BEKA BA317NE User manual

Issue: 7
9th July 2019
BA317NE
Rugged one input
Ex nA and Ex tc
Tachometer
Issue 7

1. Description
2. Operation
2.1 Initialisation
2.2 Controls
2.3 Displays
3. Certification
3.1 ATEX Ex nA certification
3.2 Zones, gas groups & T rating
3.3 Special conditions for safe use
3.4 Power supply
3.5 Pulse input
3.6 Remote reset terminals
3.7 Certification label information
4. System Design for Hazardous Areas
4.1 Power supply
4.2 Pulse input
4.2.1 Input switching thresholds
4.2.2 Switch contact input
4.2.3 Open Collector input
4.2.4 2-wire proximity detector input
4.2.5 Magnetic pick-off input
4.2.6 Voltage pulse input
4.3 Remote reset
5. Installation
5.1 Location
5.2 Installation procedure
5.3 Tachometer earthing
5.4 EMC
5.5 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
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
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CONTENTS
The BA317NE is CE marked to show compliance with the European Explosive Atmospheres Directive
2014/34/EU and the European EMC Directive 2014/30/EU

9. Accessories
9.1 Scale card
9.2 Tag information
9.3 Display backlight
9.4 Alarms
9.4.1 Solid state output
9.4.2 Ex nA certification
9.4.3 Configuration & adjustment
9.4.4 Alarm enable: EnbL
9.4.5 Type of alarm: tYPE
9.4.6 Setpoint adjustment: 5P1x & 5P2x
9.4.7 Alarm function: Hi .Lo
9.4.8 Alarm output status: no .nC
9.4.9 Hysteresis: H5tr
9.4.10 Alarm delay: dELA
9.4.11 Alarm silence time: 5IL
9.4.12 Flash display when alarm occurs:
FL5H
9.4.13 Access Setpoint: AC5P
9.4.14 Adjusting alarm setpoints
from display mode.
9.5 Pulse Output
9.5.1 Ex nA certification
9.5.2 Pulse output configuration
9.5.3 Enable pulse output: EnbL
9.5.4 Source of output pulse: 5ourCE
9.5.5 Divide output pulse frequency:
diVidE
9.5.6 Define output pulse width: durAtion
9.5.7 Pulse storage
9.6 4/20mA output
9.6.1 Ex nA certification
9.6.2 Configuration
9.6.3 Access 4/20mA output sub-menu:
4-20 oP
9.6.4 Enable 4/20mA output: EnbL
9.6.5 Display which corresponds to 4mA
output: 4.000
9.6.6 Display which corresponds to 20mA
output: 20 .000
Appendix 1 ATEX Dust certification
Appendix 2 IECEx certification
Appendix 3 ETL and cETL certification
3
CONTENTS CONTINUED

4

1. DESCRIPTION
This rugged Ex nA and Ex tc certified, one input
Tachometer is primarily intended for measuring and
displaying rotational speed within a Zone 2 or Zone 22
hazardous area without the need for Zener barriers or
galvanic isolators. To assist with routine maintenance,
it also includes a run-time clock that records the
number of hours that the monitored machinery has
been operating.
This instruction manual supplements the abbreviated
instruction sheet supplied with each instrument.
The BA317NE has been certified Ex nA and Ex tc for
use in gas and dust hazardous areas by Notified Body
Intertek Testing and Certification Ltd and complies
with the European ATEX Directive 2014/34/EU. It has
a rugged stainless steel enclosure and an impact
resistant glass window. In addition to normal Ex nA
and Ex tc applications, the certification allows it to be
installed in an Ex e, Ex n, Ex p or Ex t panel enclosure
without invalidating the enclosure's certification.
For international applications the BA317NE also has
IECEx certification which is described in Appendix 2.
For applications in the USA and Canada the
BA317NE has ETL and cETL certification which is
described in Appendix 3.
2. OPERATION
Fig 1 shows a simplified block diagram of the
BA317NE Tachometer. The instruments 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 BA317NE 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.
Factory fitted optional accessories are shown below:
Backlight
Isolated dual alarms
or
Isolated 4/20mA output
or
Isolated pulse output
Only one output option may be fitted
Fig 1 BA317NE
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
run-time total.
5

2.2 Controls
The BA317NE 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
& + * To reset run-time to zero press buttons
simultaneously for three seconds or
longer. This is a configurable function.
See 6.15
)
+ *To reset grand total run-time to zero
press buttons simultaneously for ten
seconds or longer. 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
- 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 BA317NE has two digital displays and
associated annunciators, plus a pulse input indicator
as shown on front cover of this manual.
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.
RTx Retransmitted pulse
annunciator annunciator.
Depends upon the setting of
5ource in the pulse output
configuration menu.
5caled:
Annunciator activated each
time pulse output open
collector is on, i.e. Ron is
less than 60+ 3V.
direct:
Annunciator continuously
activated.
6

3. CERTIFICATION
The BA317NE has ATEX and IECEx Ex nA gas and
Ex tc dust certification. The main sections of this
instruction manual describes ATEX gas certification.
ATEX dust certification is described in Appendix 1 and
IECEx gas and dust certification in Appendix 2.
3.1 ATEX Ex nA certification
Notified Body Intertek Testing and Certification Ltd
have issued the BA317NE with a Type Examination
Certificate number ITS16ATEX48409X. This has
been used to confirm compliance with the European
ATEX Directive for Group II, Category 3G equipment.
The instrument carries the Community Mark and,
subject to local codes of practice, may be installed in
any of the European Economic Area (EEA) member
countries and in the EEA EFTA states, Iceland,
Liechtenstein and Norway. ATEX certificates are also
acceptable in Switzerland and Turkey. The European
Commission's Blue Guide lists the member states,
overseas countries and territories that have adopted
harmonisation legislation.
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 Tachometer has been certified as Group II
Category 3G Ex ic nA IIC T5 Gc –40°C Ta +60°C
apparatus. This is non-sparking apparatus complying
with EN 60079-15 Equipment protection by type of
protection 'n' that minimises the risk of arcs or sparks
capable of creating an ignition hazard occurring during
conditions of normal operation.
The Tachometer's front panel push button contacts
are non incendive and have been certified intrinsically
safe Ex ic, without the need for an external Zener
barrier or galvanic isolator, as shown on the Type
Examination Certificate. This allows the Tachometer
to be adjusted and configured live when installed in a
Ex n panel enclosure located in Zone 2.
When connected to a suitable system and correctly
mounted in a panel enclosure complying with the
requirements for Type of protection 'n', the panel
enclosure containing the BA317NE Tachometer may
be installed in:
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 safely be used with equipment
having a temperature classification of:
T1 450oC
T2 300oC
T3 200oC
T4 135oC
T5 100oC
At ambient temperatures between -40 and +60oC.
This allows use with all commonly used industrial
gases except carbon disulphide CS2.
3.3 Special conditions for safe use
Special conditions for safe use are specified by the
Ex nA certificate indicated by the certificate number's
'X' suffix. These state that the BA317NE
Tachometer should be:
a. Mounted such that the instrument terminals
are protected by at least an IP54 enclosure
certified to IEC 60079-0 or IEC 60079-15 as
appropriate.
b. Be supplied from limited energy circuits with
output parameters in normal operation equal
to, or less than the instruments input
parameters.
These special conditions for safe use can be
satisfied by mounting the BA317NE in an Ex n, Ex e
or Ex p panel enclosure. For ATEX Category 3
installations in Zone 2, self or third party certified
Ex n, Ex e or Ex p panel enclosures may be used.
Additional requirement apply for non-metallic panel
enclosures.
3.4 Power supply
The input safety parameters for the power supply
terminals 1 and 2 are:
Ui = 30dc
Ii = 100mA
This allows the BA317NE to be powered from any dc
supply which in normal operation has an output
voltage of less than 30V. See section 4.1 for power
supply recommendations.
7

3.5 Pulse input
The BA317NE Tachometers 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 BA317NE connects an internal 7V, 6mA supply to
the input terminals. Energising is not required when
the Tachometer input is connected to a voltage pulse
source.
Fitting an external link between terminals 3 & 4
changes the Tachometer's pulse input safety
parameters in normal operation as shown below. This
table also shows the types of sensor requiring
energising (link fitting).
Safety parameters
Input Output
Type of input Link 3 & 4 Ui Uo Io
Switch contact Yes 15V 10.5V 9.2mA
Proximity detector Yes 15V 10.5V 9.2mA
Open collector Yes 15V 10.5V 9.2mA
Magnetic pick-off No 30V 1.1V 0.5mA
Voltage input (low) No 30V 1.1V 0.5mA
Voltage input (high) No 30V 1.1V 0.5mA
3.6 Remote reset terminals
The BA317NE total display my 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 safety parameters in
normal operation:
Ui = 30V
Uo = 3.8V
Io = 1mA
3.7 Certification label information
The Tachometer certification information label is fitted
in a recess on the top outer surface of the enclosure.
It shows the ATEX and IECEx certification information
plus BEKA associates name, location, year of
manufacture and the instrument serial number.
BA317NE Certification information label
4. SYSTEM DESIGN FOR HAZARDOUS AREAS
When correctly installed in Zone 2 the BA317NE
Totaliser may be connected to almost any apparatus
in the safe area and to Ex n, Ex e, Ex p and Ex d
protected apparatus located in Zone 2. Because
the BA317NE is not certified intrinsically safe it
should not be connected to an intrinsically safe
system.
BEKA Application Guide AG310, Guide for
Installation of [extra low voltage d.c.] Ex nA
instrumentation, which can be downloaded from
www.beka.co.uk, contains explanations and
recommendations for the installation of Ex nA
equipment.
In addition to being able to be connected to other
equipment in the safe area and in Zone 2, the
BA317NE may also be connected to suitably
protected and certified equipment located in Zone 1.
This is illustrated in Fig 5 and explained in
Application Guide AG310.
There are four design requirements:
1. The BA317NE must be installed in a panel
enclosure complying with the requirements for
Ex n protection as shown in section 5 of this
manual.
2. The BA317NE should be powered from a
circuit that has output safety parameters in
normal operation equal to, or less than, the
input safety parameters for terminals 1 and
2 specified by the BA337NG ATEX Type
Examination Certificate.
3. Hazardous area apparatus to which the
BA317NE is connected should be protected
by a technique suitable for the Zone in
which the equipment is located such as Ex n
or Ex e if located in Zone 2. Equipment
protected by intrinsic safety should not be
connected to a BA317NE.
4. Wiring should comply with Clause 9 of
EN 60079-14.
When designing a system it is important to
remember that terminals 2, 6 and RS2 are
interconnected within the BA317NE. See Fig 1.
8

4.1 Power supply
The BA317NE Totaliser require a minimum of 10V
between terminal 1 & 2 and consumes:
10mA without optional backlight
plus 6mA when terminals 3 & 4 are linked
A 24V dc regulated supply with a current limit located
in a safe area is suitable. The power supply should
meet the requirements for personnel safety so that
‘live maintenance’ can safely be performed. The
implicit requirement for galvanic isolation from the
mains supply ensures that the possible difficulties
from circulating earth currents caused by mains faults
is minimised. In European terms if the power supply
is CE marked it is almost certainly acceptable.
To comply with the requirements of EN 60079:14
Electrical installations design, selection and erection,
each of the wires entering the hazardous area should
be individually fused and contain a means of isolation.
These two requirements may be satisfied by using
DIN rail mounted terminals incorporating an easily
removable fuse which can be extracted to achieve
isolation as shown in Fig 2. Clear identification of,
and easy access to the means of isolation is essential
for their effective use. It is also necessary to ensure
that the maintenance procedure makes sure that
unauthorised re-closure of the switches does not
occur. It is not considered necessary to have a means
of isolation or electrical protection for the screen.
Fig 2 DIN rail mounting terminals incorporating a fuse
For some applications Ex nA instrumentation
energised by a current limited power supply or
instrument that can be switched off, is considered
adequate and to comply with the requirements of the
standard.
4.2 Pulse input
The BA317NE can display speed and run-time from a
wide variety of pulse outputs speed sensors located in
a Zone 2 hazardous areas or in a safe area.
Fig 3 shows the connections when the sensor is
located in Zone 2 and Fig 4 the connections required
when the sensor is in a safe area.
Fig 3 Connections for sensor in Zone 2
Fig 4 Connections for sensor in safe area
Providing the BA317NE Tachometer is correctly
installed in an Ex n panel enclosure located in Zone
2, the input terminals may be connected to a
certified speed sensor located in Zone 1 as shown in
Fig 5. The speed sensor should have Ex e or Ex d
certification permitting installation in Zone 1.
Intrinsically safe Ex i certified flowmeter sensors
should not be used.
9

Fig 5 Connection to an Ex d or Ex e sensor in Zone 1
4.2.1 Input switching thresholds
For reliable operation the Tachometer pulse input
must fall below the lower threshold and rise above the
upper thresholds shown in the following table.
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
Speed sensors with a switch contact, proximity
detector or an open collector output require energising
which is achieved by linking Totaliser terminals 3
and 4.
4.2.2 Switch contact input
Any mechanically or magnetically activated switch
contact speed sensor located in Zone 2 or in the safe
area may be directly connected to the pulse input
terminals 5 and 6 which are non incendive, providing
the sensor and associated wiring can withstand a
500V rms insulation test to earth. Most magnetically
activated reed relays comply with these requirements.
The BA317NE contains a configurable debounce
circuit to prevent contact bounce being counted. See
section 6.7.
4.2.3 Open collector input
Open collector sensors located in Zone 2 or in the
safe area may be directly connected to input terminals
5 & 6 providing the sensor and associated wiring can
withstand a 500V rms insulation test to earth.
The BA317NE contains a configurable debounce
circuit to prevent false triggering. See section 6.7.
4.2.4 2-wire proximity detector input
Most Zone 2 certified NAMUR 2-wire proximity
detectors may be directly connected to a BA317NE
input terminals 5 & 6, providing the minimum
operating voltage of the proximity detector is greater
than 7.5V. The sensor and the associated wiring
should be able to withstand a 500V rms insulation
test to earth.
The BA317NE contains a configurable debounce
circuit to prevent false triggering. See section 6.7.
4.2.5 Magnetic pick-off input
Magnetic pick-off speed sensors usually have a low
level ac voltage output which a BA317NE
Tachometer can sense when configured for a CoiL
input. The Tachometer input terminals 5 and 6 may
be connected to any Zone 2 certified magnetic pick-
off output sensor, providing the output in normal
operation is equal to or less than 30V the Totaliser's
Ui. The sensor and associated wiring should be
able to withstand a 500V rms insulation test to earth.
The BA317NE contains a configurable debounce
circuit to prevent false triggering. See section 6.7.
4.2.6 Voltage pulse input
Two voltage pulse input ranges are selectable in the
BA317NE Tachometer configuration menu, VoLt5 L
and VoLt5 H. The Tachometer input terminals 5 and
6 may be connected to any Zone 2 certified voltage
pulse output sensor, providing the output in normal
operation is equal to or less than 30V the Totaliser's
Ui. The sensor and associated wiring should be
able to withstand a 500V rms insulation test to earth.
The BA317NE contains a configurable debounce
circuit to prevent false triggering. See section 6.7.
4.3 Remote reset
The BA317NE Tachometer's run-time display may
be remotely reset to zero by connecting terminals
RS1 and RS2 together. Permanent interconnection
inhibits the run-time clock. Remote resetting may be
accomplished by any mechanically operated switch
located in Zone 2 as the Tachometerr's reset circuit
is non incendive. The reset switch and the
associated wiring should be able to withstand a
500V rms insulation test to earth.
A BA317NE may also be remotely reset from the
safe area. Any switch may be used. Fig 4 illustrates
how a BA317NE may be reset from both the safe
and the hazardous area.
The BA317NE run-time display may also be reset
when the &and *push buttons are operated
simultaneously in the operating mode i.e. when the
instrument is displaying speed. See 6.19
10

5. INSTALLATION
5.1 Location
When installed in a panel enclosure complying with
the requirements for Ex n protection as shown in
section 3.2 of this manual, the BA317NE may be
located in a Zone 2 hazardous area providing that the
operating temperature is between –40°C and +60°C
and the installation complies with the Tachometers
certification requirements. Certified Ex e panel
enclosures are frequently used as Ex n panel
enclosures.
The BA317NE Tachometer has a stainless steel
housings with a 7J front of panel impact resistance
incorporating a 10mm thick toughened glass window
which can withstand a 4J impact. This, together with
a captive silicone gasket which seals the joint
between the instrument and the panel, enclosure
provides IP66 ingress protection. The BA317NE has
IP20 rear protection.
Although the front of the BA317NE Tachometer has
IP66 protection, it should be shielded from continuous
direct sunlight and severe weather conditions.
Fig 6 shows the overall dimensions of the BA317NE
together with the recommended panel enclosure cut-
out dimensions.
5.2 Installation Procedure
a. Cut the aperture specified in Fig 6 into the panel
enclosure. Ensure that the edges of aperture are
de-burred.
b. Inspect the Tachometer's captive gasket and
ensure that it is not damaged before inserting it into
the panel enclosure aperture.
c. If the enclosure panel is less than 1.0mm thick, or is
non-metallic, an optional BEKA stainless steel
support plate should be slid over the rear of the
indicator before the panel clamps are fitted to
evenly distribute the clamping force and prevent the
enclosure panel being distorted or creeping.
d. Slide a panel clamp into the two grooves at each
corner of the indicator housing with the M3 stud
protruding through the hole at the rear of the clamp.
Fit the stainless steel spring washer over the stud
and secure with the stainless steel wing nut.
e. Evenly tighten the four clamps to secure the
instrument. The recommended minimum tightening
torque for each wing nut is 22cNm (1.95 lbf in).
f. Connect the panel enclosure wiring to the rear
terminal blocks. To simplify installation, the
terminals are removable so that wiring can be
completed before the instrument is installed. Wiring
should be supported to prevent damage resulting
from vibration.
g. Finally, fit a silicone rubber push-on cap to the end
of each M3 threaded rod.
Support panel wiring to prevent vibration damage
Note: Optional backlight is internally powered
Fig 6 BA317NE dimensions and terminals
11

Fig 7 Installation procedure
5.3 Tachometer earthing
The BA317NE has an M4 earth stud on the rear panel
which should be electrically connected to the panel
enclosure in which the Tachometer is mounted, or to
the plant equipotential conductor.
5.4 EMC
The BA317NE 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 in the safe area.
Fig 8 Rear terminals
5.5 Scale card
The Tachometer's units of measurement are shown
on a printed scale card in a window at the right hand
side of the display. The scale card is mounted on a
flexible strip that is inserted into a slot at the rear of
the instrument as shown in Fig 9. Thus the scale
card can easily be changed without dismantling the
indicator or removing it from the Ex n enclosure in
which it is mounted.
New Tachometers are supplied with a printed scale
card showing the requested units of measurement, if
this information is not supplied when the instrument
is ordered a blank card will be fitted.
A pack of self-adhesive scale cards printed with
common units of measurement is available as an
accessory from BEKA associates. Custom printed
scale cards can also be supplied.
To change a scale card, unclip the protruding end of
the flexible strip by gently pushing it upwards and
pulling it out of the enclosure. Peel the existing
scale card from the flexible strip and replace it with a
new printed card, which should be aligned as shown
below. Do not fit a new scale card on top of an
existing card.
Install the new scale card by gently pushing the
flexible strip into the slot at the rear of the
Tachometer, when it reaches the internal end-stop
secure it by pushing the end of the flexible strip
downwards so that the tapered section is held by the
Tachometer rear panel.
Align the self-adhesive printed
scale card onto the flexible strip
and insert the strip into the
indicator as shown below.
Fig 9 Inserting flexible strip carrying scale card
into slot at the rear of Tachometer.
12

6.0 CONFIGURATION & CALIBRATION
The BA317NE 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 11.
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 output or
4/20mA output are included, additional functions
appear in the configuration menu, which are described
separately in section 9.
All new Tachometers 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 0000 .0
Speed scale factor 5CALE .5 001 .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 10 shows the BA317NE 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 clock 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 10 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 (and )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 button. The
configuration menu is shown diagrammatically in
Fig 11.
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.
13

6.3 Summary of configuration functions
This section summarises all the configuration
functions. When read in conjunction with Fig 11 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:
oP .CoL Open collector *
VoLt5 L Voltage pulse <1 >3V
VoLt5 H Voltage pulse <3 >10V
CoiL Magnetic pick-off
Pr .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 .5Speed 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
15

16

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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 2210k
VoLt5L Voltage pulse low 113V
VoLt5H Voltage pulse high1310V
CoiL Magnetic pick-off 0 40mV
Pr .dEt Proximity detector 21.2 2.1mA
ContACt Switch contact 2100 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 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 250Hz 12kHz
Heavy 120Hz 2kHz
Light 1000Hz 100kHz
The minimum operating input frequency is 0.01Hz.
Below this frequency the speed display will be forced
to zero.
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 .5from 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 .5prompt 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 &and *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 to 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 3.6; 4.1.8 and 4.2.7 of this manual.
20