BEKA BA314E, BA314G User Manual

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Page 1

Issue: 1

February 2017

BA314G and BA314E

Intrinsically safe

Tachometers

Issue 1

Page 2

1. Description

2. Operation

2.1 Initialisation

2.2 Controls

2.3 Displays

3. Intrinsic Safety Certification

3.1 ATEX gas certification

3.2 Zones, gas groups & T rating

3.3 Power supply

3.4 Pulse input terminals

3.4.1 sensors that do not require energising.

3.4.2 sensors that require energising

3.5 Remote reset terminals

3.6 Certification label information

4. System Design for Hazardous Areas

4.1 Use with Zener barriers

4.1.1 Power supply

4.1.2 Pulse input

4.1.3 Switch contact input

4.1.4 Open Collector input

4.1.5 2-wire proximity detector input

4.1.6 Magnetic pick-off input

4.1.7 Voltage pulse input

4.1.8 Remote reset

4.2 Use with galvanic isolators

4.2.1 Power supply

4.2.2 Pulse input

4.2.3 Switch contact input

4.2.4 Open collector

4.2.5 2-wire proximity detector input

4.2.6 Magnetic pick-off input

4.2.7 Voltage pulse input

4.2.8 Remote reset

5. Installation

5.1 Location

5.2 Installation procedure

5.3 EMC

5.4 Units of measurement and tag marking on scale card.

6. Configuration and Calibration

6.1 Calibration structure

6.2 Accessing configuration functions

6.3 Summary of configuration functions

6.4 Input: inPut

6.5 Input type: inP

. tYPE

6.6 Debounce: dEbouncE

6.7 Display update interval: uPdAtE

6.8 Run-time display: di5P-2

6.9 Position of the decimal points: dP

6.10 Speed scale factor: 5CALE

. 5

6.11 Timebase: t-bA5E

6.12 Display filter: FiLtEr

6.13 Clip-off: CLP oFF

6.14 Local reset: LoC clr

6.15 Local run-time reset: clr tot

6.16 Local grand total run-time reset: clr gtot

6.17 Grand total run-time reset from within the configuration menu: Clr

. Gtot

6.18 Security code: CodE

6.19 Reset configuration to factory defaults:

r5Et def

6.20 Pulse output

6.20.1 Intrinsic safety

6.20.2 System designing

6.20.3 Configuration

6.20.4 Access Pulse output sub-menu

6.20.5 Enable pulse output

6.20.6 Source of output pulse

6.20.7 Divide output pulse frequency

6.20.8 Define output pulse width

6.20.9 Pulse storage

7. Configuration example

7.1 Configuration procedure

8. Maintenance

8.1 Fault finding during commissioning

8.2 Fault finding after commissioning

8.3 Servicing

8.4 Routine maintenance

8.5 Guarantee

8.6 Customer comments

2222222222222222222

CONTENTS

The BA314G and BA314E are CE marked to show compliance with the European Explosive Atmospheres

Directive 2014/34/EU and the European EMC Directive 2014/30/EU

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9. Accessories

9.1 Units of measurement and instrument

identification.

9.2 Display backlight

9.3 Alarms

9.3.1 Solid state output

9.3.2 Intrinsic safety

9.3.3 Configuration & adjustment

9.3.4 Alarm enable: EnbL

9.3.5 Type of alarm: tYPE

9.3.6 Setpoint adjustment: 5P1x & 5P2x

9.3.7 Alarm function: Hi

. Lo

9.3.8 Alarm output status: no

. nC

9.3.9 Hysteresis: H5tr

9.3.10 Alarm delay: dELA

9.3.11 Alarm silence time: 5IL

9.3.12 Flash display when alarm occurs:

FL5H

9.3.13 Access Setpoint: AC5P

9.3.14 Adjusting alarm setpoints from the display mode.

9.4 4/20mA output

9.4.1 Intrinsic safety

9.4.2 System design

9.4.3 Configuration & calibration

9.4.4 Access 4/20mA output sub-menu:

4-20 oP

9.4.5 Enable 4/20mA output: EnbL

9.4.6 Display which corresponds to 4mA output: 4

. 000

9.4.7 Display which corresponds to 20mA output: 20 . 000

Appendix 1 Dust certification

Appendix 2 IECEx certification

Appendix 3 ETL & cETL certification for

installation in USA and Canada.

Appendix 4 BA314E Tachometer

CONTENTS CONTINUED

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1. DESCRIPTION

These intrinsically safe, Tachometers are primarily intended for measuring rotational speed within hazardous areas. To assist with routine maintenance, they also include a run-time clock that records the number of hours that the monitored machinery has been operating.

The BA314G and the BA314E are functionally identical and have similar certifications, but differ in mechanical construction and options.

The differences are summarised in the following table.

BA314G BA314E

Separate

terminal

compartment.

No Yes

Pulse output Yes Yes

Backlight Option Yes

4/20mA output. Option Yes

Dual alarms Option Yes

Certification

IECEx Gas & dust Gas

ATEX Gas & dust Gas

ETL & cETL Gas & dust Gas & dust

The main sections of this instruction manual describe the BA314G, but also apply to the BA314E. Details of the BA314E mounting and terminals are contained in Appendix 4.

The BA314G and BA314E have been ATEX certified intrinsically safe by Notified Body Intertek Testing and Certification Ltd and comply with the European ATEX Directive 2014/34/EU. The BA314G has gas and dust certification, but the BA314E only has ATEX gas certification.

The main sections of this manual describe ATEX gas certification.

For international applications the BA314G and BA314E also have IECEx certification which is described in Appendix 2. The BA314E does not have IECEx dust certification.

For applications in the USA and Canada the BA314G and BA314E have ETL & cETL certification which is described in Appendix 3.

2. OPERATION

Fig 1 shows a simplified block diagram of the BA314G Tachometer. The instrument can accept pulses from most types of sensor and display speed per second, minute or per hour, plus run-time in hours on a separate display.

The BA314G has a single pair of input terminals for connection to all types of sensor. When connected to a sensor requiring energising, such as a switch contact, open collector or a two wire proximity detector, an external link between terminals 3 and 4 connects power to the sensor input terminals. An isolated pulse output can be configured to synchronously retransmit the pulse input, or a frequency divided frequency output with a defined pulse width.

Factory fitted accessories include an internally powered display backlight, dual alarms and an isolated 4/20mA output which may be configured to retransmit any part of the speed display.

Fig 1 BA314G block diagram

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2.1 Initialisation

Each time power is applied to a Tachometer initialisation is performed. After a short delay the following display sequence occurs:

All segments of the display are activated

Tachometer starts functioning, using the

configuration information stored in the instrument’s permanent memory. Unless the run-time display has been reset to zero, new elapsed time will be added to the existing runtime total.

2.2 Controls

The BA314G is controlled and configured via four front panel push buttons. In the display mode i.e. when the instrument is displaying speed the push button functions are:

Push Button Functions

& + * Resets run-time display to zero.

This is a configurable function. See 6.15

)

+ * Run-time grand total.

If buttons are pressed for ten seconds or longer grand total run-time is reset to zero. This is a configurable function. See 6.16

( + & Shows in succession, firmware version

number, instrument function tacho and any output accessories that are fitted:

- A Dual alarm outputs

- P Pulse output

(Fitted to all BA314G)

- C 4/20mA output

( + ) Access to configuration menu

Note: When optional alarms are fitted, the Tachometer may be configured to provide direct access to the alarm setpoints from the display mode when the ( + * buttons are operated. See 9.4.13 and 9.4.14

2.3 Displays

The BA314G has two digital displays and associated annunciators, plus a pulse input indicator as shown on page 1.

Speed On upper eight digit display display

Run-time On lower six digit display. display Shows time in hours, with a

resolution of 0.1 hours, that monitored machinery has been operating. May be turned off. See 6.8

Pulse input This disc in the lower left hand indicator corner of the display 'rotates'

for two seconds each time an input pulse is received. Appears to rotate continuously when input frequency exceeds

0.5Hz.

Hold Activated when input frequency annunciator is below the clip-off threshold at

which the run-time timer stops functioning.

Reset Activated while run-time display annunciator is being reset to zero.

Grand total Activated while run-time grand annunciator total which is shown in hours is

being displayed.

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3. INTRINSIC SAFETY CERTIFICATION

The BA314G has ATEX and IECEx gas and dust certification. This section of the instruction manual describes ATEX gas certification. ATEX dust and IECEx approvals are described in Appendixes 1 and 2.

3.1 ATEX gas certification

Notified Body Intertek Testing and Certification Ltd have issued the BA314G with an EU-Type Examination Certificate number ITS16ATEX28408X. This confirms compliance with harmonised European standards and it has been used to confirm compliance with the European ATEX Directive for Group II, Category 1G equipment, Ex ia IIC T5 Ga equipment. The Tachometer carries the community mark and, subject to local codes of practice, may be installed in any of the European Economic Area (EEA) member countries. ATEX certificates are also acceptable for installations in Switzerland.

This section of the instruction manual describes ATEX installations in explosive gas atmospheres conforming with EN 60079-14 Electrical installations design, selection and erection. When designing systems for installation outside the UK the local Code of Practice should be consulted.

3.2 Zones, gas groups and T rating

The BA314G Tachometer has been certified Ex ia IIC T5 Ga. When connected to a suitable system it may be installed in:

Zone 0 explosive gas air mixture

continuously present.

Zone 1 explosive gas air mixture likely

to occur in normal operation.

Zone 2 explosive gas air mixture not

likely to occur, and if it does will only exist for a short time.

Be used with gases in groups:

Group A propane Group B ethylene Group C hydrogen

In gases that may be used with equipment having a temperature classification of:

T1 450°C T2 300°C T3 200°C T4 135°C T5 100°C

At ambient temperatures between -40 and +70°C.

CAUTION installation in Zone 0

When installed in a Zone 0 potentially explosive atmosphere requiring EPL Ga apparatus, the instrument shall be installed such that even in the event of rare incidents, an ignition source due to impact or friction between the aluminium label and iron/steel is excluded.

No special conditions apply when the BA314G Tachometer is installed in Zone 1 or in Zone 2. This allows the BA314G to be installed in all gas Zones and to be used with most common industrial gases except carbon disulphide and ethyl nitrite which have an ignition temperature of 95°C.

3.3 Power supply

When installed in a hazardous area the BA314G should be powered from a certified Zener barrier, galvanic isolator or associated apparatus with an intrinsically safe voltage output. The safety parameters of terminals 1 and 2 are:

Ui = 28V dc Ii = 200mA dc Pi = 0.84W Uo = 0 Io = 0

Any certified Zener barrier, galvanic isolator or associated apparatus with output safety parameters equal to or less than these input limits may be used.

The maximum equivalent capacitance and inductance between terminals 1 and 2 is:

Ci = 2nF Li = 4µH

To determine the maximum permissible cable parameters the above figures, which are small and may be ignored in some applications, should be subtracted from the maximum permitted cable parameters specified for the Zener barrier, galvanic isolator or associated apparatus powering the BA314G Tachometer.

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3.4 Pulse input terminals

The BA314G Tachometer has a single pair of pulse input terminals 5 and 6 that may be configured for use with different types of sensor.

For sensors that require energising to determine their state, such as switch contacts or a 2-wire proximity detector, an external link between terminals 3 & 4 of the BA314G connects an internal 7V, 6mA supply to the input. Energising is not required when the Tachometer's input is connected to a voltage pulse source.

Fitting an external link between terminals 3 & 4 changes the output safety parameters of the Tachometer input terminals 5 & 6 as shown in the following table. This table also shows the types of sensor requiring energising (link fitting).

Output safety parameters

Type of input Link 3 & 4 Uo Io Po

Switch contact Yes 10.5V 9.2mA 24mW Proximity detector Yes 10.5V 9.2mA 24mW Open collector Yes 10.5V 9.2mA 24mW Magnetic pick-off No 1.1V 0.5mA 0.2mW Voltage input (low) No 1.1V 0.5mA 0.2mW Voltage input (high) No 1.1V 0.5mA 0.2mW

3.4.1 Sensor not requiring energising

Sensors employing magnetic pick-offs or voltage pulse sensors do not require energising, therefore terminals 3 & 4 should not be linked. When not energised i.e. without a link, the output parameters of the pulse input terminals comply with the requirements for simple apparatus. For intrinsic safety purposes, sources of energy with output parameters less than 1.5V; 100mA and 25mW are considered to be simple apparatus (Clause 5.7 of EN60079-11), which allows their output parameters Uo, Io & Po to be ignored when assessing the safety of an intrinsically safe system, thus simplifying loop assessment and documentation.

Almost any Sensor with a voltage pulse output may be directly connected to the BA314G input in a hazardous area providing that:

a. The Sensor is a certified intrinsically safe device

having output parameters equal to or less than:

Uo  28V dc Io  200mA dc Po  0.84W

or complies with requirements for

simple apparatus.

b. The Sensor and associated wiring can withstand

a 500V rms insulation test to earth.

c. The Sensor is located in the same hazardous

area as the BA314G. The BA314G EU-Type Examination Certificate specifies that the equivalent capacitance and inductance of the pulse input is:

Ci = 2nF Li = 4µH

To determine the maximum permissible cable parameters these figures should be subtracted from the maximum permitted output parameters Lo and Co specified by the certificate for the Sensor connected to the totaliser's pulse input terminals. The totalisers pulse input equivalent capacitance and inductance are small and unlikely to make a significant difference to the allowable cable parameters.

3.4.2 Sensors requiring energising

Sensors with switch contacts, proximity detector or open collector outputs require energising which is achieved by linking Tachometer terminals 3 and 4 together as described in section 3.4. When energised, the output parameters of the pulse input terminals 5 and 6 are:

Uo = 10.5V dc Io = 9.2mA dc Po = 24mW

These output parameters do not comply with the requirements for simple apparatus and should be considered when assessing the safety of the Sensor connected to the totaliser pulse input.

Any certified intrinsically safe Sensor may be connected to a BA314G energised input providing that:

a. The Sensor is a certified intrinsically safe

device having input parameters equal to or greater than:

Uo  10.5V dc Io  9.2mA dc Po  24mW

or complies with the requirements for

simple apparatus such as switch contacts.

b. The Sensor and associated wiring can

withstand a 500V rms insulation test to earth.

c. The Sensor is located in the same hazardous

area as the BA314G.

d. Minimum operating voltage of a proximity

detector is less than 7.5V.

e. The maximum capacitance and inductance that

may be safely connected to the energised pulse input terminals 5 & 6 (terminals 3 & 4 linked) is:

Co = 2.4µF Lo = 200mH

This is not restrictive as the combined capacitance and inductance of most sensors and the connecting cable will be less than this.

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3.5 Remote reset terminals

The BA314G run-time display may be reset to zero by connecting the external reset terminals RS1 and RS2 together for more than one second. The two reset terminals have the following input and output safety parameters:

Uo = 3.8V dc Io = 1mA Po = 1mW

Ui = 28V dc Ii = 200mA dc Pi = 0.84W

The equivalent capacitance and inductance between them is:

Ci = 0 Li = 0

The maximum cable capacitance and inductance that may be safely connected between the reset terminals RS1 and RS2 is:

Co = 40µF Lo = 1H

The reset terminals may be directly connected to any mechanically operated switch located within the same hazardous area as the BA314G Tachometer. The switch and associated wiring should be able to withstand a 500V insulation test to earth.

If the reset switch is required in the safe area a Zener barrier or intrinsically safe relay is required to transfer the contact closure into the hazardous area. Almost any intrinsically safe relay with certification permitting the contacts to be connected to equipment in the hazardous area may be used. A diode return Zener barrier is not suitable for this application.

Alternatively the BA314G may be configured so that the total display is reset to zero when the & and * push buttons are operated simultaneously for more than two seconds. See 6.19

3.6 Certification label information

The Tachometer certification information label is fitted in a recess on the top outer surface of the instrument enclosure. It shows the ATEX, IECEx and ETL certification information plus BEKA associates name, location, year of manufacture and the instrument serial number. Other certification information may also be included.

BA314G Certification information label

4. SYSTEM DESIGN FOR HAZARDOUS AREAS

4.1 Use with Zener barriers

Zener barriers are the least expensive intrinsically safe interface between a safe and hazardous area. However they require a high integrity earth connection that may be expensive to install and they do not provide isolation. When a high integrity earth connection is not already available, it may be less expensive and complicated to use galvanic isolators for the installation of a single BA314G.

Terminals 2, 6 and RS2 of the BA314G Tachometer are internally connected together. If any of these terminals are earthed, as shown in Figs 2 & 3, the other common terminals should only be connected to the same earth, i.e. the barrier busbar, or to circuits that have 500V insulation to earth.

Any Zener barrier may be used with the BA314G providing it's certification is for use with apparatus in the required Zone and gas group, and it's output parameters do not exceed the input parameters of the Tachometer terminals to which it is connected. Only one polarity of Zener barrier i.e. positive or negative, may be used in a Tachometer system.

Fig 2 illustrates the basic circuit that is used for all BA314G installations protected by Zener barriers. For simplicity, connections for the pulse output and optional alarms and 4/20mA output are shown separately in sections 6.20 and 9 of this manual.

Fig 2 BA314G used with Zener barriers

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Alternatively the pulse source may be located in the safe area. Fig 3 shows how an additional Zener barrier is used to transfer the signal to the Tachometer in the hazardous area. When more than one Zener barrier is used in a system all must have the same polarity, i.e. all positive or all negative barriers. When designing a system it is important to remember that terminals 2, 6 and RS2 are interconnected within the BA314G. See Fig 1.

Fig 3 BA314G used with Zener barriers pulse source

in the safe area.

4.1.1 Power supply

The BA314G Tachometer requires a minimum of 10V between terminal 1 & 2 and consumes:

10mA without optional backlight

plus 6mA when terminals 3 & 4 are linked

Any certified Zener barrier may be used to power a BA314G Tachometer providing the output safety parameters of the barrier are equal to or less than the input safety parameters of terminals 1 & 2 of the Tachometer.

Although this allows a wide variety of barriers to be used, a positive polarity 28V; 93mA; 300 Zener barrier, which has an end-to-end resistance of about 340, is an industry standard device which is frequently used. With this barrier the supply voltage in the safe area must be between 15.5V and the maximum working voltage of the Zener barrier which, depending upon manufacturer, will be approximately 26V.

Note: The optional factory fitted display backlight

increase the instrument's current consumption to 32mA and therefore increases the minimum safe area operating voltage, see section 9.2 for details.

4.1.2 Pulse input

As shown in Figs 2 and 3 the BA314G can display the rate and total flow from sensors with a wide variety of pulse outputs located in safe and hazardous areas.

No Zener barrier is required in series with the input if the intrinsically safe sensor is located within the same hazardous area as the Tachometer. The following table shows the Tachometer's input switching thresholds when conditioned for use with sensors having different outputs, For reliable totalisation the Tachometer pulse input must fall below the lower threshold and rise above the upper threshold.

Input transducer

Switching thresholds

Lower Upper

Open collector 2k 10k

Voltage pulse

low

1.0V 3.0V

Voltage pulse

high

3.0V 10.0V

Magnetic pick-off 0 40mV peak

Proximity

detector

1.2mA 2.1mA

Switch 100 1000

Switch contact, proximity detector or open collector sensors require energising which is achieved by linking Tachometer terminals 3 and 4.

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4.1.3 Switch contact input

Any mechanically or magnetically activated switch contact located in the same hazardous area as the Tachometer may be directly connected to pulse input terminals 5 and 6, providing the sensor and associated wiring can withstand a 500V rms insulation test to earth. Most magnetically activated reed relays comply with these requirements and the requirements for simple apparatus. The BA314G contains a configurable debounce circuit to prevent false triggering. Three levels of de-bounce protection are available. See section 6.6.

4.1.4 Open collector input

Most certified intrinsically safe sensors with an open collector output may be directly connected to a BA314G input terminals 5 & 6, providing the input safety parameters of the open collector sensor are equal to or greater than the output safety parameters of Tachometer's pulse input. i.e.

Ui  10.5V dc Ii  8.2mA dc Pi  24mW

The open collector sensor must be located in the same hazardous area as the BA314G and the associated wiring should be able to withstand a 500V rms insulation test to earth.

The BA314G contains a configurable debounce circuit to prevent false triggering. Three levels of de-bounce protection are available. See section 6.6.

4.1.5 2-wire proximity detector input

Most certified intrinsically safe sensors incorporating a NAMUR 2-wire proximity detector may be directly connected to a BA314G input, providing the input safety parameters of the sensor (proximity detector) are equal to or greater than the output safety parameters of Tachometer's pulse input. i.e.

Ui  10.5V dc Ii  8.2mA dc Pi  24mW

The minimum operating voltage of the sensor (proximity detector) should be less than 7.5V. The sensor must be located in the same hazardous area as the BA314G and the associated wiring should be able to withstand a 500V rms insulation test to earth.

The Tachometers contain a configurable debounce circuit to prevent false triggering. Three levels of debounce protection are available. See section 6.6.

4.1.6 Magnetic pick-off input

Sensors incorporating a magnetic pick-off to sense movement will have a low level voltage output unless the sensor incorporates an amplifier. CoiL in the BA314G input configuration menu is a low level voltage pulse input intended for use with an intrinsically safe magnetic pick-off. When a Tachometer is configured for CoiL and terminals 3 & 4 are not linked, the input terminals 5 & 6 comply with the requirements for simple apparatus allowing connection to any certified intrinsically safe magnetic sensor having output parameters equal to or less than:

Uo  28V dc Io  200mA dc Po  0.84W

The maximum permitted cable parameters will be the magnetic pick-off's Co and Lo specified on it's intrinsic safety certificate, less the Tachometers pulse input parameters Ci and Li which are small and can often be ignored.

The sensor must be located within the same hazardous area as the Tachometer and with the associated wiring be able to withstand a 500V rms insulation test to earth.

The Tachometer contains a configurable debounce circuit to prevent false triggering. Three levels of debounce protection are available. See section 6.6.

4.1.7 Voltage pulse input

Two voltage pulse input ranges are selectable in the BA314G Tachometer configuration menu, VoLt5 L and VoLt5 H

. When configured for either of the voltage pulse ranges and terminals 3 & 4 are not linked, the input terminals 5 & 6 comply with the requirements for simple apparatus. This allows the input to be connected to any certified intrinsically safe voltage out[put sensor located in the same hazardous area as the Tachometer having output parameters equal to or less than:

Uo  28V dc Io  200mA dc Po  0.84W

The Tachometer input may therefore be directly connected to most certified intrinsically safe sensors with a high level voltage pulse output.

The maximum permitted cable parameters will be defined by the intrinsic safety certification of the sensor less the Tachometers input parameters Ci & Li which are small and can often be ignored.

The Tachometers contain a configurable debounce circuit to prevent false triggering of the instrument. Three levels of de-bounce protection are available. See section 6.7.

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4.1.8 Remote reset

The Tachometer's run-time display may be remotely reset to zero by connecting terminals RS1 and RS2 together for more than one second. Permanent interconnection inhibits the run-time clock. Remote resetting may be accomplished by any mechanically operated switch located in the same hazardous area as the Tachometer providing the switch and the associated wiring can withstand a 500V rms insulation test to earth. No Zener barrier is required.

A BA314G may also be remotely reset from the safe area. Any switch may be used but a Zener barrier is required to transfer the contact closure into the hazardous area which may be combined with the supply barrier so that only one package is required. A diode return barrier is not suitable for this application. Fig 2 illustrates how a BA314G may be reset from both the safe and the hazardous area.

Note: The Tachometer may be configured to reset

the total display to zero by operating the & and * push buttons simultaneously for more than two seconds in the totalising mode i.e. when the instrument is displaying flow. See section 6.15.

4.2 Use with Galvanic Isolators Galvanic isolators are probably the simplest intrinsically safe interface to install as they provide isolation and do not require a high integrity earth connection.

Any galvanic isolator may be used with the BA314G providing it's certification is for use with apparatus in the required Zone and gas group, and it's output parameters do not exceed the input parameters of the Tachometer terminals to which it is connected. It must also have the correct function.

Fig 4 BA314G used with galvanic isolators.

Fig 4 illustrates the basic circuit that is used for all BA314G Tachometer installations protected by galvanic isolators. For simplicity, connections for the pulse output, optional alarms and 4/20mA output are shown in sections 6.20 and 9 of this manual.

The Tachometer’s pulse source may also be located in the safe area as shown in Fig 5. An additional galvanic isolator is used to transfer the signal to the Tachometer in the hazardous area, although it may be difficult to find isolators for transferring some sensor outputs.

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Fig 5 Pulse source in safe area

4.2.1 Power supply

The BA314G Tachometer requires a minimum of 10V between terminal 1 & 2 and consumes:

10mA without optional backlight

plus 6mA when terminals 3 & 4 are

linked.

The total current increases to 32mA when an optional backlight is fitted.

Any galvanic isolator certified for the gas group and Zone in which the BA314G is installed may be used to power the instrument. The output safety parameters of the isolator must be equal to or less than the input safety parameters of terminals 1 & 2 and the voltage at terminals 1 & 2 must be greater than 10V. These requirements are not restrictive and allow a wide range of galvanic isolators, such as solenoid drivers, to be used.

4.2.2 Pulse input

As shown in Figs 4 and 5 the BA314G input can be directly connected to hazardous area sensors, or to safe area sensors via an isolator. Galvanic isolators are not required in series with the input if the intrinsically safe sensor is located within the same hazardous area as the Tachometer.

The BA314G Tachometer may be used with sensors having a wide variety of pulse outputs. The following table shows the switching thresholds for each type. For reliable operation the Tachometers input signal must fall below the lower threshold and rise above the upper threshold.

Input transducer Switching thresholds

Lower Upper

Open collector 2k 10k

Voltage pulse low 1.0V 3.0V

Voltage pulse high 3.0V 10.0V

Magnetic pick-off 0mV 40mV peak

Proximity detector 1.2mA 2.1mA

Switch 100 1000

Switch contacts, proximity detectors and open collector sensors require energising which is achieved by linking terminals 3 and 4 together as shown in Figs 4 and 5.

4.2.3 Switch contact input

Any sensor with a mechanical or magnetically activated switch contact output may be directly connected to input terminals 5 & 6 providing the sensor is located in the same hazardous area as the Tachometer and the sensor and associated wiring can withstand a 500V rms insulation test to earth. Most magnetically activated reed relays comply with these requirements. The BA314G contain a configurable debounce circuit to prevent contact bounce being counted. Three levels of de-bounce protection are independently available. See section

6.6.

4.2.4 Open collector input

Most certified intrinsically safe open collector sensors may be directly connected to the BA314G input terminals 5 & 6, providing the input safety parameters of the open collector sensor are equal to or greater than the output safety parameters of Tachometer's pulse input. i.e.

Ui  10.5V dc Ii  8.2mA dc Pi  24mW

The open collector sensor must be located in the same hazardous area as the BA314G and the associated wiring should be able to withstand a 500V rms insulation test to earth.

The BA314G contains a configurable debounce circuit to prevent false triggering. Three levels of debounce protection are independently available. See section 6.6.

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4.2.5 2-wire proximity detector input

Most certified intrinsically safe NAMUR 2-wire proximity detectors may be directly connected to a BA314G input, providing the input safety parameters of the proximity detector are equal to or greater than the output safety parameters of a BA314G input:

Ui  10.5V dc Ii  8.2mA dc Pi  24mW

and the minimum operating voltage of the proximity detector is less than 7.5V. The proximity detector must be located in the same hazardous area as the Tachometer and the associated wiring must be able to withstand a 500V rms insulation test to earth.

The BA314G contain a configurable debounce circuit to prevent false triggering of the instrument. Three levels of de-bounce protection are available. See section 6.6.

4.2.6 Magnetic pick-off input

CoiL in the BA314G input configuration menu is a low level voltage pulse input intended for use with an intrinsically safe magnetic pick-off. When a Tachometer input is configured for CoiL and terminals 3 & 4 are not linked, input terminals 5 & 6 comply with the requirements for simple apparatus allowing connection to any certified intrinsically safe magnetic sensor having output parameters equal to or less than:

Uo  28V dc Io  200mA dc Po  0.84W

The maximum permitted cable parameters will be be the sensor's Co and Lo specified on it's intrinsic safety certificate, less the Tachometers pulse input parameters Ci and Li which are small and can often be ignored.

The sensor must be located within the same hazardous area as the BA314G and with the associated wiring must be able to withstand a 500V rms insulation test to earth.

The BA314G Tachometer contains a configurable debounce circuit to prevent false triggering. Three levels of debounce protection are available. See section 6.6.

4.2.7 Voltage pulse input

Two voltage pulse input ranges are independently selectable in the BA314G Tachometer configuration menu, VoLt5 L and VoLt5 H. When configured for either of the voltage pulse ranges, and terminals 3 & 4 are not linked, the input terminals 5 & 6 comply with the requirements for simple apparatus. This allows the pulse input to be connected to any certified intrinsically safe sensor with a voltage output located within the same hazardous area as the Tachometer providing it has output parameters equal to or less than:

Uo  28V dc Io  200mA dc Po  0.84W

The BA314G Tachometers may therefore be directly connected to most certified intrinsically safe sensors with a high level voltage output.

The maximum permitted cable parameters will be defined by the sensor's intrinsic safety Co and Lo less the Tachometer's pulse input parameters Ci and Li which are small and can often be ignored.

The BA314G contain a configurable debounce circuit to prevent false triggering of the instrument. Three levels of de-bounce protection are available. See section 6.6.

4.2.8 Remote reset

A BA314G may also be remotely reset from the safe area. Any switch may be used but a galvanic isolator is required to transfer the contact closure into the hazardous area. Fig 4 illustrates how a BA314G may be reset from both the safe and the hazardous area.

Note: The BA314G Tachometer may be

configured to reset the total display to zero by operating the & and * push buttons simultaneously for more than two seconds in the totalising mode i.e. when the instrument is displaying flow. See 6.15

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5. INSTALLATION

5.1 Location

The BA314G Tachometer is housed in robust IP66 glass reinforced polyester (GRP) enclosure incorporating an armoured glass window and stainless steel fittings making it suitable for exterior mounting in most industrial on-shore and off-shore installations. The Tachometer should be positioned where the display is not in continuous direct sunlight. Special conditions apply for Zone 0 installations, see section

3.2.

Field wiring terminals are located on the rear of the Tachometer assembly as shown in Fig 7.

To ensure electrical continuity between the two conduit or cable entries, the enclosure back-box is fitted with a bonding plate which includes an M4 earth stud. This may be mounted on the inside or outside of the enclosure. If the carbon loaded GRP enclosure is not bolted to an earthed post or structure, this earth stud should be connected to a local earth or to the plant potential equalising conductor.

An insulated M4 stud is provided in the bottom right hand corner the back-box for interconnecting cable screens.

The BA314G Tachometer may be pipe mounted using a BA393G pipe mounting kit, or panel mounted using a BA394G or BA395G panel mounting kit.

5.2 Installation Procedure

Fig 6 illustrates the instrument installation procedure.

A. Remove the Tachometer assembly by

unscrewing the four captive 'A' screws.

B. Mount the enclosure back-box on a flat surface

and secure with screws or bolts through the four 'B' holes. Alternatively use one of the pipe or panel mounting kits which are available as accessories.

C. Remove the temporary hole plug and install an

appropriate IP and temperature rated M20 x

1.5mm cable gland or conduit fitting. If two entries are required, the supplied IP66 stopping plug should be replaced with an appropriate IP and temperature rated M20 x 1.5mm cable gland or conduit fitting.

D. Connect the field wiring to the terminals as

shown in Fig 7. Replace the instrument assembly on the back-box and evenly tighten the four 'A' screws.

Fig 6 BA314G installation procedure

Fig 7 Dimensions and terminal connections

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5.3 EMC

The BA314G complies with the requirements of the European EMC Directive 2014/30/EU. For specified immunity all wiring should be in screened twisted pairs, with the screens earthed at one point in the safe area.

5.4 Units of measurement and tag marking on scale card.

The Tachometer's units of measurement and tag information can be shown on a scale card which slides into the instrument.

New Tachometers are supplied with a printed scale card showing the requested units of measurement and tag information. If this information is not supplied when the instrument is ordered, a blank scale card will be fitted which can easily be marked on-site with a dry transfer or a permanent marker. Custom printed scale cards are available from BEKA associates as an accessory.

To remove the scale card from a Tachometer carefully pull the transparent tab at the rear of the instrument assembly away from the assembly as shown in Fig 8a.

Fig 8a Removing scale card

To replace the scale card carefully insert it into the slot on the right hand side of the input terminals as shown in Fig 8b. Force should be applied evenly to both sides of the scale card to prevent it twisting. The card should be inserted until about 2mm of the transparent tab remains protruding.

Fig 8b Inserting scale card into the instrument assembly.

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6.0 CONFIGURATION & CALIBRATION

The BA314G Tachometer is configured and calibrated via four front panel push buttons. All the configuration functions are contained in an easy to use intuitive menu that is shown diagrammatically in Fig 10.

Each menu function is summarised in section 6.3 of this manual and each summary includes a reference to more detailed information.

When factory fitted optional alarms, pulse and 4/20mA outputs are included, additional functions appear in the configuration menu, which are described separately in section 9.

All new Tachometer are supplied calibrated as requested at the time of ordering. If calibration is not requested, the Tachometer will have default configuration as shown in the following table, but can easily be re-configured on-site.

Function Display Default

Input inP . tYPE oP . CoL Debounce dEbounCE dEFAuLt Update uPdAtE 0 . 5 Run-time display di5P-2 on Decimal point (speed) dP 00 00

. 0

Speed scale factor 5CALE . 5001 . 00 Timebase t-bA5E tb-60 Filter FiLter 24 Clip-off CLP-oFF 0000 . 0 Local run-time reset clr tot oFF Local grand total run-time reset. Clr gtot oFF Security code CodE 0000

6.1 Calibration structure

Fig 9 shows the BA314G calibration structure.

The pulse input is divided by 5CALE.5 to provide the required Tachometer speed display in engineering units. e.g. if a sensor monitoring a rotating shaft generates 18 pulses per revolution, to produce a display in revolutions 5CALE.5 should be set to 18.0.

The timebase t-bA5E is a multiplying factor that determines whether the Tachometer displays speed per second, per minute or per hour.

The Tachometer incorporates a run-time counter that displays the time in hours that the speed of the monitored machinery has been equal to or greater than the Clip-off value.

Fig 9 Calibration structure

6.2 Accessing configuration functions

Throughout this manual push buttons are shown as &, *, ( and ). Legends displayed by the instruments are shown in a seven segment font as they appear on the Tachometers e.g. inPut and uPdAtE.

Access to the configuration menu is obtained by operating the ( + ) push buttons simultaneously. If the instrument is not protected by a security code the first parameter inPut will be displayed. If a security code other than the default code 0000 has already been entered, the instrument will display CodE. Press ( to clear this prompt and enter the security code for the instrument using the & or * push button to adjust the flashing digit, and the ( push button to transfer control to the next digit. If the correct code has been entered pressing ) will cause the first parameter inPut to be displayed. If an incorrect code is entered, or a push button is not operated within ten seconds, the instrument will automatically return to the display mode.

All configuration functions and prompts are shown on the upper eight digit display.

Once within the configuration menu the required parameter can be selected by scrolling through the menu using the & or * push buttons. The configuration menu is shown diagrammatically in Fig 10.

When returning to the display mode following reconfiguration, the Tachometer will display dAtA followed by 5AVE while the new information is stored in permanent memory.

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6.3 Summary of configuration functions

This section summarises all the configuration functions. When read in conjunction with Fig 10 it provides a quick aid for configuring the Tachometer. If more detail is required, each section contains a reference to a full description of the function.

Display Summary of function

inPut Input

Contains sub-menu with two functions:

inP

. tYPE Select Input type

dEbounCE Set debounce

See section 6.4

inP . tYPE

Configures the Tachometer to accept one of six types of input:

. CoL Open collector *

VoLt5 L Voltage pulse <1 >3V VoLt5 H Voltage pulse <3 >10V CoiL Magnetic pick-off

. dEt Proximity detector *

ContACt Switch contact *

* Link terminals 3 & 4

See section 6.5

dEbounCE

Defines level of input debounce applied to the pulse input to prevent false counting, three levels are selectable:

dEFAuLt heavy LiGHt

See section 6.6

uPdAtE Display update interval

Defines the interval between display updates from 0.5 to 5 seconds.

See section 6.7

di5P-2 Run-time display

Turns the lower display, which shows run-time in hours, on or oFF.

See section 6.8

Display Summary of function

dP Decimal points

Defines the position of the decimal point in the Tachometer speed display.

See section 6.9

5CALE

. 5 Speed scale factor

5CALE.5 is a dividing factor,

adjustable between 0.0001 and 99999, that converts the pulse input into the required Tachometer speed display.. e.g. If a sensor monitoring a rotating shaft generates 18 pulses per revolution, to produce a Tachometer speed display in revolutions 5CALE.5 should be set to

18.0.

See section 6.10

t-bA5E Timebase

Selectable multiplier allowing Tachometer speed display to be in units per second, per minute or per hour. Select:

tb-01 per second tb-60 per minute

tb-3600 per hour

See section 6.11

FiLtEr Display filter

Adjustable digital filter that reduces the noise on the Tachometer speed display, comprising two parameters each adjustable between 0 and 9. The first digit defines the amount of filtering applied to the display, the second the deviation from the displayed value at which the filter will be overridden and the Tachometer display will move rapidly to the new value.

See section 6.12

CLP-oFF Clip-off

Clip-off is the Tachometer speed display threshold below which the run-time clock is inhibited.

See section 6.13

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Display Summary of function

LoC clr Local reset

Contains sub-menu with two functions enabling the run-time display and grand total run-time to be reset to zero via the front panel push buttons when the Tachometer is in the display mode.

See section 6.14

clr tot

When ‘on’ is selected, operating the & and * buttons simultaneously for more than three seconds in the display mode resets the run-time display to zero.

See section 6.15

clr gtot When on is selected, operating the ) and * buttons simultaneously

for more than 10 seconds in the display mode resets the run-time grand total to zero.

See section 6.16

Display Summary of function

CLr Gtot Resets grand total run-time to

zero.

This function resets the grand total run-time to zero from within the configuration menu when CLr YE5 is selected, and 5urE is entered to confirm the instruction. Note: Once reset, the original grand total can not be recovered.

See section 6.17

CodE Security code

Defines a four digit alphanumeric code that must be entered to gain access to the configuration menu. Default code 0000 disables the security function and allows unrestricted access to all configuration functions.

See section 6.18

r5Et

deF Reset to factory defaults

Returns the Tachometer to the factory defaults shown in section 6.0 To prevent accidental use the request must be confirmed by entering 5urE before the reset will be executed.

See section 6.19

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6.4 Input: inPut

The Input function contains two sub-functions

inP

. tYPE and dEbounCE which configure the

Tachometer input and define the amount of input noise rejection.

6.5 Input type: inP

. tYPE

inP

. tYPE is a sub-menu in the inPut function which

defines the type of input sensor or input pulse with which the Tachometer will function. To check or change the type of input, select inPut in the main configuration menu and press ( which will reveal the

inP

. tYPE prompt, pressing ( again will show the

present type of input. If set as required press ) twice to return to the configuration menu, or repeatedly press the & or * button until the required type of input is displayed and then press ) twice to return to the configuration menu.

One of following six types of input may be selected:

Switching thresholds Low High

oP . CoL Open collector

210k

VoLt5L Voltage pulse low

13V

VoLt5H Voltage pulse high

310V

CoiL Magnetic pick-off 0 40mV Pr

. dEt Proximity detector

1.2 2.1mA

ContACt Switch contact

100 1000

Notes:

1 Maximum voltage input +30V.

2 For sensors that require energising i.e.

proximity detectors, switch contacts and open collectors, terminals 3 & 4 of the Tachometer should be linked together.

3 To count correctly, the input pulse must fall

below the lower switching threshold and rise above the higher switching threshold.

4 See section 6.6 for the typical maximum

operating frequency.

6.6 Debounce: dEbouncE dEbouncE is an adjustable sub-menu in the inPut

function which prevents the Tachometer miscounting when the input pulse has noisy edges, such as those resulting from a mechanical contact closing and bouncing. Three levels of protection may be selected and the amount of debounce applied depends upon the type of Tachometer input that has been selected in the inP

. tYPE function.

The following table shows the minimum time that the input pulse must be continuously above the upper input switching threshold and continuously below the lower switching threshold to ensure that the Tachometer processes the input pulse. Input switching thresholds are shown in section 6.5.

De-bounce

level

Min input pulse width

Type of Input

Contact All others

Default 1600µs 40µs

Heavy 3200µs 350µs

Light 400µs 5µs

The Tachometer’s maximum counting frequency depends upon the debounce level selected, the shape of the input pulse and its amplitude. The following table assumes a square wave input and is only for guidance. The maximum operating frequency will be lower if the input pulses have sloping edges and the pulse amplitude only slightly exceeds the input switching thresholds.

ONLY FOR GUIDANCE

Debounce

level

Max counting frequency

Type of input

Contact All others

Default 150Hz 5kHz

Heavy 75Hz 1kHz

Light 500Hz 20kHz

The dEbouncE function is a sub-menu located in the inPut function. Select inPut in the configuration menu and press ( which will reveal the inP

. tYPE

prompt, press the & or * button to select dEbouncE followed by ( to reveal the existing

setting. Pressing the & or * button will scroll through the three levels. When the required level has been selected, pressing ) twice will enter the selection and return the display to the inPut prompt in the configuration menu.

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6.7 Display update interval: uPdAtE

If the Tachometer display is likely to change rapidly, a longer interval between display updates may simplify reading the display. This function allows one of six different display intervals between 0.5 and 5 seconds to be selected. The selected display update interval does not affect the update time of any other instrument function.

To adjust the update interval select uPdAtE from the configuration menu and press ( to reveal the current time. Pressing the & or * button will scroll through the six times. When the required interval has been selected press ) to enter the selection and return to the configuration menu.

6.8 Run-time display: di5P-2

This function turns the run-time display on or off, although the run-time timer continues to function when the display is off.

To check the status of the run-time display, select

di5P-2 from the configuration menu and press ( that will reveal if the run-time display is on or oFF.

The setting may be changed by pressing the & or * button followed by the ) button to enter the selection and return to the configuration menu.

6.9 Position of the decimal points: dP

This function positions the decimal point in the Tachometer speed display. To adjust select dP from the configuration menu and press (. The Tachometer display will be activated and identified by the display annunciator as RATE. The decimal point, which may be positioned between any of the digits or may be absent is positioned by operating the & or * push button. When set as required enter the setting and return to the configuration menu by operating the ) button.

6.10 Speed scale factor: 5CALE

. 5

5CALE.5 is a dividing factor adjustable between 0.0001

and 99999 that enables the Tachometer speed display to be in the required engineering units. e.g. If a sensor monitoring a rotating shaft generates 18 pulses per revolution, to produce a Tachometer speed display in revolutions 5CALE.5 should be set to 18.0.

The units of the Tachometer speed display are pulses per unit of time. The unit of time is the timebase of the instrument which is determined by t-bA5E which is described in section 6.11.

To check or change the speed scale factor select

5CALE

. 5 from the configuration menu and press (

which will reveal the existing value with one digit flashing. The value of the flashing digit may be changed by pressing the & or * button.

When this digit has been adjusted as required, pressing ( will transfer control to the next digit. When all the digits have been adjusted pressing ( will transfer control to the decimal point which may be positioned between any of the digits, or may be omitted by moving it to the right of the least significant digit. When the required speed scale factor has been entered, press ) to return to the

5CALE

. 5 prompt in the configuration menu.

6.11 Timebase: t-bA5E

The timebase multiplies the Tachometer speed display by 1, 60 or 3,600 depending upon whether the Tachometer is required to display speed per second, per minute or per hour. e.g. RPS, RPM or RPH. See Fig 9.

To check or change the timebase, select t-bA5E from the configuration menu and press ( which will reveal the current setting. Pressing the & or * button will scroll through the three options:

tb-1 speed per second

tb-60 speed per minute

tb-3600 speed per hour

When the required multiplier is displayed press ) to return to the t-bA5E prompt in the configuration menu.

6.12 Display filter: FiLtEr

The digital display filter has two independent adjustable parameters enabling the Tachometer speed display response to be tailored for optimum performance. The filter parameters are controlled by a two digit number. The first digit defines the amount of filtering applied to the display as shown below.

First digit Filter time constant

seconds 0X 0 1X 1.3 2X 4.3 3X 6.5 4X 8.7 5X 11.3 6X 15.7 7X 20.9 8X 25.2 9X 31.5

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The second digit defines the deviation from the displayed speed at which the filtering defined by the first digit will be overridden and the Tachometer speed display will move rapidly to the new value.

Second

digit

Magnitude of input

step change which will override the filter and move the speed display rapidly to the

new value.. X0 Off X1 1% X2 2% X3 4% X4 8% X5 12% X6 16% X7 24% X8 32% X9 64%

By careful adjustment of the two parameters a stable display with an acceptable input step response can be obtained for most applications.

During commissioning it is recommended that initially the second digit is set to 0 (off) and the first digit is adjusted to provide an acceptable Tachometer display stability. The second digit should then be increased until the selected step size is greater than the noise on the display, at which setting the Tachometer speed display will become stable. These will be the optimum filter parameters for acceptable Tachometer speed display stability and a fast response to a large speed change of the monitored machinery.

To check or change the filter select FiLtEr in the configuration menu and press ( which will reveal the current settings with the first digit flashing. Pressing the & or * button will change the flashing digit and ( will transfer control to the second digit. While making adjustments the filtered Tachometer display is shown on the lower display in place of run-time so that stability can be assessed while adjustments are being made. When set as required, press the ) button to enter the revised parameters and return to the FiLtEr prompt in the configuration menu.

6.13 Clip-off: CLP oFF

Clip-off determines the displayed speed at which the run-time counter starts to function, below this threshold the run-time counter does not function. If the run-time counter is required to operate whenever the Tachometer is powered, clip-off should be set to zero.

If the run-time display is not being used it is not necessary to enter a clip-off value - see 6.8.

To check or change the clip-off threshold select

CLP oFF from the configuration menu and press ( which will reveal the current setting. The

threshold is shown in the units already selected for the Tachometer speed display with one digit flashing. The value of the flashing digit may be adjusted by pressing the & or * button, when set as required pressing ( will transfer control to the next digit. When all the digits have been adjusted, press the ) button to enter the revised threshold and return to the CLP oFF prompt in the configuration menu.

When the Tachometer speed display falls below the clip-off threshold, the HOLD annunciator will be activated and the run-time clock will be stopped.

Note:

To avoid confusion, when the speed scale factor 5CALE

. 5, timebase t-bA5E, or the

position of the speed display decimal point dp are changed, clip-off will automatically be reset to zero. A new clip-off threshold must be entered after any of these changes have been made.

6.14 Local reset: LoC clr

The Local reset function contains two sub-functions clr tot and clr gtot which when enabled allow the run-time display and grand total run-time to be reset to zero via the instrument push buttons while the Tachometer is in the display mode.

6.15 Local run-time reset: clr tot clr tot is a sub-menu in the LoC clr function

which when activated allows an operator to reset the run-time display to zero while the Tachometer is in the display mode by operating the & & * push buttons simultaneously for more than three seconds.

Select LoC clr in the configuration menu and press ( which will reveal the clr tot prompt, operate ( again which will show if the local run-time reset is on or oFF. If set as required operate the ) button twice to return to the configuration menu, or the & or * button to change the setting followed by the ) button twice to enter the change and return to the LoC

clr prompt in the configuration menu.

Note:

The run-time display may also be reset to zero remotely by connecting terminals RS1 and RS2 together for more than one second. See sections 3.5; 4.1.8 and 4.2.8 of this manual.

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6.16 Local grand total run-time reset: clr gtot

The grand total run-time is a separate timer that functions in parallel with the run-time display, but is not zeroed when the run-time display is reset to zero. The run-time grand total may be viewed in the display mode by pressing the ) and * buttons simultaneously.

Clr gtot is a sub-menu in the LoC clr function which when activated allows an operator to reset the grand total run-time to zero while the Tachometer is in the display mode by operating the ) and * push buttons simultaneously for more than ten seconds. See section 2.2

To check or change the function select LoC clr in the configuration menu and press ( which will reveal the

clr tot prompt. Using the & or * button select clr gtot and press ( which will show if the local

grand total reset is on or oFF. If set as required operate the ) button twice to return to the configuration menu, or the & or * button to change the setting followed by the ) button twice to enter the change and return to the LoC clr prompt in the configuration menu.

Note:

Once reset, the grand total run-time can not be recovered.

6.17 Grand total run-time reset from within the configuration menu: Clr

Gtot

The grand total run-time is a separate timer that is incremented in parallel with the run-time display, but is not zeroed when the run-time display is reset to zero. The grand total may be viewed in the display mode by pressing the ) and * buttons simultaneously.

The grand total can be reset to zero from within the configuration menu using this Clr

Gtot function.

To zero the grand total from within the configuration menu select Clr

Gtot and press ( which will cause

the instrument to display Clr

. no with no flashing.

Press the & or * push button until Clr

. YE5 is

displayed and then press ( which will result in a 0000 prompt being displayed with the first digit flashing. This is a request for the instruction to be confirmed by entering 5urE using the & or * button to adjust the flashing digit and the ( button to move control to the next digit. Pressing ) will then reset the grand total to zero and return the Tachometer to the configuration menu.

Note:

Once reset, the grand total run-time can not be recovered.

6.18 Security code: CodE

Access to the instrument’s configuration menu may be protected by a four digit security code which must be entered to gain access. New instruments are configured with the default security code 0000 which allows unrestricted access to all configuration functions.

To enter a new security code select CodE from the configuration menu and press ( which will cause the Tachometer to display 0000 with one digit flashing. The flashing digit may be adjusted using the & or * push button and the ( button to transfer control to the next digit. When all the digits have been adjusted press ) to return to the CodE prompt. The revised security code will be activated when the Tachometer is returned to the display mode.

Please contact BEKA associates sales department if the security code is lost.

6.19 Reset configuration to factory defaults:

r5Et Def

r5Et

Def resets the Tachometer configuration to the

factory default configurations shown in sections 6.0.

To reset the Tachometer to the factory default configurations select r5Et def from the configuration menu and press ( which will result in the instrument displaying 0000 with the first digit flashing. To confirm the instruction 5urE should be entered. Using the & or * button set the first flashing digit to 5 and press ( which will transfer control to the second digit which should be set to u. When 5urE has been entered pressing the ) button will reset all the configuration functions and return the instrument to the display mode.

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6.20 Pulse output

All BA314G Tachometers have an isolated open collector pulse output having the following parameters:

Ron = 60 + 3V Roff = 1M Imax = 10mA

The output pulse may be a synchronous duplicate of the input pulse or may be scaled and the pulse length extended.

6.20.1 Intrinsic safety

The pulse output is an optically isolated separate intrinsically safe circuit that has zero output safety parameters. The output therefore complies with the requirements for simple apparatus. This allows pulse output terminals P1 and P2 to be connected to any intrinsically safe circuit protected by a certified Zener barrier or galvanic isolator providing the output parameters do not exceed:

Uo = 28V dc Io = 200mA Po = 0.84W

The equivalent capacitance and inductance of the pulse output are both zero which allows the maximum permissible cable parameters specified by the certificate for the Zener barrier or galvanic isolator powering the pulse output circuit to be used.

6.20.2 System design

The Tachometer pulse output is a passive circuit i.e. not powered, but it is totally isolated from all other Tachometer circuits. Subject to complying with intrinsic safety interconnection requirements, the terminals P1 and P2 may be connected to another instrument which will accept an open collector input. The pulse output may also be transferred to the safe area via a galvanic isolator or a Zener barrier.

Fig 11 shows how a 2-channel Zener barrier may be used to produce a voltage pulse in the safe area that could be used to drive a safe area tachometer. The positive terminal of the pulse output circuit P1 is connected to the BA314G Tachometer’s positive supply terminal 1 at the instrument. When an output pulse occurs and the open collector 'closes', P2 is connected to P1 and a pulse output current flows through the diode return barrier to resistor R1 in the safe area. The current flowing in the circuit is determined by resistor R1 which should be chosen to limit the output current to less than 10mA. For a 24V supply R1 should therefore be greater than 2,200

Fig 11 Transferring pulse output to safe area using

Zener barriers

6.20.3 Configuration

The pulse output configuration sub-menu PuL5E

. oP

is shown in Fig 12. .

The pulse output sub-menu allows the source of the output pulse to be selected in the 5ourCE sub- function. For re-transmission applications the output pulse may be a synchronous duplicate of the input pulse by selecting dirECt in the 5ourCE sub- function.

When 5CALEd is selected, two additional functions, diVidE and durAtion are introduced into the sub- menu enabling the input pulse frequency to be divided to produce the output pulse frequency, and the output pulse width (duration) to be lengthened.

6.20.4 Access Pulse output sub-menu: PuL5E

. oP

Access the Tachometer configuration menu as described in section 6.2. Using the & and * push buttons scroll though the menu until PuL5E

. oP is

displayed, pressing ( will then access the pulse output sub-menu which is shown in Fig 12.

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Fig 12 Pulse output configuration sub-menu

6.20.5 Enable pulse output: EnbL

This function allows the pulse output to be disabled or enabled without altering any of the pulse output parameters. Using the & or * push button select EnbL in the pulse output sub-menu and press ( to reveal the existing setting on or oFF. The function can be changed by pressing the & or * push button followed by the ) button to return to EnbL.

6.20.6 Source of output pulse: 5ourCE

The output pulse may be derived from:

dirECt Synchronously re-transmitted

input pulse.

Output pulse is a duplicate of the Tachometer input pulse.

5CALEd Input pulse scaled prior to re-

transmission.

Input pulse frequency may be divided to produce output pulse with defined duration by the diVidE and durAtion functions.

Using the & or * push button select 5ourCE in the pulse output sub-menu and press ( to reveal the existing pulse source. The source can be changed by pressing the & or * push button followed by the ) button to return to 5ourCE prompt.

6.20.7 Divide output pulse frequency: diVidE

When 5CALEd is selected in the 5ourCE function described in section 6.20.6, the output pulse frequency is the Tachometer input pulse frequency divided by one the following:

100

1000

10000

Using the & or * push button select diVidE in the pulse output sub-menu and press ( to reveal the existing divisor. The value can be changed by pressing the & or * push button to select the required value followed by the ) button to return to diVidE prompt.

Note: This function only appears in the pulse

output sub-menu when 5CALEd is selected in the 5ourCE function.

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6.20.8 Define output pulse width: durAtion

When 5CALEd is selected in the 5ourCE function as described in section 6.20.6, the output pulse width in milliseconds is defined by this function. One of 11 pulse widths may be selected:

. 1

. 5

5 10 25 50

100 250 500

Using the & or * push button select durAtion in the pulse output sub-menu and press ( to reveal the existing pulse duration. The value can be changed by pressing the & or * push button to select the required value followed by the ) button to return to durAtion prompt.

Note: This function only appears in the pulse output

sub-menu when 5CALEd is selected in the 5ourCE function.

6.20.9 Pulse storage

If the diVidE and durAtion functions are configured such that the output pulse frequency with the specified pulse width can not be output in real time, the generated pulses will be stored and transmitted at the maximum possible speed.

When the total display is reset to zero or the power supply to the Tachometer is disconnected or turned off, any stored pulses will not be retained.

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7. CONFIGURATION EXAMPLE

In this example a BA314G Tachometer is connected to a proximity detector producing 105 pulses per revolution.

The BA314G is required to display rotational speed in RPM with a resolution of one RPM. The run-time clock is to operate when the shaft speed exceeds 5 RPM. The display is to be updated twice per second.

For this application the operator needs to reset the run-time display to zero from the display mode, but should not be able to reset the grand total run-time from the display mode. To prevent tampering the instrument configuration menu is to be protected by security code of 1209.

7.1 Configuration procedure

The BA314G Tachometer may be configured on-site without disconnection from the power supply or from the proximity detector.

Step 1 Enter the configuration menu

Enter the configuration menu by simultaneously pressing ( and ). Assuming a security code has not already been entered the instrument will respond by displaying inPut which is the first function in the configuration menu. See Fig 10.

Step 2 Select the type of input & debounce

With inPut displayed press ( which will reveal the sub-menu. Using the & or * button select inP

. tYPE and press ( to

reveal the current input. The Tachometer is required to work with a proximity detector so again using the & or * button select Pr.

dEt followed by ) to

return to the inP

. tYPE prompt in the sub-

menu. Using the & or * button select

dEbouncE from the sub-menu and press (. Using the & or * button select dEFAuLt which will provide moderate pulse

edge noise protection. If the Tachometer is subsequently found to miscount the noise rejection can be increased. Enter the selection and return to the inPut prompt in the configuration menu by pressing the ) button twice. See 6.4, 6.5 and 6.6

Step 3 Select the interval between display

updates

Using the & or * button select uPdAtE in the configuration menu and press ( to reveal how frequently the Tachometer display is updated.

Using the & or * push button select

. 5 (0.5 seconds i.e. 2 display updates

per second). Enter the selection and return to the uPdAtE prompt in the configuration menu by pressing the ) button. See 6.7

Step 4 Run-time display

Using the & or * button select di5P-2 in the configuration menu and press ( to select if the run-time display is on or oFF. The Tachometer is required to display run-time therefore using the & or * button select on and press ) to enter the selection and return to the di5P-2 prompt in the configuration menu. See 6.8

Step 5 Position of decimal point in speed

display.

Select dP from the configuration menu and press (. The speed display will be activated and identified by the Rate annunciator. Using the & or * push button position the decimal point to the right of the least significant digit to give a total display resolution of 1. Finally press the ) button to enter the selection and return to the dP prompt in the configuration menu.

See 6.9

Step 6 Enter the speed scale factor

5CALE.5 is a dividing factor adjustable between 0.0001 and 99999 that enables the Tachometer to display speed in the required engineering units. The speed display timebase is determined by t-bA5E that is adjusted in Step 7.

In this example the Tachometer speed display is required in revolutions per minute. The proximity detector produces 105 pulses per revolution therefore

5CALE

. 5 should therefore be adjusted to

105.0.

Using the & or * push button select 5CALE.5 from the configuration menu and press ( to reveal the existing value with one digit flashing. This should be changed to 105.0 using the & or * push button to adjust the flashing digit and the ( button to transfer control to the next digit and to position the decimal point. Finally, enter the new value and return to the 5CALE

. 5 prompt in the

configuration menu by pressing ). See 6.10

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Step 7 Enter the speed timebase

The speed timebase determines if the Tachometer displays speed per second, per minute or per hour. In this example revolutions per minute are required. Using the & or * push button select t-bA5E from the configuration menu and press (. Again using the & or * push button select tb-60 from the three options which will multiply the speed display by 60. Enter the selection and return to the t-bA5E prompt in the configuration menu by pressing ). See 6.11

Step 8 Adjust the display filter

The digital display filter has two independent adjustable parameters enabling the rate display response to be tailored for optimum performance. The filter parameters are controlled by a two digit number. The first digit defines the amount of filtering applied to the display, for initial configuration it is recommended it is set to 2 which is a time constant of 4.3 seconds. The second digit defines the deviation from the displayed speed at which the filtering, defined by the first digit, will be overridden and the Tachometer speed display will move rapidly to the new value. It is recommended that the second digit is initially set to 0.

After configuration both parameters may require further adjustment to provide a stable display with an acceptable step response.

To allow the effect of filter changes to be seen immediately, the live speed display is shown on the lower display in place of runtime while the filter parameters are shown and being adjusted on the upper display.

Using the & or * push button select FiLtEr from the configuration menu and press (. The first digit, which controls the filter time constant, will be flashing and should be set to 2 using the & or * push buttons. The ( button will transfer control to the second digit, which controls the step response and should be set to 0 in the same way. Finally, enter the selection and return to the FiLtEr prompt in the configuration menu by pressing ).

See 6.12

Step 9 Define clip-off

In this example the run-time clock is required to operate when the display speed equals or exceeds 5 RPM. The clip-off threshold should therefore be set to 5.

Using the & or * push button select Clp oFF from the configuration menu. Press ( which will reveal the current clip-off threshold in RPM i.e. the same units already selected for the speed display. Adjust the display to 00005 using the & or * push buttons to adjust the flashing digit and the ( button to transfer control to the next digit. Finally, enter the new clip-off threshold and return to the CLp-oFF prompt in the configuration menu by pressing ). See 6.13

Step 13 Local reset of total and grand total

Two separate functions in the LoC clr sub-menu may be individually activated to allow the operator to reset the run-time display and grand total run-time from the display mode without entering the configuration menu.

In this example the operator is required to reset the run-time display but not the grand total run-time when the BA314G Tachometer is in the display mode. Using the & or * button select LoC clr in the configuration menu and press ( which will reveal the sub-menu. Again using the & or * button select the local total reset function clr tot and press (. This is required therefore using the & or * button select on followed by ) to return to the clr tot prompt in the submenu.

Using the & or * button select the local grand total run-time reset function clr gtot and press (. This is not required therefore using the & or * button select oFF. Enter the selection and return to the Loc clr prompt in the configuration menu by pressing the ) button twice. See 6.15 and 6.16

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Step 14 Reset the grand total to zero

Before completing configuration the runtime grand total should be reset to zero. Using the & or * button select Clr

. Gtot

in the configuration menu and press ( which will cause Clr

. no to be displayed.

Again using the & or * button select

CLr YE5 and press ( which will result in a 0000 display with one digit flashing. This is

a request for the instruction to be confirmed by entering 5urE using the

& or * buttons to set each digit and the ( button to move control to the next digit.

Pressing ) will then reset the run-time grand total to zero and return the instrument to the Clr

. Gtot prompt in the

configuration menu. See 6.17.

Step 15 Define the security code

Defining a security code prevents unauthorised access to the configuration menu. Using the & or * button select CodE from the configuration menu and press ( which will reveal 0000 with the first digit flashing. This example requires the security code to be 1209, using the & or * button set the flashing digit to 1 and press ( to transfer control to the second digit. When all have been entered press ) to return to the main configuration menu. See 6.18.

Step 16 Return to the display mode

Configuration of the BA314G is now complete. Pressing the ) button will save the new configuration and return the Tachometer to the display mode. The BA314G will display dAtA followed by 5AVE while the new information is stored in permanent memory, which will be protected from unauthorised adjustment by the security code.

To obtain a stable display it may be necessary to adjust the two filter parameters and the level of debounce during commissioning of the Tachometer.

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8. MAINTENANCE

8.1 Fault finding during commissioning

If a BA314G Tachometer fails to function during commissioning the following procedure should be followed:

Symptom Cause Check:

No display No power supply,

or incorrect wiring. Note: Terminals 2,

6 & RS2 are

interconnected

within the

instrument.

That there is

between 10 and

28V on terminals 1

& 2 with terminal 1

positive.

Tachometer is

receiving power but

pulse input

indicator not

rotating

No input pulses,

incorrect input

configuration,

incorrect linking of

terminals 3 & 4.

Input configuration.

Linking of

terminals 3 & 4.

That input signal

polarity is correct.

Pulse input

indicator rotating,

but incorrect speed

display

Incorrect speed

display calibration.

5CALE

. 5

t-bA5E

Pulse input

indicator rotating

but missing or

incorrect

run-time display.

Run-time display is

not activated.

Tachometer speed

display is less than

clip-off value.

Remote reset

switch contacts

closed.

di5P-2 is activated

See 6.8

If HOLD

annunciator is

activated, enter

smaller Clip-off

value. See 6.13

That ‘RESET’

annunciator is not

activated. If it is,

check reset wiring

and switch.

Unstable

Tachometer

display.

Noisy pulse input

signal.

Eliminate source of

electrical noise. Increase debounce and/or display filter.

See 6.12

Unable to enter

configuration

menu.

Incorrect security

code.

That the correct

security code is

being used.

See 6.18

Contact BEKA if

code is lost.

Clip-off does not

function.

Clip-off has

automatically been

reset to zero

following

calibration change.

Reconfigure

clip-off.

See 6.13

Alarms do not

function.

Alarms have been

disabled following

calibration change.

Re-enable both

alarms.

See 9.3.4

8.2 Fault finding after commissioning

ENSURE PLANT SAFETY BEFORE

STARTING MAINTENANCE

Live maintenance is permitted on intrinsically safe equipment installed in a hazardous area, but only certified test equipment should be used unless a gas clearance certificate is available.

If a BA314G Tachometer fails after it has been functioning correctly, the following table may help to identify the cause of the failure.

Symptom Cause Check:

No display No power supply. That there is

between 10 and

28V on terminals

1 & 2.

Pulse input

indicator not

rotating.

No input pulses. Output from

sensor.

Wiring between

sensor and

Tachometer.

Pulse input

indicator rotating,

run-time display

not functioning.

HOLD annunciator

activated.

Input below

clip-off threshold.

Adjust Clip-off

threshold.

Unstable rate

display

Noisy pulse input

signal

Locate source of

electrical noise, or

increase

debounce and

rate display filter.

If this procedure does not reveal the cause of the fault, it is recommended that the instrument is replaced.

8.3 Servicing

We recommend that faulty BA314G Tachometers are returned to BEKA associates or to your local BEKA agent for repair.

8.4 Routine maintenance

The mechanical and electrical condition of the instrument should be regularly checked. Inspection frequency should be adjusted to suit the environmental conditions.

8.5 Guarantee

Instruments which fail within the guarantee period should be returned to BEKA associates or our local agent. It is helpful if a brief description of the fault symptoms is provided.

8.6 Customer comments

BEKA associates is always pleased to receive comments from customers about our products and services. All communications are acknowledged and whenever possible, suggestions are implemented.

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9. ACCESSORIES

9.1 Units of measurement & instrument identification.

New BA314G Tachometers are supplied with a printed scale card showing the units of measurement and tag information specified when the instrument was ordered. If this information was not supplied a blank scale card will be fitted which can easily be marked with a dry transfer or a permanent marker on-site.

Custom printed scale cards are available as accessories and may be easily fitted as shown in section 5.4 of this manual.

The BA314G can also be supplied with a blank or custom laser engraved stainless steel legend plate see Fig 7. The plate, which after installation is visible from the front of the instrument, is supplied loose with two fixing screws for securing it to the rear of the instrument's back-box. This plate can typically accommodate:

1 row of 5 alphanumeric characters 10mm high

or 1 row of 6 alphanumeric characters 7mm high

or 2 rows of 10 alphanumeric characters 5mm high

9.2 Display Backlight

The BA314G Tachometer can be supplied with a factory fitted backlight that produces green illumination enhancing display contrast and enabling it to be read at night or in poor lighting conditions. The backlight is internally powered from the instrument so that no additional wiring or intrinsically safe interface is required, but the instrument supply current increases to 32mA.

9.3 Alarms

The BA314G Tachometer can be supplied with factory fitted, dual isolated solid state single pole alarm outputs that may be independently configured.

Each may be configured as a speed or run-time alarm with a high or low function having a normally open or closed output. An alarm delay and alarm silence time can be included and hysteresis may be applied to speed alarms.

CAUTION These alarm outputs should not be used for critical safety applications such as a shut down system.

When the BA314G Tachometer power supply is turned off or disconnected, alarm outputs will open irrespective of whether normally open or normally closed outputs have been selected. When designing a system an open output should therefore be chosen for the alarm condition. Alarm annunciators on the instrument display indicate the status of each alarm. If an alarm delay or silence time has been selected the annunciator will flash during the delay or silence period.

The BA314G internal counters are up-dated and compared with the alarm setpoint twice per second, irrespective of the display update time selected. This may result in an alarm being delayed for up to half a second after speed or run-time has exceeded the alarm setpoint.

9.3.1 Solid state output

Each alarm has a galvanically isolated single pole solid state switch output as shown in Fig 13. The outputs are polarised and current will only flow in one direction. Terminals A1 and A3 should be connected to the positive side of the supply.

Ron = less than 5 + 0.7V Roff = greater than 1M

Note: Because of the series protection diode some

test meters may not detect a closed alarm output

Page 34

Fig 13 Equivalent circuit of each alarm output

9.3.2 Intrinsic safety

Each alarm output is a separate galvanically isolated intrinsically safe circuit with output safety parameters complying with the requirements for simple apparatus. This allows the alarm output terminals A1 & A2 and A3 & A4 to be connected to almost any intrinsically safe circuit protected by a Zener barrier or galvanic isolator providing the output parameters of the circuit do not exceed:

Uo 28V dc Io 200mA Po 0.84W

The maximum equivalent capacitance and inductance between each set of alarm terminals is:

Ci = 22nF Li = 4µH

To determine the maximum permissible cable parameters Ci should be subtracted from the maximum permitted external capacitance Co specified by the certificate for the intrinsically safe interface powering the alarm circuit, such as the solenoid driver and switch transfer galvanic isolators shown in Fig 14.

Fig 14 Typical alarm application

Page 35

9.3.3 Configuration and adjustment

When a BA314G is supplied with alarms the configuration menu is extended as shown in Fig 15 which for simplicity only shows alarm AL1 configured to operate as a speed alarm. The run-time options are identical except that a run-time alarm can not have hysteresis. Alarm AL2 functions are identical to alarm AL1.

The following table summarises each of the alarm configuration functions and includes a cross references to more detailed information. Again only the functions on alarm AL1 are listed.

Display Summary of function

EnbL Alarm enable

Enables or disables the alarm without changing the alarm parameters. See section 9.3.4

tYPE Type of alarm

Defines whether the alarm operates on the speed or run-time display. See section 9.3.5

5P1.5peed Alarm setpoint 1

or Adjusts the alarm setpoint. The

5P1.Hour5s alarm is activated when the speed or

run-time display equals the setpoint. Note: 5P15 is displayed for a speed alarm and 5P1H for a run-time alarm. See section 9.3.6

. LO Alarm function

Defines whether the alarm has a high or low function. See section 9.3.7

Display Summary of function

. nc Normally open or normally closed

output.

Determines whether the single pole alarm output is open or closed in the non-alarm condition. See section 9.3.8

H5tr Hysteresis

Adjusts the alarm hysteresis. Only available on a speed alarm. See section 9.3.9

dELA Alarm delay time

Adjusts the delay between the display equalling the setpoint and the alarm output being activated. See section 9.3.10

5IL Alarm silence time

Defines the time that the alarm output remains in the non-alarm condition following acceptance of an alarm. See section 9.3.11

FL5H Flash display when alarm occurs

When enabled, alternates the speed or run-time display between the value and alarm reference Al1 or Al2 when an alarm output is activated. See section 9.3.12

AC5P Access setpoint

Sub-menu that enables direct access to the alarm setpoints from the display mode and defines a separate security code. See section 9.3.13

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Page 37

9.3.4 Alarm enable: EnbL

This function allows the alarm to be enabled or disabled without altering any of the alarm parameters. Using the & or * push button select AL1 or AL2 from the configuration menu and press ( to access the alarm sub-menu. Press the & or * button until EnbL is displayed followed by ( which will reveal if the function is on or off. The setting can be changed by pressing the & or * push button followed by the

)

button to return to the alarm sub-menu.

9.3.5 Type of alarm: tYPE

Alarm 1 and Alarm 2 are totally independent, both may be speed or run-time alarms, or one may be conditioned for speed and the other for run-time. Using the & or * push button select tYPE from the selected alarm sub-menu and press ( to check or change the function. The & or * push button will toggle the selection between 5PEEd and Hour5, when set as required press the ) button to return to the alarm sub-menu.

Note: When tYPE is changed, the alarm

configuration is automatically reset to the default values and the alarm is disabled. It must therefore be reconfigured before use.

9.3.6 Setpoint adjustment: 5P1.x & 5P2.x

The speed alarm setpoints 5P1.5peed and 5P2.5peed may be positioned anywhere between 0000000 and 9999999, and the run-time alarm setpoint 5P1.Hour5 and 5P2.Hour5 anywhere between 0000.0 and 9999.9 hours.

All the setpoints are adjusted in the same way, for example, to adjust the setpoint of Alarm 1 which has been configured to operate on the speed display. Using the & or * push button select 5P1.5peed in the AL1 sub-menu and press ( which will reveal the existing setpoint with one digit flashing. The required setpoint can be entered using the & or * push button to adjust the flashing digit and the ( button to transfer control to the next digit. When set as required press ) to enter the value and return to the 5P1.5peed prompt in the alarm 1 sub-menu.

9.3.7 Alarm function:

Hi . Lo

Alarm 1 and Alarm 2 are totally independent, both may be Hi or Lo, or one may be conditioned as a Hi alarm and the other as a Lo alarm. Using the & or * push button select Hi

. Lo from the

selected alarm sub-menu and press ( to check or change the function. The & or * push button will toggle the alarm function between Hi and Lo, when set as required, press the ) button to return to the Hi

. Lo’ prompt in the alarm sub-menu.

9.3.8 Alarm output status: no

. nC

Each single pole alarm output may be open or closed in the non-alarm condition. When the BA314G or BA318E power supply is turned off or disconnected, the alarm output(s) will open irrespective of whether normally open or normally closed outputs have been selected. Therefore, when designing an alarm system normally closed nc should be selected so that the output opens when an alarm occurs or if the power supply fails.

Using the & or * push button select no

. nC from

the selected alarm sub-menu and press ( to check or change the function. The & or * push button will toggle the contact status between no and nC, when set as required, press the ) button to return to the no

. nC prompt in the alarm sub-menu

9.3.9 Hysteresis: H5tr

Hysteresis is only available on speed alarms so the H5tr function only appears in the configuration submenu when alarm tYPE has been set to 5PEEd. During configuration hysteresis is shown in the units of 5PEED previously configured for the Tachometer display.

Using the & or * push button select H5tr in the selected alarm sub-menu and press ( which will reveal the existing hysteresis with one digit flashing. The required hysteresis can be entered using the & or * push button to adjust the flashing digit and the ( button to transfer control to the next digit. When set as required press ) to enter the value and return to the H5tr prompt in the alarm submenu.

e.g. A Tachometer configured to display a rotational speed of 0 to 500 RPM, with a high alarm set at 400 RPM and hysteresis of 10 RPM will perform as follows:

The high alarm will be activated when speed equals or exceeds 400 RPM, but will not reset until the speed falls below 390 RPM.

9.3.10 Alarm delay: dELA

This function enables activation of the alarm output to be delayed for a fixed time following the alarm condition occurring. The delay can be set in 1 second increments up to 3600 seconds. If a delay is not required zero should be entered.

To adjust the delay select dELA using the & or * push button in the selected alarm sub-menu and press ( which will reveal the existing delay time in seconds with one digit flashing. The required delay time can be entered using the & or * push button to adjust the flashing digit and the ( button to transfer control to the next digit. When set as required press ) to enter the value and return to the dELA prompt in the alarm sub-menu.

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The alarm annunciator will start flashing immediately an alarm condition occurs and will continue for the delay time, after which the alarm output will be activated and the alarm annunciator will be permanently activated.

9.3.11 Alarm silence time: 5IL

The alarm silence function is primarily intended for use in small installations where the alarm output directly operates an annunciator such as a sounder. When the alarm silence time is set to any figure other than zero, the ( push button becomes an alarm accept button.

After an alarm has occurred, operating the ( button will cause the alarm output to revert to the non-alarm condition for the configured alarm silence time. When an alarm is silenced the alarm annunciator will flash until the silence time expires.

To adjust the alarm silence time select 5iL using the & or * push button in the selected alarm sub-menu and press ( which will reveal the existing alarm silence time in seconds with one digit flashing. The required delay time can be entered using the & or * push button to adjust the flashing digit and the ( button to transfer control to the next digit. When set as required press ) to enter the value and return to the 5iL prompt in the alarm sub-menu.

9.3.12 Flash display when alarm occurs: FL5H

In addition to the two alarm annunciators at the bottom left hand side of the Tachometer display which show the status of both alarms, this function provides an even more conspicuous indication that an alarm condition has occurred.

When enabled, this function alternates the speed or run-time display between the numerical value and the alarm identification AL1 or AL2 when an alarm occurs.

Using the & or * push button select FL5H from the selected alarm sub-menu and press ( to check or change the function. The & or * push button will toggle the function between oFF and on, when set as required, press the ) button to return to the FL5H prompt in the alarm sub-menu.

9.3.13 Access Setpoint: AC5P

This function activates a separate menu that provides direct access to the alarm setpoints when the Tachometer is in the display mode by simultaneously operating the ( and * buttons. An operator can therefore adjust the alarm setpoints without having access to the configuration and alarm sub-menus. Protection against unauthorised or accidental adjustment is provided by a separate security access code.

Using the & or * push button select AC5P from the configuration menu and press ( to reach the enable function EnbL. Pressing ( will reveal the existing setting which can be toggled between on and oFF by pressing the & or * push button. When set as required, press the ) button to return to the EnbL prompt from which a separate security access code can be entered using the ACCd function which can be selected using the & or * push button.

To enter a new security code select ACCd from the sub-menu and press ( which will cause the Tachometer to display 0000 with one digit flashing. The flashing digit may be adjusted using the & and * push button, when set as required operating the ( button will transfer control to the next digit. When all the digits have been adjusted press ) to return to the ACCd prompt. The revised security code will be activated when the Tachometer is returned to the display mode. Default security access code 0000 will disable the security code allowing direct access to the setpoints in the display mode by pressing the ( and * buttons simultaneously.

Please contact BEKA associates sales department if the security code is lost.

9.3.14 Adjusting alarm setpoints from the display mode

Access to the two alarm setpoints from the Tachometer display mode is obtained by operating the ( and * push buttons simultaneously as shown in Fig 16. If the setpoints are not protected by a security code the alarm setpoint prompt 5P1.5peed or 5P1.Hour5 will be displayed depending upon whether a speed or run-time alarm has been configured. If the setpoints are protected by a security code, CodE will be displayed first. Pressing ( again will allow the alarm setpoint security access code to be entered digit by digit using the

& or * buttons to adjust the flashing digit and the ( push button to move control to the next digit. If

the correct code is entered pressing ) will then cause alarm setpoint prompt 5P1.5peed or 5P1.Hour5 to be displayed. If an incorrect security code is entered, or a button is not pressed within ten seconds, the instrument will automatically return to the display mode. Once within the menu pressing the & or * buttons will toggle the display between the two alarm setpoint prompts 5P1x and 5P2x.

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Fig 16 Setpoint adjustment from the display mode

To adjust an alarm setpoint select 5P1x or 5P2x and press ( which will reveal the current setting. The flashing digit of the setpoint may be adjusted using the & or * push button and the ( button to transfer control to the next digit. When the required setpoint has been entered, pressing )

will return the display to the 5P1x or 5P2x prompt from which the other setpoint may be selected, or the instrument may be returned to the display mode by pressing ) again.

Note: Direct access to the alarm setpoints is only

available when the menu is enabled - see section 9.3.13

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9.4 4/20mA output

The BA314G Tachometer can be supplied with a factory fitted galvanically isolated 4/20mA output which may be configured to represent any part of the Tachometer speed display.

9.4.1 Intrinsic safety

The 4/20mA output has been certified as a separate galvanically isolated intrinsically safe circuit complying with the requirements for simple apparatus. This allows terminals C1 and C3 to be connected to any intrinsically safe circuit protected by a certified Zener barrier or galvanic isolator providing the output parameters do not exceed:

Uo = 28V dc Io = 200mA Po = 0.84W

The maximum equivalent capacitance and inductance of the pulse output is:

Ci = 2.2nF Li = 4µH

To determine the maximum permissible cable parameters, these figures should be subtracted from the maximum cable capacitance and inductance specified by the certificate for the Zener barrier or galvanic isolator powering the 4/20mA output circuit.

9.4.2 System design

The Tachometer 4/20mA output is a passive current sink i.e. not powered, but it is totally isolated from all other Tachometer circuits. It is effectively a 2-wire 4/20mA transmitter requiring a minimum supply of 5V with its current being controlled by the Tachometer speed display. Subject to complying with intrinsic safety interconnection requirements, the terminals C1 and C3 may be connected to another instrument, which will accept a 4/20mA transmitter input. The 4/20mA current output may also be transferred to the safe area via a galvanic isolator or Zener barriers. Terminals C2 and C4 are internally linked and may be used for joining a return 4/20mA wire.

Fig 17 shows how a 2-channel Zener barrier may be used to transfer the 4/20mA current output into the safe area, alternatively a galvanic isolator may be used.

Fig 17 Application of 4/20mA output

9.4.3 Configuration and calibration

When a Tachometer is supplied with an optional 4/20mA output the configuration menu is extended as shown in Fig 18. The 4/20mA output sub-menu is accessed via the 4-20 oP function.

The 4/20mA output is controlled by the Tachometer speed display, the speeds corresponding to 4 and 20mA output are defined in the sub-menu.

Fig 18 4/20mA output configuration sub-menu

Page 41

9.4.4 Access 4/20mA output sub-menu: 4-20 oP

Access the Tachometer configuration menu as described in section 6.2. Using the & and * push buttons scroll though the menu until 4-20 oP is displayed, pressing ( will then access the 4/20mA output sub-menu which is shown in Fig 18.

9.4.5 Enable 4/20mA output: EnbL

This function allows the 4-20mA output to be enabled or disabled without altering any of the output parameters. Using the & or * push button select EnbL in the 4-20 op sub-menu and press ( which will reveal the existing setting on or oFF. The function can be changed by pressing the & or * push button followed by the ) button to return to EnbL prompt in the sub-menu.

9.4.6 Display which corresponds to 4mA output: 4

. 000

The Tachometer speed display which corresponds to a 4.000mA output current is defined by this function. Using the & or * push button select 4

. 000 in the

4/20mA output sub-menu and press ( to reveal the existing speed display with one digit flashing. The required display can be entered using the & or * push button to adjust the flashing digit and the ( button to transfer control to the next digit. When set as required, press ) to enter the value and return to the 4

. 000 prompt in the 4/20mA output sub-menu.

9.4.7 Display which corresponds to 20mA output: 20

. 000

The Tachometer display which corresponds to a

20.000mA output current is defined by this function. Using the & or * push button select 20

. 000 in the

. 000 prompt in the 4/20mA output sub-menu.

Notes:

1. If the Tachometer calibration is changed the

4/20mA output will automatically be set to

3.5mA irrespective of the speed display. The 4/20mA output should always be reconfigured following changes to the Tachometer configuration.

2. If the Tachometer and the 4/20mA current sink output are powered from separate supplies, the 4/20mA output current will continue to flow when the Tachometer supply fails or is turned off. Powering both from a common supply eliminates this effect.

Page 42

APPENDIX 1

ATEX Dust Certification

A1.0 ATEX dust certification

In addition to ATEX certification permitting installation in explosive gas atmospheres which is described in the main section of this instruction manual, the BA314G Tachometer also has ATEX dust certification.

A1.1 Zones, and Maximum Surface

Temperature.

The BA314G has been certified Group II Category 1D Ex ia IIIC T80°C Da Ta = -40º to 60ºC. When connected to a suitable system it may be installed in:

Zone 20 explosive atmosphere in the form of a

cloud of combustible dust in air is continuously present, or for long periods or frequently.

Zone 21 explosive atmosphere in the form of a

cloud of combustible dust in air is likely to occur occasionally in normal operation.

Zone 22 explosive atmosphere in the form of a

cloud of combustible dust in air is not likely to occur in normal operation, but if it does occur, will only persist for a short period.

Be used with dust in subdivisions:

IIIA combustible flyings IIIB non-conductive dust IIIC conductive dust

Having a Minimum Ignition Temperature of:

Dust cloud 120°C

Dust layer on Rate 155°C Totaliser up to 5mm thick

Dust layer on Rate Refer to Totaliser over 5mm thick. EN 60079-14

At an ambient temperature between -40 and +60°C

A1.2 Installation and maintenance

The installation requirement described in this manual for use in a gas potentially explosive atmospheres also apply when the Tachometer is installed in a dust potentially explosive atmosphere.

The instrument assembly should only be removed from the enclosure back-box when dust can not enter the instrument enclosure. Before replacing the instrument assembly the sealing gasket should be inspected to ensure that it is undamaged and free from foreign bodies.

It is good practice to prevent dust accumulating on the Tachometer enclosure. If this can not be avoided, care should be taken to ensure that the layer thickness does not exceed 5mm for dusts having a minimum ignition temperature of 155°C.

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APPENDIX 2

IECEx certification

A2.0 The IECEx Certification Scheme

IECEx is a global certification scheme for explosion protected products which aims to harmonise international certification standards. For additional information about the IECEx certification scheme and to view the BEKA associate certificates, please visit www.iecex.com

A2.1 IECEx Certificate of Conformity

The BA314G Tachometer and the optional accessories have been issued with an IECEx Certificate of Conformity number IECEx ITS 16.0004X which specifies the following certification codes:

Ex ia IIC T5 Ga Ta = -40°C to 70°C Ex ia IIIC T80°C IP66 Da Ta = -40°C to 60°C

The specified IECEx gas and dust intrinsic safety parameters are identical to the ATEX safety parameters described in the main section and Appendix 1 of this manual.

The IECEx certificate may be downloaded from the BEKA associate ot the IECEx websites or requested from the BEKA sales office.

A2.2 Installation

The IECEx intrinsic safety parameters are identical to the ATEX safety parameters described in the main section of this manual and both refer to the same standards. Therefore the ATEX installation requirements specified in section 5 of this manual may be used for IECEx installations, but the local code of practice should also be consulted.

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APPENDIX 3

ETL & cETL certification for installations in USA and Canada.

A3.0 cETL Mark

For installations in the USA and Canada, the BA314G Tachometer has ETL and cETL intrinsic safety and nonincendive approval, Control Number 4008610. Copies of the Authorisation to Mark may be downloaded from the BEKA associates website

www.beka.co.uk

or requested from the BEKA

associates sales office

A3.1 Intrinsic safety approval

The US and Canadian standards used for assessment and certification of the BA314G are listed on the cETL Authorisation to Mark.

Installations must comply with BEKA associates Control Drawing CI330-52, which is attached to this appendix.

The ETL safety parameters are the same as the ATEX and IECEx parameters, the systems shown in sections 3 and 4 of this manual may therefore also be used for US and Canadian installations subject to compliance with the local codes of practice.

ETL and cETL intrinsic safety codes

USA & Canada

CL I Div 1 Groups A, B, C, D T5 CL II Div 1 Groups E, F, G. CL III

-40ºC < Ta < 70ºC

USA

CL I Zone 0 AEx ia IIC T5 Ga Zone 20 AEx ia IIIC T80ºC Da

-40ºC < Ta < 70ºC

Canada

Ex ia IIC T5 Ga Ex ia IIIC T80ºC Da

-40ºC < Ta < 70ºC

A3.2 Nonincendive approval

The BA314G Tachometer also has ETL nonincendive approval allowing installation in Division 2 hazardous (classified) locations without the need for Zener barriers or galvanic isolators.

Installations must comply with BEKA associates Control Drawing CI330-53, which is attached to this appendix, and with the local codes of practice.

ETL and cETL nonincendive codes US & Canada

CL I Div 2 Groups A, B, C, D T5 CL II Div 2 Groups F, G CL III Div 2

-40ºC < Ta < 70ºC

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APPENDIX 4

BA314E Tachometer

The BA314E Tachometer is functionally identical to the BA314G Tachometer described in the main sections of this manual, but differs in mechanical construction, certification and factory fitted options.

All BA314E Tachometers are fitted with:

A Green internally powered display backlight

Dual galvanically isolated alarms

An isolated 4/20mA current sink output

These are only available as factory fitted options for the BA314G Tachometer.

A4.1 Mechanical construction

The BA314E is housed in a robust GRP IP66 enclosure with a separate terminal compartment. Section A4.5 of this appendix describes the enclosure and installation procedure.

A4.2 Certification

The BA314E has the same ATEX, IECEx and ETL intrinsic safety certification as the BA314G, but the

BA314E does not have ATEX and IECEx dust certification.

The safety parameters and certification numbers specified in this manual for the BA314G Tachometers also apply to the BA314E Tachometer. Therefore all of the systems described for the BA314G in the main section of this manual may also be used for the BA314E.

A4.3 Location

The BA314E Tachometer is housed in a robust IP66 glass reinforced polyester (GRP) enclosure incorporating an armoured glass window and stainless steel fittings. It is suitable for exterior mounting in most industrial installations, including off-shore and waste water treatment sites. The Tachometer should be positioned where the display is not in continuous direct sunlight.

The field terminals and the two mounting holes are located in a separate compartment with a sealed cover allowing the instrument to be installed without exposing the display assembly.

The enclosure is fitted with a bonding plate to ensure electrical continuity between the three conduit / cable entries.

A4.4 BA314E Accessories

A4.4.1 Units measurement & instrument

identification.

The BA314E is fitted with a blank escutcheon around the liquid crystal display. This can be supplied printed with any units of measurement and tag information specified at the time of ordering. Alternatively, the information may be added on-site via an embossed strip, dry transfer or a permanent marker.

To gain access to the escutcheon remove the terminal cover by unscrewing the two 'A' screws which will reveal two concealed 'D' screws. Remove the push buttons by unscrewing the two 'C' screws and un-plug the five way connector. Finally, unscrew all four 'D' screws and carefully lift off the front of the instrument. The location of all the screws is shown in Fig A4.1.

Add the required legend to the display escutcheon, or stick a new pre-printed self-adhesive escutcheon, which is available from BEKA associates, on top of the existing escutcheon. Do not remove the original escutcheon.

The BA314E can also be supplied with a blank or custom laser engraved stainless steel plate secured by two screws to the front of the instrument enclosure. This plate can typically accommodate:

1 row of 9 alphanumeric characters 10mm high

or 1 row of 11 alphanumeric characters 7mm high

or 2 rows of 18 alphanumeric characters 5mm high.

A4.4.2 Pipe mounting kits

The BA314E Tachometer is surface mounting, but may be pipe mounted using the BA392D or the BA393 pipe mounting kit.

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A4.5 Installation Procedure

Fig A4.1 illustrates the instrument installation procedure.

a. Remove the instrument terminal cover by

unscrewing the two captive 'A' screws.

b. Mount the instrument on a flat surface and

secure with screws or bolts through the two 'B' holes. Alternatively secure to a vertical or horizontal pipe using a BA392D or BA393 pipe mounting kit.

c. Remove the temporary hole plug and install an

appropriate IP rated cable gland or conduit fitting. If more than one entry is required, one or both of the IP66 stopping plugs may be replaced with an appropriate IP rated cable gland or conduit fitting.

d. Connect the field wiring to the terminals as

shown in Fig A4.2.

7 Replace the instrument terminal cover and

evenly tighten the two 'A' screws.

If the BA314E is not bolted to an earthed post or structure, the earth terminal should be connected to the plant potential equalising conductor.

Fig A4.1 BA314E installation procedure

Fig A4.2 Dimensions and terminal connections

A4.6 EMC

The BA314E compies with the requirements of the European EMC Directive 2014/30/EU. For specified immunity all wiring should be in screened twisted pairs, with the screens earthed in the safe area.