Logitech Electronics 2000 MKII Series User manual

2000 MKII SERIES™
Counters
Model 2000C
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rear Panel Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Sensitivity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Control Inputs (RST, STP, GO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Mains Earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Programming the instrument
Setting a scaling factor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Calculating a scaling factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Increasing the discrimination of the display . . . . . . . . . . . . . . . . . . .9
Using the offset facility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Operating the instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Output options and use on external DC supplies . . . . . . . . . . . . . . 11
Diagrams
Front & rear panel layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Connection diagrams - typical applications . . . . . . . . . . . . . . . . . . .13
Additional information
Electromagnetic Precautions & Low Voltage Directive . . . . . . . . . 15
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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Specification
Display 6 decade and sign 7-segment red LED, 10mm high
Decimal point Programmable from front panel
Scaling Programmable via front panel, retained in non-volatile memory.
Signal inputs
Standard (Count Up and Count Down)
Standard sensitivity 180mV to 10V — protected to 100V
Frequency 0—100kHz
Impedance 15kΩminimum
Maximum Pulse Count 4,000,000,000
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 Opto-isolated — requires sink to 0V of 220Ωmaximum.
Start, Stop, Reset (0.3ms signal duration)
Outputs
Standard
Transducer supply 10—12V DC nominal unregulated @ 100mA max
Optional Analogue 0–1V, 0–5V, 0–10V, 0–20mA, 4–20mA
Dual Relay module — can switch 8A @ 240V AC
Serial Interface
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 Counters can also be powered by providing 10V to 15V DC @
300mA max via the 10V terminal (refer to WARNING on page 11)
Alternatively, if specified at time of order, they can be configured to
operate from 24V DC only.
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 (standard mains supply version)
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General Description
The 2000T MKII SERIES™ Counters are 6-decade seven segment high brightness red LED display
instruments based on the industry standard 8051 series architecture 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).
2000T MKII SERIES™ Counters 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 Tachometers to suit
specialised applications.
Many variations on the standard software have been developed — please contact the Sales Office if
this service is required for your installation.
Note:
Two versions of 2000T MKII 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.
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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 8). 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 underside 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 and is used to switch the
instrument between normal RUN mode to SET mode in order that the user programmable factors can
be entered.
RUN mode. While the unit is in RUN mode all switches except for the RUN/SET switch are disabled.
Pressing this switch changes the Counter to the SET mode and enables the DP, 0–9, and the ±
(polarity) switches (see Setting a scaling factor on page 9).
FUNCTION (FUNC) Switch
This is located directly below the RUN/SET switch and is used in SET mode when it is required to
check or set the programmable parameters. Pressing the FUNC switch toggles between the two
following parameters:
SCALE (Scaling Factor)
OFFSET
Each of the above function names is displayed for one second before the display automatically
changes to display the value that has been set for the parameter. At this stage it is necessary to
enter a value, if required, or step to the next parameter by a single depression of the FUNC switch.
When the Counter is being used and is operating in RUN mode, the FUNC switch can be used as a
RESET if a link is wired on the rear panel terminal block between RST (terminal 6) and 0V (terminal
3).
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 scaling factor or the offset (the DP position in the
normal display)
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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 9at a pre-determined rate.
+/- Switch
Located at the lower left hand corner of the front panel, this switch selects negative values when
required by displaying a negative sign. No sign is displayed for + (positive) values.
Rear Panel Terminals
Sensitivity Control
This is located to the right of the terminal block on the rear panel and is factory preset. 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.
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1
Not used
2
Not used
3
0V
Common
4
Mains earth
5
10V
+10V DC (unregulated) @ 80mA
6
RST
Reset
7
STP
Stop count
8
GO
Start count
9
0V
Common
10
CU
Count Up
11
0V
Common
12
CD
Count Down
#

Control inputs (RST, STP, GO)
Depending on the mode of operation requested at the time of ordering, a 2000C can be factory set to
enable operate of these functions in one of two ways:
Fully manually controlled
The control inputs are activated by momentarily connecting to 0V. After a reset signal (or
immediately after the instrument is turned on) a START signal must be applied before the
instrument will accept count signals.
If required, the count can be paused by using the STP input. After the count is stopped it may be
restarted with a signal on the GO input, and the accumulative count will continue from the paused
displayed value.
At any time, a reset signal will stop the count and reset the counter to zero.
Quick start
The control inputs are activated by momentarily connecting to 0V. After a reset signal (or
immediately after power is applied) the instrument is automatically ready to start counting as soon
as input signals are detected.
If required, the count can be gated by using the STP/GO inputs. After the count is stopped it may
be restarted with a signal on the GO input (to carry on with the count) or by applying a reset.
A reset signal will reset the counter to zero and then enable counting.
Mains Earth
2000 MKII SERIES™ Counters 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 common terminal 3 (0V) — see also
Safety information for EU users on page 5 and Electromagnetic Precautions on page 15.
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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Programming the Instrument
Setting a scaling factor
Once a scaling factor has been set it is retained in memory upon power down. When power is
reinstated the unit will immediately be ready for operation without need for a reset command. If no
scaling factor has been set, when power is applied the unit will enter the SET mode (operation of the
unit without a pre-set scaling factor is not possible).
To access the SET mode when a scaling factor has already been set press the RUN/SET button.
The display will show SET …. SCALE (.... signifies a one second delay before the display
changes) and then show the scaling factor that is currently contained in memory. The digits can be
changed by pressing the buttons beneath each decade. The position of the decimal point is changed
by pressing the bottom right hand button to step to the position required.
Calculating the scaling factor
The displayed count in the 2000C is calculated D = Sc where Sis the Scaling Factor and cis the
number of input pulses counted — ignoring the decimal point in the display.
For example, if for each fifteen (15) pulses received you want the display to count once, the scaling
factor should be set as one fifteenth (0.06667).
Similarly, if for each pulse received you want the display to increment by ten (10) then a scaling factor
of 10 should be set.
Increasing the discrimination of the display
Once you have calculated the required scaling factor it may be advantageous to increase the
discrimination of the display. This can be achieved by moving the decimal point when setting the
scaling factor.
For example, in a system where metres need to be displayed and where twenty (20) pulses = one (1)
metre the scaling factor would be one twentieth (0.05). If this factor was used the display would
indicate metres only (displayed as 123456).
The discrimination can be increased by setting a scaling factor of 0.5 or 5, effectively multiplying the
displayed value by 10 or 100 respectively and then altering the position of the displayed decimal
point using the OFFSET facility (displayed as 12345.6 or 1234.56).
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Using the OFFSET facility (setting the decimal point in the display)
After setting the scaling factor, if the function button FUNC is pressed the display will show OFFSET
for one second followed by the value contained in memory. The digits and decimal point position are
altered as above and the position set for the decimal point is the position of the decimal point in the
final display.
If a non-zero offset value is entered then this value will be loaded into the display before counting
commences. This feature is used whenever it is required to add or subtract a constant from the
totalised count, for example to compensate for valve opening/closing delay.
Operating the instrument
(If the instrument is in SET mode, the RUN/SET button should be pressed once to return to RUN
mode).
The display will indicate RUN for 1 second and will then show the stored value that was retained
when power was removed from the unit.
NOTE: Going into SET mode causes the count to be reset to zero.
The display will be incremented or decremented, depending on whether the signal is received on the
count up (CU) input or count down (CD) input terminal, whenever the requisite number of pulses are
received.
The count can be reset to zero (0), or to the value as entered for OFFSET, at any time by connecting
the RESET (RST) input on the back panel to 0V (see page 6).
Alternatively, if the RESET input is permanently linked to 0v then the FUNC button on the front panel
can be used as a reset.
The instrument will increment or decrement the displayed count until it has filled all the decades.
Once a count of 999999 or -999999 is stored and displayed, the next count will cause the display
to read High.
If this situation arises any further received signals will be lost and the counter must be reset to zero
before operation can continue.
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