, 10 V = 30 Hz

+ 10 V d.c. analogue voltage reference Unipolar output with diode protection

= 0.55 mA nominal)

OUT

= 0.3 mA nominal)

OUT

= 0.55 mA nominal)

OUT

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