Logitech Electronics 200 MKII Series User manual

200 MKII SERIES™
Tachometers
Model 200T
User Guide!

Contents
Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety information for E.U. users . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Transformer connections (230V/115V a.c. selection) . . . . . . . . . . . . 5
Switches and connections
Switch A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Switch B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mains Earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
D.C. power supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rear panel terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Programming the instrument
Choice of Mode setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Calculating a scaling factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Setting a scaling factor
— On an instrument that has not been previously scaled . . . . . . . .8
— On an instrument that has been previously scaled . . . . . . . . . . .9
Increasing the discrimination of the display . . . . . . . . . . . . . . . . . . 9
Adjustment of Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Diagrams
Front & rear panel layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Connection diagrams - typical applications . . . . . . . . . . . . . . . . . . .12
Additional information
Electro-Magnetic Precautions & Low Voltage Directive . . . . . . . . . 14
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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Specification
Display 4 decade 7-segment high brightness red LED, 14mm high
Decimal point Programmable via display board
Scaling Programmable via display board, retained in non-volatile memory.
Signal inputs (A and B)
Standard
Standard sensitivity 180mV to 10V- protected to 100V
Frequency Mode 30kHz maximum with single input,!
Ratio Mode 15kHz maximum with dual inputs
Impedance 15kΩminimum
Accuracy 0.05% with square wave at 1V peak
Optional
High sensitivity version 12mV to 1V — protected to 100V
Analogue input module (specified as 0-1V, 0-5V, 0-10V, 0-20mA, 4-20mA)
Control inputs M1 & M2 (Opto-isolated - require sink to 0V of 220W max)
Outputs
Standard Transducer supply 10V DC nominal unregulated @ 80mA max
Optional Higher transducer supply voltage 24V DC @ 50mA max
Connections Screw terminals on rear panel.
Power requirement
AC Factory set to 115V or 230V a.c. 50/60 Hz, loading 3VA.
DC Mains Tachometers can also be powered by providing 10V to 15V DC @
250mA max via the 10V terminal. Alternatively, if specified at time of
order, they can be configured to operate from 24V DC only (refer to DC
Supplies on page 6).
Temperature range
Operating 0°C to +50°C
Storage -20°C to +80°C
Dimensions 96 x 48 x 107mm (panel cut-out 92 x 43mm).
Weight 400g (standard mains supply version)
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General description
The 200T MKII SERIES™Tachometers are 4-decade seven segment high brightness red 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 4 and DC Supplies on page 6).
Two signal inputs are available, Input A and Input B. The two inputs share a common sensitivity
control (see page 5). If using only a single input signal then this should be connected to Input A.
200T MKII SERIES™ Tachometers are available with factory fitted options which must be specified
when ordering. See Specification section for details. Additionally, Logitech will customise the
programmed operating modes of these Tachometers to suit specialised applications. Many variations
on the standard software have been developed – please contact the Sales Office if this service is
required.
Note
200T MKII SERIES™instruments are available only with hidden function switches, mounted on the
display board, which are accessible if the bezel and front panel are temporarily removed. The
programming instructions in this user guide assume that the front panel has been removed to gain
access to these switches.
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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 6). 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
200 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 four screws in the rear of the case, then gently pull the instrument out
from the rear. The display board will be pulled away from the main board and fall
forwards.
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 re-assembled (one link is used for 230V
AC, two links are needed for 115V AC).

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Switches and connections
Switch A
This switch is located on the left hand side of the display. When the instrument is in RUN mode and
this switch is held down in conjunction with Switch B the instrument is put into set mode (see
Setting a Scaling Factor on page 7). Whilst in SET mode this switch is then used to step to each
decade in turn so that the value programmed can be altered by using Switch B.
In SET mode this switch steps through the parameters in the following sequence:
1. Scaling Factor
2. Decimal point (for Scaling Factor)
3. Decimal point (for final display)
Switch B
This switch is located on the right hand side of the display. When the instrument is in RUN mode and
this switch is held down in conjunction with Switch A the instrument is put into SET mode (see
Setting a Scaling Factor on page 7). Whilst in SET mode this switch is used to increment the value of
each decade, as selected by Switch A, or to step the position of the decimal point from right to left.
MODE selection (M2, M1)
To connect a MODE selection input to GROUND the user must connect a wire link between the
appropriate MODE input(s) (terminal 8, terminal 9) and 0V (terminal 7). This will select the function as
shown in the table below:
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M1
M2
FUNCTION
OPEN
OPEN
Frequency A x Scaling Factor
OPEN
GROUND
Ratio A/Bx Scaling Factor
GROUND
OPEN
Frequency A / Scaling Factor
GROUND
GROUND
Ratio A/B/ Scaling Factor

Mains Earth
200 MKII SERIES™Tachometers supplied to operate on mains power (115V or 230V AC) are fitted with
a three core mains cable. The Earth is normally connected by an internal link to 0V. For applications
where it is found that the mains earth is of poor quality, or when it is essential that the signal input is
floating, it may be necessary to remove this link. In these cases, the user must determine the most
appropriate method of earthing the instrument and may need to remove the internal connection — if
this is found to be necessary please refer to our Sales Office for advice.
(See also Safety Information for EU Users on page 4 and Electro-Magnetic Precautions on page 13).
DC Power Supplies
Mains powered Tachometers can be powered instead by feeding 10V to 15V DC into the 10V
terminal on the rear panel as long as there is no power on the 3-core mains cable. If you wish to use
this facility you must ensure that the supply is free from transient interference.
Alternatively, if specified at time of order, Tachometers can be configured to operate straight from a
nominal 24V DC supply (16V to 30V DC) via a 2-core cable (leaving the 10V terminal free for
operator use). 24V Tachometers should be connected to a supply protected with a 500mA fuse.
Rear panel terminals
1. 10V +10V DC (unregulated) @ 80mA
2. A2 No connection
3. A1 No connection
4. 0V Common
5. B Signal input B
6. A Signal input A
7. 0V Common
8. M2 Mode input (measure - frequency or ratio)
9. M1 Mode input (scaling factor - multiply or divide)
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Programming the instrument
Choice of MODE setting
For applications where a low number of pulses per second will be displayed as a speed (RPM etc)
leave M1 disconnected and use D = R x S
For applications where there are a large number of pulses per displayed unit, such as flow metering
applications, connect a link between M1 and ground and use D = R / S . Then, for flow metering
applications, S is simply programmed as the K-FACTOR of the flowmeter.
If the RATIO function is needed, then a link must be fitted between M2 and GROUND - see MODE
Selection on page 5.
Calculating a scaling factor
The displayed value is calculated as D = R x S or D = R / S where Sis the scaling factor and Ris the
measured rate of input signal in pulses per second (pps) or Hertz (Hz). The scaling factor is most
easily calculated by considering the maximum input frequency expected and by deciding what the
display should read at this frequency.
If a decimal point is required in the final display it should be ignored at this stage - see Increasing the
discrimination of the display on page 8. The scaling factor is then calculated as:
Displayed value divided by input frequency – if M1 is OPEN
Input frequency divided by displayed value – if M1 is GROUNDED
The scaling factor range is 0.001 to 9999 and it may be necessary to round off the calculated value to
fit within this range.
Setting a scaling factor
On an instrument that has not been previously programmed
Unless requested otherwise, Tachometers are normally supplied from the factory with all settings
programmed to zero.
On power up for the first time the display will show SET.....0000 (..... signifies a one second delay
before the display changes) with the least significant decade blinking and the instrument will be in the
SET mode awaiting programming.
To enter the scaling factor, simply press Switch B to alter the value for the decade that is blinking until
the correct figure is displayed. To move to the next highest decade in turn just press Switch A to move
from right to left.
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If it is necessary to enter a decimal point in the scaling factor you must use Switch A to step to the
most significant decade (even if the value for the higher decades is to remain at zero) and then press
Switch A once again to move on to the decimal point setting function.
At this point the decimal point will start to blink to show that you have reached this stage of the
scaling procedure. The decimal point should then be positioned as required by use of Switch B. At
this stage, each press of Switch B will move the decimal point one decade to the left.
On an Instrument that has been previously scaled
If a Tachometer has been supplied with factory programmed settings as requested, or once the user
has programmed the settings and returned the instrument to the RUN mode, on power up the display
will show run for one second followed by -sig (indicating NO SIGNAL) or another value if there is
already an input signal of sufficient amplitude.
If it is necessary to change the scaling factor, hold down Switch A and Switch B at the same time until
the display changes to show SET and then release the switches. The display should now show the
values previously programmed and the least significant (right hand) decade should be blinking.
To alter the scaling factor, simply press Switch B to alter the value for the decade that is blinking until
the correct figure is displayed. To move to the next highest decade in turn just press Switch A to
move from right to left.
If it is necessary to enter a decimal point in the scaling factor you must use Switch A to step to the
most significant decade (even if the value for the higher decades is to remain at zero) and then press
Switch A once again to move on to the decimal point setting function.
At this point the decimal point will start to blink to show that you have reached this stage of the
scaling procedure. The decimal point should then be positioned as required by use of Switch B. At
this stage, each press of Switch B will move the decimal point one decade to the left.
Increasing the discrimination of the display
In some applications it may be an advantage to increase the discrimination of the displayed value D.
This can be achieved by moving the decimal point when setting the scaling factor S.
If M1 is OPEN then moving the decimal point to the right will increase discrimination. If M1 is
GROUNDED then moving the decimal point to the left will increase discrimination.
See the following example:
Assume an input frequency of 50 Hz and a calculated scaling factor of
1.00, then with M1 OPEN D = S x R = 50
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By moving the decimal point in the scaling factor by one place to the right an extra decade of
discrimination can be achieved:
Thus if we make S= 10 then Dwill read 500
It is now necessary to position the decimal point in the final display. You progress to this stage of the
scaling procedure by pressing Switch A once again.
At this stage the display will show ----. with the decimal point blinking. Press Switch B to position the
decimal point where required — in this case the decimal point is moved one place to the left. The
display will now show 50.0 giving an extra decade of discrimination.
If two decades of discrimination are required, simply move the decimal point two places to the right in
the calculated scaling factor, and then position the decimal point accordingly in the final display.
The only limit to the amount of discrimination available is if the display goes beyond 9999 in which
case it will read high and it is then necessary to reduce the input frequency or to reduce the
discrimination of the display.
When all parameters have been programmed to the required values return to the RUN mode by first
holding down Switch A and then pressing and releasing Switch B twice, and then you can release
Switch A. The display will show run for one second followed by -sig (indicating NO SIGNAL) or
another value if there is already an input signal of sufficient amplitude.
Adjustment of Sensitivity
With the scaling factor set and the instrument in the RUN mode, connect the signal(s) to INPUT A
(and INPUT B for RATIO measurement).
The sensitivity control is located to the right of the terminal block on the rear panel and is accessible
through a 4mm hole in the rear panel.
Start with the control set fully anti-clockwise (minimum sensitivity). If no value is shown on the
display, turn the control slowly clockwise until the signal is detected.
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.
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Diagrams
Front Panel Layout
To access Switch A and Switch B remove the bezel and front panel
Rear panel layout
Sensitivity Control
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Connection diagrams – typical applications
Variable reluctance Magnetic Pick-ups
Single-input operation
Dual-input operation
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10V A2 A1 0V 0V
BAM2 M1
Sens
A
Magnetic Pick-up
Gear wheel
or
flowmeter
screen Black
Red
10V A2 A1 0V 0V
BAM2 M1
Sens
A
B
Gear wheels or flowmeters
Magnetic Pick-ups
screens
Red
Black

Electronic Sensors and Rotary Encoders
Photo-electric sensor or Proximity probe
Digitising encoder (shown with optional Measuring Wheel)
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10V A2 A1 0V 0V
BAM2 M1
Sens
A
screen -ve +ve
signal
10V A2 A1 0V 0V
BAM2 M1
Sens
A
screen -ve +ve
signal

Additional Information
Electro-Magnetic 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 (Electro-Magnetic 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 and therefore
instruments are normally shipped with this connection in place.
The exceptions to this are if it is found that the mains earth is of poor quality or when it is essential
that the signal input is floating.
In these cases, the user must determine the most appropriate method of earthing the instrument and
may need to remove the internal connection — if this is found to be necessary please refer to our
Sales Office for advice.
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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.
Warranty
200T 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: 200T-MKII_hb v1.6 July 2017
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Design and Manufacture of Electronic Systems and Instrumentation. Supply of Sensors and Transducers
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