Logitech Electronics 2000 MKII Series User manual

2000 MKII SERIES™
Counter/
Tachometer
Model 2000CT
User Guide!

Contents
Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Information for EU users . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Transformer Connections (230V/115V AC selection) . . . . . . . . . . . . . . . . . . . . . . 5
Switches and Connections
Run/Set Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.
Function (FUNC) Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
DP Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
0-9, +/- Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Rear Panel Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Sensitivity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Alarm Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Mains Earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Programming the Instrument
Calculating a RATE and a TOTAL Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Programmable Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
—— FACTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
—— TOTAL Scaling Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
—— TOTAL Decimal Point Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.
—— RATE Scaling Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
—— RATE Decimal Point Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
—— LOW Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
—— HIGH Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Analogue Output Settings (if O/P module ordered) . . . . . . . . . . . . . . . . . . . . . 10.
—— Reference (REF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
—— Full Scale (FS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Operating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Reset of Total Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Alteration of Programmable Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Protection of Factor Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.
Diagrams
Front & Rear Panel Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Connection Diagrams - Typical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Alarm Output Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Additional information
Electro-Magnetic Precautions & Low Voltage Directive . . . . . . . . . . . . . . . . . . 16
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
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Specification
Display 7-segment red LED, 10mm high
RATE — 6 Decade
TOTAL — 7 Decade
Decimal point Programmable from front panel
Rate
Accuracy 0.05% with a square wave at 1V peak
Signal Inputs Signal A
Normal Sensitivity 180mV—10V (protected to 100V)
High Sensitivity Option 12mV—1V (protected to 100V)
Frequency 30 kHz max
Impedence 15kΩmin
Control Inputs Factor protection
Outputs High Alarm, Low Alarm (Open Collector 200mA @ 60V max)
Total
Signal Inputs Signal B — count up
Control Inputs Factor protection, external Reset
Control inputs Opto-isolated - requires sink to 0V of 220W maximum.
Outputs DC Voltage (10V nominal unregulated @ 80mA max)
Scaling Programmable via front panel (non-volatile memory)
Connections Screw terminals on rear panel.
Power requirement
AC Factory set to 115V or 230V AC 50/60 Hz, loading 3VA.
DC Mains Tachometers can also be powered by providing 10V to 15V DC @
300mA max via the 10V terminal.
Temperature range
Operating 0°C to +50°C
Storage -20°C to +80°C
Dimensions 96 x 48 x 113mm (panel cut-out 92 x 43mm).
Weight 500g
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General Description
The 2000CT Combined Counter/Tachometers*are 6-decade seven segment LED display
instruments based on the industry standard Intel 80C51 series microprocessor. They are built into
half DIN (96 mm x 48 mm) panel mounting housings and can be supplied to operate on 115V or 230V
AC or 24V DC power supplies (see Transformer Connections on page 5).
The 2000CT is designed to accept a pulsed signal from either one or two sources and the display can
be switched to show the rate of the input signal or the total count as and when required. Both options
are continuously monitored and either may be instantaneously selected by pressing a button on the
front panel. A high and low alarm can be set for the rate value and the appropriate output will be
activated when the value falls outside either limit.
The displayed values are scaled so that one unit on the display can represent a pre-set number of
input pulses. In addition to this scaling there is the facility for individual scaling of the total display
and the rate display so that rate may be displayed as units per second, units per minute, units per
hour, milli-units per second etc., and total can be displayed as units, milli-units, kilo-units etc. An
option is available for output of the rate value in a fully scalable analogue form, either current or
voltage.
2000 Series instruments are available with several factory fitted options which must be specified
when ordering — see Specification on page 3 for details. Additionally, Logitech will customise the
programmed operating modes of these instruments to suit specialised applications. Many variations
on the standard software have been developed — please contact our Sales Office if this service is
required.
Note: Two versions of 2000 Series instruments are available - either with a full switch set accessible
externally on the front panel, or with only a single function switch (FUNC) accessible unless the
bezel and front panel are temporarily removed. The following setting up instructions assume the front
panel has been removed if using a single switch version.
*In some industries these type of instruments may be described as “Totaliser/Ratemeters”!
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Safety Information for EU Users
WARNING This instrument must be earthed when powered from a mains supply (see also Mains
Earth on page 7 and Electromagnetic Precautions on page 16). Refer to the rating label for the pre-
set voltage and ensure that the instrument voltage corresponds to the intended supply voltage.
Important: The wires in the power lead fitted to mains instruments are coloured in accordance with
the following code:
Green and Yellow . . . . . . . . . . . . . Earth
Blue . . . . . . . . . . . . . . . . . . . . . . . Neutral
Brown . . . . . . . . . . . . . . . . . . . . . . Live
As the colours of the supply lead fitted to mains supply instruments may not correspond with the
coloured markings identifying the terminals in your plug, connections should be made as follows:
• Connect the green and yellow wire to the terminal marked with the letter E or identified with the "(earth) symbol.
• Connect the blue wire to the terminal marked with the letter N or coloured black.
• Connect the brown wire to the terminal marked with the letter L or coloured red.
The mains supply to this instrument must be protected with a 1 Amp fuse.
Transformer Connections
2000 MKII SERIES™instruments for use on mains power can operate on either a 230V or 115V
50/60Hz AC supply.
Instruments are factory pre-set to operate from the mains voltage specified at time of ordering.
If, for any reason, the user needs to change the mains operating voltage the following procedure
must be adhered to:
1. Disconnect the Mains Supply.
2. Gently prise off the front panel bezel surround and allow the front panel to fall forward
and out.
3. Remove the two nuts at the rear of the case, then push the instrument out through the
case front.
4. Pads which select the operating voltage are located on the under side of the printed
circuit board. The existing link(s) should be removed and new link(s) should be soldered
across the appropriate pads, and the instrument reassembled (one link is used for 230V
AC, two links are needed for 115V AC).

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Switches and Connections
RUN/SET Switch
This switch is located in the top right hand corner of the front panel.
When the instrument is in the RUN mode, it will display the measured signal, the value of which will
depend whether the instrument is set to display RATE or COUNT. Momentarily pressing this switch
once puts the instrument into the SET mode and activates the DP, 0–9 ; and the +(polarity) switches.
To return to the RUN mode, simply momentarily press this switch once again.
FUNCTION (FUNC) Switch
This is located directly below the RUN/SET switch and is used when it is required to observe or set
the programmable parameters. When in the SET mode, momentarily pressing the FUNC switch
steps through the parameters in the following sequence see Programming the Instrument on page 8:
If the instrument is in the RUN mode, a single depression of the FUNC switch will toggle the display
between showing the accumulated TOTAL value, or the current RATE value (unless there is no input
signal when displaying RATE, in which case the display will show NO SIG ).
DP (Decimal Point) Switch
This is located under the FUNC switch and is used to set the position of the decimal point as
required. A single depression of the switch will move the decimal point one decade. Holding the
switch depressed will cause the point to move in decade steps from right to left at a pre-determined
rate. This switch is only active when setting either the Factor, the Total: Scaling Value or the Rate:
Scaling Value parameters.
0-9 Switch
Located under each decade, these switches are used to set the value of all programmable
parameters. Each depression increments the display one digit. Holding the switch depressed steps
the display through 0to 9 at a pre-determined rate.
+/- Switch
Located at the lower left hand corner of the front panel, this switch has no function on 2000CT
models.
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Factor
Universal Scaling Factor
Total....Scale
Multiplying factor for displayed value for TOTAL
Disp. DP
Decimal point position in displayed value for TOTAL
Rate....Scale
Multiplying factor for displayed value for RATE
Disp. DP
Decimal point position in displayed value for RATE
ALA L
“Low Alarm” set point
ALA H
“High Alarm” set point

Rear Panel Terminals
*Note regarding Rate signal input and Count signal input:
The 2000CT is designed to accept a rate signal input and/or a count signal input and these can be supplied by two
different sensors or pulse sources. If only one signal source is to be used for both Rate and Count monitoring, then
simply connect the signal source to IPa (terminal 10) and fit a link from IPa to IPb (terminal 12).
Sensitivity Control
This is located to the right of the terminal block on the rear panel and is factory pre-set. However,
should it be necessary during on-site installation, adjustment is accessible through a hole in the rear
panel itself.
Maximum sensitivity is obtained when the Control is turned fully clockwise. It is recommended that
the sensitivity level is increased only as far as necessary to obtain a steady signal. This minimises
the risk of detecting spurious signals.
Alarm Outputs
The Alarm Output facility is available in the RATE mode only. The HIGH alarm will be activated when
the value shown on the display is equal to, or greater than, the value programmed into memory. The
LOW alarm operates on a value equal to, or below, the programmed value.
The alarm outputs automatically reset when the value shown on the display returns to a “no alarm”
value.
Mains Earth
2000CT Counter/Tachometers are supplied with a three core mains cable. The earth lead from this
cable is connected to terminal 4 ( ) on the Rear Panel terminal block. For most applications this
Earth terminal should be linked to 0V terminal 3 (COMMON) - see also Safety Information for EU
Users on page 5 and Electromagnetic Precautions on page 16.
Exceptions to this are if the COMMON is connected to Earth elsewhere in the system (care must be
taken to avoid Earth loops); or it is found that the mains earth is of poor quality; or when it is essential
that the signal input or the analogue output of the instrument is floating.
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AL
Low Alarm
AH
High Alarm
0V
Signal Common
Connected directly to earth wire in mains cable
10V
10 to 13v @ 80mA (unregulated D.C. output for sensors)
Rst
Reset Input for TOTAL
M0
Protection input for Meter Factor
M1
Not used
0V
Common
IPa
Rate Signal input*
0V
Common
IPb
Count Signal input*
"

Programming the Instrument
Calculating a RATE and a TOTAL Factor
The value displayed for RATE is calculated as :
RATE = N x Scaling Value N = number of pulses counted in time T
T x FACTOR T = measurement time (usually 1 sec)
The value displayed for TOTAL is calculated as :
TOTAL = C x Scaling Value C = total count.
FACTOR
Programmable Parameters
The following values must be programmed into the unit in order to display the desired values:
i Factor
ii Total - scaling value
iii Total - decimal point position
iv Rate - scaling value
v Rate - decimal point position
Other parameters that may need to be programmed are:
vi Low Alarm limit
vii High alarm limit
And if the analogue output option has been specified:
viii Reference
ix Full Scale
In order to program the parameters the instrument must be operating in the SET mode. Unless the
appropriate parameters have been specified at the time of ordering, all values will be factory set to
zero when the instrument is first powered up.
Since zero is an invalid number for Factor or Scaling values, the instrument must have a link
connected between M0 (terminal 7) and 0V (terminal 9 Common), and will initially be forced into the
setup routine and will display SET …. FACTOR …. 0 (.... signifies a one second delay before the
display changes).
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If the display shows RATE or TOTAL when power is first applied to a not-yet-programmed
instrument, it is because the link is missing (see also the section entitled Alteration of Programmable
Parameters on page 12).
To change a decade value press the button located immediately below the digit. The value will
increment from 0to 9and then return to 0. If the button is held down the value will increment
automatically every second. The button can be released when the required value shows.
To change the decimal point position press the button at the lower right hand side of the panel. The
decimal point will step from the right to the left and return to the right. It is not possible to adjust the
position of the decimal point when parameters vi to ix are accessed.
After the required value has been entered for the first parameter, press the FUNC button once to step
to the next parameter to be entered (information about each parameter follows below) and repeat for
each parameter in turn.
Once all the parameters have been stepped through in turn, one more press of the FUNC button will
return the display to the first parameter again if you want to amend or check the values that have
been programmed prior to returning the instrument to the RUN mode.
Otherwise, when the required values have been programmed, press the RUN/SET button once to
switch the instrument to the RUN mode ready for use.
The values programmed into the instrument are stored in non-volatile memory and need setting only
once for a particular application and will be retained in the event of a power loss.
i — FACTOR
The FACTOR parameter is protected and cannot be set unless a link is connected between M0 and
0V (on the rear terminal block).
The value entered as FACTOR is applied to both the RATE and TOTAL displayed values. The value
entered should be the number of input pulses which correspond to one measurement unit, e.g. if the
measurement device is a Flowmeter with 3500 pulses per litre then the value entered should be
3500.
Note: It is possible to enter a value other than an integer by pressing the bottom right hand button
which moves the decimal point.
ii — TOTAL: Scaling Value (TOTAL …. SCALE …. )
After the total count has been divided by the FACTOR, the result is multiplied by the scaling value
before being displayed. If a small value is expected then it may be appropriate to set the scaling
factor to 100, 1000 or even more so that the full capabilities of the instrument may be utilised by
displaying the total to several decimal places.
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Alternatively, if a very large value is anticipated, it may be appropriate to set the scaling factor to 0.1,
0.01, etc. to ensure that the displayed value will not overflow the display.
iii — TOTAL: Decimal Point Position (DISP. DP)
When this parameter is first displayed, the display will show ------ with no decimal point showing.
The decimal point will move one place to the left on each depression of the lower right hand button.
The value appearing in the display for TOTAL will have a decimal point displayed in the chosen
position.
iv — RATE: Scaling Value (RATE .... SCALE)
The measured number of pulses per second is divided by the FACTOR and then multiplied by this
scaling value before being displayed (see ii above).
v — RATE: Decimal Point Position (DISP. DP)
When this parameter is first displayed, the display will show ------ with no decimal point showing.
The decimal point will move one place to the left on each depression of the lower right hand button.
This sets the position of the decimal point in the display when RATE is being displayed (see iii
above).
vi — Low Alarm (ALA L)
When the calculated rate is equal to or is less than the value entered for Low Alarm the associated
output will be activated. It is not possible to adjust the position of decimal point when programming
the value. The decimal point position will be taken from that set in step vabove.
vii — High Alarm (ALA H)
This is identical in operation to the Low Alarm feature described above but operates when the rate
equals or is greater than the programmed value.
Analogue Output Settings
(optional extra, available only if specified at time of ordering)
viii — Reference (REF)
The setting for reference defines the rate value for which the analogue output is at zero. This “zero”
will be 0V for 0–5V output, 0mA for 0–20mA output or 4mA for 4–20mA output. A calculated rate
value between the reference value and the full scale value causes an output to be produced.
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ix — Full Scale (FS)
The setting for Full Scale defines the rate value for which the analogue output will be at maximum
(5V or 20mA depending on option originally ordered).
When all parameters have been programmed it is possible to step through all settings by repeatedly
pressing the centre right hand button (FUNC). When all parameters are set to their required values
then the unit can be switched to normal operating mode by pressing the top right hand button (RUN/
SET).
Operating Mode
When the instrument is switched from SET mode to RUN mode or when power is applied after the
programmable parameters have been previously set, the display will show RATE for a period of one
second followed by the calculated value or NO SIG if the input signal does not change state during
the one second gating period. If the calculated value is too large to be displayed then the display will
read HIGH.
If the FUNC button is pressed the mode will change from rate display to total display. The unit will
display TOTAL for one second followed by the current total count.
Note: RATE is displayed using a maximum of six digits.
TOTAL is displayed using up to the full seven digits.
The rate is continuously monitored and alarms will be set if appropriate. If the analogue output option
has been specified then it will be updated in response to changing rates, irrespective of whether
RATE or TOTAL is shown on the display.
Reset of Total Count
It is possible to reset the TOTAL count by either one of two methods.
1. By momentarily connecting RESET (terminal 6 on the Rear Panel) to 0V. This can be
accomplished by a push button switch or by using a key switch which would provide security
and avoid inadvertent or unauthorised operation.
2. Alternatively, the FUNC switch can be used to reset the count. To zero the TOTAL
display using the FUNC switch, the button must be held down for approximately six seconds
while the display shows TOTAL …. RESET …. 3 .… 2 ….1 …. 0!
When the display shows RESET 0 the switch button can be released and the TOTAL count
value will now be displayed as 0.
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Alteration of Programmable Parameters
The programmable parameters can be accessed at any time by momentarily pressing the RUN/SET
button once. This will cause the mode to change from the normal RUN mode to the SET mode. The
unit will normally display SET …. TOTAL …. SCALE .... followed by the current value
programmed for the total scaling value. The value set for FACTOR may be protected (see below).
If the Factor or Scaling Value is changed after the instrument has been in use operationally, then
TOTAL should be reset prior to using the instrument with the revised programming to avoid the
possibility of an incorrectly displayed value which has been held in memory from use with the
previous settings.
Protection of Factor Value
Remember that the value entered for FACTOR can only be accessed by connecting a link on the rear
terminal block between M0 (terminal 7) and 0V. When the RUN/SET button is pressed while this link
is in place the unit will display SET …. FACTOR .... followed by the current value programmed
for FACTOR. This value can then be changed and all other programmable parameters are
accessible, as before (see Programming the Instrument on page 8), by pressing the FUNC button.
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Diagrams
Front Panel Layout
Note: On instruments with the SINGLE switch set option
only the FUNC switch is accessible unless the bezel and front panel are removed
Rear panel layout
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Connection Diagrams – Typical Applications
Variable reluctance Magnetic Pickups
Single-input operation
Dual-input operation
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Alarm Output Connections
Alarm connections with external power supply
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Additional Information
Electromagnetic Precautions
Logitech have designed in a great deal of noise immunity into the product in accordance with
EN5001-2 and EN5002-2 (radiated emissions, conducted emissions, ESD, radiated susceptibility and
fast burst transient testing)
However it is still vital to use good EMC (Electromagnetic Compatibility) techniques on installation of
both this and other associated electronic equipment and sensors in order to ensure reliable
operation.
It is important to note that if used with systems that radiate high levels of harmonic noise such as DC
Drives, AC Inverters and Servo Drives then the levels of imposed interference can greatly exceed
that of the European Standards.
In such cases it is important to ensure that mains leads are routed as far as possible from all cables
carrying power to such equipment and that the supply should, if viable, be taken from a clean source.
Where this is not possible, it is advisable to use a good quality mains filter mounted as close to the
instrument as possible, ensuring that the cable between the filter and the instrument is kept separate
from any cables carrying high levels of current or any fast switching transients.
All signal connections to the instrument should be made using screened lead with the screen
connected to mains earth at one end only.
Wherever possible, it is advisable to connect the 0V terminal to mains earth, unless it is found that
the mains earth is of poor quality or when it is essential that the signal input is floating — see Mains
Earth on page 7.
Low Voltage Directive
It is essential that the mains supply to the instrument is fused externally to no more than 1A and that
the cabling supplying power to the instrument is rated for at least 3A.
Low voltage signal cables should not be run in the same conduit or twisted or tied to cables carrying
voltages in excess of 50V (AC or DC).
If the instrument is not installed fully in accordance with the instructions in this User Guide it may not
comply with the requirements of the Low Voltage Directive.
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Warranty
2000T MKII SERIES™Tachometers carry a two year warranty that is only valid where there is no
damage caused by accident, negligence, misapplication, or repairs/modifications attempted by
unauthorised personnel. The warranty only extends to the original user.
Copyright © Logitech Electronics Limited
1994 to 2017
Document No: 2000CT-MKII_hb v3.0 July 2017
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Design and Manufacture of Electronic Systems and Instrumentation. Supply of Sensors and Transducers
Lane End | Church Aston | Newport | Shropshire | TF10 9JJ | UK
www.logitechelectronics.com
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