5.0 USER CONFIGURATION
IMPORTANT
READ COMPLETE SECTION BEFORE ATTEMPTING CONFIGURATION
PARTICULAR CARE SHOULD BE TAKEN REGARDING TIMEOUTS IN MENU 2 & 3
Figure 3 Configuration circuit
User Configuration
User configuration uses three menus, each menu sets a different parameter:-
Menu 1
Set range
Menu 2
Set direction of output on sensor burnout
Menu 3
User trim at 4 mA and 20 mA.
The configuration menus are navigated using the push button and program LED, The
push button is located under the hole in the keyhole shaped wiring label. To press the
button use a 3 mm screw driver (flat blade) inserted into the hole. The button has a slight
click action.
Three types of button press are used:-
•
Single button press
= Advance
•
Double press within 0.5 seconds
= Escape or change direction
•
Press and hold button > two seconds
= Enter
When a menu is selected the Program LED will flash in bursts of one to three flashes, the
number of flashes represents the menu number.
Navigating the menus
•
To access menus, press and hold button > 2 second, then program LED will start
to flash, one flash every burst. This Indicates “menu 1” is selected.
•
Use single button press to advance selection to “menu 2”, the program LED will
now show two flashes per burst. The Next single presses will advance the
selected menu to menu 3 and the next single press will advance selected menu
back to menu 1. Repeated single presses will cycle the selected menu back
around menus 1 to 3, in the above sequence.
•
Double press button to escape from menus, and return to normal. Normal
operation can also be selected by turning transmitter power off and on. Note the
transmitter will not time out and automatically escape from menus.
Using Menus
Menu 1 Range configuration (No Timeout)
Configuration will require the following tools and equipment :-
•
DC Supply (12 to 30) V @ 30 mA
•
Precision resistance decade box to simulate PT100 sensor.
•
Screw driver flat blade 3mm wide
•
PT100 resistance tables
•
Current meter (user trim)
To re-range the temperature scale follow the following instructions:-
•
Refer to figure 3, connect resistance box to TX12 input terminals using three wire
connection. Connect output to a DC supply, observe polarity. Turn power on and
allow 1 minute warm up period.
•
Set calibrator to the equivalent resistance of the PT100 sensor, at required low
range temperature. If the program LED is on at this stage the input is out of range,
check resistance and connection.
•
Press and hold button > 2 seconds to enter menus, menu 1 will then be selected,
indicated by one flash every burst.
•
Whilst menu 1 is selected, press and hold button > 2 seconds to enter menu 1, at
which stage the program LED toggle on and off at a slow rate.
•
Allow ten seconds then single press button to store low range setting, the program
LED will now flash at a fast rate.
•
Set calibrator to the equivalent resistance of the pt100 sensor, at required high
range temperature and allow ten seconds.
•
Press button to store high range setting, the program LED will flicker for one
second before the transmitter returns to normal operation. The transmitter is now
re-ranged.
Menu 2 Burnout Selection (Timeout is 3 Seconds)
•
Refer to figure 3, Connect output to a DC supply, observe polarity. For this menu
the input can be connected or open circuit. Turn power on.
•
Press and hold button > 2 seconds to enter menus, menu 1 will then be selected,
indicated by one flash every burst.
•
Single press button to advance selection to menu 2, indicated by two flashes of
the program LED every burst.
•
Whilst menu 2 is selected, press and hold button > 2 seconds to enter menu 2, at
which stage the program LED will either toggle on and off at a slow indicating low
scale burnout or fast rate indicating upscale burnout.
•
To change burnout direction single press button. The Program LED toggle rate will
change to the other setting. Repeated single presses will toggle between up and
down scale.
•
To store setting allow 3 seconds with no button action, the program will then
timeout, store new setting then return to normal operation.
Menu 3 User trim (Timeout is 20 Seconds)
This menu allows the user to trim the output current at 4 mA and 20 mA points,
(similar function to trim potentiometers) and is very useful for trimming out sensor
errors.
The input of the transmitter must be connected to either a calibrator or
temperature sensor held at a known temperature. The (4 to 20) mA loop current
also need to be monitored with a current meter.
•
Refer to figure 3, connect sensor or resistance box to TX12 input terminals using
three wire connection. Connect output to a DC supply, observe polarity, connect
current meter in series with loop. Turn power on and allow 1 minute warm period.
•
Set calibrator to the equivalent resistance of the PT100 sensor, at required
point. Alternatively ensure sensor temperature is at the required calibration point.
•
The transmitter will automatically trim the 4 mA end if the output is within the active
band of (3.8 to 6) mA, and trim the 20 mA end if the output is within the active
band of (18 to 21.5) mA. No setting adjustment is performed if the output current
not within these two bands. Ensure your calibration points are within these bands.
•
Press and hold button > 2 seconds to enter menus, menu 1 will then be selected,
indicated by one flash every burst.
•
Single press button to advance selection to menu 2, and single press again
select menu 3 indicated by three flashes of the program LED every burst.
•
Whilst menu 3 is selected, press and hold button > 2 seconds to enter menu 3,
which stage the program LED toggle on and off at either a slow rate indicating
downward trim direction or fast rate indicating upwards trim direction.
•
To change trim direction double press button. The Program LED toggle rate
toggle to the opposite direction. Repeated double presses will toggle between
and down trim direction
•
To trim output current, single press button to advance current 2 uA in set direction,
or press and hold button to auto advance in set direction release button to stop
advance. Note after approximately 20 seconds of continuous button press,
auto trim rate will speed up. Monitor the current change on the current meter.
•
To store new setting allow 20 seconds with no button action, the program will then
timeout, store new setting then return to normal operation.
Reset to factory default settings
If required the SEM203P can be reset to factory default setting, this procedure also
removes any user trim adjustment. Factory default settings are :
Range
(0 to 100) °C
Burnout
up-scale
User trim
All user adjustment cleared
To reset to factory setting, hold the button down whilst the TX12 is powered up.
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