AI-Tek Instruments TACHTROL20 T77250-10 User manual

TM5-250_B 1
LP0859X 10/10
TACHTROL
20
RATE METER MODEL T77250-10
• RATE INDICATION
• 6-DIGIT 0.56" (14.2 mm) HIGH RED LED DISPLAYS
• INPUT RATES UP TO 25KH
• ACCEPTS A WIDE VARIETY OF SENSORS
• PROGRAMMABLE SCALING
• PROGRAMMABLE UPDATE TIME
• PROGRAMMABLE DECIMAL POINTS
• NEMA 4X / IP65 SEALED FRONT BEZEL
GENERAL DESCRIPTION
The TACHTROL
20
Rate Meter, Model T77250-10, provides the versatilit and flexibilit needed to
accommodate virtuall an rate measuring application. The meter has the abilit to scale for direct
readout in terms of the units being measured. Whether a machine produces bottles, cloth, wire, or
beverage mix, operation is enhanced when the rate readout is expressed directl in bottles/min.,
feet/min., gallons/min., or whatever units are needed in plant applications.
The TACHTROL
20
can accommodate magnetic pickups, logic sensors, and NPN open collector sensors.
The pulses are received and scaled, so the desired displa can be achieved. The meter is programmed
through both the front panel buttons and DIP switches. Once the programming is complete, the front
panel buttons can be disabled b a DIP switch setting.
The meter has been specificall designed for harsh industrial environments. With a NEMA 4X/IP65 sealed
bezel and extensive testing to meet CE requirements, the meter provides a tough, et reliable application
solution.
SAFETY SUMMARY
All safet related regulations, local codes and instructions that appear in the literature or on equipment
must be observed to ensure personal safet and to prevent damage to either the instrument or equipment
connected to it. If equipment is used in a manner not specified b the manufacturer, the protection
provided b the equipment ma be impaired.
152 Knotter Dr.
Cheshire CT 06410 USA
PH: 203-271-6000 Fax: [phone]
www.aiteksensors.com
CAUTION:
Risk of Electric shock
CAUTION: Risk of Danger
Read complete instructions prior to
installation and operation of the unit.

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TABLE OF CONTENTS
Safet Summar …………………………………………………………..1
General Meter Specifications………………………..……………..2
Installing the Meter……………………………………………………….5
Setting the Switches……………….…………………………….….….6
Wiring the Meter…………………………………………………….……..7
Reviewing the Front Buttons and Displa …………………...9
Scaling the Meter ………………………………………………….……..9
Programming the Meter………………………………….……….….11
GENERAL METER SPECIFICATIONS
1. DISPLAY: 6-digit, 0.56" (14.2 mm), 7-segment red LED. Decimal points are programmed b front
panel ke s.
2. POWER:
AC Power: 115/230 VAC, switch selectable. Allowable power line variation ±10%, 50/60 Hz, 6 VA. @
100 mA max.
Isola ion: 2300 Vrms for 1 min. to input and DC Out/In.
DC Power: 10 to 16 VDC @ 100mA max.
3. SENSOR POWER: 9 to 17.5 VDC @ 100mA max.
4. KEYPAD: 3 programming ke s, the ▼ (Down Arrow) ke can also function as the front panel reset
button.
5. INPUT: (DIP switch selectable)
Accepts pulses from a variet of sources including NPN-OC, PNP-OC, TTL Outputs and Magnetic
Pickups.
Logic: Input trigger levels V
il,
= 1.5 V max.; V
ih
, = 3.75 V min.
Curren Sinking: Internal 7.8 KΩ pull-up to +12 VDC, I max = 1.9 mA
Curren Sourcing: Internal 3.9 KΩ pull-down, 8 mA max. @30 VDC max.
MAGNETIC PICK-UP:
Sensi ivi y: 200 mV peak
Hys eresis: 100 mV
Inpu impedance: 3.9KΩ @ 60 Hz
Maximum inpu vol age: 40 V pk-pk, 30 Vrms
6. INPUT FREQUENCY RANGE:
Max Frequency: 25 KHz
Min Frequency: 0.01 Hz
Accuracy: ±0.01%
7. MEMORY: Nonvolatile EEPROM retains all programmable parameters and displa values.

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8. ENVIRONMENTAL CONDITIONS:
Opera ing Tempera ure: 0° to 60°C
S orage Tempera ure: -40° to 60°C
Opera ing and S orage Humidi y: 0 to 85% max. relative humidit (non- condensing)
Vibra ion According o IEC 68-2-6: Operational 5 to 150 Hz, in X, Y, Z direction for 1.5 hours,
2g.
Shock According o IEC 68-2-27: Operational 30 g, 11 msec in 3 directions.
Al i ude: Up to 2000 meters
9. CERTIFICATIONS AND COMPLIANCES:
SAFETY
IEC 61010-1, EN 61010-1: Safet requirements for electrical equipment for measurement, control,
and laborator use, Part 1.
IP65 Enclosure rating (Face onl ), IEC 529
IP20 Enclosure rating (Rear of unit), IEC 529
ELECTROMAGNETIC COMPATIBILITY
Emissions and Immunit to EN 61326:2006: Electrical Equipment for Measurement, Control and
Laborator use.
IMMUNITY TO INDUSTRIAL LOCATIONS:
Electrostatic discharge EN 61000-4-2 Criteria
4 kV contact discharge A
8 kV air discharge
Electromagnetic RF fields EN 61000-4-3
10 V/m (80 MHz to 1 GHz) A
3 V/m (1.4 GHz to 2 GHz)
1 V/m (2 GHz to 2.7 GHz)
Fast transients (burst) EN 61000-4-4
2 kV power A
3
1 kV I/O signal
Surge EN 61000-4-5
power 1 kV L to L, 2 kV L to G A
3
RF conducted interference EN 61000-4-6
3 Vrms A
Power frequenc EN 61000-4-8
magnetic fields 30 A/m A
AC power Voltage dip EN 61000-4-11
0% during 1 c cle A
40% during 10/12 c cle C
70% during 25/30 c cle C
Short interruptions 0% during 250/300 c cles C
EMISSIONS:
Emissions: EN 55011 Class B
No es:
1. Criterion A: Normal operation within specified limits.
2. Criterion C: Temporar loss of function where s stem reset occurs.
3. EMI filter placed on the DC power suppl , when DC powered: Corcom #1VB3 or Schaffner #
FN610-1/07

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10. CONNECTIONS:
High compression cage-clamp terminal block.
Wire Gage Capaci y: 30-14 AWG copper wire.
Wire S rip Leng h: 0.3" (7.5 mm). Clamp screw Torque: 4.5 inch-lbs (0.51 N-m) max
11. CONSTRUCTION: This unit is rated for NEMA 4X/IP65 outdoor use. IP20 Touch safe. Installation
Categor II, Pollution Degree 2. One piece bezel/case. Flame resistant. S nthetic rubber ke pad. Panel
gasket and mounting clip included
12. WEIGHT: 12 oz (340 g)

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INSTALLING THE METER
INSTALLATION
The TACHTROL
20
meets NEMA 4X/IP65 requirements when properl installed. The unit is intended to be
mounted into an enclosed panel. Prepare the panel cutout to the dimensions shown below. Remove the
panel latch from the unit. Slide the panel gasket over the rear of the unit to the back of the bezel. The
unit should be installed full assembled. Insert the unit into the panel cutout.
While holding the unit in place against the panel, push the panel latch over the rear of the unit so that
the tabs of the panel latch engage in the slots on the case. The panel latch should be engaged in the
farthest forward slot possible. To achieve a proper seal, tighten the latch screws evenl until the unit is
snug in the panel (Torque to approximatel 7 in-lbs [79N-cm]). Do not over-tighten the screws.
INSTALLATION ENVIRONMENT
The unit should be installed in a location that does not exceed the maximum operating temperature and
provides good air circulation. Placing the unit near devices that generate excessive heat should be
avoided.
The bezel should be cleaned onl with a soft cloth and neutral soap product. Do NOT use solvents.
Continuous exposure to direct sunlight ma accelerate the aging process of the bezel.
Do not use tools of an kind (screwdrivers, pens, pencils, etc.) to operate the ke pad of the unit.
PANEL CUTOUT

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SETTING THE SWITCHES
The meter has DIP switches that must be checked and/or changed prior to appl ing power. To access
the power switch, remove the meter base from the case b firml squeezing and pulling back on the side
rear finger tabs. This should lower the latch below the case slot (which is located just in front of the finger
tabs). It is recommended to release the latch on one side, then start the other side latch
Power Selec ion Swi ch
Se -Up DIP Swi ches
A DIP switch is located at the rear of the meter, and is full accessible when the unit is in the case. It is
used for the selection of the input parameters and program disable.
SWITCH 1: SNK : Adds internal 7.8 KΩ pull-up resistor to +12 VDC, I = 1.9 mA. MAX
SWITCH 2: SRC : Adds internal 3.9 KΩ pull-down resistor, 8 mA max @30 VDC max
SWITCH 3: HI Frequency: Removes damping capacitor and allows max. frequenc .
LO Frequency: Limits input frequenc to 50 Hz and input pulse widths to 10 msec.
SWITCH 4: LOGIC: Input trigger levels V
IL
= 1.5 V max.; V
IH
= 3.75 V max.
MAG: 200 mV peak input (must have SRC on)
SWITCH 5: Enable Programming: Enables programming through the front panel buttons.
Disables Programming: Disables the front panel buttons from an programming changes.
SWITCH 6: No ac ive
Caution:
You
MUST
Insure the AC power selection switch is set for the proper voltage
BEFORE
powering-up the meter. The meter is shipped from the factory with the switch set in the 230
VAC position!!

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WIRING THE METER
WIRING OVERVIEW
Electrical connections are made via screw-clamp terminals located on the back of the meter. All
conductors should conform to the meter's voltage and current ratings. All cabling should conform to
appropriate standards of good installation, local codes and regulations. It is recommended that the power
supplied to the meter (DC or AC) be protected b a fuse or circuit breaker.
When wiring the meter, compare the numbers embossed on the back of the meter case against those
shown in wiring drawings for proper wire position. Strip the wire, leaving approximatel 0.3” (7.5 mm)
bare lead exposed (stranded wires should be tinned with solder.) Insert the lead under the correct screw-
clamp terminal and tighten until the wire is secure. (Pull wire to verif tightness.)
EMC INSTALLATION GUIDELINES
Although this meter is designed with a high degree of immunit to ElectroMagnetic Interference (EMI),
proper installation and wiring methods must be followed to ensure compatibilit in each application. The
meter should be mounted in a metal enclosure, which is properl connected to protective earth. The t pe
of the electrical noise, source or coupling method into the meter ma be different for various installations.
The meter becomes more immune to EMI with fewer I/O connections. Cable length, routing, and shield
termination are ver important and can mean the difference between a successful or troublesome
installation. Listed below are some EMC guidelines for successful installation in an industrial environment:
1. The meter should be mounted in a metal enclosure, which is properl connected to protective earth.
2. Use shielded (screened) cables for all Signal and Control inputs. The shield (screen) pigtail connection
should be made as short as possible. The connection point for the shield depends somewhat upon the
application. Listed below are the recommended methods of connecting the shield, in order of their
effectiveness.
a. Connect the shield onl at the panel where the unit is mounted to earth ground (protective earth).
b. Connect the shield to earth ground at both ends of the cable, usuall when the noise source
frequenc is above 1 MHz.
c. Connect the shield to common of the meter and leave the other end of the shield unconnected and
insulated from earth ground.
3. Never run Signal or Control cables in the same conduit or racewa with AC power lines, conductors
feeding motors, solenoids, SCR controls, and heaters, etc. The cables should be run in metal conduit
that is properl grounded. This is especiall useful in applications where cable runs are long and
portable two-wa radios are used in close proximit or if the installation is near a commercial radio
transmitter.
4. Signal or Control cables within an enclosure should be routed as far as possible from contactors,
control rela s, transformers, and other nois components.
5. In extremel high EMI environments, the use of external EMI suppression devices, such as ferrite
suppression cores, is effective. Install them on Signal and Control cables as close to the unit as
possible. Loop the cable through the core several times or use multiple cores on each cable for
additional protection. Install line filters on the power input cable to the unit to suppress power line
interference. Install them near the power entr point of the enclosure. The following EMI suppression
devices (or equivalent) are recommended:
Ferrite Suppression Cores for signal and control cables:
Fair-Rite # 0443167251
TDK # ZCAT3035-1330A
Steward # 28B2029-OAO
Line Filters for input power cables:
Schaffner # FN610-1/07
Schaffner # FN670-1.8/07
Corcom # 1 VR3
Note: Reference manufacturer’s instructions when installing a line filter.
6. Long cable runs are more susceptible to EMI pickup than short cable runs. Therefore, keep cable runs
as short as possible.
7. Switching of inductive loads produces high EMI. Use of snubbers across inductive loads suppresses EMI.

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POWER WIRING
AC power connections: DC power connections
Terminal 1: AC (L1) Terminal 3: DC OUT/IN (DC+)
Terminal 2: AC (L2) Terminal 4: COMM (DC-)
INPUT WIRING
Magne ic Pickup AC Inpu s From Tach
Genera ors, E c.
Two Wire Proximi y, Curren
Source
Curren Sinking Ou pu Curren Sourcing Ou pu In erfacing Wi h TTL
Emi er Follower; Curren
Source
* Switch position is application dependent.

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REVIEWING THE FRONT BUTTONS & DISPLAY
KEY DISPLAY MODE OPERATION PROGRAMMING MODE OPERATION
PAR Access Programming Mode Store selected parameter & index to next parameter
▲No Function Increment selected digit of parameter value
▼No Function Select digit position in parameter value
SCALING THE METER
RATE SCALING
To scale the Rate, enter a Scaling Displa value with a corresponding Scaling Input value. These values
are internall plotted to a Displa value of 0 and Input value of 0 Hz. A linear relationship is formed
between these points to ield a rate displa value that corresponds to the incoming input signal rate. The
location of the scaling point should be near the process end limit for the best possible accurac . The
TACHTROL 20 is capable of showing a rate displa value for an linear process.
SCALING CALCULATION
If a displa value versus input signal (in pulses per second) is known, then those values can be entered
into Scaling Displa (rt-dSP) and Scaling Input (rt-INP). No further calculations are needed.
If onl the number of pulses per 'single' unit (i.e. # of pulses per foot) is known, then it can be entered
as the Scaling Input value and the Scaling Displa value will be entered as the following:
NOTES:
1. If number of pulses per unit is less than 10, then multipl both Input and Displa values b 10.
2. If number of pulses per unit is less than 1, then multipl both Input and Displa values b 100.
3. If the Displa value is raised or lowered, then Input value must be raised or lowered b the same
proportion (i.e. Displa value for per hour is entered b a third less (1200) then Input value is a third
less of the number of pulses per unit). The same is true if the Input value is raised or lowered, then
Displa value must be raised or lowered b the same proportion. Both values must be greater than
0.0.
EXAMPLE:
1. With 15.1 pulses per foot, show feet per minute in tenths.
Scaling Displa = 60.0 Scaling Input = 15.1
2. With 0.25 pulses per gallon, show whole gallons per hour. (To have greater accurac , multipl
both Input and Displa values b 10)
Scaling Displa = 36000 Scaling Input = 2.5
RATE PER DISPLAY (rt -dSP) INPUT (rt - INP)
SECOND 1 # PULSES PER UNIT
MINUTE 60 # PULSES PER UNIT
HOUR 3600 # PULSES PER UNIT

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RATE DISPLAY OVERFLOW
The rate of the input signal along with the programmed scaling values can cause the
calculated rate displa to exceed the meter's 6-digit capacit . If this occurs, the displa will
show "OLOLOL" to indicate an overflow condition.
INPUT FREQUENCY CALCULATION
The meter determines the input frequenc b summing the number of falling edges received
during a sample period of time. The sample period begins on the first falling edge. At this falling
edge, the meter starts accumulating time towards Low Update and High Update values. Also,
the meter starts accumulating the number of falling edges. When the time reaches the Low
Update Time value, the meter looks for one more falling edge to end the sample period. If a
falling edge occurs (before the High Update Time value is reached), the Rate displa will update
to the new value and the next sample period will start on the same edge. If the High Update
Time value is reached (without receiving a falling edge after reaching Low Update Time), then
the sample period will end but the Rate displa will be forced to zero. The High Update Time
value must be greater than the Low Update Time value. Both values must be greater than 0.0.
The input frequenc calculated during the sample period, is then shown as a Rate value
determined b either scaling method.