Cooper Instruments LTL720-350K Installation Manual
LTL 720
Dyna Link Tension
Load Sensor
User’s Guide
www.cooperinstruments.com
PH: 540-349-4746 • FAX: 540-347-4755
CONTENTS
INTRODUCTION ..........................................................................................................................1
UNPACKING................................................................................................................................1
INSTALLATION ...........................................................................................................................1
BATTERIES .................................................................................................................................1
OPERATION ................................................................................................................................2
DIGITAL DISPLAY.......................................................................................................................2
POWER SWITCH .........................................................................................................................2
ZERO SWITCH.............................................................................................................................2
PEAK............................................................................................................................................3
SET POINTS ................................................................................................................................3
To Enable SET-POINTS ........................................................................................................................3
SET-POINT Examples ........................................................................................................................... 4
To Disable a SET-POINT....................................................................................................................... 4
UNIT(S) ........................................................................................................................................4
SETUP/CAL .................................................................................................................................5
CLEAR/CANCEL .........................................................................................................................5
END ..............................................................................................................................................5
CALIBRATION UNIT(S)...............................................................................................................5
CALIBRATION.............................................................................................................................6
RCAL (OPTIONAL)......................................................................................................................6
TO CALIBRATE USING RCAL....................................................................................................7
FINE CALIBRATION....................................................................................................................8
AUTOMATIC POWER OFF (“AOFF”).........................................................................................8
AUTOMATIC ZERO TRACKING (“AZT”) ...................................................................................8
ERROR CODES ...........................................................................................................................9
RS232 (EIA232D) SERIAL OUTPUT ...........................................................................................9
ANALOG OUTPUT (OPTION) ...................................................................................................10
SPECIFICATIONS......................................................................................................................11
OPTIONS & ACCESSORIES.....................................................................................................11
SERVICE INITIALIZATION PROCEDURE ................................................................................12
INITIAL CAL...............................................................................................................................12
PROPER LOADING PROCEDURE ...........................................................................................14
WARRANTY REPAIR POLICY..................................................................................................14
Limited Warranty On Products .......................................................................................................... 14
Obtaining Service Under Warranty....................................................................................................15
Repair Warranty ..................................................................................................................................15
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INTRODUCTION
The LTL Dyna-Link Tension Load Sensor represents advancement over earlier electronic attempts to replace
mechanical Dynamometers. The Series 720 Dyna-Link models offer standard features not found on mechanical
dynamometers.
Standard Features:
• Rugged construction
• Very long battery life. 500 hours on two standard “C” cells
• All functions and units are clearly annunciated on the Liquid Crystal Display. Digits are 1” high for easy distant
viewing
• Two user programmable Set Points can be used for safety and warning applications or for limit weighing. An
optional relay unit is available for interfacing the Dyna-Link to sirens, strobes, motors, etc.
• All commonly used internationally recognized units are available: pounds (lb), kilograms (kg), Short Tons (t),
Metric tons and dekaNewtons (daN)
• Digital calibration for easy maintenance
• Available with standard and remote displays
• Memory backup for Calibration, Setup parameters, and Set-Points
• The remote display version is available with optional RS232 output for printer or computer interfacing
UNPACKING
On receipt, be sure all parts ordered are included. A standard system will include the following:
Standard Dyna-Link Systems
1. 1 ea. LTL-720 Dyna-Link indicator
2. 2 ea. “C” cell alkaline batteries
3. 2 shackles (Optional)
4. Carrying Case (Optional)
Remote Dyna-Link Systems
1. 1 ea. LTL-720 load cell with pendant cable (typically 25’)
2. 1 ea. LTL-720 remote hand-held indicator (single and dual display)
3. 2 ea. “C” cell alkaline batteries
4. 2 shackles (Optional)
5. Carrying Case (Optional)
INSTALLATION
The Dyna-Link can be installed into a variety of applications. Its primary application is measuring tension in load
monitoring and certification applications.
WARNING: Due to the lack of any swivel fittings, it is important that all torque loads are kept to a minimum. The
use of properly rated fittings is imperative for safety and performance. The LTL-720 Dyna-Link are sized for
industry-standard shackles.
BATTERIES
A low battery lamp will appear when the expected life is approximately 60 hours. At approximately 10 hours
remaining, the lamp will start to blink. If the power is to low, the unit will automatically power down.
To Remove/Replace the Batteries
1. Remove the yellow battery cap in the load cell body.
2. Remove the batteries by tilting the load cell body slightly.
3. Replace the batteries with 2 fresh alkaline “C” cells, positive end first.
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4. Replace the battery cap. Ensure that the yellow cap is screwed in all the way to maintain sealing.
Note: The O-ring should be lubricated with O-ring lubricant periodically.
OPERATION
The Dyna-Link operates in two modes:
1. Gross Tension mode measures the current tension on the Link.
2. Peak Tension stores the highest reading the Link has measured. The display is only updated when a higher
value is measured.
DIGITAL DISPLAY
The Dyna-Link Liquid Crystal Display (LCD) is used for tension
indications as well as setup and error messages. During tension
measurement, the digits can indicate a maximum of four digits of
tension. When the reading exceeds four digits the”x1000”
annunciator and decimal point will light indicating that the
readings should be multiplied by 1000. This “auto-ranging”
takes place in higher capacity Dyna-Links, 10000 lbs, kgs, or
daNs and up. The LCD has annunciators for the Peak Mode,
Low Battery, and Units.
POWER SWITCH
Function:
Turns the unit On and Off.
Action:
1. Push POWER
2. Display Check: All segments and LED’s are illuminated for 1 second.
3. The LCD displays the software version number for 1 second.
Final:
The unit reads the current tension in the last set mode – Gross Tension or Peak Tension.
ZERO SWITCH
Function:
Sets the Zero reading of the Dyna-Link.
Rules for Use:
1. The Dyna-Link must be stable within 2 display counts. If the reading is not stable, the zero button will not
function.
2. The Dyna-Link will accept a zero setting up to full capacity. Zero settings will subtract from the overall capacity
of the Dyna-Link. For example, if you zero out 1000 lbs on a 5000 lb Dyna-Link, the overall capacity will be
reduced to 4000 lbs (plus the allowed over-range amount – usually 9 divisions).
Action:
Push ZERO to zero the reading.
Final:
The digits display “0” (or 0.0, 0.00, or 0.000 depending on the resolution).
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PEAK
Function:
Toggles between the Peak Tension and the Gross Tension modes.
Action:
1. Push PEAK
2. Display annunciator “PEAK” lights indicating Peak Tension mode. The “NEW PEAK” LED flashes while new
peak values are being recorded.
3. The last stored peak reading is displayed.
Final:
The LCD digits update only when a higher peak reading is obtained when a new higher reading is obtained, the
“NEW PEAK”LED will flash four times.
To Clear the Peak
Action:
While in the Peak Hold Tension mode, push ZERO.
Final:
The old Peak value is cleared; the digits display the current gross tension as a new peak. The “NEW PEAK”LED
flashes to indicate a new peak being stored.
To Turn Off the Peak Mode
Action:
Push PEAK. The “PEAK” annunciator will go out.
Final:
The previous peak reading is retained even in the normal reading mode and power off modes. The last stored
peak reading will be lost if the batteries are removed.
SET POINTS
The Dyna-Link is equipped with the capability of storing two Set Points. When the tension falls above or below
(depending on setting) the Set-Point value, the Dyna-Link responds by blinking an LED and by turning on a logic
output. This output can be used to interface to relays, lights, sirens, etc. (Contact Cooper for more details). Typical
uses for the Set Points include overload warnings, limit checking, and check weighing. Cooper provides an
optional relay interface box – AC power supply for easy Set-Point interfacing. During Set-Point entry the POWER
key will operate as an ENTER key, the ZERO key will operate as the DOWN selection key, the PEAK key will
operate as the UP selection key and CLEAR/CANCEL is initiated by pushing the ZERO and PEAK keys at the
same time (the SETUP/CAL key in the rear panel also functions as CLEAR/CANCEL).
Remote Units Only: The “*” key functions as the CLEAR/CANCEL key during all Set-Point and Setup functions.
The two Set-Points are designated SP1 and SP2 (the digit 5 is used to resemble an ‘S’).
To Enable SET-POINTS
1. Turn the Dyna-Link off.]
2. Hold down the PEAK key and turn the Dyna-Link on. After 1 second let up on the PEAK key.
3. The display will read “Unit”. Push UP (PEAK) or DOWN (ZERO) to select Set-Point 1 (“SP1”) or Set-Point 2
(“SP2”).
4. Push ENTER (POWER). You are now in the Set-Point Mode entry menu.
5. The display will start to flash the current Set-Point Mode of either “HI”,”LO”, or “OFF”. Push the UP or DOWN
key to change the mode. Low (LO) will trigger an alarm if the tension falls below the entered Set-Point value.
High (HI) will trigger if the tension rises above the entered Set-Point value. A third choice of “OFF” is used to
disable the Set-point.
6. Push ENTER (POWER) to set the Set-Point Mode.
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