Vetek JWL-1 User manual

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0
JWL Series
Service Manual

Vetek Weighing AB www.vetek.com JWL Service Manual
May not be reproduced in any form without written permission PAGE
1
I.
Contents
Assembly drawing
1
2
1 – 1
Explosive view (JWL) 2
1 – 2
List of parts (JWL) 3
1 – 3
Block diagram of electronic structure 4
1 – 4
Wiring diagram 5
2. Troubleshooting procedure 6
2 – 1
Troubleshooting flow 6
2 – 2
Troubleshooting table 7
2 – 3
Confirmation of application environment 7
2 – 4
Simple inspection of electric circuit 8
2 – 5
Performance inspection 8
3. Maintenance and setting 9
3 –
1
Maintenance flow 9
3 –
2
Model setting 9
4. Setting of parameters 10
4 – 1
Parameter setting 10
4 – 2
Description of parameter values 11
4 – 3
Unit setting 13
5. Linear calibration 17
6. Single point calibration 19
7. Error message list 21
8. External interface 22
8 – 1
RTC function setting 22
8 – 2
Signal output pins of three-in-one board 24
8 – 3
Single option 24
8 – 4
Two options 34
8 – 5
RS232 output format 36
9. Others 38
10. Circuit diagram 41
10 – 1
CPU, peripheral and other circuits 41
10 – 2
LCD circuit 42
10 – 3 Applicable mainboard version and software version 42

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1. Assembly Drawing
1 – 1 Explosive view

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1-2 List of parts
No. Name Quantity Part No.
Material No.
1 xm JWL-
Chinese
front panel
1 JWL-1 21-1925-0100
2 xm key 1 JWL-2 21-0506-0100
3 xm level meter 1 JWL-3 02-0108-0003xm(14mm)
4 Xm transformer 1 JPL-4 61-0003-0400
5 Xm switch 1 JWL-5 60-0000-0000xm
6 Xm power socket 1 JWL-6 80-0125-0000
7 xm semi-
finished
JWL board
1 JPL-7 60-0503-0001xm
8 Xm lower cover 1 JWL-8 02-0000-6020
9 xm lower support 1 JWL-9 10-0425-0100
10
Xm screw for
transport protection
1 JPL-10
31-0404-0000xm
11 Xm rubber levelers 4 JWL-11
01-0100-0030
12 xm RS232 board 1 JCL-12
80-0900-2200xm
13-1
xm sensor -
Chung
Yuen 3k
1 JWL-13
51-0400-0400xm
13-2
xm sensor -
Chung
Yuen 5k
1 JWL-13
51-0410-0000
13-3
xm sensor-
Chung
Yuen 10k
1 JWL-13
51-0410-0010
13-4
xm sensor -
Chung
Yuen 20k
1 JWL-13
51-0410-0020
13-5
xm sensor -
Chung
Yuen 40k
1 JWL-13
51-0410-0040
14 Xm storage cell 1 JWL-14
61-0201-0098xm
15 Xm cell cover 1 JWL-15
02-0000-6030
16 Xm rear PCB 1 JPL-16
80-0126-0010
17 xm upper support 1 JWL-17
10-0425-0000
18 xm upper cover 1 JWL-18
02-0000-6010
19 xm rear panel 1 JWL-19
20-0000-6040
20
xm plastic
down-warped pan
1 JCL-20
02-0000-6040
21
xm stainless steel
down-warped pan
1 JCL-21
12-0000-1200

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1 – 3 Block diagram of electronic structure

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1 – 4 Wiring diagram(圖中中文應去除)

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2. Troubleshooting Procedure 2– 1 Troubleshooting flow
START
LED act
s
or not
LCD, backlight, buzzer,
LCD displays completely or not
Yes
Confirm application environment
LCD display status
Cannot zero or
STABLE flashes
LCD display Err5
Display weight
Check for AD
internal
COUNT value
Replace machine board
and repair
Yes
No
Adjust AD value
Transport protecti
ve
screw
is disassembled or not
Object interference exists
near scale pan or not
Remove interfering object
Yes
No
Recalibrate zero point
Remove transport protector
R
eturn to START
R
eturn to START
R
eturn to START
R
eturn to START
Yes
No
R
eturn to START
Zero point, weighing
is stable or not
Keys are normal or not
Yes
Yes
Weight display
can display to
MAX+9e or not
Yes
Weight is accurate or not
Yes
Linearity is good or not
Can weigh or not
Yes
Unbalanced load is normal or not
Residual creep exists
or not
Yes
Yes
Replace machine board, and repair
or replace LOAD-CELL
No
R
eturn to START
R
eplace
machine board,
and repair,
interference
exists or not
R
eturn to START
No
Can z
ero or not
Yes
Check AD COUNT
value for instability,
replace machine
board, and repair,
interference exists or
not
R
eturn to START
No
Check machine board or
replace KEYBOARD
R
eturn to START
No
Replace machine board and repair
R
eturn to START
No
Linear calibration
R
eturn to START
No
L
i
n
e
a
r
c
a
l
i
b
r
a
t
i
o
n
R
eturn to START
No
Correct error at the
four corners
R
eturn to START
No
Check LOAD
-
C
ELL
for failure
Return to START
Yes
Performance and function test
No
Check battery wiring
for loosening
Check power supply
switch for failure
No
Connect battery wiring
Return to START
No
Yes Check battery or
damage or power
ailure
Charge or replace battery
Yes
Can it work or be charged
with AC power supply
Charge or replace
battery
Yes
Check transformer for
damage
No
Return to START
Yes
R
eturn to START
No
Replace power supply
switch
R
eturn to START
Yes
C
h
e
c
k
,
r
e
p
a
i
r
m
a
c
h
i
n
e
board or replace it
R
eturn to START
No
Check
,
repair machine
board or replace it
Return to
START
No
Replace transformer
Return to START

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2– 2 Troubleshooting table
Error message
Causes
LCD,
backlight board
or
buzzer
does not work
1. Cell or transformer fault
2. Power switch fault
3. Power circuit fault
4. LCD or related LCD circuit fault
5. Backlight board or backlight related circuit fault
6. Buzzer fault or buzzer circuit fault
7. CPU or oscillating circuit fault
AC current or
cell can’t be
used.
1. Power socket fault
2. Transformer fault
3. Cell fault
4. Power circuit fault
5. Main board fault
Err5 1. Overload (max weighing +9e)
2. Too high or inaccurate calibrated COUNT value.
Cell sign 1. Insufficient cell voltage or cell failure
2. Main board fault
Instable
indication
1. The pan is interfered by any article.
2. There is strong wind or vibration nearby.
3. The cell voltage is insufficient.
4. There is external electromagnetic interference.
Bad linearity 1. The pan is interfered by any article.
2. Bad L/C
2– 3 Confirmation of the application environment
a. Is there a strong wind in the workplace?
b. Is there vibration or instability in the workplace?
c. Is there any article on the pan?
d. Is the stainless steel pan placed on the tray?
e. Has the screw for transport protection been removed?
f. Is the scale set on a horizontal plane?
2 –4 Simple inspection of electric circuit
a. Check if the power supply is normal

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1. Is the voltage 5V at both E+ and E- terminals? Check whether the CPU supply is normal.
b. Check the signal input
1. Check if the outputs from S+ and S- terminals to G change in accordance with the weight on
the pan.
c. Check the digital signals
(1) Check if there is oscillation in Y1’s output pin.
(2) Check if there is oscillation in Y2’s output pin.
2 – 5 Performance Inspection
a. Repetitiveness
Put the weight of two thirds of the load on the pan for five times , the indication difference
between different times should be less than or equal to one division value.
b. Unbalanced loading error
Put the weight of one third of the load on the pan (as shown in the figure). Check if the figure is
precise. The indication difference between the four corners should be less than or equal to one
division value.
a
b
c
d
e
c. Linearity
Load conditions Permissible error
Idle ~ one third of the load 0 e
One third of the load ~ two thirds of the load 1 e
Two thirds of the load ~ full load 2 e

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3. Maintenance and Setting
3 – 1 Maintenance flow
3 –2 Model setting
Model setting: Press MR to turn on the unit (the LCD will display 3.0000) and then press UNIT
to select the unit model (for example:1.50000, 3.0000, 6.0000, 7.5000, 15.0000, 30.000 ).
Press G/N and the unit will display “dIu-01” and enter accuracy selection. Press UNIT to
select from diu-01 (1/30000), diu-02 (1/15000), diu-03(1/6000), diu-04 (1/3000), etc. and then
press G/N to store the setting and return to the weighing mode.
Refer to Page 9
Refer to Page 17
Refer to Page 19
Refer to Page 10
Refer to Page 8
Change LOAD-CELL
Model setting
Linear calibration
Single point calibration
Parameter setting
Performance inspection

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4. Setting of Parameters
4-1 Parameter setting
(1). In weighing mode, pre
ss and hold
down
for 3s or press
and release it till
the unit is
on.
will appear first and
then a parameter value such as
” ”
will appear, accompanied
by an auxiliary sign .
(2). Use or
to select the
parameter items (as sh
own in the
table below).
(3). Use or
to select
the values of parameters.
(4).
When the setting is completed,
press
to store the setting
and return to the weighing mode.

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4-2 Description of parameter values
Item
Function
Display
Description
P00
Automatic turn-off
will be
executed when the
weight is smaller
than 9 divisions.
☆ No setting
5 min
10 min
30 min
60 min
90 min
P01 Buzzer beep
There will be an acoustic warning
when the weight of the material is
between the preset upper and lower
limits (including the upper and lower
limits).
There will be an acoustic warning
when the weight of the material is
beyond the preset upper and lower
limits and the weight is more than 20
divisions.
There will be an acoustic warning
when the weight of the material
is less
than the preset lower limit and the
weight is more than 20 divisions.
☆
There will be an acoustic warning
when the weight of the material
exceeds the preset upper limit.
P02 Printer selection
☆ PC output
Dot-matrix
Automatic sticking, paper size:
5cm*3cm
Automatic sticking, paper size:
5cm*3cm
Automatic sticking, paper size:
5cm*3cm
P03 RS-232
transmission rate
The transmission rate is 2400
The transmission rate is 4800

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☆ The transmission rate is 9600
P04
Turn-on or off of
the weight check
memory
Automatic turn-
on of the check
mode
when the unit is turned on
next time.
☆
No automatic turn-
on of the
check mode
when the unit is
turned on next time.
P05 Parity check
☆
No parity.
The parity can be odd or even.
P06 Backlight selection
Backlight display will be on
for
the whole process
No backlight display
☆
Backlight display
will be on
when the weight is greater t
han
9 divisions.
P07 Printing mode
selection
Manual printing
☆
Stable printing (the next
printing
will be made only when the
indication is returned to zero.)
Continuous printing
P08 Filter grade
selection
☆ Worst vibration resistance
Average vibration resistance
Good vibration resistance
Best vibration resistance
P09 Zero indication
range
☆
No restriction on the zero
indication

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At a zero
indication, only when
at least 2 divisions
or above is
put on the pan will a value be
indicated.
At a zero indication, only when
at least 3 divisions
or above is
put on the pan will a value be
indicated.
At a zero indication,
only when
at least 4 divisions
or above is
put on the pan will a value be
indicated.
At a zero indication,
only when
at least 5 divisions
or above is
put on the pan will a value be
indicated.
At a zero indication
, only when
at least 6 divisions
or above is
put on the pan will a value be
indicated.
P10 Factory initialized
setting It is a factory set value.
P11 Unit setting
The specific operation is as
follows:
4-3 Unit setting
(1). Mode 1: press
to turn
on the unit till the left picture
appears.
Mode 2: in the weighing

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mode, press for
about
3s, press or
to
select the parameter P11
and
press to
enter the left
picture with
appearing on
the lower left corner.
(2). Press
to select the
unit from g\ kg\ lb\ jin-liang
for
the scale.
(3). Press
to store the
select
ion and switch to the
setting of unit for use, with
appearing on the
lower
left corner.
(4). Press t
o switch the
unit for use. Press
to select turn-on or turn-off
of
this unit.

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(5). Press
to store the
selection and switch to the
memo
ry unit of the scale,
with
appearing on the
lower left corner.
(6).Press and select YES
(the unit will be the previously
used one when the scale is
turned on) or NO (the unit will
be a newly set one when the
scale is turned on).
(7).Press to store the
selection and return to the
weighing mode.
Note: If the unit setting is accessed from the
parameter options or by Mode 2, press
to store the selection and then press
to return to the weighing mode.

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5. Linear Calibration
☆
☆☆
☆ If the linear calibration is made, there is no need to make the single
point calibration. If the sensor has a good linearity, make the single
point calibration directly.
(1).Press
to turn on the
unit and release the key when
appears on the LCD,
the
linear calibration mode is entered.
(2).Press
to do the zero
point calibration and wait for ON 0
to appear (No weight is put
on the
pan at this time).
(3).
Wait till ON 1 flickers on the
LCD and put on th
e weight 1/3 of
the full load. For example, 1/3 of
the weighing 30kg is 10kg.

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(4).
Wait till ON 2 flickers on the
LCD and put on the weight 2/3 of
the full load. For example, 2/3 of
the weighing 30kg is 20kg.
(5).
Wait till ON 3 flickers on the
LCD and put on the weight of the
full load.
(6). Wait till PASS
appears. Now,
take away the load from the pan.
(7).Press
to return to the
weighing mode.

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6. Single Point Calibration(底下少圖
底下少圖底下少圖
底下少圖)
(1).Press
to turn on the
unit
and release the key when
appears, the single
point calibration mode
is
entered.
(2). Press
and wait till
ZERO flickers. Now make
the
single point calibration.
(3). Wait till a
value appears and
the most right digit flickers. Press
or to move
the
flicker right or left.
(4). Press or
to
alter the value.
(5).
After the setting, put a
corresponding weight on the pan
and press
. When the LCD
flickers, make the single
point
calibration.

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(6).
Wait till PASS appears. Now,
take away the load from the pan.
(7). Press
to return to the
weighing mode.