Adam Equipment MDW Manuel utilisateur

Adam Equipment Company Ltd 2012

Adam Equipment

MDW MCW

Service Manual

Part No- 700660171 – rev C1 January 2012

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

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

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

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

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.

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

Adam Equipment Company Ltd 2012

MCW

MCW and MDW L

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

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