Digistar EZ 150 Bedienungsanleitung
Scale System
Troubleshooting Guide
for
Digi-Star Scales with
EZ 150, EZ 210 and EZ 320
Indicators
F3214B December 1997
Troubleshooting Guide
Table Of Contents
Symptoms
Digi-Star Indicators ........................ 1
Introduction .............................. 2
Indicator Flashes “±RANGE” .............. 3
Indicator Will Not Come On ................ 4
Indicator Will Not Weigh .................. 6
Indicator Unstable (Drifts) ................. 6
System Inaccurate ....................... 7
Indicator Will Not Balance (zero) ........... 9
Testing the Indicator Using Simulator ......... 9
Inspect Junction Box Wiring ................ 10
Test the Junction Box ..................... 10
Testing the Load Cells .................... 11
Load Cell Resistance Chart ................ 12
EZ 150
EZ 320
EZ 210
EZ Indicators
Introduction
There are many scale applications, each using a variety of load cells and indicators.
Platform (large decks and animal)
Mobile Grain Cart (3 or 4 point)
Stationary Mixer
Bulk Feed Tanks (poultry, veal)
Others
This guide includes troubleshooting flowcharts and step by step procedures for
troubleshooting problems commonly found with most Digi-Star scale systems.
Required Tools
Multimeter [AC/DC Volts and Resistance]
Simulator (sold by Digi-Star)
Small Screwdriver (straight blade)
#2 Phillips Screwdriver
Digi-Star Scales
The basic elements of the Digi-Star scale system are:
Indicator
Load Cells (3 to 8 cells per system)
Junction Box
Power Supply (Battery or AC/DC Converter)
Indicator Flashing
"+RANGE"
Remove Junction Box
Cable from Indicator
(J902)
Indicator is Defective
Return Indicator to Factory Check Junction Box
(see page 10)
Replace or Repair
Junction Box
Test Load Cells
(see pages 11-12)
Does Indicator
Stop Flashing
"+RANGE"
Is Junction
Box Good?
No Yes
No
Yes
Continue
Indicator Flashes “±RANGE”
EZ Series Indicator
1. With the power “ON” disconnect the junction box from indicator.
2. If indicator continues to flash ”±RANGE” replace the indicator.
3. If indicator stops flashing ”±RANGE” and stabilizes at a weight, reconnect the junction
box and inspect the junction box wiring (see page 10).
4. If all connections in the junction box appear good and the display continues to flash
”±RANGE”, disconnect all load cell wires from junction box.
5. If the display continues to flash ”±RANGE” and the indicator checked out OK the junction
box is defective. Replace the junction box and continue to test load cells to assure that
they have not been damaged (see page 11).
6. If the display stops flashing and stabilizes at a weight, the junction box is OK. Test Load
Cells (see page 11).
Indicator Will Not
Come On
Check for Bad Power Cord,
Bad Connection or Bad Ground
New Cord w/Green Stripe
Red Wire = POS+
Black Wire = Neg-
Replace Battery
with Known
Good Battery
Replace
Fuse
Replace AC/DC
Converter Check AC Circuit
Breaker, etc.
Check 12V
Voltage at
Source
Check Fuse
in Supply Check 110
VAC Outlet
Bad
Battery
Check for Bad
AC/DC Converter
(see note)
Good
Good
BadGood
Bad
Indicator will not come on
NOTE: A battery may check good with a meter but still
may not be strong enough to power the system.
Indicator Will Not Come On
Two conditions cause the indicator not to come on. They are:
No Power to Indicator (12 Volts DC)
Bad Indicator
No Power to Indicator
Check AC Power Source (if applicable)
Check outlet with a multimeter or plug in another device to the outlet to make sure there
is 110 volts present to the power supply.
Check for DC Power to Indicator
Measure the DC output of the power supply (or battery on mobile units) using a
multimeter. The indicator requires between 10.5 and 14.5 volts DC.
Make sure battery or power supply terminals are tight. Remove the power supply cover
and tighten terminals if necessary.
Check the fuse on the power supply (fuse may be on rear or inside power supply).
Make sure the RED wire is connected to the positive terminal and the BLACK wire
connected to the negative terminal of the DC power cable.
Remove the power connector from the indicator and use multimeter to measure
between PIN 1 (POS) and PIN 2 (NEG). The meter should read between 10.5 and 14.5
volts DC.
Mobile Applications
A bad vehicle ground or a weak battery can cause problems even if voltages check OK.
Connect the indicator to a known good power source (your service vehicle battery is a
goodchoice). If the indicator works OK, check into the vehicle battery and ground
connections or replace the battery.
If a tractor power cord is used, make sure that it’s RED wire is connected to the RED
wire of the indicator power cord and it’s BLACK wire is connected to the WHITE wire
of the indicator power cord.
Bad Indicator
If the above power checks are OK, replace the indicator.
Indicator Will Not Weigh
If the indicator flashes “LOW BAT” along the bottom of the display, turn to “Indicator Will Not
Balance” (page 9).
1. Test indicator using simulator. (See page 9)
2. Inspect the junction box wiring. (See page 10)
3. Remove load cells and test junction box. (See page 10)
4. Test the load cells. (See Page 11)
Indicator Unstable (Drifts)
Slow Drift
Variations of 50 lbs with 1" DB cells and up to 350 lbs on 2 ” DB and larger cells are normal
for most scale systems with daily temperature changes. Temperature compensated cells
minimize temperature drift but do not eliminate drifting entirely. Balance indicator before
use to prevent drift from causing inaccurate weight readings, except for feed bins where
you want to save inventory data. For feed bins, scale must be empty before balancing it.
Zero Track
EZ Series indicators with “Zero Track” turned on will hold the indicator on zero. “Zero
Track” is designed to compensate for slow changing variations on an empty scale (i.e.:
snowfall or temperature drift). “Zero Track” is not functional while weight is applied, or in
“NET” mode.
1. If rapid or intermittent changes in the display occurs, test the indicator by disconnecting
the junction box from the indicator and short pins 2 and 3 on the load cell jack.
• If the symptoms persist, replace the indicator.
2. Inspect the junction box wiring. (See page 10)
NOTE: Moisture inside the junction box can cause unstable or drifting readings.
3. Test the junction box. (See page 10)
4. Test the Load Cells. (See page 11)
Mobile Units
Uneven terrain causes weight shifts. Always seek smooth flat terrain to make weight
readings. Wheel alignment (toe-in/toe-out) can cause weight shift when unit moves (even
on smooth flat terrain).
System Inaccurate
Inaccurate systems are usually caused by:
Indicatorwith wrong set-up. (An indicator that was set up for another scale
application.)
Debris under/around mounts or structure.
Mounts, platform or cart not shimmed or supported properly to provide equal load
to each load cell.
Defective load cell.
Load cell up-side down. (new installations)
First, determine if the inaccuracy is caused by the indicator or something else. To do
this, stand in the middle of the scale and note your weight (tough for mobile systems).
Stand or hang at each load cell and note each reading. If the readings are all within 1
display count, the indicator is causing the problem.
If you find that one or more of the readings are more than 2 display counts different
from the others, then continue to one of the other possibilities in this section.
Indicator with Wrong Set-Up or Miscalibrated:
Verify that the indicator has the proper set-up. Compare the system configuration (size,
type and number of load cells) to the decal on the bottom of the indicator.
Inaccurate calibration: If the indicator needs re-calibration, it is best to contact your
dealer first. See scale operation manual for calibration instructions.
Debris Under/Around Mounts or Structure:
Readings will be less than actual if debris is lodged under or around the mounts and
platform.
Insure that the mounts, load cells and weighing structure are free of ice and debris.
Inspect around the edges of platform for any gravel or product that may have fallen
through the cracks around the deck.
On Weighmasters you can often clear the object without raising the deck. Use a piece
of stiff wire (like welding rod) and a needle nose pliers to dislodge debris.
System Inaccurate(continued)
Mounts, Platform or Cart Not Shimmed or Supported Properly to
Provide Equal Load at Each Load Cell:
On MOBILE applications, side pressure on a wheel or tongue can cause inaccurate
readings. Make sure wheels are on a level surface and there is no draw bar pull on
tongue.
On PLATFORM applications, use a large screwdriver or pry bar to pry up on the corners
of the deck. If one of the corners has noticeably less resistance, the deck may require
shimming or adjustment of the leveling screws (if present).
On FEED BIN applications, rock the bin back and forth, and check the mounts for any
movement or play. Insure that each mount has equal pressure and is secured to the slab.
Defective Load Cell:
If you suspect that you have a defective load cell, test them using the procedure on page
11.
Load Cell Up-Side Down:
If one load cell is mounted up-side down, the corner with the upside-down cell would read
negative. Visually check load cells for proper orientation (see below). The load cell should
deflect the same direction as the black arrow on the end of the cell.
NOTE: Each load cell is manufactured so that the cable comes off of the same side of the
cell (see diagram). Decals are also placed on the same side of each load cell.
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