BEKA BA314NG User manual

Issue: 5
9th July 2019
BA314NG
Ex nA and Ex tc
Tachometer
Issue 5

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 Safety parameters
3.4 Special conditions for safe use
3.5 Power supply
3.6 Pulse input
3.7 Remote reset terminals
3.8 Certification label information
4. System Design for Gas 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 EMC
5.4 Units of measurement and tag marking on
scale card.
6. Configuration and Calibration
6.1 Configuration 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 Ex nA certification
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 BA314NG are 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 Units of measurement and instrument
identification.
9.2 Display backlight
9.3 Alarms
9.3.1 Solid state output
9.3.2 Ex nA certification
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 Ex nA certification
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 ATEX dust certification
Appendix 2 IECEx certification
Appendix 3 ETL & cETL certification for
installation in USA and Canada.
3
CONTENTS CONTINUED

1. DESCRIPTION
The BA314NG is an Ex nA and Ex tc certified, field
mounting Tachometer primarily intended for
measuring rotational speed within a Zone 2 or 22
hazardous area. To assist with routine maintenance,
the Tachometer includes a run-time clock that records
the number of hours that the monitored machinery has
been operating. The BA314NG is controlled and
configured via the four front panel push buttons, a
user defined four digit code may be entered to prevent
accidental access to the instrument's configuration
menu.
This instruction manual supplements the abbreviated
instruction sheet supplied with each instrument.
The BA314NG has been issued with a Type
Examination Certificate ITS16ATEX48409X by
Notified Body Intertek Testing and Certification Ltd.
This confirms compliance with the type of protection
requirements for non-sparking Ex nA apparatus, and
for dust ignition protection by enclosure Ex tc. This
certificate has been used to confirm compliance with
the European ATEX Directive 2014/34/EU.
For international applications the BA314NG also has
IECEx certification which is described in Appendix 2.
For applications in the USA and Canada the
BA314NG has ETL and cETL approval, see
Appendix 3.
2. OPERATION
Fig 1 shows a simplified block diagram of the
BA314NG 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 BA314NG 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 BA314NG block diagram
4

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.
2.2 Controls
The BA314NG 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 (Always fitted)
- 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 (and *buttons are operated
simultaneously.
See 9.3.13 and 9.3.14
2.3 Displays
The BA314NG 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.
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.
5

3. CERTIFICATION
The BA314NG 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. ETL
and cETL certification for installations in the USA and
Canada are described in Appendix 3.
3.1 ATEX Ex nA certification
Notified Body Intertek Testing and Certification Ltd
have issued the BA314NG 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 Zener barriers or
galvanic isolators as shown on the Type Examination
Certificate. This allows the Tachometer to be adjusted
and configured live when installed in Zones 2.
When connected to a suitable system the BA314NG
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 Safety parameters
The certificate specifies input safety parameters in
normal operation i.e. without faults for all the
instrument terminals. Where only a voltage or a
current is specified, the unspecified parameter will
be defined by components within the instrument.
3.4 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 BA314NG
Tachometer should be:
a. Supplied from a limited energy circuit with
output parameters in normal operation equal
to, or less than the instrument’s input
parameters. The certificate states that It is
not necessary to power the instrument from
an intrinsically safe interface, such as a
certified shunt diode safety barrier or a
galvanic isolator to comply with this
requirement.
b. Fitted with cable entry glands or conduit
fittings which maintain the impact and ingress
protection of the enclosure. Certified Ex e or
Ex n components satisfy these requirements.
The BA334E is supplied fitted with one
certified M20 stopping plug and one
temporary hole plug which should be replaced
with the required gland or conduit fitting.
3.5 Power supply
The input safety parameters for the power supply
terminals 1 and 2 are:
Ui = 30V dc
Ii = 100mA
This allows the BA314NG to be powered from any
dc supply which in normal operation has an output
of less 30V and 100mA. See section 4.1 for power
supply recommendations.
6

3.6 Pulse input
The BA314NG 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 BA314NG 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
3.7 Remote reset terminals
The BA314NG 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 safety parameters
in normal operation:
Ui = 30V
Uo = 3.8V
Io = 1mA
3.8 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 and IECEx certification
information plus BEKA associates name, location,
year of manufacture and the instrument serial number.
BA314NG Certification information label
7

4. SYSTEM DESIGN FOR GAS HAZARDOUS
AREAS.
When correctly installed in Zone 2 the BA314NG
Tachometer 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 BA314NG 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
BA314NG 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 BA314NG 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 BA314NG ATEX Type Examination
Certificate.
2. BA314NG terminals should only be connected
to circuits having safety parameters in normal
operation compliant with the BA314NG safety
parameters which are specified by the ATEX
Type Examination Certificate.
3. Hazardous area apparatus to which the
BA314NG 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 BA314NG.
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 BA314NG. See Fig 1.
4.1 Power supply
The BA314NG Tachometer requires a minimum of
10V between terminal 1 & 2 and consumes:
10mA without optional backlight
plus 6mA when terminals 3 & 4 are linked
plus 16mA with optional backlight
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 a
fuse with easily removable fuses which can be
extracted to achieve isolation as shown in Fig 2. If
an input current safety parameter Ii is specified, a
suitably rated fuse will ensure that it is not
continuously exceeded in normal operation.
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.
8

4.2 Pulse input
The BA314NG can display speed and run-time from
sensors with a wide variety of pulse outputs 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 BA314NG Tachometer is correctly
installed in Zone 2, the input terminals may be
connected to a certified sensor located in Zone 1 as
shown in Fig 5. The sensor should have Ex e or
Ex d certification permitting installation in Zone 1.
Intrinsically safe Ex i certified sensors should not be
used.
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
Sensors with a switch contact, proximity detector or
an open collector output require energising which is
achieved by linking Tachometer terminals 3 and 4.
4.2.2 Switch contact input
Any sensor with a mechanically or magnetically
activated switch contact located in Zone 2 or in the
safe area may be directly connected to the pulse
input terminals 5 and 6. The Tachometer input is
non incendive therefore the switch contacts do not
need additional protection in Zone 2. The switch
sensor and associated wiring should be able to
withstand a 500V rms insulation test to earth. Most
magnetically activated reed relays used in sensors
comply with these requirements. The BA314NG
contains a configurable debounce circuit to prevent
contact bounce being counted. See section 6.6.
9

4.2.3 Open collector input
Sensors with an open collector output 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 BA314NG contains a configurable debounce
circuit to prevent false triggering. See section 6.6.
4.2.4 2-wire proximity detector input
Most Zone 2 certified NAMUR 2-wire proximity
detectors, except intrinsically saf devices, may be
directly connected to a BA314NG input terminals 5 &
6 providing minimum operating voltage is greater than
7.5V. The proximitor and the associated wiring should
be able to withstand a 500V rms insulation test to
earth.
The BA314NG contains a configurable debounce
circuit to prevent false triggering. See section 6.6.
4.2.5 Magnetic pick-off input
Sensors incorporating a magnetic pick-off will usually
have a low level ac voltage output which a BA314NG
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 sensors, except intrinsically safe devices,
providing the output in normal operation is equal to or
less than 30V the Tachometer's Ui. The sensor and
associated wiring should be able to withstand a 500V
rms insulation test to earth.
The BA314NG contains a configurable debounce
circuit to prevent false triggering. See section 6.6.
4.2.6 Voltage pulse input
Two voltage pulse input ranges are selectable in the
BA314NG 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, except intrinsically safe source,
providing the output in normal operation is equal to or
less than 30V, the Tachometer's Ui. The sensor and
associated wiring should be able to withstand a 500V
rms insulation test to earth.
The BA314NG contains a configurable debounce
circuit to prevent false triggering. See section 6.6.
4.3 Remote reset
The BA314NG 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. The Tachometer’s reset circuit is
non incendive, therefore the switch contacts do not
need additional protection in Zone 2, although the
switch and the associated wiring should be able to
withstand a 500V rms insulation test to earth.
The BA314NG run-time display may also be reset
when the &and *push buttons are operated
simultaneously in the totalising mode i.e. when the
instrument is displaying speed. See 6.15
10

5. INSTALLATION
5.1 Location
The BA314NG Tachometer is housed in a 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.
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. The bonding plate 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 BA314NG Tachometer may be pipe mounted
using a BA393G pipe 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
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. Feed the field wiring through a gland in the
back-box and tighten to maintain ingress
protection. 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 BA314NG installation procedure
Fig 7 Dimensions and terminal connections
11

5.3 EMC
The BA314NG 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.
12

6.0 CONFIGURATION & CALIBRATION
The BA314NG 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 factory 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 Configuration structure
Fig 9 shows the BA314NG 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 (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 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.
13

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:
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 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 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 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 3.7 and 4.3 of this manual.
20