Adam Equipment MDW User manual

Adam Equipment Company Ltd 2012
Adam Equipment
MDW MCW
Service Manual
Part No- 700660171 – rev C1 January 2012

Adam Equipment Company Ltd 2012

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Adam Equipment Company Ltd 2012
CONTENTS
1.0 PRODUCT DESCRIPTION..................................................2
2.0 SPECIFICATION TABLE .....................................................3
3.0 TROUBLE SHOOTING GUIDE............................................4
4.0 ERROR MESSAGES FOR MDW MCW..............................4
5.0 LOAD CELL REMOVAL AND REPLACEMENT...................6
6.0 LOAD CELL WIRE TO INDICATOR CONNECTIONS..........8
7.0 CALIBRATION FOR L MODELS........................................11
8.0 PARAMETERS ..................................................................13
9.0 WARRANTY INFORMATION.............................................20

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Adam Equipment Company Ltd 2012
The MDW series of health and fitness scales are available in 3 different
models.
The MDW 160M offering height and weight measurements up to 2.1 metres
and 160kg, this is a mechanical scale using a lever work system in the base
and a balancing beam type indication.
The MDW 250L offering height and weight measurement up to 2.1 metres and
250kg x 0.1kg.
The MDW 300L offering height and weight measurement up to 2.1 metres and
300kg x 0.05kg, as well as calculating your BMI following height entry into the
Indicator.
The MCW 300L is the wheelchair version and has the same functions and
specifications as the MDW 300L.
A single load cell is used for all 3 L models mounted to the weighing platform
and connected to a digital Indicator through a pillar via a cable
The digital Indicator used for both capacity models is very similar, the main
difference being that the 300kg capacity models use a different software
version and have rs 232 as standard.
All L type models have as standard a lead acid rechargeable battery fitted
internally to the Indicator.
1.0 PRODUCT DESCRIPTION

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Adam Equipment Company Ltd 2012
MODEL CAPACITY AND
DIVISION BASE SIZE mm
MDW 160M 160kg x 0.1kg 275 x 375
MDW 250L 250kg x 0.1kg 275 x 375
MDW 300L 300kg x 0.05kg 275 x 375
MCW 300L 300kg x 0.05kg 450 x 450
2.0 SPECIFICATION TABLE

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Adam Equipment Company Ltd 2012
PROBLEM POSSIBLE CAUSES
Poor weighing
Performance
Check for interference with the weighing platform
Check that the load cell is fully tightened or the lever
works are connected correctly
Check that the adjustable weights on the beam are in
the correct position
Check that the load cell cable is securely connected
and not damaged
Check that the overload stop is not incorrectly
adjusted or loose
Check that the product has good stability
Incorrect height
measuring Height measuring device is loose
Height measuring device being operated incorrectly
4.0 ERROR MESSAGES FOR MDW MCW
ERROR
MESSAGE DESCRIPTION POSSIBLE CAUSES
_ _ _ _ _
0 Zero point exceeds range Load cell damage, main PCB fault, Weight left on weighing platform
0_ _ _ _ _ _ Zero point is under range Load cell damage, main PCB fault,
Load cell connection problem
_ _ _ _ _
Ad A/d exceeds the maximum range Improper calibration of the indicator, Load cell damage, main PCB fault
Ad_ _ _ _ _ A/d is below the minimum
range Improper calibration of the indicator, Load cell damage, main PCB fault
EEP.Er EEPROM error Processor failure
CAL.Er Error when in calibration mode Incorrect operation of calibration,
Incorrect weight applied for calibration,
Weight unstable in calibration mode
Lo.bat Internal battery voltage too low Battery requires recharging or is faulty,
Power adaptor is faulty, main PCB fault
FULL The weight on the platform
exceeds the capacity of the
scale
Person is too heavy,
Error in calibration
3.0 TROUBLE SHOOTING GUIDE

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Adam Equipment Company Ltd 2012
To evaluate that the load cell signal output is correct you can make certain
measurements. The load cell functions using a 5Vdc input and this can be
checked by placing two individual probes from a multi meter between the
(exc +) and (exc-) cables where the load cell cable attaches to the Main PCB
or load cell connector.
If 5Vdc is present then power is being provided correctly to the load cell, the
next step is to measure the output of the load cell, this can be done by placing
the 2 probes between the (sig +) and (sig -) wires. In order to obtain an
accurate reading the (sig +) and (sig -) wires must be detached (de-soldered)
from the connector.
You should expect to see a positive voltage reading of between 0 and 2 milli
volts when the load cell assembly is at no load, and when a downward force is
applied to the load cell assembly the reading should increase.
If with no load a reading of more than 2 milli volts is recorded then this
suggests damage to the load cell may have occurred and a replacement load
cell is required.

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Adam Equipment Company Ltd 2012
When replacing a load cell the correct type and capacity load cell should be
selected, once fitted it will need to be calibrated and checked, there is an
overload stop that should be adjusted to protect the load cell.
The overload stop should be adjusted to allow the minimum downward
movement of the load cell once full load is on the weighing platform, set the
overload stop by placing full load evenly onto the platform then adjust the stop
screw before locking it into position using the nut provided.
To replace a load cell on an MCW firstly unscrew the 4 x fixing screws that
secure the foot rest to the chair assembly and remove, then unscrew the 4 x
fixing screws that secure the chair assembly to the main frame.
This then exposes the weighing platform for both the MCW L and MDW L.
Unscrew the 4 x load cell fixing bolts that secure the load cell to the weighing
platform and remove.
Turn the platform over and unscrew the 4 x load cell fixing bolts that secure
the load cell to the main base.
The load cell can then be removed and disconnected from the cable
connector.
Fit the new load cell to the main base ensuring that the arrow for direction of
movement points downwards and the 4 x fixing bolts are tightened well, then
solder the wires to the Indicator connector.
Refit the weighing platform and tighten the 4 x fixing bolts, check that the
overload stop is correctly set before testing.
Follow the steps below to remove and replace a load cell.
5.0 LOAD CELL REMOVAL AND REPLACEMENT

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MCW
MCW and MDW L

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Adam Equipment Company Ltd 2012
Calibration of the new load cell will be required and a check for Repeatability,
Off centre loading and Linearity should be made.
Main PCB faults are very rare, if you have a problem where power to the PCB
is correct and the load cell has been checked and confirmed as fully functional
then replacement of the Main PCB is the most effective method of repair.
If this is the case, the PCB number and model of machine should be made
clear so that the PCB can be programmed and checked first, once checked
the PCB can then sent to be fitted directly to the Indicator.
Calibration can then be performed and the unit should function correctly
All load cell to Indicator cables are 4 core and wired via a connector following
the pin numbers as below.
Pin 1 Excitation plus+ Red
Pin 2 Excitation minus – Black
Pin 3 Signal minus – Green
Pin 4 Signal Plus + White
6.0 LOAD CELL WIRE TO INDICATOR CONNECTIONS