Vishay Nobel WST 3 Operating Instructions, Quick Installation
GB
Transmitter
WST 3
From prog. name W001A100
Operating instructions,
Quick installation
Transmitter WST 3
Contents
Introduction
....................................................................... 2
Operating instruction
General .......................................................... 3
Power supply .................................................. 3
Start-up .......................................................... 3
Views in Operating mode ............................... 4
Taring ............................................................. 5
Display of Gross/Net ...................................... 5
Zero setting .................................................... 6
Installation
Mechanical installation ................................... 7
Electrical installation ...................................... 7
Set-up programme deltaCOM ........................ 8
Quick set-up, calibration
General .......................................................... 9
Common parameters ..................................... 9
Data sheet calibration .................................. 13
Dead weight calibration ................................ 16
Parameter survey
...................................................................... 20
Quick set-up list
................................................................ App. 1
1
Operating instructions, Quick installation
Introduction
WST 3 is a high performance transmitter, designed for industrial measuring
by means of strain gauge transducers. It can be used as a slave unit,
communicating with a network master/PLC by Modbus or Profibus.
The network can be used for transmission of commands and measurement
values and also for set-up of the transmitter.
The compact transmitter is easy to install on a DIN rail or a flat surface.
This instruction includes the basic installation and quick set-up, required for
correct measurement with the transmitter.
Additional installation and set-up of more functions, not covered by this
description, can also be performed.
For a complete transmitter description, refer to publication 600 630:
WST 3 Technical Manual
This description deals with the following points:
• Measurement by the WST 3 panel.
• Quick installation.
• ‘Quick set-up’ for WST 3.
• Data sheet calibration.
• Deadweight calibration in two points.
• Set-up programme deltaCOM.
This description does NOT deal with the following points:
• Connection of relay output.
• Complete set-up (password, filters etc.).
• Adjustment of levels and relay functions.
• Adjustment of the analogue output.
• Using the Modbus and Profibus communication.
• Table calibration.
• Troubleshooting.
• Diagnostics.
Transducer
Digital inputs
Figure 1. All connections to WST 3 are made through terminal block or connector.
2
WST 3
24 V DC
Analogue output
Relay outputs
Modbus
Profibus-DP
Control unit,
Profibus
Control unit (deltaCOM)
or
External display
Transmitter WST 3
Operating instructions
General
This section describes the display and the function key operation when WST 3
is in normal Operating mode.
Power supply
Power supply to the transmitter should not be turned off during week-ends and overnight. Continuous power supply to electronics and transducers prevents moisture
condensation in the units.
Start-up
As soon as power is connected to the transmitter, start-up is performed.
The text ‘WST 3’, the programme name and the serial number of the transmitter
are displayed for about five seconds.
Then WST 3 is automatically switched over into Operating mode.
(If the transmitter is set for operator start-up, the text
‘Press ENTER to start WST’ is displayed until the function key
to the right is pressed and the transmitter enters Operating mode.)
If an error occurs the start-up halts and an error message is displayed.
Error codes and error corrections are described in the Technical Manual for WST 3,
section 8, Troubleshooting.
As WST 3 enters in Operating mode, the first view is a standard view. It contains
the measurement value, status of the used relays (R1:/R2: '1' = on or '0' = off) and
at the lower right corner an area with information about the Modbus communication.
In this area 'EXT' means serial communication to an external display. An 'address'
means that the transmitter is set for Modbus communication with a master unit, and
the address flashes as a message to the transmitter is received. If the area is empty
this means that the serial communication is not in use.
Net 123.4 kg
R1:1 R2:1 001
WST 3
Figure 2. Front view of WST 3 in Operating mode. A weight value and
information about relay status and Modbus address is displayed.
3
Operating instructions, Quick installation
Views in Operating mode
As WST 3 is in Operating mode the views Weight value and Profibus status are
always available. The remaining views can be set On or Off by parameters under
'Main menu General'.
Function keys
by swiftly pressing
From any view, WST 3 switches to Quick set-up mode as the function key
and are used for selection among the available views and
WST 3 can always be switched to the Weight value view.
is pressed for 2 seconds.
Weight value, normal view.
This view is always available. It is the first view displayed after start-up, reset or
set-up mode.
The upper line displays the actual weight value as net weight (Net) or gross weight.
The lower line displays status for the used relays, R1:/R2: '1' = on or '0' = off,
and an area for the Modbus address or information about the serial communication.
Zero setting.
This view is made available by parameter 'Zero function'. It displays the actual weight
value as net weight (Net) or gross weight.
As gross weight is displayed it can be set to zero by the ENTER-key
.
By zero setting of the gross weight, the actual tare value is also set to zero.
Start up/Reset
Weight value
Always On
Net 123.4 kg
R1:1 R2:1 001
Zero setting
Set On/Off in Zero function
Analogue output signal
Set On/Off in More views
Level settings
Set On/Off in More views
Input signal
Set On/Off in More views
S/N:, Progr.
Set On/Off in More views
Profibus status
Always On
Net 123.4 kg
Zero
Net 123.4 kg
5.430 V 001
L1 99999.9 kg
L2 0.0 kg
0.18200mV/V
R1:1 R2:1 001
S/N: XX-XXXX
Progr. XXXXXXXX
Profibus-DP 010
Online
Figure 3. WST 3 in Operating mode can always display Weight value and Profibus status.
Depending on the setting, alternative views can also be displayed.
4
Transmitter WST 3
Analogue output.
This view can be made available by parameter 'More views'.
The upper line displays the actual weight value as net weight (Net) or gross weight.
The lower line displays the analogue output signal and the Modbus information area.
Level settings.
This view can be made available by parameter 'More views'.
The upper line displays the switching level used by 'Level/Setpoint 1' and
the lower line displays the switching level used by 'Level/Setpoint 2'.
Input signal.
This view can be made available by parameter 'More views'.
The upper line displays the actual transducer input signal in mV/V.
The lower line displays status for the used relays, R1:/R2: '1' = on or '0' = off,
and the Modbus information area.
S/N:, Progr.
This view can be made available by parameter 'More views'.
The upper line displays the transmitter serial number and
the lower line displays the name of the installed programme.
Profibus status.
This view is always available.
The upper line displays the Profibus address of the transmitter and
the lower line contains status information for the Profibus communication.
Taring
Taring means storing the actual gross weight as a tare value and switching WST 3 over
to display of net weight. The net weight is the difference between the gross weight and
the tare value.
Taring of WST 3 is always possible as the weight value is valid.
Taring is performed as digital input IN1 (terminal 15) is activated with 24 VDC.
The tare value is automatically set to zero by zero setting of the WST 3.
Display of Gross/Net
By weight display, an area to the left of the weight value displays 'Net' when
the net weight is displayed.
If the area is empty, the displayed weight is the gross weight.
Switching between display of net weight and gross weight takes place as
digital input IN2 (terminal 16) is activated with 24 VDC.
5
Operating instructions, Quick installation
Zero setting
Minor correction of the zero setting can be performed during normal operation from
the ‘Zero setting’ view, see page 4.
But to perform a basic zero setting of the gross weight, the normal operation must be
interrupted and the following sequence carried out with WST 3 in set-up mode.
This type of zero setting is a part of the calibration sequences, but a separate zero
setting may also be needed, for example if the equipment on the scale has been
changed, influencing the weight.
Procedure for basic zero setting
1. Check that the scale is unloaded before performing the zero setting.
2. Switch to set-up mode by holding ESCAPE (
3. Enter the valid password, if this is demanded.
4. The text ‘Main menu Quick set-up’ is displayed.
Press ENTER (
5. The first parameter name, ‘Language’, is displayed.
Press
for ‘Set zero’ is a live weight value.
6. Press
to the left on the lower line.
(The zero setting can be cancelled by pressing
7. Press and hold
The cursor disappears and a live weight value is displayed.
8. Press
(The ‘Zero offset’ value can be used for set-up of a replacement unit.)
9. Press
The display changes to ‘Main menu Exit set-up.’
10. Press
The display changes to ‘Save changes? No Esc. Yes’.
a number of times until ‘Set zero’ is displayed. The parameter value
. The parameter value is set to zero and a flashing cursor appears
, read and make a note of the ‘Zero offset’ value in Appendix 1.
.
.
).
for 2 seconds to confirm the new setting.
) pressed for 2 seconds.
)
(Press
11. Press
or
Press
12. WST 3 restarts with the selected zero setting.
6
(Esc.) if you do not wish to exit from the set-up mode.)
(No) to cancel the change and return to the previous zero setting,
(Yes) to save the new zero setting in WST 3.
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