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5 

 

Vs

 =   Supply voltage, passed through from power connector, or apply 12-30Vdc to power 

unit).  

0V

 =   0V/ground passed through from power connector or connect to 0V if powering unit 

from rear terminals. 

RST

 =  Reset input. Used to reset the latching alarms on “L” models and to release the 

settings lock on all 2000T models. Connect to 0V to activate the reset. 

M

 =  Mode change input. Used to toggle between active modes (all modes with a scaling 

factor not equal to zero). Connect to 0V momentarily to change to the next 

configured mode. 

AL1

 = Alarm Output 1. The alarm direction and threshold are user set. 

AL2

 = Alarm Output 2. The alarm direction and threshold are user set. 

IPa

 =   Signal Input A. Input type (standard, high sensitivity or reed switch) & sensitivity user 

set, independently of channel B. 

IPb

 =   Signal Input B. Input type (standard, high sensitivity or reed switch) & sensitivity user 

set, independently of channel A. 

Ao

 =   Analogue output. The type and range of the analogue output is determined by the 

user selected option (setting A OUT). 

Do 

=   Digital output. As standard this will provide a pulse to Vs at a scaled frequency, 

determined by the user set division factor (setting D OUT). 

NC 

=   No connection. 

 
 
 

Содержание 2000 MKIII Series

Страница 1: ...1 2000 MKIII SERIES Tachometers Model 2000T DC User Guide ...

Страница 2: ...z maximum with dual inputs 200Hz in Reed Mode Impedance 15kΩ minimum Accuracy 0 01 with square wave at 1V peak Alarms 60Vdc maximum sink of 150mA maximum Digital Output Pulse to supply internal 4 7kΩ pull up to supply or sink of D option only 150mA maximum Analogue Voltage Current User selectable as 0 5V or 1 5V or 0 10V or 2 10V A option only 0 20mA or 4 20mA Connections Screw terminals on rear p...

Страница 3: ...isplay speed for instance in m s mph or RPM or the frequency can be related to another measurement such as flow rate e g litres min in the case of flow metering applications The display can operate in one of four modes Frequency A Frequency B Ratio A B Ratio B A Each mode has independent settings and the active mode can be switched by the user during operation The 2000T MKIII has 2 configurable al...

Страница 4: ...ws the rear panel of a standard 2000T MKIII instrument The actual terminals available on the rear panel will vary depending on the model Below are the definitions of each of the terminals that may be present Refer to the terminal labels on the instrument and match these with the functions below Settings Increment reset Select ...

Страница 5: ...change to the next configured mode AL1 Alarm Output 1 The alarm direction and threshold are user set AL2 Alarm Output 2 The alarm direction and threshold are user set IPa Signal Input A Input type standard high sensitivity or reed switch sensitivity user set independently of channel B IPb Signal Input B Input type standard high sensitivity or reed switch sensitivity user set independently of chann...

Страница 6: ...the mode The value 𝐷 calculated according to the equations above will be shown on the display with each update Where this manual refers to the scaled frequency value it is this result that is considered e g alarm outputs analogue output Choice of CALC setting In most cases the 2000T has sufficient digits to accurately represent the scaling factor whether it is multiplicative or reciprocal and the ...

Страница 7: ...r Gear in RPM 𝐷 𝑅 𝑆 𝑆 where 𝑁 is the number of teeth on the target gear Flowmeter in litres per minute lpm 𝐷 𝑆 where 𝐾 is the flowmeter K factor in pulses per litre Vehicle speed e g km per hour miles per hour 𝐷 𝑅 𝑆 𝑆 where 𝑠 is the distance travelled per rotation of the target gear 𝑁 is the number of teeth on the target gear The scaling factor range is 0 000001 to 9999999 unsigned or 999999 to 99...

Страница 8: ...to set negative offset values Decimal Places The decimal point position can be user set for each mode and adjusted to either increase or reduce the number of decimal places displayed The result will automatically be rounded to the set number of decimal places Alarms and other outputs will however always use the calculated result and not the rounded display value The number of decimal places is alt...

Страница 9: ...nger meets the selected criteria If specified at time of ordering type L a 2000T can be supplied with a latching facility for the alarm outputs Resetting the outputs is then performed by grounding the reset terminal RST on the rear panel or reset via the front panel Mode Selection The 2000T tachometer will operate in any one of four modes each of which has independent settings The four modes are 1...

Страница 10: ... value in the selected range Scaled frequency values at or above the full scale value will be set to the maximum value in the selected range In between the reference and full scale values the analogue output will be set linearly according to the reference full scale and scaled frequency value Digital Output D models are configured with a digital output terminal This digital frequency divider provi...

Страница 11: ...Once all settings have been stepped through or skipped the unit will return to setting 1 The unit will remain in set mode until run mode is entered as described above Each mode has an independent set of settings and after the mode is selected the set values will be applied to that mode only The exceptions to this are the input type INPUT which is available in Frequency A and Frequency B mode only ...

Страница 12: ...ssing increment In signed mode after cycling through all six digits all digits will flash and the sign can be toggled by pressing increment Press select once the sign is set to then set the decimal point position For the mode to be viewable via the mode select button the scaling factor must have a non zero value Set all digits to 0 on all four frequency modes to restore default settings the positi...

Страница 13: ... activated Press select to select digit and increment to change value The decimal point position is locked to the display value set under DISP DP In signed mode after cycling through all six digits all digits will flash and the sign can be toggled by pressing increment Press settings at any time to move to the next setting 9 ALARM 2 Set alarm output 2 direction and threshold value This is configur...

Страница 14: ... after cycling through all six digits all digits will flash and the sign can be toggled by pressing increment The number of decimal places is limited by the DISP DP setting Press settings at any time to move to the next setting 13 D OUT Set the digital frequency divider factor Default 0 This can be set anywhere between 0 digital output off and 1 digital output frequency equal to the input frequenc...

Страница 15: ...ings or select to return to the mode setting Setting the Sensitivity Default 50 The sensitivity can only be altered in Frequency A mode or Frequency B mode and this will set the sensitivity value for the respective input only Press and hold the settings button then press the select button to enter sensitivity mode The display will show SENS and then the current value is displayed Sensitivity range...

Страница 16: ...entering set mode the lock will be released LOCKED set to NO Select YES from the LOCKED setting to re activate the settings lock Setting the Sensitivity The sensitivity can only be altered in Frequency A mode or Frequency B mode and this will set the sensitivity value for the respective input only Press and hold the settings button then press the select button to enter sensitivity mode The display...

Страница 17: ...s shown as the black wire below Connect the other wire from the magnetic pickup to the input Adjust sensitivity to ensure that the correct value displayed at the minimum rotational speed Either IPa or IPb can be used for single channel operation Single Channel Operation Dual Channel Ratio Operation Vs IPb 0V IPa 0V NC NC NC NC NC 0V Gear Wheel or Flowmeter Magnetic Pickup Screen Vs IPb 0V IPa 0V N...

Страница 18: ...ot connected to 0V at the sensor encoder end The signal can be connected to either IPa or IPb for single channel operation Reed Switch Set input type INPUT to reed switch REED Connect one switch terminal to the supply voltage Vs and the other to the input terminal IPa or IPb for single channel operation The maximum frequency is limited to 200Hz Adjust the sensitivity until the correct value is dis...

Страница 19: ...ons Example alarm configurations are shown below NOTE Switching Relays If the relay module does not have integrated back EMF suppression it is essential that a diode is connected across the coil as shown in the diagrams ...

Страница 20: ... 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 o...

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