Smart Calibration Unit Mk4 - archive.mecmesin.com SCU Mk4... · • Smart cell capacity and type...
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Smart Calibration Unit Mk4 Operator manual 431-441-01 January 2014
Transcript of Smart Calibration Unit Mk4 - archive.mecmesin.com SCU Mk4... · • Smart cell capacity and type...
Smart Calibration Unit Mk4
Operator manual
431-441-01
January 2014
2014 © Mecmesin Ltd, supplied with Mecmesin test systems and not for redistribution
Part no. 431-441-01
SCU Mk4 Mecmesin iii
Contents
1. Overview 1
1.1 Before use 1
1.2 Maintenance and repair 1
1.3 Mounting the SCU 1
2. Powering the gauge 2
2.1 Replacing batteries 2
2.2 Mains operation 2
2.3 Fitting of alkaline batteries 3
2.4 Battery safety information 3
3. Adjustment and calibration stages 4
3.1 Powering up 4
3.2 Start-up screen 4
3.3 Inversion of loadcell signal 4
3.4 Unit of measurement 5
3.5 Loadcell type select 5
3.6 Initial zero screen (‘IO’) 7
3.7 Compression zero screen (‘CO’/’ACWO’) 7
3.8 Compression max screen (‘CM’/’ACWM’) 8
3.9 Tension Zero Screen (‘TO’/’CWO’) 8
3.10 Tension max screen (‘TM’/’CWM’) 9
4. Linearisation 10
4.1 Diagnostic screen 10
4.2 Error messages 10
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1. Overview
This instrument’s firmware only allows the adjustment and calibration of Smart cells. It does not communicate with an internal loadcell.
As with the previous SCU, this instrument allows the user to skip different stages depending on whether the Smart is calibrated or not.
• With an uncalibrated Smart, the user must enter loadcell capacity, initial offset and at least one of the compression/tension stages.
• With a calibrated Smart, provided the loadcell capacity or initial offset settings are not modified, the user can skip straight to the ‘linearisation’ stage and back again.
No data is written to the EEPROM until all the stages have been completed, so if the user skips back to an earlier stage, any calibration readings taken will be lost.
Data is automatically stored after the ‘adjustment’ stage. Once the data is committed to memory, during the ‘linearisation’ stage, the instrument can display the contents of the Smart’s EEPROM.
1.1 Before use
On receiving the unit, check that no physical damage has occurred to the packaging, plastic case or the instrument. If any damage is evident, notify Mecmesin immediately.
1.2 Maintenance and repair
When cleaning the keypad, care must be taken to avoid liquids, especially alcohols, seeping around the edge of the membrane. We therefore recommend the use of a lightly-dampened cloth to avoid liquid spillage onto the membrane.
Mecmesin test instruments contain no user-serviceable parts. If the gauge fails, or appears to behave in an unusual manner, contact your local supplier for support. Do not continue to use the gauge until it has been checked and if necessary, repaired and returned to a safe working condition. Do not attempt any repairs without consulting Mecmesin or your local supplier.
1.3 Mounting the SCU
On the rear of the gauge there are two M5 threaded holes, used for mounting the gauge. Ensure that the screws used are threaded into the gauge to a maximum depth of 12 mm. If screws are fitted beyond this depth, damage to the internal PCB may occur.
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2. Powering the gauge
The AFG is supplied with a set of five Nickel Metal Hydride AAA rechargeable batteries, which are supplied fully charged to allow use straight from the box. Do not use any other battery charger other than that supplied with the force gauge.
2.1 Replacing batteries
To replace the batteries you must first remove the battery cover on the upper part of the rear of the gauge by removing the two retaining screws. Remove the fitted batteries and fit the five new batteries in the battery holder, ensuring that you observe polarity. Place the batteries on top of the ‘release tag’ so they can be freed easily next time from the spring-loaded contacts.
Refit the battery cover and tighten the two retaining screws.
Connect the mains adaptor/charger to the AFG charger socket located at the right-hand side of the gauge next to the display, and charge the batteries for 14 to 16 hours. Only use the adaptor/charger supplied. A fully-charged battery pack will provide approximately 20 hours constant use between charges.
A low battery symbol will appear in the display approximately two minutes before the gauge powers down:
2.2 Mains operation
The SCU can also be powered directly from the mains. This can be achieved with or without the rechargeable batteries being fitted. Connect the mains adaptor/charger to your mains supply. Only use the adaptor/charger supplied. If rechargeable batteries are fitted, a trickle charge will be applied to the batteries with the display switched on.
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2.3 Fitting of alkaline batteries
The SCU can also be powered by AAA 1.5 V alkaline batteries (not supplied). For the fitting of alkaline batteries, follow fitting instructions as per rechargeable batteries above. Warning: When alkaline batteries are fitted, the mains adaptor/charger must NEVER be connected to the AFG due to the risk of acid leakage, which could damage the instrument.
2.4 Battery safety information
NEVER:
• short circuit
• disassemble or deform cells
• heat or incinerate
• immerse in water
• solder anything to the battery terminals
• reverse individual cell polarity
• use alternative chargers other than those supplied by Mecmesin
• use replacement parts other than those supplied by Mecmesin
Never dispose of batteries with ‘normal’ refuse. Contact your local Environmental Authority to determine the location of your appropriate disposal facility
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3. Adjustment and calibration stages
3.1 Powering up
Warning! The SCU must be powered down when connecting or disconnecting smart transducers.
To power up the gauge press the red key.
3.2 Start-up screen
The start-up screen displays the following:
• MECMESIN
• SCU in large letters
• Firmware version: (1.13 here was current at the time of publishing)
• Smart cell capacity and type (or XXXXN if a Smart cell is not present or uncalibrated)
3.3 Inversion of loadcell signal
For a calibrated loadcell, the sign bit will be replicated and shown on the calibration screens. A ‘+’ will indicate what is considered correct operation i.e. Compression reduces count value. A ‘–’ will indicate that the load cell has reversed operation.
For uncalibrated Smart cells, the gauge will default to correct operation and a ‘+’ will be displayed.
It may be necessary to invert the output signal of some manufacturers single direction load cells as their convention could be that the loadcell’s output signal is positive for a compressive load.
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If the operator changes the sign during calibration and subsequently cancels, reverting back to the loadcell selection, the sign will revert back to the original settings.
The sign bit can only be changed during the initial offset (IO) stage by pressing the Zero/Down button.
3.4 Unit of measurement
During the loadcell selection stage, the loadcell capacity is specified in newtons (N) for force and newton-metres (N.m) for torque. During the initial offset stage, the calibration unit of measurement can be changed by pressing the Units/Menu button but becomes fixed for subsequent stages (the user can skip back to change them).
3.5 Loadcell type select
Display
Line 1 (Left) Force / Torque 1 / Torque 2; (Right) blank / C / T
Line 2 Loadcell capacity
Line 4 Units N for Force, / N.m for Torque
Bidirectional calibration Unidirectional compression only Unidirectional tension only
Pressing Max/Esc allows the user to cycle through adjustment for: both spans, compression only, tension only.
Buttons
Max/Esc Allows single sided adjustment C or T
Units/Menu Switches between Torque/Force cell
Txd/Up Increase load cell capacity
Zero/Down Reduce load cell capacity
Reset/Enter Select the load cell capacity and move onto next step
Pressing the Max/Esc button allows the user to adjust a compression or tension only load cell. The span that is not selected is automatically set to the adjusted span. By default both spans must be calibrated. Pressing Max/Esc allows the user to cycle through adjustment for: both spans, compression only, tension only.
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Initial settings
Uncalibrated loadcell Force, 100 N, Torque, 6 N.m
Calibrated loadcell Type and capacity of loadcell
Selectable Force/Torque capacities:
Force (N) Torque (N.m) Table 1
Torque (N.m) Table 2
1 0.01 0.01
2 0.015 0.02
2.5 0.03 0.025
5 0.06 0.05
10 0.1 0.1
20 0.15 0.2
25 0.3 0.25
50 0.6 0.5
100 1 1
200 1.5 2
250 3 2.5
500 6 5
1000 10 10
2000 15 20
2500 30 25
5000 60 50
10000 100 100
20000 150 200
25000 300 250
50000 600 500
100000 1000 1000
200000 1500 2000
250000 3000 2500
500000 6000 5000
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Additional
If the loadcell is calibrated, the screen will always default to the calibrated type (for example, when pressing escape on the initial offset screen). If the loadcell is not calibrated then it is initially set to the default value (100 N Force or 6 N.m Torque). Subsequently returning to the screen should display the default capacity for the cell type.
3.6 Initial zero screen (‘IO’)
Display
Header ‘+’ for correctly wired load cells, ‘-‘ for load cells that required inverting.
Middle line Load cell counts
Footer (middle) ‘IO’ indicates initial zero
Footer (right) Units Force: ‘N’ / ‘kgf’ / ‘lbf’ Torque: ‘N.m’ / ’kgf.cm’ / ‘lbf.in’
Buttons
Max/Esc Back to loadcell select screen
Units/Menu Selects units (see above)
Txd/Up If the Smart is calibrated it will advance to compression zero screen
Zero/Down Inverts load cell count value. Toggles ‘+’/’-‘ symbol
Reset/Enter Enters count value and moves to next screen
The ‘+’/’-‘ symbol can only be changed during this, the initial offset (IO) stage.
3.7 Compression zero screen (‘CO’/’ACWO’)
Display
Header ‘+’ for correctly wired loadcells, ‘-‘for load cells that required inverting.
Middle line Load cell counts
Footer (middle) ‘CO’/’ACWO’ indicates Compression zero or Anti-Clockwise zero
Footer (right) Units Force: ‘N’ / ‘kgf’ / ‘lbf’ Torque: ‘N.m’ / ’kgf.cm’ / ‘lbf.in’
Buttons
Max/Esc Back to previous stage
Units/Menu N/A
Txd/Up Skip stage (if possible)
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Zero/Down N/A
Reset/Enter Enters count value and moves to next stage
3.8 Compression max screen (‘CM’/’ACWM’)
Display
Header ‘+’ for correctly wired loadcells, ‘-‘for load cells that required inverting.
Middle line Load cell counts
Footer (middle) ‘CM’/’ACWM’ indicates Compression Max or Anti-Clockwise Max
Footer (right) Units Force: ‘N’ / ‘kgf’ / ‘lbf’ Torque: ‘N.m’ / ’kgf.cm’ / ‘lbf.in’
Buttons
Max/Esc Back to previous stage
Units/Menu N/A
Txd/Up Skip stage (if possible)
Zero/Down N/A
Reset/Enter Enters count value and moves to next stage
3.9 Tension Zero Screen (‘TO’/’CWO’)
Display
Header ‘+’ for correctly wired loadcells, ‘-‘for load cells that required inverting.
Middle line Load cell counts
Footer (middle) ‘TO’/’CWO’ indicates Tension zero or Clockwise zero
Footer (right) Units Force: ‘N’ / ‘kgf’ / ‘lbf’ Torque: ‘N.m’ / ’kgf.cm’ / ‘lbf.in’
Buttons
Max/Esc Back to previous stage
Units/Menu N/A
Txd/Up Skip stage (if possible)
Zero/Down N/A
Reset/Enter Enters count value and moves to next stage
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3.10 Tension max screen (‘TM’/’CWM’)
Display
Header ‘+’ for correctly wired loadcells, ‘-‘for load cells that required inverting.
Middle line Load cell counts
Footer (middle) ‘TM’/’CWM’ indicates Tension Max or Clockwise Max
Footer (right) Units Force: ‘N’ / ‘kgf’ / ‘lbf’ Torque: ‘N.m’ / ’kgf.cm’ / ‘lbf.in’
Buttons
Max/Esc Back to previous stage
Units/Menu N/A
Txd/Up Skip stage (if possible)
Zero/Down N/A
Reset/Enter Enters count value and moves to next stage
The calibration data is automatically stored after the ‘adjustment’ stage.
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4. Linearisation
Middle line Load reading
Lower left Tension/compression or torque direction symbols
Lower right Units
Bottom Load bar
Max/Esc Back to previous stage
Units/Menu Change units
Txd/Up N/A
Zero/Down tare/zero
Reset/Enter Diagnostic screen
4.1 Diagnostic screen
During the ‘linearisation’ stage the instrument can display the contents of the Smart cell’s EEPROM by pressing the Reset/Enter button.
The EEPROM readings screen (detailed above) can also be accessed by holding down Max/Esc during start-up. Turn the gauge off to clear the screen.
4.2 Error messages
Error: No Smart
• Smart instrument not connected.
• Smart PCB has not been programmed.
• Smart PCB cannot be read.
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Insufficient counts
The SCU requires the load cells output to move by 2500 counts between the zero and maximum load stages.
• Incorrect load applied for the loads cell capacity.
• Load cell output not 2mV/V +-0.2mV/V as required.
• Faulty Smart PCB.
Tensile load not applied
• A load in tension has not been applied at ‘TM’ stage.
• Load cell signal wired incorrectly to Smart PCB.
• Incorrect use of load cell inversion at ‘IO’ stage.
Compressive load not applied
• A load in compression has not been applied at ‘CM’ stage.
• Load cell signal wired incorrectly to Smart PCB.
• Incorrect use of load cell inversion at ‘IO’ stage.
CW torque not applied
• A load in the clockwise direction has not been applied at ‘CWM’ stage.
• Load cell signal wired incorrectly to Smart PCB.
• Incorrect use of load cell inversion at ‘IO’ stage.
ACW torque not applied
• A load in the anti-clockwise direction has not been applied at ‘ACWM’ stage.
• Load cell signal wired incorrectly to Smart PCB.
• Incorrect use of load cell inversion at ‘IO’ stage.
General Operation.
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