GREER Company MICROGUARD 434 Manual de programación
MicroGuard®434 System — Troubleshooting Manual PN W434800 Rev D 09/19/06
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MICROGUARD®434
RATED CAPACITY LIMITER
SYSTEM
TROUBLESHOOTING
MANUAL
MicroGuard®434 System — Troubleshooting Manual PN W434800 Rev D 09/19/06
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The Greer Company
The Greer Company is dedicated to the design and
manufacture of electronic parts created to aid in crane
operation and in the protection of crane operators and
associated personnel. The following manual has been
developed to assist in helping Service Personnel to
understand, locate, and identify problems that may
arise during the operation of the MicroGuard®434
Rated Capacity Limiter System. Persons using this
Manual must be familiar with this System and
with Electrical Servicing. Use of calibration routines
without consultation with the Greer Company
invalidates the warranty.
MicroGuard®434 System — Troubleshooting Manual PN W434800 Rev D 09/19/06
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TABLE OF CONTENTS
MicroGuard ®434
Rated Capacity Limiter System
TROUBLESHOOTING MANUAL
Introduction
SERVICE DEDICATION..................................................................INSIDE FRONT COVER
WHERE TO GO FOR HELP.............................................................................................4
SYSTEM DIAGRAM...........................................................................INSIDE BACK COVER
Section I
PREPARATION ................................................................................................................ 5
Section ll
PROBLEM FINDER TABLES ........................................................................................... 7
Section III
SYSTEM INSTALLATIONS ..............................................................................................23
Section IV
SYSTEM COMPONENTS AND ASSOCIATED FUNCTIONS........................................ 27
Section V
FAULT CODES............................................................................................................... 66
SECTION VI
SYSTEM DIAGRAMS..................................................................................................... 73
MicroGuard®434 System — Troubleshooting Manual PN W434800 Rev D 09/19/06
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When field repairs cannot be made without replacement of a part,
when troubleshooting advice is needed, or when corrections to
memory chips are reported, one of the following support numbers
should be called:
Link-Belt Construction Equipment Company
Product Support: Lexington, KY
Telephone:(606) 263-0241
FAX: (606) 263-5260
Greer Company
Service: Santa Ana, CA
Telephone:(714) 259-9702
FAX: (714) 259-7626
Information provided to support personnel must be accurate and
complete. Please follow the Troubleshooting Table guidelines.
Have your crane Model Number and Serial Number ready.
Carefully describe the problem, noting any unusual System
responses that may help us to quickly and effectively
solve your problem.
WHERE TO GO FOR HELP
MicroGuard®434 System — Troubleshooting Manual PN W434800 Rev D 09/19/06
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SECTION I
PREPARATION
This Troubleshooting Manual for the MicroGuard®434 Rated Capacity Limiter System,
manufactured by the Greer Company and installed on Link-Belt Construction Equipment Company
(LBCE) cranes, provides information and methods for isolating problems that may arise during
operation of the System. Some of these problems can be corrected in the field. Other problems may
require replacement of parts or a return of a part to the factory for servicing. Persons servicing this
System should have prior training and experience in the procedure for operation and setup of this
System.
Please refer to the MicroGuard®434 Operating Instructions in the LBCE Operator’s Manual and/or
the MicroGuard®434 Calibration Manual regarding questions relating to the operation or calibration
of this System. Accurate methods must be used to locate a problem. We recommend using the
PROBLEM FINDER TABLES in Section II to help locate and define a problem.
The procedures in this manual, where possible, are based on crane operation and function. A basic
tool kit consisting of wrenches and screwdrivers (flat and Phillips’ blades) will be required to remove
covers and units for inspection. A digital multimeter (DMM) may be required. The DMM must be
capable of measuring DC voltage with a range of 0 volts to ± 50 volts and resolution of 0.1 volts.
Resistance range is 0 Ohms to 2 Megohms. Low cost analog meters are not appropriate since the
input impedance of these meters can give false readings.
MicroGuard®434 System — Troubleshooting Manual PN W434800 Rev D 09/19/06
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THIS PAGE SHOULD BE BLANK.
MicroGuard®434 System — Troubleshooting Manual PN W434800 Rev D 09/19/06
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SECTION II
PROBLEM FINDER TABLES
These Problem Finder Tables are designed to aid in determining the location and type of
problem experienced. It is important to review these Tables carefully before contacting us.
SYSTEM SELF-TEST.................................................................................................................8
COMPUTER/DISPLAY COMMUNICATION ......................................................................9-12
DISPLAY OF FAULT CODES ....................................................................................... 13
CRANE MOTIONS ARE DISABLED............................................................................. 14
ANTI-TWO BLOCK CIRCUIT........................................................................................ 15
SWING POT SENSOR..................................................................................................16
BOOM EXTENSION SENSOR...................................................................................... 17
BOOM ANGLE SENSOR .............................................................................................. 18
PRESSURE TRANSDUCERS...................................................................................19-20
REMOTE BAR GRAPH................................................................................................. 21
MicroGuard®434 System — Troubleshooting Manual PN W434800 Rev D 09/19/06
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SYSTEM SELF-TEST
The Computer and Operator’s Display Console do a Self-Test when the power is turned on or
during operation when the ”TEST” button is pressed. The Self-Test verifies that the Computer,
Display Console, cables, and all remote sensors are working properly.
TEST SEQUENCE FOR DISPLAY CONSOLE:
1. Push TEST BUTTON (T). BLACK BAR GRAPH (B) spans entire window . All lights and all
7 SEGMENT DISPLAYS turn on and the ALARM sounds. Graphic Display (GD) reads:
“This is a Test.”
2. If no Fault (problem) is found, the System will start displaying Load, Radius, Angle, etc.
3. Faults discovered during Self-Test will cause the red and yellow lights to turn on. The
Graphics Display (GD) will read: “OUT OF SERVICE.”
4. The Operator then presses and holds the TEST button causing the Fault to be identified
with a FAULT CODE NUMBER (See Section V) in the Graphics Display.
CAUSES FOR COMMUNICATION FAILURE:
A) Bad connections between the Display Console and the Computer.
B) Incorrect voltage from the Computer to the Display Console.
C) Failure of the serial Transmit/Receive IC in either the Computer, Display Console, or
Remote Bar Graph Unit.
D) Failure of the Reset IC in either the Computer or Display Console.
E) The Computer is locked up and not working.
F) The Display is locked up and not working.
FIGURE 2.0
LIQUID
CRYSTAL
DISPLAYS
B
GD
T
MicroGuard®434 System — Troubleshooting Manual PN W434800 Rev D 09/19/06
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COMPUTER/DISPLAY COMMUNICATION
Communication problems are difficult to isolate because of the interaction between the Display
Console and the Computer. Failure of either unit causes malfunction of the Display Console. Such
problems need resolution before using the Problem Finding Tables.
Six wires, identified below and shown in the following diagram, connect the Computer to the
Display Console. (See Figure 4.8, page 40.)
FIGURE 2.1
COMMUNICATION
BLOCK DIAGRAM
DA Differential serial communication line
DB Differential serial communication line
RES Reset line from the display to the
computer
+VP Power to Operator’s Display
Console
0V Common return
0V Common return
COMPUTER
DISPLAY CONSOLE
D
A
DB
+VP
0V
RESET
TRANSCEIVER
IC5
TRANSCEIVER
IC6
5 VOLT
POWER
SUPPLY
5 VOLT
REGULATOR
CPU
“TEST”
Button
CPU
DISPLAYS BUTTONS
RELAYS
REMOTE BAR GRAPH
DA
DB
+5V
0V
MicroGuard®434 System — Troubleshooting Manual PN W434800 Rev D 09/19/06
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OPERATOR’S DISPLAY
CONSOLE
COMPUTER REMOTE BAR GRAPH
READS:
”This is a SELF-TEST.”
After Self-Test, the relays
turn on and allow crane
motions.
All lights turn on during Self-Test
and then return to normal.
Lamps on during Self-Test.
Audio alarm sounds during
Self-Test.
Bar Graph spans full window.
TEST button resets both
Computer and Display
Console.
Listen for the relay “Click.”
NORMAL OCCURRENCES
WHEN SYSTEM IS TURNED ON
OR
WHEN “TEST” BUTTON IS PUSHED.
OPERATOR’S DISPLAY
CONSOLE
COMPUTER REMOTE BAR GRAPH
Shows everything remaining
after Self-Test. Resets every 5 seconds. All lights on.
Lamps remain on. Relays click with every reset.
Audio alarm remains OFF.
TEST button resets both the
Computer and the Display. TEST button clicks the
relays.
The following tables describe the reactions of the Operator’s Display Console, Computer, and
Remote Bar Graph when 1 of the 6 wires has a simulated failure. The wires were disconnected one
at a time and the results recorded. These tables are intended to help identify a faulty wire or circuit.
EITHER DA OR DB IS OPEN TO THE DISPLAY
COMPUTER/DISPLAY COMMUNICATION CONTINUED
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