Scaletron AccuPro-5000 User manual

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
All Rights Reserved
Page 1of 63
Scaletron Industries, LTD
53 Appletree Lane
Plumsteadville, PA 18949
All information contained in this document is confidential to Scaletron Industries, Ltd. No license is expressed
or implied, under any patent, copyright or trade secret right is granted or implied by the conveyance of this
document. No part of this document may be reproduced, transmitted, transcribed, stored in a retrieval
system, translated into any language or computer language, in any form or by any means, electronic,
mechanical, magnetic, optical, chemical, manual, or otherwise without the prior written permission of
Scaletron Industries, Ltd.
AccuPro-5000™
Measurement System
Operator Manual

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
All Rights Reserved
Page 2of 63
Table of Contents
1Introduction..................................................................................................................................................................6
1.1 Scope ......................................................................................................................................................................6
1.2 Acronyms and Abbreviations..............................................................................................................................6
1.3 Definitions.............................................................................................................................................................7
2System Specification Summary.................................................................................................................................. 8
3Assembly and Set-Up Instructions ..........................................................................................................................11
3.1 Factory Configuration........................................................................................................................................12
3.2 Control-Panel Preparation and Mounting......................................................................................................12
3.3 External Connections.........................................................................................................................................13
4System Hardware .......................................................................................................................................................14
4.1 Liquid Crystal Display (LCD) Board................................................................................................................14
4.2 Backplane Board.................................................................................................................................................15
4.3 Main Processor Board........................................................................................................................................17
4.4 Analog Input Board............................................................................................................................................19
4.5 Analog Output Board (4-20 mA Output)........................................................................................................20
4.6 Analog Output Board (0-5V/10V Output) ......................................................................................................22
4.7 Relay Output Board (Dual or Quad Relays) ...................................................................................................24
5User Controls ..............................................................................................................................................................25
5.1 Keypad .................................................................................................................................................................26
5.2 Rotary Knob ........................................................................................................................................................26
6User Indicators ...........................................................................................................................................................26
6.1 LCD Module ........................................................................................................................................................26
6.2 Channel Status LED Array ................................................................................................................................26
7System Modes .............................................................................................................................................................28
7.1 Run Mode ............................................................................................................................................................28
7.2 Setup Mode .........................................................................................................................................................28
8System Main Menu ....................................................................................................................................................29
8.1 Scale Display .......................................................................................................................................................32
8.2 Alerts/Alarms .....................................................................................................................................................32
8.3 Dead Weight........................................................................................................................................................35

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
All Rights Reserved
Page 3of 63
8.4 Calibrate Weight.................................................................................................................................................37
8.5 Capacity Weight..................................................................................................................................................39
8.6 System Config .....................................................................................................................................................40
8.7 Channel Config ...................................................................................................................................................43
8.8 Liquid Mass.........................................................................................................................................................45
8.9 Tare Adjust / Tare Secured ...............................................................................................................................47
8.10 Relay Setpoint.....................................................................................................................................................49
8.11 mA/V Output ......................................................................................................................................................52
8.12 Real-Time Clock .................................................................................................................................................54
8.13 About....................................................................................................................................................................57
9Maintenance................................................................................................................................................................59
9.1 Cleaning...............................................................................................................................................................59
9.2 Servicing the Control-Panel..............................................................................................................................59
9.3 Removing/Installing a Printed Circuit Board ................................................................................................59
9.4 Removing/Installing PCB Wire Connections.................................................................................................60
10 Troubleshooting .....................................................................................................................................................60
10.1 The Control-Panel is Not Receiving Power.....................................................................................................60
10.2 The Measurement Value is Blinking................................................................................................................61
10.3 The 4-to-20 mA Reading is Incorrect..............................................................................................................61
10.4 A Relay Output is Not Responding Correctly.................................................................................................62
10.5 Tare Weight Drift ...............................................................................................................................................62
11 Revision Log................................................................................................................................................................63

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
All Rights Reserved
Page 4of 63
Figure 1: LCD Board (Bottom Side).......................................................................................................................14
Figure 2: Backplane Board......................................................................................................................................16
Figure 3: Main Processor Board.............................................................................................................................18
Figure 4: Analog Input Board.................................................................................................................................20
Figure 5: Multiple Current AOBs with Shared Loop Power Supply..................................................................21
Figure 6: Analog Output Board - mA.....................................................................................................................22
Figure 7: Analog Output Board - V ........................................................................................................................23
Figure 8: Relay Output Board.................................................................................................................................24
Figure 9: Control-Panel Overlay (Keypad Version).............................................................................................25
Figure 10: System Menu Displays..........................................................................................................................29
Figure 11: Action Canceled Display........................................................................................................................30
Figure 12: SCALE DISPLAY Menu Option ...........................................................................................................32
Figure 13: Single versus Dual-Channel Measurement Display..........................................................................32
Figure 14: ALERTS/ALARMS Menu Option........................................................................................................33
Figure 15: ALERTS / ALARMS Messages.............................................................................................................34
Figure 16: DEAD WEIGHT Menu Option.............................................................................................................35
Figure 17: DEAD WEIGHT Control Flow Diagram .............................................................................................36
Figure 18: CALIBRATE WEIGHT Menu Option .................................................................................................37
Figure 19: CALIBRATE WEIGHT Control Flow Diagram..................................................................................38
Figure 20: CAPACITY WEIGHT Menu Option....................................................................................................39
Figure 21: CAPACITY WEIGHT Control Flow Diagram.....................................................................................40
Figure 22: SYSTEM CONFIGURATION Menu Option ......................................................................................41
Figure 23: SYSTEM CONFIGURATION Control Flow Diagram.......................................................................42
Figure 24: CHANNEL CONFIGURATION Menu Option ..................................................................................43
Figure 25: CHANNEL CONFIGURATION Control Flow Diagram...................................................................44
Figure 26: Bar-Graph Display ................................................................................................................................45
Figure 27: LIQUID MASS Menu Option...............................................................................................................46
Figure 28: LIQUID MASS Control Flow Diagram...............................................................................................47
Figure 29: TARE ADJUST & TARE SECURED Menu Option...........................................................................48
Figure 30: TARE ADJUST Control Flow Diagram ..............................................................................................48
Figure 31: TARE SECURED Control Flow Diagram............................................................................................49
Figure 32: RELAY SETPOINT Menu Option .......................................................................................................50
Figure 33: RELAY SETPOINT Control Flow Diagram........................................................................................51
Figure 34: mA/V OUTPUT Menu Option.............................................................................................................52
Figure 35: mA/V OUTPUT Control Flow Diagram .............................................................................................53
Figure 36: REALTIME CLOCK Menu Option......................................................................................................55
Figure 37: Setting the Time/Date Control Flow Diagram ..................................................................................56
Figure 38: ABOUT Menu Option ...........................................................................................................................57
Figure 39: ABOUT Control Flow Diagram............................................................................................................58

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
All Rights Reserved
Page 5of 63
Table 1: External Alarm Interface ................................................................................................................ 17
Table 2: System Mode Controls ................................................................................................................... 17
Table 3: Load-Cell Interface......................................................................................................................... 19
Table 4: Leak-Detect Sensor Interface......................................................................................................... 19
Table 5: Current Loop Interface................................................................................................................... 21
Table 6: Voltage Output Interface................................................................................................................23
Table 7: Relay Interface................................................................................................................................24
Table 8: Alerts/Alarms Priority Levels ........................................................................................................27
Table 9: Operational Menu Tree .................................................................................................................. 31

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
All Rights Reserved
Page 6of 63
1Introduction
The AccuPro-5000™is a weight and volume measurement system offering single/dual-channel
support. Its real-time measurement indication allows for precise monitoring during the process of
filling or emptying a chemical substance container.
1.1 Scope
This document describes the specifications, installation, capabilities, and basic operation of the Control-
Panel portion of the AccuPro-5000™ Measurement System. The Control-Panel represents the common
component used in multiple Measurement System configurations, differing mainly in the selection of a
Scale-Base. Detailed information for the Scale-Base is available in a separate document.
1.2 Acronyms and Abbreviations
•AC Alternating Current (reference to power-supply type)
•ADC Analog to Digital Converter
•AIB Analog Input Board
•AOB Analog Output Board (either mA or V)
•AWG American Wire Gauge
•DAC Digital to Analog Converter
•DC Direct Current (reference to power-supply type)
•DCS Distributed Control System
•EEPROM Electrically Erasable Programmable Read Only Memory
•HMI Human-Machine Interface (Controls, Indicators, and Display Menus)
•ICE In-Circuit Emulator (A device programmer/debugging tool)
•LCD Liquid Crystal Display
•LED Light-Emitting Diode
•MPB Main Processor Board
•N/A Not Applicable
•NC Normally Closed (contacts)
•NO Normally Open (contacts)
•PCBPrinted Circuit Board
•PLC Programmable Logic Controller
•POR Power-On Reset
•ROB Relay Output Board
•RTC Real Time Clock (MCP795W10 device on MPB)
•RU SURE Short for “Are You Sure?” prompt
•SCADA Supervisory Control And Data Acquisition
•SPDT Single-Pole, Double-Throw (Effective relay switch configuration)
•SRAM Static Random-Access Memory

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
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1.3 Definitions
•Assert: A term that describes the activation, triggering, or turning-ON of a device, indicator, or
machine state.
•Channel: A term synonymous with “Scale” in this context, a configuration of circuit boards
consisting of an Analog Input Board (required) and optional Analog Output Board and/or Relay
Output Board. Together, the boards enable the real-time weight and/or volume measurement of
material placed on a Scale-Base, then produce proportional output signals of the measurement by
way of an analog current (4-20 mA) or voltage (0-10 V) output signal. High-voltage relay switch
openings and closures can also be activated at predefined measurement setpoints for interfacing to
a user’s external circuitry.
•Control-Panel: The component of an AccuPro-5000™ Measurement System that houses the
electronics that support the Human-Machine Interface (HMI.) All wiring connections for scales,
sensors, alarms, and SCADA will terminate in the Control-Panel.
•ENTER: The act of selecting a given menu option or numeric entry as presented on the display by
way of pressing either the Enter Key or the Rotary Knob switch.
•Jumper-Shunt: A 2-position shorting pin placed on a jumper-field used to configure hardware.
•Keypad: An optional Control-Panel overlay having embedded dome-style, push-button membrane
switches used to navigate and operate the AccuPro-5000™ menus.
•Main Menu: A collection of high-level, user-control categories from which a user can access one
or more submenu control options for system calibration, configuration, and data entry.
•Measurement System: A term that describes a complete AccuPro-5000™Measurement System
consisting of the Control-Panel and Scale-Base components.
•Negate: A term that describes the de-activation, or turning-OFF, of a device, indicator, or machine
state.
•Rotary Knob: An optional rotary control device that generates a sequence of directionally-coded
pulses at a rate that is proportional to its rotational speed. The generated pulses are interpreted as
assertions of either the Down (CCW) or Up (CW) Arrow keys. In addition, pressing the knob causes
a switch-closure that is used to “Enter” a menu selection or numerical value.
•Scale-Base: The component of an AccuPro-5000™ system that houses the load-cell sensor(s) and
platform onto which the material being measured is placed.
•Setpoint: A user-defined scale measurement value, or threshold, that corresponds to a predefined
condition or event, such as the 4 mA and 20 mA output points of the Analog Output Board. A
setpoint may also be used to indicate an Alert/Alarm condition via assertion of the Relay Output
Board as a means to inform a user or SCADA system that some event has occurred or some action
is needed.
•Submenu: A low-level, HMI environment that is part of a main menu category within which system
calibration, configuration, or data entry actions are performed.
•Tare: A measurement allowance intended to offset the physical means of containing or packaging
a chemical substance so as to determine the net weight of goods.

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
All Rights Reserved
Page 8of 63
2System Specification Summary
System
Main Power
120/240 VAC +/- 10%, 50/60-Hz
Wattage: 74.7 W (maximum) @ 83% Efficiency
Fuse: 1.0A @ 120 VAC / 0.5A @ 240 VAC (5x20 mm, type slow-blow)
Connector: Sealed
DC Regulated
Power
Triple-Output: 5 VDC @ 4 A / +12 VDC @ 3 A / -12 VDC @ 0.5 A
Operational
Temperature
0oC to 60oC (32oF to 140oF)
Operational
Altitude
2000 meters (maximum)
Operational
Relative
Humidity
20% to 90% non-condensing
Enclosure
(Control-Panel)
Nominal Size: 8 x 8 x 4 Inches (LxWxD) with hinged cover
Weight: 6 lbs. (approx. maximum)
Material: Opaque Polycarbonate, UL Listed Type 4X NEMA
Location Recommendation: The Control-Panel should be operated in a
location that protects it from being soaked with liquids or exposed to
extreme weather conditions. If the system is to be located outdoors, you
must make sure not to exceed the operational temperature range. It is
further recommended that a covering be used to protect the indicator from
the elements. Locations inside buildings should be at a height that protects
it from chemical splashes and wash-down areas, but still allow for easy
operation of the Control-Panel.
Channels
Supports single or dual-channel configurations. Each channel is
independently controlled and operated.

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
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Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
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Measurement
Range: Up to (6) Digits. (5) Integer / (1) Fraction (user-selectable)
Working Capacity: Determined, in part, by factory limits and Scale-Base
specifications. Reference Scale-Base documentation.
Units: User-selectable units of Pound, Kilogram, Gallon, or Liter. Units of
volume require user-entry of chemical substance’s density or specific
gravity value.
Averaging: User-selectable smoothing filter of 10, 20, 50, or 100
samples/average.
Bar-graph: User-selectable graphical display showing relative tare, net
measurement, and system capacity components. With bar-graph enabled,
measurement display may be limited to a single channel.
Performance: Overall system accuracy is 0.1% to 0.25% Full Scale.
Liquid Crystal
Display
Size: 16-Characters x 2-Row, supports simultaneous measurement display
of (2) channels.
Backlighting: 16 user-adjustable LED brightness levels (via menu)
Contrast: User-adjustable (via potentiometer on LCD Board)
Indicators
(2) bi-color LED status indicators, (1) for each channel. Each indicator
yields up to four prioritized states as described herein.
Alarms
Internal: Audible buzzer, 3.4 kHz, 78 dB (max)
External: Support for a user-supplied, external alarm/indicator by way of a
switching relay offering a SPDT contact configuration (NO-COM-NC).
Switching capacity of 3A @ 250 VAC or 30 VDC resistive. Inductive loads
not recommended.
Controls
Options:
•(3) key membrane panel: Down-Arrow, Enter, Up-Arrow
oPress-&-Hold Arrow keys for (2) seconds to initiate a fine auto-
repeat function; hold an additional (8) seconds to initiate a coarse
repeat function.
•Optical rotary encoder knob with context-sensitive speed response
oCCW rotation substitutes for a Down-Arrow key-press
oCW rotation substitutes for an Up-Arrow key-press
oPush-button switch substitutes for an Enter key-press

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
All Rights Reserved
Page 10 of 63
Analog Input Board
Load Cells
Supports up to (4) 350-Ohm load cells producing a net 87.5 Ohm load.
Excitation
Voltage
+7.5 V @ 150 mA (max)
Sensors
Leak Detect: Active-Low, logic-level input (includes 5V supply)
Analog Output Board - mA
Loop Power
Options: (Selected via on-board jumper)
•Internal supply: 24 VDC, 1500 VDC isolation
•External supply: Range 12-30 VDC
Loop Current
Range: 3.5 mA to 20.5 mA (28 mA maximum for 2 minutes)
Resolution: < 0.001 mA
Configuration
Options
Programmable Setpoints: User-defined, net-measurement thresholds that
define the loop’s 4 mA and 20 mA output positions. The output current
follows a linear interpolation for all measurements that lie between the two
Setpoints.
Analog Output Board - V
Voltage Output
Range: (Selected via on-board jumper)
•0 VDC to 5 VDC, 1500 VDC isolation
•0 VDC to 10 VDC, 1500 VDC isolation
Resolution: < 0.0001 mV (0-5 V Range), < 0.0002 mV (0-10 V Range)
Load Resistance
2000 Ohm (nominal)
Configuration
Options
Programmable Setpoints: User-defined, net-measurement thresholds that
define the output’s lower and upper voltage limits. The output voltage
follows a linear interpolation for all measurements that lie between the two
Setpoints.

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
All Rights Reserved
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Relay Output Board
Relay Count
Dual-Configuration: (2)
Quad-Configuration: (4)
Contact
Configuration
Configuration: Single-Pole, Double-Throw
Contacts: Normally-Open (NO), Common, Normally-Closed (NC)
Switching
Capacity
3A @ 250 VAC or 30 VDC Resistive / 1 A Pilot Duty
NOTE: Inductive loads are not recommended.
Configuration
Options
Enable/Disable: If enabled, the selected relay’s switching state will respond
to defined parameters. If disabled, the relay will remain in the negated (de-
energized) state.
Units: Selectable Setpoint units of Pound (lb), Kilogram (kg), Gallon (gal),
or Liter (L).
Programmable Setpoints: User-defined, net-measurement thresholds that
will trigger relay switching.
Low or High: Defines whether relay assertion will occur in the net-
measurement region below (Low) or above (High) the programmable
Setpoint value.
Free-Run or Latch: Defines whether assertion of the selected relay will
continuously track the current net-measurement (Free-Run), or if an
assertion state will remain latched once asserted, regardless of current net-
measurement, until the user resets its state (Latch).
Trigger Alarm: Defines whether assertion of the selected relay will assert
the system alarm state.
3Assembly and Set-Up Instructions
Carefully read this entire section and the section titled System Hardware to familiarize yourself with
all of the system components before making permanent changes to the Control-Panel enclosure.
Attention should be given to known requirements as well as the future possibility of upgrading a single-
channel configuration into a dual-channel measurement system if applicable.

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
All Rights Reserved
Page 12 of 63
3.1 Factory Configuration
Before you begin, please notice the configuration sheet that is supplied with this manual. The sheet lists
the factory-programmed parameters for the AccuPro-5000™based on ordering information. If there
is a need to change any parameters, please reference this manual for options and instructions on how
to proceed. Both system and channel-level configuration menus must be properly set for correct
operation. Any changes in the measurement units, number of decimal places, value averaging,
setpoints, and calibration will affect the measurement performance and system output! Please record
any configuration changes made before contacting customer assistance for technical help.
3.2 Control-Panel Preparation and Mounting
The Control-Panel is shipped with a factory-installed power cord which utilizes a liquid-tight fitting. Do
not modify nor restrict the ability to disconnect the power cord from an outlet. All other user
connections to the Control-Panel must be made in the field per specific needs.
With power to the Control-Panel OFF, access its interior by following the procedure described in section
titled Servicing the Control-Panel. Take time to identify the optimal location for all additional fittings
or conduit. Be careful when drilling holes to avoid any damage to internal components or cabling. All
drilled holes MUST be sealed to prevent both liquids and gasses from penetrating the enclosure and
damaging the electronics. Avoid using fittings that do not provide a tight seal. It is recommended that
all fittings be liquid-tight and 4X NEMA rated. If there is a gap or opening in the enclosure’s wall that
isn’t sealed by the connector design, use a silicon caulk to seal the opening and eliminate exposure.
The Control-Panel is intended to be mounted to a wall using the four holes in the corner flanges of the
enclosure. It should be mounted at operational level and away from the floor. Though the enclosure is
4X NEMA rated, it is not designed to withstand wash-down procedures nor chemical contact beyond
accidental exposure. Avoid direct contact with chemicals or regular soaking of water as it may cause
substantial damage to the electronics. Any damage resulting from non-adherence to these requirements
will not be considered for warranty repair.
It is imperative that you read the instructions in this manual. The Control-Panel
is fully tested and programmed to the corresponding Scale-Base at the factory.
If you experience a problem with this equipment, please disconnect all
accessories to this equipment to isolate the problem. Scaletron has taken great
care to be sure the equipment is fully functional within factory specifications
before it leaves our facility. It is best to familiarize yourself with this manual
for set-up and operation procedures before you begin using this equipment. All
safety precautions need to be observed for its safe operation. Failure to
operate this equipment as instructed can result in damage to the equipment,
and can possibly cause injury. Damage caused to equipment due to improper
operation will not be considered for warranty coverage.
IMPORTANT:

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
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Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
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3.3 External Connections
Before attaching external wires to the Control-Panel connectors, it is recommended that the Control-
Panel first be connected to a power source to confirm normal operation. If it is functioning properly,
the display should briefly indicate “Scaletron Industries”followed by data for either one or two
active channels, depending on system configuration, having random (floating input) measurement
values in the selected units.
Reference section titled Maintenance for the proper procedure for removing a PCB and making external
wire connections. With reference to the Backplane Board’s layout as depicted in Figure 2, identify the
slot locations for the two supported channels and carefully remove the Analog Input Board (AIB) for
the desired channel. All Scale-Base signals, with the exception of any cable shield wire, will connect to
this board. Refer to the instruction manual of your Scale-Base to determine the correct connection to
the Load-Cell and Leak-Detect Sensor Interface terminal blocks. When all wires are connected, re-
insert the PCB following the procedure previously referenced. Connect all cable shield wires to the
threaded-hole locations provided on the top of the power-supply bracket.
If applicable, carefully remove the Analog Output Board (AOB-mA) for the desired channel. Connect
appropriate wires to the Current Loop Interface terminal block. Next, position the board’s slider-switch
to select the correct configuration for the loop’s power source. Observe all warnings as outlined in
section titled Analog Output Board (4-20 mA Output). When finished, carefully re-insert the PCB
following the procedure previously referenced.
If applicable, carefully remove the Analog Output Board (AOB-V) for the desired channel. Connect
appropriate wires to the Voltage Out Interface terminal block. Next, configure the board’s voltage
output range by either installing or removing jumper-shunts. Observe all warnings as outlined in
section titled Analog Output Board (0-5V/10V Output). When finished, carefully re-insert the PCB
following the procedure previously referenced.
If applicable, carefully remove the Relay Output Board (ROB) for the desired channel. Connect wires
to the appropriate Relay Interface terminal block as outlined in section titled Relay Output Board (Dual
or Quad Relays). When finished, re-insert the PCB following the procedure previously referenced.
The AccuPro-5000™ supports the attachment of a user-supplied, external indicator or audible alarm
that would be triggered whenever the system detects an alarm condition as defined in section titled
Channel Status LED Array. This feature allows for the notification of events that require attention from
a remote location away from the Control-Panel. Carefully remove the Main Processor Board and
connect external wires to the External Alarm Interface terminal block as outlined in section titled Main
Processor Board. When finished, re-insert the PCB following the procedure previously referenced.
Be sure to disconnect power to the Control-Panel
before making any wiring connections. In
addition, anti-static precautions must be followed
whenever accessing the Control-Panel’s interior
electronics else permanent damage may result.
IMPORTANT:

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
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Effective Date:
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File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
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When all external wire connections are complete, close the panel’s door, secure its latch, and re-install
the four screws (optional.)
4System Hardware
The AccuPro-5000™ hardware has been designed for modularity of function. This concept enables
each channel to be configured more efficiently through selection of optional circuit boards –all
interconnected via a common backplane. Upon power-up, the system scans the configuration of circuit
boards and presents a tailored suite of HMI control menus to the user.
System power is provided via a high-efficiency, triple-output, AC-to-DC supply that features short-
circuit protection.
4.1 Liquid Crystal Display (LCD) Board
With reference to Figure 1, the LCD Board manages the HMI controls and indicators. The on-board
AVR processor continuously scans the control panel for Keypad switch closures and/or Rotary Knob
rotation which the software first debounces for mechanical noise. These “control events” are buffered
before being communicated to the Main Processor Board via a polling algorithm. An LCD Module and
Status LED Array provide real-time, visual notification of system operation. Up to 8 channels can be
supported with an option to configure the board for a dual-channel application.
Figure 1: LCD Board (Bottom Side)
Heartbeat
LED
AVR
Processor
Main
Processor
Interface
Atmel
Programmer
Interface
Keypad
Interface
LCD Contrast
Adjust
Rotary Knob
Interfaces
Keypad
Matrix
Configuration
Jumper
NOTE: LCD Module and Status LEDs are mounted on reverse side.
Serial
Debug Port
Local
Reset

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
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Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
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Page 15 of 63
4.1.1 Features:
•AVR Processor: An Atmel microprocessor that includes internal SRAM and Flash Memory.
•Main Processor Board Interface: The LCD Board communicates with the Main Processor
Board via a full-duplex, RS-232 comm link. The LCD Board sends user-control events such as
Keypad presses and Rotary Knob movement to the Main Processor Board, while the Main Processor
Board sends messages to the LCD Board for display.
•Programmer (JTAG) Interface: The AVR processor is programmed via an Atmel ICE. Model
# ATATMEL-ICE, A09-2140/08.
•Keypad Interface: A custom 9-pin connection to the membrane switch overlay consisting of 4
row and 5 column traces for supporting up to 20 push-buttons.
•Keypad Matrix Configuration Jumper: A 3-pin jumper field that the AVR processor reads to
determine the configuration of the membrane switch overlay. With no jumper-shunt installed, the
configuration defaults to a 1-row x 3-column switch matrix. Other configurations remain undefined
at the time of this printing.
•Serial Debug Port: This port is for factory use only.
•Rotary Knob Interface(s): Supports an optional rotary control used for menu navigation and
data entry.
•Local Reset: Pressing this button resets the AVR Processor.
•LCD Module: An alpha-numeric, 2-row by 16-character, monochrome Liquid Crystal Display
(LCD). Limited graphic capability is also supported.
•Status LED Array: A bi-color LED (producing 4 states); one LED for each supported channel.
•LCD Contrast Adjust: A single-turn, analog potentiometer for adjusting contrast of the LCD
Module.
•Heartbeat LED: An interior LED whose state is toggled via software at approximately 0.5Hz as a
high-level indicator that the microprocessor code is executing normally. If this LED ever stops
blinking, a power-cycle may be required to recover.
4.2 Backplane Board
With reference to Figure 2, the Backplane Board provides a platform into which other circuit boards are
inserted for distribution of power and interconnection of shared signals. Inserted boards include a Main
Processor Board and support for up to two measurement channels. Each channel consists of an Analog
Input Board (required), an Analog Output Board (optional), and a Relay Output Board (optional).
Designated connectors are assigned for each board type which utilize locking card-guides to ensure a
secure fit.

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
All Rights Reserved
Page 16 of 63
Figure 2: Backplane Board
DC Power
Supply
Interface
Audible
Buzzer
Channel #2 Slots
Channel #1 Slots
DC-to-DC
Converter
Processor Slot
Locking
Card-Guide

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
All Rights Reserved
Page 17 of 63
4.2.1 Features:
•Dual Channel Support: The Backplane includes labeled card slots for the Main Processor Board
and two complete channels consisting of an Analog Input Board and optional Analog Output Board
and/or Relay Output Board. Unique PCB dimensions and connector placement prevent accidental
insertion into a wrong card slot.
•Locking Card-Guides: Card-guides serve to maintain circuit-board alignment during insertion.
Once fully inserted, the circuit boards are secured by sliding a locking mechanism (red/silver pin)
located on each card-guide into the notched areas of each board. Reference section titled
Removing/Installing a Printed Circuit Board for detailed instructions.
•DC Power-Supply Interface: Receives DC power from a triple-output power-supply module.
These voltages may be further regulated prior to being distributed through the backplane to other
boards.
•DC-to-DC Converter: +5 VDC to +3 VDC regulator for low-voltage logic supply.
•Audible Buzzer: A piezo device used to signal keypress events and/or alarm conditions. Jumper
fields are available to disable the buzzer function or to select maximum volume.
4.3 Main Processor Board
With reference to Figure 3, the Main Process Board utilizes a SAM processor that executes the primary
system code. It is responsible for interpreting user-control activity and updating all menus and
messages to the LCD Board.
The board includes a terminal-block connector for attaching an external alarm (optional). Reference
Table 1 for a description of available relay contacts for external wiring.
CONTACT LABEL
DESCRIPTION
NO
Normally-Open contact
COM
Common contact
NC
Normally-Closed contact
Table 1: External Alarm Interface
The system’s mode of operation is defined by a combination of two on-board controls –a 2-position
slider-switch and a 3-position jumper field in accordance with Table 2. The label values shown refer to
actual text on the PCB beneath their respective controls. It’s important to note that the labels represent
the text that remains visible (unhidden) by either the slider or installed jumper after a selection is
made. Reference section titled System Modes for further details of system mode differences.
SELECTED MODE
VISIBLE SLIDER-SWITCH LABEL
VISIBLE JUMPER LABEL
RUN
“RUN”
N/A
RUN
“SETUP”
“USER” and “FACTORY”
USER SETUP
“SETUP”
“USER”
FACTORY SETUP
“SETUP”
“FACTORY”
Table 2: System Mode Controls

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
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Figure 3: Main Processor Board
4.3.1 Features:
•External Alarm Interface: A 3-pin relay port that includes a normally-open (NO), common
(COM), and normally-closed (NC) contact allows for the use of an external AC/DC indicator for
USER
FACTORY
External
Alarm
Interface
RS-232
Serial
Interface
Programmer
Interface
System
Mode
Controls
LCD
Board
Interface
Real-Time
Clock
/Flash
Memory
Serial
SRAM
SAM
Processor
Battery Backup
System
Reset

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
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Page 19 of 63
Alarm notification. An associated LED indicates whether the state of the relay is energized (ON) or
de-energized (OFF).
•RS-232 Serial Interface: A half-duplex serial interface for diagnostics and exporting of logged
data.
•Programmer Interface: The SAM processor is programmed via an Atmel ICE. Model #
ATATMEL-ICE, A09-2140/08.
•System Reset: Pressing this button asserts a system reset that reboots the microprocessor
resulting in a systematic initialization of all peripheral hardware.
•System Mode Controls: A 2-position slider-switch and 3-pin jumper field define the mode of
system operation.
•LCD Board Interface: The Main Processor Board communicates both control activity and display
messages with the LCD Board via a full-duplex, RS-232 comm link.
•Real-Time Clock: A battery-backed time source that allows time-stamping of events. The device
includes Flash Memory for storage of system configuration data.
•SAM Processor: Atmel #ATSAMD21J18A-AU containing internal EEPROM and SRAM.
•SRAM: Battery-backed static memory.
4.4 Analog Input Board
With reference to Figure 4, an AIB defines the existence of an active scale, or channel. The board
includes two terminal block connectors for attaching load-cell and leak-detect sensor (optional) wires.
The load-cell interface includes the signals shown in Table 3, which follow the industry standard for
color-code of wires. Note that the interface does not include a connection for an optional cable shield
wire, which should instead be attached to an earth-ground connection available on the power-supply
bracket.
CONTACT LABEL
DESCRIPTION
RED
Positive terminal of +7.5 VDC Excitation voltage
GRN
Positive terminal of load-cell signal
WHT
Negative terminal of load-cell signal
BLK
Negative terminal of Excitation voltage
Table 3: Load-Cell Interface
The Scale-Base may be configured with a factory-installed leak-detect sensor for detection of liquid
chemical spills. The available signals of the Leak-Detect Sensor Interface are shown in Table 4.
CONTACT LABEL
DESCRIPTION
GND
Digital Ground
/LD
Active-Low, Leak-Detect signal
+5V
+5 VDC supply voltage for external sensor
Table 4: Leak-Detect Sensor Interface

AccuPro-5000™MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
All Rights Reserved
Page 20 of 63
Figure 4: Analog Input Board
4.4.1 Features:
•Leak Detection Interface: A 3-pin port that supplies a +5 VDC power source to an optional,
external fluid sensor located on a scale base. An LED indicator reflects the real-time status of the
fluid sensor; however, any assertion of the leak detection circuit will be latched as an Alarm
condition which requires a user response in order to reset.
•Load-Cell Interface: A 4-pin port that supplies an excitation voltage to one or more load-cell
bridges and receives back their summed output signal.
•Flash Memory: Non-volatile memory space used to store channel-specific calibration and
configuration data for both the AIB and ROB.
•Bridge Transducer: A 24-bit Sigma Delta Analog-to-Digital Converter (ADC) that filters,
amplifies, and converts a low-voltage, analog load-cell signal into a digital value.
•Excitation Voltage Regulator: Configured for +7.5 VDC @ 184 mA (maximum.) Offers ultra-
low noise performance with a “power good” status output signal.
4.5 Analog Output Board (4-20 mA Output)
With reference to Figure 6, the AOB-mA is an optional board that supports an industry standard, 4 to
20 mA current loop output. Its instantaneous current output is linearly proportional to the
measurement value’s relative position between two user-defined limit values. External wire
connections are made to the 2-position terminal block according to Table 5.
Leak
Detection
Sensor
Interface
Load Cell
Interface
Flash
Memory
Bridge
Transducer
Excitation
Voltage
Regulator