Logitech Electronics 2000 MKII Series User manual

2000 MKII SERIES™
Tachometers
Model 2000V
User Guide!

Addendum to 2000 SERIES Tachometer User's Guide
The 2000V is a variation on the standard 2000T tachometer. It measures the time between pulses
generated by an object passing between two sensors and from this calculates the velocity of the
object.
The two pulses are usually applied to input A (I/Pa) and input B (I/Pb) - terminals 10 and 12 on the
rear of the instrument, although it is possible to combine the two signals and apply them to input A
only.
The unit will calculate 1/tand multiply this by the scaling factor. In order to display velocity in the
chosen units, it is necessary to enter an appropriate scaling factor:
e.g. distance between start and stop pulse is 2.5m, velocity required in m/s.
v = d/tso scaling factor is simply 2.5
To give a display to one decimal place:
Enter 25 for scaling factor and set the decimal place in the display by entering 0.0 as offset.
The scaling factor is initially factory set to zero, which forces the user to enter a valid number before
the instrument can be used. When power is first applied the display will show GATE …. SET ….
RESET ( …. signifies a one second delay before the display changes).
If the unit is required to reset automatically then the number of seconds delay is entered as the
RESET value.
If the display should hold the measured value until a manual reset pulse is given, then this value
should be set to zero.
As the FUNC button is pressed the display will show SCALE allowing the scaling factor to be
entered.
When the FUNC button is pressed again the display will show OFFSET. Usually, this feature will
only be used to set the position of the decimal point as required in the display of the measured value
(see page 9).
Further operations of the FUNC button allow a low and a high alarm value to be set (if required).!
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Contents
Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Safety information for EU users . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Transformer connections (230V/115V AC selection) . . . . . . . . . . . . 6
Switches and connections
Run/Set Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Function (FUNC) Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
DP Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
0-9, +/- Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Rear Panel Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Mode Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Sensitivity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Alarm Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Mains Earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Programming the instrument
Calculating a scaling factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Setting a scaling factor for the first time. . . . . . . . . . . . . . . . . . . . . . 10
Altering programming on an instrument
that has been previously scaled . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Increasing the discrimination of the display . . . . . . . . . . . . . . . . . . 11
Setting an Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Output options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Diagrams
Front & rear panel layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Connection diagrams - typical applications . . . . . . . . . . . . . . . . . . .15
Alarm output connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Additional information
Electromagnetic Precautions & Low Voltage Directive . . . . . . . . . 18
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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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 (A and B)
Standard
Standard sensitivity 180mV to 10V — protected to 100V
Frequency 30kHz maximum with single input, or 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 Opto-isolated — requires sink to 0V of 220W maximum.
Mode change (frequency A, frequency B, ratio A/B, ratio B/A
Reset (if optional latching alarm has been specified)
Outputs
Standard
Transducer supply 10V DC nominal unregulated @ 80mA max
High and Low Alarms Open collector 200mA @ 60V 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 Tachometers can also be powered by providing 10V to 15V DC @
300mA max via the 10V terminal (refer to WARNING on page 13)
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™ Tachometers 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 6).
Two signal inputs are available, Input A (I/Pa) and Input B (I/Pb). The two inputs can be scaled
independently but they share a common Sensitivity Control. If using only a single input signal then
this should be connected to Input A (I/Pa).
2000T MKII SERIES™ Tachometers are available with several factory fitted options which must be
specified when ordering – see Specification on page 4 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 9). 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.
RUN mode. When the instrument is in this mode the Tachometer will display the measured signal.
Pressing this switch changes the Tachometer to the SET mode and activates the DP, the 0–9 and the
+(polarity) switches (see Setting a Scaling Factor on page 10).
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 (see Setting a Scaling Factor on page 10).
Pressing the FUNC switch steps through the parameters in the following sequence:
If the RUN/SET switch is in the RUN mode, and the instrument is displaying a measured value, a
single depression of the FUNC switch will step the display automatically through all the programmed
parameters at a pre-determined rate of approximately one per second.
On completion of this cycle the display will return to the measured value.
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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SCALE ….
Scaling Factor
…. OFFSET
ALA L
Alarm Low
ALA H
Alarm High

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
Mode Switches
The user must connect an external switch between Mode 0 (terminal 7) and/or Mode 1 (terminal 8) to
0V (terminal 9 Common) to obtain the required function as shown in the table below:
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Mode 1
Mode 0
Function
Open
Open
Frequency A
Ground
Open
Frequency B
Open
Ground
Ratio A/B
Ground
Ground
Ratio B/A
AL
LOW alarm (Open Collector 200mA 60V max.)
AH
HIGH alarm (Open Collector 200mA 60V max.)
0V
Common
Mains Earth
10V
+10V DC (unregulated) @ 80mA
RST
Reset Alarm (If Latching Alarm option is specified)
M0
Mode 0
M1
Mode 1
0V
Common
I/Pa
Signal A
0V
Common
I/Pb
Signal B
"

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.
Alarm Outputs
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.
If specified at time of ordering, a 2000T can be supplied with a latching facility for the alarm outputs.
Resetting the outputs is then performed by grounding terminal 6 (RST) on the rear panel.
Mains Earth
2000 MKII SERIES™ 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 common terminal 3 (0V) — see also
Safety information for EU users on page 6 and Electromagnetic Precautions on page 18.
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
Calculating a Scaling Factor
The displayed value is calculated as D = Sr 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 11.
The scaling factor is then calculated as: displayed value divided by input frequency
The scaling factor range is 0.00001 to 999999 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, instruments are normally supplied from the factory with all settings
programmed to zero.
On power up for the first time the display will show freq A …. SET …. SCALE …. 0 (....
signifies a one second delay before the display changes) and will be in the set mode awaiting
programming as required.
If the RATIO functions are needed, then a link(s) must be fitted on the terminal block as appropriate
— see MODE Switches on page 8.
To enter the scaling factor, simply use the 0–9 switches under the appropriate decade until the
correct figure is displayed. The decimal point should then be positioned as required by use of the DP
switch.
If other parameters need to be programmed (see the following sections), step to each one in turn by
pressing the FUNC switch to display the parameter that is to be programmed and enter the values
using the 0–9 switches for each decade as required.
When all parameters have been programmed to the required values return to the RUN mode by
pressing the RUN/SET switch.
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