JAC 929
Service
Guide
NUWEIGH
JAC 929/939/
949/838/101
Electronic Scale
Service Guide
2
INDEX
IMPORTANT NOTE ON THE ACCURACY OF YOUR SCALES...............................
3-4
INTRODUCTION.........................................................................................................
3-4
THE ASSIGNMENT OF RS232 OR PRINTER OR RELAY OUTPUT........................5-7
FUNCTION SETTING ...............................................................................................................8-20
F0 ⇒ WEIGHT CALIBRATION .............................................................................................. 9
F1 ⇒ SPECIFICATION SETTING ……………………………………………………………….. 10
F2 ⇒ NOISE FILTER SETTING.......................................................................................... 1 1
F3 ⇒ ZERO DISPLAY SETTING .................. ……………………………………………………12
F4 ⇒ CHECK-WEIGHING FUNCTION ……………………………………………………… 13
F5 ⇒ RS232 OR SERIAL PRINTER OUTPUT ……………………………………… 14-17
F6 ⇒ EXIT FROM SETTING MODE ………………………………………………………… 18
F7 ⇒ SHOWING THE INTERNAL VALUE ………………………………………………… 18
F8 ⇒ HOLD FUNCTION SETTING ………………………………………………………… 19
F9 ⇒ SOFTWARE LOCK SETTING ………………………………………………………… 20
LINEARITY CALIBRATION INSTRUCTION …………………………………………… 21-22
C1 ⇒ Zero setting while machine turning on ……………………………………………… 21
C2 ⇒ Quit from setting mode …………………………………………………………………. 21
C0 ⇒ Linearity procedures …………………………………………………………………… 22
AP PEN DI X 1 : TABLE LIST FOR THE DIFFERENT SPECIFICATION SETTING … 22-23
APPENDIX 2 : LINEARITY TABLE LIST ……………………………………………………..… 24
WIRING DETAILS………….…………………………………………………………………………………...26
Service Guide
3
IMPORTANT NOTE ON THE ACCURACY
OF YOUR SCALES
NUWEIGH Australia, recommends that your scale/s have regular calibration checks carried out by an
authorised NUWEIGH Service Technician. It is important to ensure regular maintenance and
calibration checks are carried out on your scale/s to maintain a consistent accuracy.
INTRODUCTION
The model HW/TW/AW program version 02001020 can be divided into 2 types :
The standard division scale ( 1 / 3000 ~ 1/ 10000 )
The high precision division scale ( over 1 / 10000 ~ 1 / 15000 )
FEATURES
1. High performance in A/D converter
0.3uv/D sensitivity
Sample speed 16 times / second
Maximum resolution : 15000
Non-linearity 0.01 % FS
-1 mv ~ +5 mv
Used range –1 mv ~ +14 mv
Load cell excitation power 5VDC ±5% 100mA ( c a n b e c o n n ected w i t h 4 s e t s o f 35 0 Ω load cells )
2. Adjustable noise filter setting for the range of stability from 01 ~ 15
3. Depending on the different division for calibration
Standard division (under 10000)
It is necessary to do the capacity setting calibration and weight calibration.
High precision division (over 10000 150000 division)
It must do the linearity calibration, capacity setting calibration, weight calibration.
4. Option with RS232 output and 3 relay output
5. With 3 kinds of HOLD function
6. AC / DC power supply
7. LCD display
8. Auto-power cut off to assure the stability performance
( If the power is below the low battery warning , it will be cut off automatically. )
9. With built-in-backlight
Service Guide
4
ERROR MESSAGE
E1 ⇒ Zero range for turning on machine is over F.S 10%.
E2 ⇒ Zero range for turning on machine is under F.S 10%.
E4 ⇒ Zero range for turning on machine is unstable.
E6 ⇒ Zero range is too high out of its range during calibration mode.
E7 ⇒ Zero range is too low out of its range during calibration mode.
E8 ⇒ Internal resolution is too high out of its range.
Service Guide
5
LOAD CELL INPUT SIGNAL PIN ASSIGMENT
1st pin ⇒ E + ( EXCITATION + )
2
nd
pin ⇒ E - ( EXCITATION - )
3
rd
pin ⇒ S + ( SIGNAL + )
4
th
pin ⇒ S - ( SIGNAL - )
5
th
pin ⇒ SHIELDING WIRE
EXPLANATION MEANING OF KEY SYMBOL ⇒ 12 keys series
.
.
.
.
.
.
.
. .
.
PT
¡÷0¡ö
T
Pcs
R
COUNT SMPL UNITS
Q’TY
SET
lb/kg
PT M+ PST
M+
TGT
SET
ZERO
RE-
CALL
∧
BL
→0←
MR
∧
TARE CE
PRINT
↵
⇒
CE
↵
EXPLANATION MEANING OF KEY SYMBOL ⇒ 10 keys series
Pcs
.
.
.
.
.
.
.
. .
.
R
¡÷0¡ö
T
COUNT SMPL UNITS
kg
M+
+
ZERO
RE-
CALL
∧
BL
∧
TARE CE
PRINT
↵
⇒
CE
↵
Service Guide
6
THE ASSIGNMENT OF RS232 OR PRINTER OR RELAY
OUTPUT
(OPTIONAL FUNCTION)
RS232 OR SERIAL PRINT OUTPUT
1. Transmitting mode, baud rate setting and data format (please refer to F5 function setting).
2. RS232(DB25PIN) pin assignment
˙ J1 and J3 SHORT ; J2 and J4 OPEN ( Default)
2nd pin ⇒ RXD
3
rd
pin ⇒ TXD
7
th
pin ⇒ GND
Other pins are non-pins
˙ J2 and J4 SHORT ; J1 and J2 OPEN
2
nd
pin ⇒ TXD
3
rd
pin ⇒ RXD
7
th
pin ⇒ GND
Other pins are non-pins
RELAY OUTPUT
1. RELAY OUTPUT
To set the relay function (Hi, Lo, Ok) by the TGT SET key in the function F4 Check-Weighing
mode. When the weight is in Low limit, the Lo data output sent out ; When the weight is
in OK limit, the OK data output sent out ; When the weight is in High limit, the High data
output sent out.
Please refer to function F4 Check-Weighing setting.
2.
THE PINS ASSIGNMENT
PIN 1 ⇒ OK
output
PIN 2 ⇒ High output
PIN 3 ⇒ Low
output
PIN 4 ⇒ VDD
PIN 5 ⇒ GND
PIN 6 ⇒ COMMON
3.
CONNECTION ILLUSTRATION
Service Guide
7
4. RELAY CIRCUIT DESCRIPTION
The relay output circuit board can be supplied by the external AC power or internal DC power .
c Relay output with the external power
PIN4 and PIN5 connected with input AC power ; J1 and J2 OPEN
d Relay output with the internal DC power
PIN4 and PIN5 are non-connection to any power ; J1 and J2 SHORT
5.
CONNECTION SETTING
OK, High, Low can be set separately at NO (normal open status) or NC (normal close status)
c OKHighLow at NO ( normal open status) ⇒ default
d OKHighLow at NC( normal close status)
Please use a knife to cut the J3, J4 and J5 not connect (open) and solder the
J6, J7 and J8 connected.
Service Guide
8
FUNCTION SETTING
♦ Turn on the machine, while the scale is counting backward to zero, press and hold
ZERO
key
until the display appears the program version no. “ ”.
Then, release your finger from
ZERO
key, the display will appear “ ” in the calibration mode.
Press
TARE
Press ∧
Press
TARE
Press ∧
Press
TARE
Press ∧
Press
TARE
Press ∧
Press
TARE
Press ∧
Press
TARE
Press ∧
Press
TARE
Press ∧
Press
TARE
Press ∧
Press
TARE
Press ∧
Press
TARE
Press ∧
⇒ WEIGHT CALIBRATION
⇒ SPECIFICATION SETTING
⇒ NOISE FILTER SETTING
⇒ ZERO DISPLAY SETTING
⇒ CHECK-WEIGHING SETTING
⇒ RS232 OR SERIAL PRINTER SETTING
⇒ EXIT FROM SETTING MODE
⇒ SHOWING THE INTERNAL VALUES
⇒ HOLD FUNCTION SETTING
⇒ SOFTWARE LOCK SETTING
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