INSTRUCTION MANUAL

FEEDER with SCM and

external converter on load cell

SCM.940.001-E.a
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Service
If you need assistance, please call your local service center :

Or
Hasler International SA Tel. +33 (0)4 74 16 11 50
F- 38780 Pont-Evêque Fax +33 (0)4 74 16 11 55

Hasler Suisse Sàrl Tel. +41 (0)32 720 02 300

CH-2000 Neuchâtel Fax +41 (0)32 720 02 390

Hasler Deutschland GmbH Tel. +49 (0)54 81 80 50

D-49525 Lengerich Fax +49 (0)54 81 50 51 10

Before you call …

➜ Do you have alarm displays?
Are you able to eliminate the cause of the alarm displays?

➜ Have you modified part of the system, feeder, product or operating mode?

➜ Have you tried to remedy the fault in accordance with the operating and service
instructions?

➜ Please note
the job number ...........................................................
the type of feeder ...........................................................
the motor control type ...........................................................

“No part of this publication may be reproduced or transmitted in any form or by any means electronic or mechanical
including photocopy, facsimile or computer generated distribution without written permission from the Hasler
Suisse. All translation rights are reserved by the Hasler Suisse . The Hasler Suisse has made every effort to ensure
the accuracy and validity of this document. However, errors and omissions may have occurred. If an error or
omission is found, please contact the Hasler Suisse at (+41 (0) 32 720 23 00.

Information in this manual is correct as of the date of publication. Hasler Suisse assumes no responsibility for
damages resulting from misuse of the equipment or negligence on the part of operating personnel.”

Copyright
Hasler Suisse Sàrl
Rue du Puits-Godet 10a
CH-2000 Neuchâtel

Prepared and edited by

Technical Documentation
Hasler Suisse Sàrl

Order no : SCM.940.001-E.a
Date: 02.10.2002

Hasler Suisse Sàrl, an Hasler International Sa Company.

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TABLE OF CONTENTS

1. Hardware information ......................................................................................... 2

2. Scale Menu Programming.................................................................................. 3
2.1 Scale Sub-Menus .................................................................................. 3
2.2 General scale sub-menus entries .......................................................... 3
2.3 SFT scale sub-menu entries.................................................................. 4
sft Scale sub-menu entries con't.................................................................. 5
2.4 ANALOG LD. CELL sub- menu entries.................................................. 5
3. CALIBRATIONS .......................................................................................... 6
3.1 Weight calibration ......................................................................... 6
3.1.1 Weight calibration of a load cell through the external
converter................................................................................. 6
3.1.2 When should a weight calibration be carried out ? ................ 7
3.1.3 Before beginning the calibration, check the following : .......... 8
3.2.1 Checking the calibration ........................................................ 9

SCM.940.001-E.a page 1/9

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1. HARDWARE INFORMATION

Intro
The Scale Menu is used to program the Scale parameters such as Scale
Range, Tare, Span for Calibration and SFTs.

Analog (or strain gauge) load cells are handled by dedicated

circuitry presenting them to the process in a similar manner as SFTs.
These is a separate converter unit for the SCMs( Part Nr. 9564 –
30588). Analog load cells are calibrated separately, and then used as
standard SFTs. If you use the analog load cell converter you must
calibrate the analog load cell. A separate sub menu “ANALOG
LD.CELL “will appear if you connect the converter unit.

NOTE: If the external converter is used in replacement of converter mounted on

the main board of the SCM, you need to place the dip-switch S1 with the selection
above before to switch on the power :

S1
JU Position
1 ON
2,3,4 OFF

NOTE: Using the external analog converter type 9564-30588 select the position
of the jumpers B1 and B2 use for a load cell with 4 (without reference) or 6 wires (with
reference) this jumpers are situated on the external converter.

B1 and B2

B1, B2 Position
Load cell 4 wires ON
Load cell 6 wires OFF

page 2/9 SCM.940.001-E.a

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2. SCALE MENU PROGRAMMING

2.1 SCALE SUB-MENUS
Three scale sub-menus exist.

Entry Definition
GENERAL Takes the user to the scale menu for calibration and
SCALE reading general weight information.
SFT SCALE Takes the user to SFT set-up information.
ANALOG LD. Takes the user to the scale menu for calibration and
CELL reading general weight information of the analog load
cell.

2.2 GENERAL SCALE SUB-MENUS ENTRIES

The table below defines the Scale Menu entries.

Entry Definition
TARE This is the gross weight of the feeder without material.
This value can be entered in engineering units from the
keypad as well as being entered automatically by doing
the Auto Tare. Record this value in case the battery fails
or SCM Controller Pc is replaced.
AUTO TARE

Press the ENTER key twice to zero the feeder. Be sure

there is not material in the hopper.
NET WT This is the net weight of material in the hopper if the
feeder system has been properly tared.
Gross - Tare = Net Weight.
This is a display only and will be in kg.
SPAN This is the feeder/scale calibration number. The new
value is entered from the keypad when calibrated. You
should expect that the number will nearly always be
1.0000.
GROSS WT This is the gross amount of weight on the scale. This is a
display only variable and will be in kg.
SCALE RANGE This is the gross range of the scale. This value can only
be entered in Kilograms and is inputted from the
keypad.

SCM.940.001-E.a page 3/9

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2.3 SFT SCALE SUB-MENU ENTRIES

Entry Definition
SFTs This variable displays the addresses of all active SFT,s
on this feeder.
Example = -123 - - - - - - - - -
If any of the following are displayed, an error is
indicated.
" ? " = Invalid response from SFT
" - " = No SFT at that address
" T " = SFT no longer responds to controller
" f " = SFT communicates but has failed internally
Entering a 1 and then Enter will force the controller to
repoll all SFT addresses and update the display.
SFT REQUIRED This variable selects the number of SFTs required for
this feeder. For LWF one (1) or three (3) SFT is normal.
If some number other than the required SFT’s is present,
the controller will switch to Vol and an alarm will
occur.
SFT SELECTED This variable selects the address of the SFT, whose
parameters will be displayed.
SFT This variable turns on <Yes> a selected SFT to that
ADDRESSED number in the SFT Selected variable or turns that same
device off <No>.
SFT WEIGHT This variable displays the raw weight of the SFT
selected.

page 4/9 SCM.940.001-E.a

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SFT SCALE SUB-MENU ENTRIES CON'T

Entry Definition
SFT TYPE This variable displays the range of the selected SFT.
Scale range is the sum of the required SFT,s.
SFT STATUS This display indicates the operating status of the SFT.
Normally shows the number 1 or 3.
where 181 = SFT operating in synchronous mode
where 183 = SFT is synchronous mode address leader
and is operating in synchronous mode.

Status numbers other that shown may indicate a faulty

SFT. Contact Hasler’s service department.
SFT S/W SFT internal software.
REPOLL SFTs By pressing the enter key twice, permits a polling of
SFTs on the Weight Data Channel. When this is done,
the SFTs will addressed to the SFT connector number on
the SCM to which they are attached.

2.4 ANALOG LD. CELL SUB- MENU ENTRIES

Entry Definition
SFT SELECTED The address of the analog load cell converter.
CAL. WGT Insert the value of the calibration weight in kg then

ENTER

CAL.LEV. RAT Calibration lever ratio = 1.00

NULL PT.

Zero point of the analog load cell press ENTER .

CALIBRATION Calibration of the analog load cell with the calibration
weight on the hook . If the calibration weight is on the

hook press 2X ENTER . After the calibration put off

the calibration weight !

SCM.940.001-E.a page 5/9

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3. CALIBRATIONS
3.1 WEIGHT CALIBRATION
Most of the Hasler's feeders are equipped with load cells completely digital (SFT); they
are already calibrated in the factory, so there is no need to calibrate once again. Only a
compensation of the load system tare is necessary.

3.1.1 Weight calibration of a load cell through the external converter

The purpose of the weight calibration is to make the numerical measurement of the load
of material correspond to a known reference value.

Weight is measured by the force which the mechanical weigh exerts against a strain
gauge load cell. The load cell converts this mechanical force into an electrical signal
which represents the magnitude of the force. The electric signal is transmitted to the
Converter and SCM by shielded cables. The converter amplifies the signal and converts
it into a numerical value (the load cell acquisition) the range of the a-d converter is 0 to
65536 pts.

In order to make the electrical signal correspond to an accurate representation of the

load of material on the load cell, the weight measurement must be calibrated.

This calibration consists of measuring the variation of the numerical measurement

"GROSS WT" for an increase of the load equal to the reference weight.

Weight measurement diagram for SCM with analogue converter :

SUPPLY LK1 5
Load Cell Analogue to digital
SUPPLY LK1 6 Power supply 5 V converter
Type : 9564-30588

SENSE LK1 1
SENSE
LK1 3

SCM
SFT L
SIGNAL LK1 2
0 – 10 mV SIGNAL
A Protocol K
LK1 4 D 4

Remark: To prevent a voltage drop in the load cell power supply wires from affecting
the weight measurement, a 6 wire connection as described below should be used : 2

page 6/9 SCM.940.001-E.a

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power supply wires (5 and 6), 2 power supply return wires (1 and 3) for measuring the
voltage actually applied to the load cell feeder and 2 measuring wires (2 and 4).

Weight measurement diagram for SCM

Relation between the converter points and the effective weight :

GROSS
WEIGHT

Delta
WEIGHT

NULL PT.

Applied
< CAL. WGT > WEIGHT

CAL. WGT
Scale Range = ------------------------ * max point converter
Delta weight

3.1.2 When should a weight calibration be carried out ?

The weight calibration has already been done in the factory during the final control of
the installation. It is not necessary to repeat it.

However, if the installation has received mechanical shock during transport (the
weighbridge), and/or after the following maintenance operations have been done such
as :

- a replacement of the load cell

- a replacement of the converter 9564-35880

- a replacement of the SCM cpu board

or if one mechanical parameter as been changed on the weight measurement chain,

this calibration must be repeated.

SCM.940.001-E.a page 7/9

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ATTENTION : before every intervention on the feeder, switch off the main switch
of the feeder's motor speed controller.

3.1.3 Before beginning the calibration, check the following :

Before the calibration, it's better to control the following points:

1. Have the transport security wedges been unlocked or removed ?

2. Is the feeder stopped ?

3. Is the belt empty ? or hopper empty ? If not, close the manual material feed gates
and empty the belt or hopper using the function "Emptying" or "Empty Fdr Now".

4. On belt weighfeeder have the weighbridge idlers been aligned. If not, align them
according to the "GRAVIT, Weighing option" instructions.

5. Is the reference weight ready near to the feeder. Be sure that this reference weight
corresponds to the weight entered into the parameter "CAL. WGT".

6. Set the Security level to maintenance and insert the key.

If all of the above conditions have been fulfilled, proceed with the weight calibration.

(1) Select the following table in the Menu SCALE

(2) Press <ENTER>, then select ANALOG LD. CELL
sub menu
(3) Press <ENTER> then start the zero function by
NULL PT.
pressing
(4) Check the value of the calibration weight with the CAL. WGT
parameter
(5) Then start the calibration by pressing CALIBRATION
If the reference weight is greater than 20 % of the nominal scale weight, the
measurement is accepted.
If the reference weight is less than 20% of the nominal
scale weight, the SCM will generate an message. WARNING
If this message appear the reference weight is too small, Delta weight < 20 %
the resolution of the measurement of the load is too low; Accept any way ?
there is a high risk of having a bad regulation and, Esc=NO enter=YES
consequently the accuracy of the installation will be
affected.

The SCM then asks

The ->TARE<- indicator of the console will go off. The calibration is ended.

page 8/9 SCM.940.001-E.a

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3.2.1 Checking the calibration

After each weight calibration or whenever you wish to check the accuracy of the weight
measurement follow the procedure described below.

In the scale menus table display this parameter:

(1) Select the following table in the Menu SCALE

(2) Press <ENTER>, then select GENERAL SCALE
sub menu
(3) Press <ENTER> then select NET WT

Read this weight which should be around zero.

Place the reference weight or another known weight on the weighing idler, this weight
should be in equilibrium in the idler, or put the weight on the hopper.
Read the indication of the net weight placed on the idler or hopper. The difference
between these two weights should be equal to the weight placed on the idler or hopper.

SCM.940.001-E.a page 9/9