CAS WTM Series User manual

Service Manual
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WTM
REV NO
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V1.1
WTM Series
(Weight Transmitter)
Service Manual
LAST Rev. NO : V1.1
LAST Rev. Date : 2015. 04. 20

Service Manual
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WTM
REV NO
:
V1.1
Table of Contents
1. Cautions for Your Safety ................................................................................................................................... 3
2. User Wanring ...................................................................................................................................................... 6
3. Features .............................................................................................................................................................. 7
4. Overview ............................................................................................................................................................. 9
5. External Dimension .......................................................................................................................................... 10
6. Installation & Connection ................................................................................................................................ 12
7. Weight Setup (Calibration) Mode .................................................................................................................... 13
8. How to Seal the Indicator (Sealing) ................................................................................................................ 25
9. Installing Options .............................................................................................................................................. 26
10. Interface ......................................................................................................................................................... 27
11. F.W Update Method ....................................................................................................................................... 28
11.1. Enter the F.W update mode(WTM-200) ............................................................................................. 28
11.2. Enter the F.W update mode(WTM-500) ............................................................................................. 28
11.3. F.W update method ............................................................................................................................... 29
12. Exploded Views.............................................................................................................................................. 31
12.1. Exploded view ...................................................................................................................................... 31
13. Partlist ............................................................................................................................................................ 32
13.1. Electronics Parts .................................................................................................................................. 32
13.2. Mechanism Parts .................................................................................................................................. 34
14. Block Diagram ................................................................................................................................................ 35
15. Revision .......................................................................................................................................................... 36

Service Manual
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WTM
REV NO
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V1.1
1. Cautions for Your Safety
‘Please comply with 'Cautions for Your Safety', which will lead you to use the product
safely and properly to prevent any dangerous situations.
■ Cautions are divided into 'Warning' and 'Alert', which mean as follows.
■ Keep this manual in a place where product users can find out, after finish reading it.
'Warning' means a great possibility led to the death or heavy injury when instructions are
violated.
'Alert' means a great possibility led to the injury or material damage when instructions
are violated.

Service Manual
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WTM
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V1.1
Warning
Never disassemble, repair or
retrofit the product.
It might exclude the product
from the quality assurance and
cause the damage to devices,
electric shock or fire.
Ensure
the power plug to be
fully
inserted to prevent shaking.
Any instable connection might
cause electric sparks to set fire.
Ensure the grounding of the
product.
Poor grounding might cause
failure or electric shock upon
electric leak.
Do not damage, process,
excessively jerk, bend or twist the
power cord.
It might damage the power cord to
cause fire or electric shock.
Keep any combustible spray or
fire source away.
It might cause fire.
Do not spray water to the outside
of the product or use it in any
humid place.
It might deteriorate the insulation
of
electric parts that can cause
the electric shock, fire risk or
weighing errors.
Do not place the product to the
direct sunlight or near any hot
object like a heater.
It might cause fire.

Service Manual
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WTM
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V1.1
Attention
Check the weighing error anytime
for the accurate weighing.
Any use out of the allowed tolerance
for the careless use or other causes
might not ensure the accurate
weighing.
Customer Service：080-022-0022
Avoid any sudden shock to the
product.
It might damage the product to
fail the accurate weighing.
Find a proper place to attach the
rubber pad at the bottom of the
indicator, which was shipped
together.
Do not use the product at a place
with sudden temperature changes or
severe vibrations.
It might cause the weighing error or
failure.
Do not install the produce at a place with the excessive
electromagnetic wave.
It might cause the wrong weighing.
Our Dealers : CAS feels that each of its valued customers should get the best service
available. Whether it’s the initial installation of our product,
maintenance/repair work, or simply answering questions about our
products, CAS Corporation and all of its Authorized Dealers are highly
trained to assist
you with any need regarding CAS products.

Service Manual
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WTM
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V1.1
2. User Wanring
Recommendations for the proper use of weighing instruments
- Keep away from heat sources and direct sunlight
- Repair the instrument from rain(except special IP versions)
- Do not wash with water jet(except special IP versions)
- Do not dip in water
- Do not spill liquid on the instrument
- Do not use solvents to clean the instrument
- Do not install in areas subject to explosion hazard(except special Atex versions)
Recommendations for correct installation of weighing instruments
The terminals indicated on the instrument’s wiring diagram to be connected to earth
must have the same potential as the weighed structure (same earthing pit or earthing
system). If you are unable to ensure this condition, connect with an earthing wire the
terminals of the instrument (including the terminal 0VDC) to the weighed structure.
The cell cable must be individually led to its panel input and not share a conduit with other
cables; connect it directly to the instrument terminal strip without breaking its route with
support terminal strips.
Use “RC” filters on the instrument-driven solenoid valve and remote control switch coils.
Avoid inverters in the instrument panel; if inevitable, use special filters for the inverters
and separate them with sheet metal partitions.
The panel installer must provide electric protections for the instruments (fuses, door lock
switch etc.).
It is advisable to leave the equipment always switched on to prevent the formation of
condensation.
MAXIMUM CABLE LENGTHS
- RS485: 1000 metres with AWG24, shielded and twisted cables
- RS232: 15 metres for baud rates up to 19200

Service Manual
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WTM
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V1.1
3. Features
Power supply Unit
Power supply voltage 10 ~ 24 V
Max consumption 70 with 350 Ω mA
Temperature range
Storage temperature -25 ~ 85 ℃
Operating temperature -10 ~ 40 ℃
Loadcell
Impedance(complete bridge) > 80 Ω
Connection 4 or 6 wires
Loadcell power supply 5 ± 5 % Vdc
Communication
RS485 Half duplex
Baud rate 9600 ~ 115200 BPS
Logical inputs
Numbers 2
type Optocoupler
Low level voltage 0 ~ 3 Vdc
Higi level voltage 9 ~ 24 Vdc
Current at high level 10 mA @ 24 V mA
Insulation voltage 2500 Vrms
Logical outputs
Numbers 4
type
Max current @ 40℃
Max voltage in open state 2 Ω
Insulation voltage 2500 Vrms
Legal for use metrological characteristics
Class III or IIII

Service Manual
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V1.1
Minimum voltage division per
verification scale division 0.5 uV
Maximum voltage for weighing range 39 mV
Programmable functions
Acquisition of zero, taring, zero tracking
Physical or theoretical calibration
Slope correction
Non-linearity polynomial correction
Low pass, band-stop and self-adaptive digital filters
Set points managements
Checkweigher functioning mode
Peak detection functioning mode
Option
Display 7 Segment LED, 4 key
A-Out V-out, I-out -10 V~10 V
0~24 mA
Relay I/O 2input, 4output
Alibi memory 50,000개 Save
Real time clock
Ethernet 10/100 M
Fieldbus Profibus

Service Manual
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V1.1
4. Overview

Service Manual
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V1.1
5. External Dimension
1. Weight : 6Digits, Decimal point, sign
2. Unit : ton, kg, lb
3. Message : Displayed of indicator’s status
Ext Output are 4
Ext Inputs are 2