Vetek JWL-1 User manual

Vetek Weighing AB www.vetek.com JWL Service 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