CAS NT-302A User manual

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CONTENTS
1. Before Installation
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2 Page
2. Introduction
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3 Page
3. Specification
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4 Page
4. Installation
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10 Page
5. Set-Up
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12 Page
6.Interface
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31 Page
7.Error and Treatment
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40 Page
8.Warantee
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43 Page

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1. BEFORE INSTALLATION
1-1. Caution / Warning Marks
This mark warns the possibility to arrive death or serious injury in
case of wrongly used.
This mark cautions the possibility to arrive serious human body
injury or product lose in case of wrongly used.
1-2. Other Marks
Warning for Electric Shock or Damage.
Please do not touch by hand
Protective Ground(Earth) terminal
Prohibition of Operation process
1-3. Copy Rights
1). All Right and Authority for this Manual is belonged to CAS co.,Ltd.
2). Any kinds of copy or distribution without CAS co.,Ltd.’s permission will be prohibited.
1-4. Inquiries
If you have any kinds of inquiries for this model, please contact with your local agent or Head
Office.
Head Office : CAS co.,Ltd.
Overseas Office : CAS Inc
Website : http://www.cas.co.kr
Warning
Caution

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2. INTRODUCTION
2-1. Introduction
Thank you for your choice, this “NT-302A” Industrial Digital Weighing Indictor..
This “NT-302A” model is simple application usage Digital Weighing Indicator, with powerful
communication performance.
With 6pcs control relay outputs and High Speed A/D conversion performance will lead you to
precise weighing process.
This “NT-302A” Weighing Indicator is simple application model, and it can be used for most
kinds of control applications.
Please review this instruction Manual and learn more about information about “NT-302A”.
Enjoy your process efficiency with “NT-302A” Weighing Indicator..
2-2. Cautions
1). Don’t drop on the ground or avoid serious external damage on item.
2). Don’t install under sunshine or heavy vibrated condition.
3). Don’t install place where high voltage or heavy electric noise condition.
4). When you connect with other devices, please turn off the power of item.
5). Avoid from water damage.
6). For the improvement of function or performance, we can change item specification without
prior notice or permission.
7). Item’s performance will be up-dated continuously base on previous version’s performance.
2-3. Features
1). All Modules and Option Cards are isolated to maximize accuracy and performance.
2). External input terminal inside.
3). By using “Photo-Coupler” on each module(Option, Analog board, In/Out), we improved
“Impedance problem”, “Isolation ability among inputs”, “Leading power problem”, and
“Noise covering function”.
4). Data back-up function, when the sudden power off
5). Polycarbonate film panel, strong against dust and water
6). RS-232C (Com. Port1) is standard installed.
8). Variable options(Order in advance)
2-4. Box Contents
1). Power Cable(1pcs) / Fuse(2pcs) / Load cell Connector(1pcs) / Manual(1pcs)
Cautions
!

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3. SPECIFICATION
3-1. Analog Input & A/D Conversion
Input Sensitivity
0.2㎶/ Digit
Load Cell Excitation
DC 10V ( - 5V ~ + 5V )
Max. Signal Input Voltage
Max.32mV
Temperature Coefficient
[Zero] ±20PPM/℃
[Span] ±20PPM/℃
Input Noise
±0.6㎶P.P
Input Impedance
Over 10㏁
A/D Conversion Method
Sigma-Delta
A/D Resolution(Internal)
520,000 Count(19bit)
A/D Sampling Rate
Max. 200times / Sec
Non-Linearity
0.005% FS
Display Resolution(External)
1/20,000
3-2. Digital Part
Display
Parts
Specification
Display
Main Display
7Segments, 7digits Red color LED
Size :20.0(H) ×13.0(W)mm
Min. Division
×1, ×2, ×5, ×10, ×20, ×50
Max. display value
+999,950
Under Zero value
"-" (Minus display)
Status lamp
Steady, Zero, Tare,
SP1, SP2, SP3, SP4,
RTxD
Green color Condition display Lamp (8pcs)
K e y
Number, Function Key
Number Key, Function (16pcs)

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3-3. General Specification
Power Supply
SMPS Free Voltage Power Supply(AC86~265V)
Operating Temperature Range
-10℃~ 40℃
Operating Humidity Range
Under 85% Rh (non-condensing)
External Dimension
193mm(W)ｘ100mm(H)ｘ140mm(L)
Net Weight(kg)
About 1.5kg
Gross Weight(kg)
About 2.0kg
3-4. Option Card
Option No.1
Analogue Output (0~10V)
Option No.2
Analogue Output (4~20mA)
Option No.3
Serial Interface : RS422 / RS485
Option No.4
BCD Input
Option No.5
BCD Output
※Serial Interface (RS-232C) or Current Loop is Standard installed.
3-5. Front Panel (Display & Key pad)

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3-5-1. Status Lamp (ANNUNCIATORS) : Green Color Lamp is “ON”.
Steady
When the weight is Steady, “▼” Lamp is turn on.
Zero
When the current weight is Zero, “▼” Lamp is turn on.
(Displayed weight is Zero, “▼” Lamp is turn on.)
Tare
Tare function is set, “▼” Lamp is turn on.
(Tare Reset “▼” Lamp is turn off.)
SP1
SP1 Relay output Lamp
SP2
SP2 Relay output Lamp
SP3
SP3 Relay output Lamp
SP4
SP4 Relay output Lamp
RTxd
When indicator transfers or receives data from other devices, Lamp is turn
on. (If the Lamp is off although there is some data transference, please
check communication settings).
3-5-2. Key Pad Function
Make Weight value as Zero.
Under F08, you can set the Zero key operation range, as 2%, 5%, 10%,
20% or 100% of Max. Capacity.
※Under “Tare” key input, Zero key will not be activate within operation
range.
Make Weight value as Zero, including Tare Weight.
Under F09, you can set the Tare key operation range, as 10%, 20%, 50%,
or 100% of Max. Capacity.
※Whenever pressing “Tare” key, you can set the Tare continuously.
TARE RESET
1. Remove the Set TARE function.
- If you press this key, TARE set value will be removed and display gross
weight.
HOLD RESET
1. Remove the Set HOLD function.
- If you press this key, HOLD set value will be removed.
Start Weighing process, under Packer Mode, only.
Stop weighing process, under Packer Mode, only.

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You can set each weighing process as a certain P/N.
And you can call certain P/N with pressing this key.
P/N save : Select P/N and Enter key input.
P/N call : P/N + Number key + Enter
Set the SP1 value or Check the current value.
- Press key and enter new set value with keypad, and press enter to save.
Under Print installation, you can print out the “Sub-total data” of current P/N.
Printed Data : Accumulated count and weight of All P/N.
Under Print installation, you can print out the “Grand-total data” of all P/N.
Printed Data : Accumulated count and weight of All P/N.
Set the SP2 value or Check the current value.
- Press key and enter new set value with keypad, and press enter to save.
Set the SP3 value or Check the current value.
- Press key and enter new set value with keypad, and press enter to save.
Set the SP4 value or Check the current value.
- Press key and enter new set value with keypad, and press enter to save.
Manual Printer
- Key input, print output.
Calibration mode
- Digit setting
Whenever pressing “0”key, digit will be change 1, 2, 5, 10, and 50.
1. Modify the set value during setting process.
2. Calibration mode
- Move back to previous step.
3. F-function setting mode
- Change F-function No.
F-function no.(number key) + Clear directly move
1. Save set value during setting process.
2. Calibration mode
- Save current setting and move to next step.
3. F-Function mode
- Save current F-function setting, and move to next F-function

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※Function Keys (Combined Key functions : key + other keys)
Time set value check or Change
Date set value check or Change
Code value check or Change
Serial No. check or change
Sub-total Data Delete
Grand-total Data Delete

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3-6. Rear Panel
①POWER
-Power ON/OFF Switch
-Fuse : AC 250V 10A
-AC IN : AC86~265V Power In
②OPTION 1,2
- OPTION BOARD install slot.
- ANALOG out, Serial I/F, etc
③LOAD CELL
CONNECTOR
(N-16)
-EXC + (+5V) PIN1 (RED)
-EXC - (-5V) PIN2 (WHITE)
-SIG+ PIN3 (GREEN)
-SIG- PIN4 (BLUE)
-SHIELD PIN5 (SHEILD)
④Digital Input
- Digital Input Signal terminal
Refer to “F-function 11”.
⑤Output
Terminal
-RS-232C/CURRENTLOOP (Standard Installed)
( GND,TXD1,CL1,CL2,RXD,GND,TXD )
⑥ISP
(Digital Lock Pin)
- Insert “Lock Pin Header”, to protect “F-function”data and other
settings from Electric Noise effect.
- To change the setting, please remove the “Lock Pin Header”.
⑦Relay Output
6pcs Relay output terminal
- According to “F21-XX”setting, relay will be output.
Power
Digital Input
Output
ISP
Option
Slot
Load Cell
Connector
Comm.

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4. INSTALLATION
4-1. External Dimension & Cutting Size
(External Dimension) (unit : mm)
Cutting Size

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4-2. Formula to plan the precise weighing system
This “NT-302A” weighing controller’s Max. input sensitivity is 0.45㎶/ Digit.
And for precise weighing system, the following formula must be satisfied.
Caution : “Input sensitivity” means Min. output voltage variation of weighing part to change
1digit. So, please do not make large input voltage to make reliable weighing system.
Single Load cell use
≤EⅹBⅹD
A : Load cell capacity(kg)
B : Load cell Voltage(mV)
D : Digit
E : affirmation Voltage of Load cell
N : Number of Load cell
0.45㎶
A
Plural Load cells use
≤EⅹBⅹD
0.45㎶
AⅹN
Example1.)
Number of Load cell : 1pcs
Load cell capacity : 500kg
Load cell Voltage : 2mV/V
Digit : 0.05kg
Affirmation Voltage of Load cell : 5.0V
Max. Capacity of Weighing System : 300kg
Then, estimation result for this weighing system with formula,
5000ⅹ2ⅹ0.05
= 1 ≥ 0.45㎶
The calculated value is larger than 0.45㎶,
so this system has no problem.
500
Example2.)
Number of Load cell : 4pcs
Load cell capacity : 500kg
Load cell Voltage : 2mV/V
Digit : 0.10kg
Affirmation Voltage of Load cell : 5.0V
Max. Capacity of Weighing System : 1,000kg
Then, estimation result for this weighing system with formula,
5000ⅹ2ⅹ0.10
= 0.5 ≥ 0.45㎶
The calculated value is larger than
0.45㎶, so this system has no problem.
500ⅹ4
Cautions
!

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5. SET-UP
5-1. Calibration
Adjust weight balance between “Real weight” on the load cell(Weight Part) and “Displayed weight of
Indicator”. When you replace LOAD CELL or Indicator, you have to do Calibration process once again
5-2. Test Weight Calibration
Prepare At least 10% of Max. capacity of your weighing scale
Step 1. Enter Calibration Mode
Turn on the Power + 3 KEY display
Press 3 KEY key display
Press ENTER key to start “Calibration Mode”.
Remarks : Go to next step with save ENTER key / Back to previous step CLEAR key
Step 2. Digit(Division)setting ( display)
Press 0 KEY and stop the optimal Digit value.
(Whenever pressing 0 KEY, digit value will be changed, like 01-02-05-10-20-50)
Press ENTER KEY and save change and move to next step.
TEST
SET-CAL
d _1

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Step 3. Max. Capacity Setting ( display)
Input Max. Capacity of Scale with No. keys.
Input Capacity and press ENTER KEY, and move to next step.
※Caution
(Max. capacity value / division value) can not be over 20,000.(as Indicator resolution is 1/200,00).
Step 4. Zero Balance setting ( display)
Make empty the scale part, and press ENTER KEY.
Indicator check the current Zero balance and save the value and move next step.
Step 5. Span value calculation (   )
Input prepared Test weight value with No. keys.
And press ENTER KEY.
Then, display will show and then, load prepared test weight unit on the scale.
After a few seconds(to remove the vibration effect), press ENTER KEY.
Then, indicator will calculate Span value and move the next step.
※Caution
For the precise Span calibration, please prepare Test weight unit, at least 10% of Max. capacity
of Scale.
Step 6. Check Span Value and Finish the Calibration( )
Check the Calculated Span value.
And after 3sec, will displayed automatically and move to weighing Mode.
CAPA
XXXXXX
CAL _0_
SPAN
XXXXX
C_UP_
C_UP_
XXXXXX
C-END
C-END

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5-3. Function Setting
To make more accuracy performance of NT-301A, through this Function setting.
Step 1. Enter to Function setting mode.
Turn on the Power + 3 KEY display
Press 3 KEY display
Press CLEAR KEY to start “F-function Mode”.
Step 2. Change the F-Function No.
To change the F-function No., press CLEAR KEY.
Whenever pressing CLEAR KEY, Function No. will be changed
If you want to move certain function No. directly, press function No. with keypad and press
CLEAR KEY.
Step 3. Change the Set value.
Input new set value with keypad, and press ENTER KEY to save new setting.
If you don’t press ENTER KEY, after changing the set value, the new set value will not be saved.
Step 4. Exit from Function setting mode.
Press 0 KEY + CLEAR KEY + 0 KEY to exit function mode.
TEST
SET-CAL

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`
5-4. Function List
Function
No.
Contents
Remark
F00
Set-up / Calibration Mode Selection
Set-up : Clear key
Calibration : Enter key
F01
Decimal point setting
Setting range : 0, 1, 2, 3
F02
Back up mode selection
Setting range : 0, 1
F03
Motion Band setting
Setting range : 0 ~9
F04
Zero Tracking setting
Setting range : 0~ 9
F05
Auto Zero Range setting
Setting range : 0~99
F06
Digital Filter setting
Setting range : 1~49
F07
Zero / Tare key activating setting
Setting range : 0, 1
F08
Zero key operating range setting
Setting range : 0~4
F09
Tare key operating range setting
Setting range : 0~4
F10
Hold Function setting
Setting range : 0~2
F11
Digital Input setting
Setting range : 0~4
F12
Code No. Setting
Setting range : 0~2
F14
Hold Off time setting
Setting range : 0.0 ~ 9.9sec
F21
Weighing Mode Selection
Setting range : 1~4
F22
Weighing Finish Relay “ON”delay time setting
Setting range : 0.0 ~ 9.9sec
F23
Weighing Finish Relay “ON”Duration time setting
Setting range : 0.0 ~ 9.9sec
F24
Weighing Judge Relay “ON”delay time setting
Setting range : 0.0 ~ 9.9sec
F25
Weighing Judge Relay “ON”Duration time setting
Setting range : 0.0 ~ 9.9sec
F30
Serial I/F Parity Bit setting (Port No.1)
Setting range : 0~2
F31
Serial I/F Communication Speed setting (Port No.1)
Setting range : 0~9
F32
Serial I/F Mode setting (Port No.1)
Setting range : 0~2
F33
Serial I/F Transference Method setting (Port No.1)
Setting range : 0~2
F34
ID Number setting
Setting range : 1 ~ 99
F35
Transferred Data Format (Port No.1)
Setting range : 0~2
F36
BCC selection mode
Setting range : 0~1
F37
Data Transference count setting (Port No.1)
Setting range : 0~6
F40
Serial I/F Parity Bit setting (Port No.2-Option)
Setting range : 0~2
F41
Serial I/F Communication Speed setting (Port No.2)
Setting range : 0~9
F42
Serial I/F Mode setting (Port No.2)
Setting range : 0~2
F43
Serial I/F Transference Method setting (Port No.2)
Setting range : 0~2
F45
Transferred Data Format (Port No.2)
Setting range : 0~2

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Function
No.
Contents
Remark
F47
Data Transference count setting (Port No.2)
Setting range : 0~6
F50
Weight Unit Selection (Printer)
Setting range : 0~2
F51
Auto print selection
Setting range : 0~1
F52
Print format selection
Setting range : 0~1
F53
Sub-Total Data delete Selection
Setting range : 0~1
F54
Paper withdraw rate Selection
Setting range : 0~9
F55
Print Line interval Selection
Setting range : 0~9
F56
Sub-Total Print Mode Selection
Setting range : 0~1
F57
Print Language Selection
Setting range : 0~1
F58
Print Delay time selection
Setting range : 0.0 ~ 9.9
F59
Auto Print Setting
Setting range : 0~1
F60
BCD output Selection
Setting range : 0~1
F63
Average Display setting
Setting range : 0.0 ~ 9.9
F64
Steady LED Status Lamp Delay time setting
Setting range : 0.0 ~ 9.9
F65
Tension and Compression setting
Setting range : 0~1
F77
All function Initialize
F80
Empty Range
Setting range : 0~Max. Capa
F81
Zero Range Setting
Setting range : 0~Max. Capa
F82
Zero Value Deduction setting
Setting range : 0~Max. Capa
F83
Analogue output setting
Under option installed
F89
Span Value check
F90
Date check / change
F91
Time check / change

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5-5. Function List detailed information.
Set-Up / Calibration Mode Selection
F00
Clear
Set-Up mode
Enter
Calibration Mode
Decimal Point Setting
F01
●
0
No Decimal point
1
1st place under Zero (0.0)
2
2nd place under Zero (0.00)
3
3rd place under Zero (0.000)
Back up mode selection
F02
●
0
Normal mode
1
Back up mode
Motion Band Range setting
F03
5
0
∫
9
This is set “Steady” acceptable range of weighing part.
If there is vibration on weighing part, you can set this function and
reduce the vibration effect on weighing process.
0 : Weak vibration
∫
3 : Strong Vibration
Zero Tracking Compensation Range setting
F04
5
0
∫
9
Due to external causes(Temperature, wind, and dust), there are small
weight difference, indicator will ignore the weight difference and
display Zero.
For this compensation function, indicator will estimate the weight
difference is over the set range during fixed time period.
If there is large weight difference over set range within fixed time
period, the “Zero” is breaking and will find new zero point.
Auto Zero Range setting
F05
00
00
∫
99
Within the “Auto Zero” range, weighing part is steady, indicator will
display current weight as “Zero”
If the weighing part is not “Steady”, indicator will display current
weight.
(Auto Zero Range : ± Set value + weight unit)
Digital Filter setting
F06
11
1
∫
49
Small set value for weak vibration
Large set value for strong vibration
Small set value more
sensitive

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Zero /Tare key Operation mode selection
F07
●
0
Activate when “Steady” condition, only
1
Always activated
Zero key Operation Range selection
F08
0
Activated within 2% of Max. Capacity
1
Activated within 5% of Max. Capacity
●
2
Activated within 10% of Max. Capacity
3
Activated within 20% of Max. Capacity
4
Activated within 100% of Max. Capacity
Tare key Operation Range selection
F09
0
Activated within 10% of Max. Capacity
1
Activated within 20% of Max. Capacity
●
2
Activated within 50% of Max. Capacity
3
Activated within 100% of Max. Capacity
“Hold” Mode selection
F10
●
0
Peak Hold : Measure Max. weight value and hold on display.
1
Sample Hold : Hold current weight until “Hold Reset”.
2
Average Hold : Make average during 8sec, and hold display
External Input Selection
F11
Set Value
Input 1
Input 2
Input 3
Input 4
0
Zero
Tare/Reset
Hold/Reset
Print
●
1
Run/Stop
Tare/Reset
Zero
Print
2
Run
Stop
Sub-Total
Grand-Total
3
Zero
Tare
Tare Reset
Print
4
Run
Stop
Tare
Tare Reset
5
Run
Stop
Zero
Print
Code No. setting
F12
●
0
Fixed Code No.
1
Increase Code No., whenever finish one weighing process
2
Decrease Code No., whenever finish one weighing process

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Hold “Off”time setting
F14
00
00
∫
99
Time setting of the “Hold Off”
After set time, Hold function will be off automatically.
Weighing Mode Setting
Weighing Mode Selection
F21
●
1
Limit Mode (Weighing mode 1)
2
Packer Mode (Weighing mode 2)
3
Checker 1 Mode (Weighing mode 3)
4
Checker 2 Mode (Weighing mode 4)
Weighing Mode Selection
Relay Output
Out 1
Out 2
Out 3
Out 4
Out 5
Out 6
1
Limit
SP1
SP2
SP3
SP4
Finish
Empty
2
Packer
SP1
SP2
SP3
SP4
Finish
Empty
3
Checker 1
Empty≤SP1
SP1≤SP2
SP2≤SP3
SP3≤SP4
SP4≤
Empty
4
Checker 2
Empty≤SP1
SP1≤SP2
SP2≤SP3
SP3≤SP4
SP4≤
Empty