EDWARDS nXDS6i Oil-Free Dry Scroll Vacuum Pump Instruction Manual

EDWARDS nXDS6i Oil-Free Dry Scroll Vacuum Pump

Product Information

Product Usage Instructions

Introduction
The nXDS Serial Comms Interface is available in multiple models: nXDS6i, nXDS10i, nXDS15i, and nXDS20i. Each model is available in two variants: C and R.

Scope of this Manual
This manual provides information on the usage and technical specifications of the nXDS Serial Comms Interface.

Description
The nXDS Serial Comms Interface is a communication module designed for use with the nXDS scroll pump. It allows for serial control and monitoring of the pump.

Technical Data
The technical data for the nXDS Serial Comms Interface includes information on its logic interface and connection for serial control and monitoring.

Logic Interface
The logic interface of the nXDS Serial Comms Interface allows for communication via RS232 or RS485 serial control.

Connection for Serial Control and Monitoring
The nXDS Serial Comms Interface provides connections for serial control and monitoring of the pump. The specific connections vary depending on the chosen model and variant. Please refer to the illustrations provided in the user manual for detailed information on the connection configurations.

Return of Equipment
If you need to return the equipment, please complete the HS Forms at the end of this manual.

Introduction

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 communication protocol.

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

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 – Active control mode
• 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 modes, 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.

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 signal lines: serial enable and RS232 / RS485 control inputs.

Technical data

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

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.
4| STANDBY – Control Input / RS232 Rx / RS485 A-| Connect to Pin 2 (0 V) to enable STANDBY speed when the SERIAL ENABLE control input is inactive.
5| 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. Connect to Pin 2 (0 V) to enable RS485 serial communications.
7| FAIL – Status Output / RS232 Tx / RS485 B+| Logic HIGH when a fail / fault condition exists and the SERIAL ENABLE control input is inactive.
8| 0 V Control Reference| 0 V reference for ALL control and status signals listed within this table.
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| +10 V analogue voltage reference output: 5 mA; uni-polar output, diode protected.
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 control mode.
15| NORMAL – Status output| Logic LOW when the pump rotational speed is at normal speed or above.

Table 2  Logic interface technical data

Logic interface description|
---|---
Connector*| 15-way D-type (male)
Start, serial enable and remote enable: Enable control voltage: low (closed)

Disable control voltage: high (open)

| ****

0 to 0.8 V d.c. (lOUT = 0.55 mA nominal)

4 to 26.4 V d.c. (Internal pull up to 6.4 V nominal)

Standby control input:

Enable control voltage: low (closed) Disable control voltage: high (open)

| ****

0 to 0.8 V d.c. (lOUT = 0.3 mA nominal)

4 to 26.4 V d.c. (Internal pull up to 3.2 V nominal)

Analogue and RS485 enable control inputs: Enable control voltage: low (closed)

Disable control voltage: high (open)

| ****

0 to 0.8 V d.c. (lOUT = 0.55 mA nominal)

4 to 52.8 V d.c. (Internal pull up to 6.4 V nominal)

Analogue speed input

Speed set accuracy

| 0 to 10 V d.c. directly proportional to the motor speed

e.g. 0 V = 0 Hz, 10 V = 30 Hz

± 5% full scale

NORMAL status output:

Type

< Normal speed (default 80%)

³ Normal speed Maximum current rating

Maximum voltage rating

| ****

Open collector transistor plus pull up resistor. OFF (4.7 k pull up + diode to 12 V d.c.)

ON (< 0.8 V d.c. sinking 10 mA) 10 mA

28.8 V d.c.

FAIL status output: Type

Fail OK

Maximum current rating

Maximum voltage rating

| ****

Open collector transistor plus pull up resistor. OFF (4.7 k pull up + diode to 12 V d.c.)

ON (< 0.8 V d.c. sinking 10 mA) 10 mA

28.8 V d.c.

Analogue 10 V reference

Voltage accuracy Output current

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

± 2%

£ 5 mA for specified accuracy

Connection for serial control and monitoring
The serial interface allows you to control the nXDS pump and to interrogate its operational status using a number of serial commands. There is also a multi-drop mode that allows you to connect more than one nXDS pump to a single serial port on your control system.

Serial connection
The nXDS pump can connect directly to the RS485 or RS232 serial input on your control equipment or a PC as shown in Figure 3 and 4. In this configuration the PC is the serial link master and the nXDS pump is the slave. The RS232 serial link is capable of operating reliably at distances up to 6m. The RS485 serial link is recommended to maintain reliable serial communications at distances greater than 6m. Alternatively an interface circuit, external to the nXDS pump, may be required to communicate using the RS232 serial link over longer distances. The software in the nXDS pump is capable of operating with several pumps connected to a single serial link master. This is referred to as multi-drop mode (refer to Section 3.7). The RS485 option is recommended for multi-drop mode. To enable the RS485 option, link the RS485 input signal to the 0 V Control Reference (pin 6 to pin 2) of your logic interface mating half.

Serial enable
To send a serial message you must first activate serial enable. This is achieved by linking the serial enable input signal (pin 5) to pin 2 of your logic interface mating half. We recommend that you incorporate this link into your serial communications cable so that the serial enable is only activated when the serial cable is connected. When you subsequently remove the cable, serial enable will become inactive. Serial enable acts as an interlock for start commands sent over the serial interface. If the nXDS pump is running in serial control mode (having been sent a serial start command) and the serial enable subsequently becomes inactive, the nXDS pump will trigger a fail condition and will decelerate to rest. To clear this fail condition, you must reactivate the serial enable and send a serial stop command.

Serial protocol
The serial interface link is set to 9600 Baud, 8 bits, 1 stop, no parity with no handshaking. The commands are made up from printable ASCII characters. The maximum message size you can send is 80 characters, including start and end characters.

All alphabetical characters must be sent in upper case format. Response may contain lower case characters. Every complete command message you send will receive a response – either a status code or a data return. The nXDS pump can only deal with one message at a time. It will only accept a new message once the response to the previous message has been returned.

If the nXDS pump receives characters that are not framed inside start and stop characters, it will ignore them. Messages with the stop character missing will be discarded with no response when a new start character is received.If the nXDS pump receives an unrecognisable message between the start and stop characters, it will return an appropriate error message.

Message structure
The message structure and command set are the same for RS485 and RS232 options. To communicate a message to the nXDS pump you must send the characters in a specific order. If the message does not conform to the correct structure it will be ignored and no reply will be sent.

There are two basic types of message sent to the nXDS pump:

• A command sending information to the nXDS pump; this is prefixed with a ‘!’ character
• A query requesting information from the nXDS pump; this is prefixed with a ‘?’ character

Data is stored and accessed via two memory types within the nXDS Pump:

• Non-volatile memory – this provides access to persistent data which is restored after power-cycling; the the prefix ‘S’ indicates persistent data.
• Volatile memory – this provides access to non-persistent data which is NOT restored after power-cycling; the prefixes ‘C’ and ‘V’ indicate non-persistent data.

The correct structure to use is as follows:

• a valid start character, either a ‘!’ character for a store operation or a ‘?’ character for a query operation, followed by
• a command, which will be an upper case alphabetical character, followed by
• an object number, comprising three decimal digits, followed by
• for some commands only, a data field, comprising a sequence of characters separated from the object number by a space, followed by
• a terminating carriage return, as the stop character

An extended message protocol is used in multi-drop mode, refer to Section 3.7.

Command set
Table 3 shows a summary of the full set of commands available for controlling and monitoring the nXDS pump.

Table 4 shows the abbreviations that are used to define commands in the following sections and Table 5 shows the error codes that might be returned.

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

Object name| Command| Parameter range| Factory setting| Data type| Units| Comments
---|---|---|---|---|---|---

Identification

| ****

?S0

| ****

–

| ****

–

| ****

–

| ****

–

| Acts as wildcard object num- ber to identify

instrument.

Reply identical to ?S801

Node| ?S800

!S800

| 0..98| 0| Decimal| Slave Address| Multi-drop address (RS485)

0 = disable multi-drop mode;

Pump type

| ****

?S801

| [1..8]| –| String| ASCII

Characters

| Pump type (nXDS)

[1..11]| ****

–

| ****

String

| ****

ASCII

Characters

| Motor-Control Software Version number (Dxxxxxxxx Y) (where Dxxxxxxxx is the drawing number and Y is the revision)

1..255

| ****

–

| ****

String

| ****

Hz

| Design frequency (= Nominal mechanical frequency of the pump)

Pump control

| ****

!C802

| 0| –| Decimal| ****

–

| Stop the pump
1| –| Decimal| Start the pump

?V802

| 0..255| –| Decimal| Hz| Reported motor frequency
64-bits encoded as four

16-bit words:

<0000..FFFF>;

<0000..FFFF>;

<0000..FFFF>;

<0000..FFFF>

| ****

–

| ****

Hexadeci- mal

| ****

–

| ****

System status:

System status register 1; System status register 2; Warning register and Fault register*

Speed control

| ****

!C803

| 0| –| Decimal| ****

–

| Use full speed
1| –| Decimal| Use standby speed

Normal speed threshold

| ****

?S804

!S804

| ****

50..100

| ****

80

| ****

Decimal

| ****

%

| Normal speed status output trigger level:

Percentage (%) of selected speed

Standby speed setting

| ****

?S805

!S805

| ****

66..100

| ****

70

| ****

Decimal

| ****

%

| Standby speed of pump: Percentage (%) of full mechanical speed (see 801)

!S stores standby speed to non-volatile memory

(use !C805 for real-time speed control, faster execution and extended non- volatile memory life)

!C805| !C retains value in volatile memory only

Auto-run

| ****

?S806

!S806

| ****

0

1

| ****

0

| ****

Decimal

| ****

–

| Run the nXDS Pump-System from power-on:

Enable = 1

Disable = 0

Object name| Command| Parameter range| Factory setting| Data type| Units| Comments
---|---|---|---|---|---|---

Temperature readings

| ****

?V808

| 0..150| –| Decimal| °C| Measured pump temperature†
0..150| –| Decimal| °C| Measured pump-controller temperature†

Link parameter readings

| ****

?V809

| 0..5000| –| Decimal| 0.1V| Measured link voltage
±0..300| –| Decimal| 0.1A| Measured motor current
±0..15000| –| Decimal| 0.1W| Measured motor power
Run hours| ?V810| 0..99999

~11 years

| –| Decimal| Hours| Total run hours – time pump has run
Pump cycles| ?V811| 0..99999| –| Decimal| Cycles| Total number of start/stop cycles

Drive run time

| ****

?V813

| 0..99999

~11 years

| –| Decimal| Hours| Total run hours – time pump- controller has run
0..99999

~11 years

| –| Decimal| Hours| Hours until recommended controller replacement
Time run since last tip seal service| ****

?V814

| 0..99999

~11 years

| ****

–

| ****

Decimal

| ****

Hours

| Number of pump running hours since last tip seal service
Run time to tip seal service indicator| ****

0..99999

~11 years

| ****

–

| ****

Decimal

| ****

Hours

| Number of pump running hours left until tip seal service due. Decreases until due at zero

Service indicator reset

| ****

!C814

| ****

1

| ****

–

| ****

Decimal

| ****

–

| Command to reset service indicators, ‘time since’ to zero and ‘time to’ to service interval
Time run since last bearing service| ****

?V815

| 0..99999

~11 years

| ****

–

| ****

Decimal

| ****

Hours

| Number of pump running hours since last bearing service
Run time to bearing service indicator| ****

0..99999

~11 years

| ****

–

| ****

Decimal

| ****

Hours

| Number of pump running hours left until bearing service due. Decreases until due at zero

Bearing service indicator reset

| ****

!C815

| ****

1

| ****

–

| ****

Decimal

| ****

–

| Command to reset service indicators, ‘time since’ to zero and ‘time to’ to service interval

Fault history 1

| ****

?V816

| 0..99999

64-bits encoded as four 16-bit words:

<0000..FFFF>;

<0000..FFFF>;

<0000..FFFF>;

<0000..FFFF>

| ****

–

| ****

Decimal Hexidecimal

| ****

Hours

–

| Fault history at last trip:

nXDS pump-controller powered time (hours) system status register 01; system status register 02;

warning register 01 and fault register 01*

Object name| Command| Parameter range| Factory setting| Data type| Units| Comments
---|---|---|---|---|---|---

Fault history 2

| ****

?V817

| 0..99999

64-bits encoded as four 16-bit words:

<0000..FFFF>;

<0000..FFFF>;

<0000..FFFF>;

<0000..FFFF>

| ****

–

| ****

Decimal Hexidecimal

| ****

Hours

–

| Fault history at 2nd last trip:

nXDS pump-controller powered time (hours) system status register 01; system status register 02; warning register 01 and fault

register 01*

Fault history 3

| ****

?V818

| 0..99999

64-bits encoded as four 16-bit words:

<0000..FFFF>;

<0000..FFFF>;

<0000..FFFF>;

<0000..FFFF>

| ****

–

| ****

Decimal Hexidecimal

| ****

Hours

–

| Fault history at 3rd last trip:

nXDS pump-controller powered time (hours) system status register 01; system status register 02; warning register 01 and fault

register 01*

Fault history 4

| ****

?V819

| 0..99999

64-bits encoded as four 16-bit words:

<0000..FFFF>;

<0000..FFFF>;

<0000..FFFF>;

<0000..FFFF>

| ****

–

| ****

Decimal Hexidecimal

| ****

Hours

–

| Fault history at 4th last trip:

nXDS pump-controller powered time (hours) system status register 01; system status register 02; warning register 01 and fault

register 01*

Customer interface software version

| ****

?S820

| ****

[1..11]| ****

–

| ****

String

| ****

ASCII

Characters

| Customer interface software version number (Dxxxxxxxx Y) (where Dxxxxxxxx is the drawing number and Y is the revision)
Factory settings| ****

!C821

| ****

1

| ****

–

| ****

Decimal

| ****

–

| Reset all configuration options and parameters to factory settings

Motor-control boot-loader version

| ****

?S822

| ****

[1..11]| ****

–

| ****

String

| ****

ASCII

Characters

| Motor-control boot-loader version number (Dxxxxxxxx Y)

(where Dxxxxxxxx is the drawing number and Y is the revision)

Customer interface boot-loader version

| ****

?S823

| ****

1..11]

| ****

–

| ****

String

| ****

ASCII

Characters

| Customer interface boot- loader version number (Dxxxxxxxx Y)

(where Dxxxxxxxx is the drawing number and

Y is the revision)

Object name| Command| Parameter range| Factory setting| Data type| Units| Comments
---|---|---|---|---|---|---

Service setting

| ****

!S825

?S825

| ****

0..3

| ****

0

| ****

Decimal

| ****

–

| 0: Service indication on Service LED

1: Service indication on Service LED and FAIL line 2: No service indication on Service LED or FAIL line

3: Service indication on FAIL line

Service status

| ****

?V826

| One 16-bit word:

<0000..FFFF>

| ****

–

| ****

Hexidecimal

| ****

–

| Service status word – Contact Edwards for more information‡

Service

| ****

?S835

| ****

[1..30]| ****

–

| ****

String

| ****

ASCII

Characters

| Serial numbers:

pump; drive-module and power/control PCA (fixed at manufacture, 9 characters each)

[1..36]| –| String| ASCII

Characters

| Pump type and build

See Section 3.9.1 for status word decoding

If either returned value is ‘-200’, then this means that this temperature is not utilised within the product

See Section 3.9.2 for service word decoding

Table 4 Command abbreviations

cr chars d

h r sp string X

| carriage return character characters

decimal ASCII character

Note: __Fields showing multiple d characters are to indicate typical length. All data fields have a maximum of 5 decimal characters (prefixed by a minus number for negative numbers).

hexadecimal ASCII character Returned error code – refer to Table 5 space character

may have several ASCII characters Multi-drop decimal ASCII character

Note: __Fields showing multiple X characters are to indicate maximum length and not fixed length.

Table 5 Error codes

in par-
5| allel control mode

Operating the nXDS pump

Start the pump
To start the pump, send the following command over the serial communications link:

The reply you receive will be in the following format:

The pump will then accelerate up to the target speed and the green run LED will flash whilst it is doing so. When the pump reaches its target speed, the green run LED will remain illuminated.

Standby speed
To run the nXDS pump at standby speed, send the following command over the serial communications link:

The reply you receive will be as follows:

If the pump is currently below standby speed then it will accelerate until it reaches standby speed. If it is running faster than standby speed, it will decelerate until standby speed is reached.

To return the pump to full speed, send the following command:

The reply you receive will be as follows:

Stop the pump
To stop the nXDS pump, send the following command over the serial communications link:

The reply you receive will be in the following format:

On successful receipt of the stop command, the pump will decelerate to rest.

Multi-drop operation
Using multi-drop mode, a single computer system can communicate with more than one nXDS pump. Each nXDS pump must be assigned its own individual address, or node, before it can be fitted into a multi-drop system. The command to assign the multi-drop address is sent in standard nXDS message format and is detailed in Section 3.7.1 below. The message protocol in multi-drop mode is marginally different to that described for serial messages in single pump systems (Section 3.4). The main differences in multi-drop message protocol are detailed below:

• All multi-drop commands, queries or replies have the start character #.
• All multi-drop commands, queries and replies include a header, which contains the address of the node that the message is to, followed by the address of the node that the message is from.
• There is a delimiter character ‘:’ (colon) which separates the two multi-drop addresses in the header.
• The remainder of the message (command, query or reply) follows the same protocol as already described for single pump systems.
• The wild card address 99 means ‘any’ node.

After a nXDS pump has been assigned a multi-drop address, it will ignore any messages in the format for single pumps. An individual nXDS pump will remain silent and ignore all command messages unless the multi-drop address matches its own address.

Figure 5 shows a schematic diagram of an example multi-drop connection system, which can be expanded to accommodate multiple pumps.

Assigning a multi-drop address
When you receive your nXDS pump it will have multi-drop mode disabled by default. Each individual pump must be programmed with its own multi-drop address, via a point-to-point connection, before introduction into a multi- drop network.

Send the following command to assign a multi-drop address (where the ‘d’ characters represent the address):

Note : The address can be any decimal number from 1 to 98. The address number 0 is used to disable multi-drop mode. The address number 99 is reserved as a wild card and is used in the query set up detailed later.

The reply you receive will be as follows:

The multi-drop address is stored within the nXDS pump.

You can also send a query to the pump to find out whether it already has a multi-drop address. Send the following command:

If you receive the reply shown below, your pump has multi-drop mode disabled :

If your pump already has a multi-drop address you will receive no reply and you must then communicate with your pump in multi-drop message protocol.

Use the following query (using wild card address 99 which means ‘any’ node) to find out the multi-drop address of the nXDS pump:

The reply you receive will be as follows, where dd denotes the multi-drop address of the pump:

You can disable multi-drop mode by assigning the pump an address 0. To do this, send the following command (where dd denotes the multi-drop address of the pump and xx denotes the address of the node that is sending the command):

The reply you receive will be as follows:

Once multi-drop mode is disabled, the pump will no longer respond to multi- drop commands.

Mixed parallel and serial operation
You can control the nXDS pump using the parallel interface control inputs and at the same time monitor various pump parameters using the serial interface. Alternatively you can control the nXDS pump using commands sent over the serial interface and at the same time monitor the normal signal using the parallel interface. Figure 6 shows a schematic diagram of an example mixed operation system that would allow you to do this. Many of the individual functions available in either parallel or serial operations are also available in mixed parallel and serial operation; but note that whilst serial enable is active, the parallel standby and fail signals are not available.

The following functions can also be used in conjunction with mixed parallel and serial operation:

• Multi-drop operation; described in Section 3.7.
• Analogue speed control; described in the nXDS Scroll Pump Instruction Manual (A735-01-880)

For more information on the parallel control and monitoring, please refer to the nXDS Scroll Pump Instruction Manual (A735-01-880).

You cannot control the nXDS pump using both the parallel and serial interfaces simultaneously. For example, if you start the pump by sending a start command over the serial interface, you cannot stop the pump by using the parallel interface; you must stop the pump by sending a stop command over the serial interface. Similarly, if you start the pump by using the start / stop switch on the parallel interface, you cannot then stop the pump by using the serial interface; you must stop the pump by using the start / stop switch on the parallel interface.

Decoding status words

Decoding system status word
If you are using the serial communications link you will be able to access further information that may be useful for fault finding. When you send a query to monitor measured motor speed, the pump also returns a system status word.

The send command is as follows:

You will receive the following reply, where the first returned number refers to motor rotational speed in revolutions per second (Hz):

The system status word returned is made up of 4 separate status words, each made up of 4 hexadecimal digits and are separated by a semi-colon ‘;’. The first status word is ‘System status register 1’, then ‘System status register 2’, then ‘Warning register’ and the final status word is ‘Fault register’. To decode each individual status word, you must convert each hexadecimal digit into a 4-digit binary number. (Table 6 is provided as an aid.) Follow the example below:

Table 6 Hexadecimal conversion table

Each binary digit (bit) represents a flag that is either active (state 1) or not active (state 0). To help decode each of the system status words, each bit is numbered (starting with 0 for the least significant to 15 for the most significant), as shown below:

Table 7 System status register 1 flag

deceleration/ ramp down process
1| Acceleration/running| Accelerating or running
2| Standby speed| Standby active
3| Normal speed| Above normal speed
4| Above ramp speed| Operating above the ramp speed threshold
5| Above overload speed| Operating above the overload speed threshold
6| Control mode| Bits 6, 7 and 13 indicate which control mode the pump- controller is operating in (bit 13; bit 7; bit 6).

000=none; 001=serial; 010=parallel; 011=manual 100…111=reserved

7
8| Reserved| –
9| Reserved| –
10| Serial enable| Serial enable active
11| Reserved| –
12| Reserved| –
13| Control mode| Used in conjunction with bits 6 and 7 above
14| Reserved| –
15 (msb)| Reserved| –

The following 4 tables each contain a list of the 16 status flags that will be used for decoding the status or fault finding for the nXDS pump. Table 7 contains the 16 flags used to decode the ‘System status register 1’, Table 8 contains the 16 flags used to decode the ‘System status register 2’, Table 9 contains the 16 flags used to decode the ‘Warning register’ and Table 10 contains the 16 flags used to decode the ‘Fault register’.

Table 8  System status register 2 flags

operating on power limit
1| Lower power regulator active| Acceleration is limited to manage link voltage
2| Upper voltage regulator active| Deceleration is limited to manage link voltage
3| Reserved| –
4| Service due| Service is due – See hours counters to identify what needs replacing or use command ?V826
5| Reserved| –
6| Warning| Warning condition – See ‘Warning register’ for detail
7| Alarm| Fault condition – See ‘Fault register’ for detail
Bit| Status Flag| Active Flat Meas
---|---|---
8| Reserved| –
9| Reserved| –
10| Reserved| –
11| Reserved| –
12| Reserved| –
13| Reserved| –
14| Reserved| –
15 (msb)| Reserved| –

Table 9 Warning register 2 flags

minimum measurable value
2| Reserved| –
3| Reserved| –
4| Reserved| –
5| Reserved| –
6| Pump-controller temperature regulator active| Output current is being restricted due to high pump-controller temperature
7| Reserved| –
8| Reserved| –
9| Reserved| –
10| High pump-controller temperature| Pump-controller temperature is above the maximum measurable value
11| Reserved| –
12| Reserved| –
13| Reserved| –
14| Reserved| –
15 (msb)| Self test warning| Non-critical problem with EEPROM or other internal function

Table 10 Fault register flags

incomplete)
10| Reserved| –
11| No parameter set| Parameter set upload required
12| Self test fault| Self test fault (e.g. Invalid software code)
13| Serial control mode interlock| Fault because the serial enable input went inactive whilst operating with a serial start command
14| Overload time out| Fault because the output frequency fell below the threshold for more than the allowable time (with an active start command)
15 (msb)| Acceleration time out| Fault because the output frequency did not reach the threshold in the allowable time (following a start command)

Decoding service status word
The service status may be accessed directly via the serial link. This method of accessing service status will give the most complete picture of current and future service requirements and will allow preventative maintenance activities to be scheduled.

A summary of the current pending service status is provided in response to the service status command:

You will receive the following reply:

The service status word is made up of 4 hexadecimal digits. To decode this word, you must convert each hexadecimal digit into a 4-digit binary number as described in Section 3.9.1. Each binary digit (bit) represents a flag that is either active (state 1) or not active (state 0). To help decode the service status word, each bit is numbered (starting with 0 for the least significant to 15 for the most significant) as shown in Section 3.9.1. The meaning of each bit in the service status word is given in Table 11.

Table 11 Service flags

when hours until bearing service due = 0

–

Set when hours until controller service due = 0

–

–

–

Service is due. Specific operation required should be determined by checking the bits above

–

1| Bearing service due
2| Reserved

3

| ****

Controller service due

4| Reserved
5| Reserved
6| Reserved
7| Service due

8 – 15

| ****

Reserved

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Edwards and the Edwards logo are trademarks of Edwards Limited.

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