PR electronics PREASY 422 Bedienungsanleitung Seite 23

Signal and sensor error info via display front 4501
Sensor error (see limits in the table) is displayed as SE.BR (sensor break) or
SE.SH (sensor short). Signals outside the selected range (not sensor error,
see table for limits) are displayed as IN.LO indicating low input signal or IN.HI
indicating high input signal. The error indication is displayed in line 3 as text
and at the same time the backlight flashes. Line 4 of the display is a status line
which displays COM (flashing bullet) indicating correct functioning of 4501 and
arrow up/down which indicates tendency readout of the input signal.
Signal and sensor error indication without display front
Status of the unit can also be read from the green LED in the front of the module.
Green flashing LED 13 Hz indicates normal operation.
Green flashing LED 1 Hz indicates sensor error.
Steady green LED indicates internal error.
Advanced functions
The unit gives access to a number of advanced functions which can be reached
by answering "Yes" to the point "adv.set".
Display setup: Here you can adjust the brightness contrast and the backlight.
Setup of TAG numbers with 6 alphanumerics. Selection of readout in line 3 of
the display. This line can either show the digital output or the TAG number.
Two-point process calibration: The unit can be process-calibrated in 2 points to
fit a given input signal . A low input signal (not necessarily 0%) is applied and
the actual value is entered. Then a high signal (not necessarily 100%) is applied
and the actual value is entered. If you accept to use the calibration, the unit will
work according to this new adjustment. If you later reject this menu point or
choose another type of input signal the unit will return to factory calibration.
Process simulation function: If you say "Yes" to the point "EN.SIM" it is possible
to simulate an input signal by means of the arrow keys and thus control the
output signal up and down. When you finalise the point with
to normal mode.
Password: Here you can choose a password between 0000 and 9999 in order to
protect the unit against unauthorised modifications to the configuration. The unit
is delivered default without password. If you have locked the unit with a password
by mistake, you can always open the menu by using the master password 2008.
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Language: In the menu "lang.setup" you can choose between 7 different
language versions of help texts that will appear in the menu. You can choose
between UK, DE, FR, IT, ES, SE and DK.
Auto diagnosis
The unit performs an advanced auto diagnosis of the internal circuits.
The following possible errors can be displayed in the front unit 4501.
CJ.ER - CJC sensor defect or CJC temperature outside range
FL.ER - Flash error
NO.CO - Connection error
IN.ER - Error levels on input
TY.ER - Configuration in 4501 does not match this product type
Selection of units
After choosing the input signal type you can choose the process units which
will be shown in the display (see table). By selection of temperature input the
process value is always displayed in Celsius or Fahrenheit. This is selected in
the menu point after selection of temperature input.
, the unit returns
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