BEKA BA527C, Руководство пользователя

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Step 5 Position dummy decimal point
Select 'd.P' from the main menu and
then press
P . Using the Up and Down
push-buttons position the dummy
decimal point in front of the least
significant digit.
Press
E to return to the main menu.
Step 6 Calibrate display
With any input current between 4 and
20mA select 'SEt' from the main menu
and press
P . The indicator will display
'ZErO' in the sub-menu, press P to
reveal the existing zero display. Using
the
Up , Down and P push-buttons
enter the required zero display of
-50.0
Press
E to return to the 'ZErO' prompt.
With any input current between 4 and
20mA press the Up push-button and
the indicator will display 'SPAn'. Press
P to reveal the existing span display.
Using the Up , Down and P push-
buttons enter the required span
display of 1050.0 Press
E to return to
the 'SPAn' prompt.
Press
E again to return to the main
menu.
Step 7 Return to display mode
Return to the display mode by
pressing
'E' .
7. Maintenance
7.1 Fault finding during commissioning
If a BA527C or BA528C fails to function during
commissioning the following procedure should be
followed:
Symptom Cause Solution
No display Incorrect There should be 1V
wiring between terminals 1 &
3 with terminal 1
positive.
No display, Incorrect Check that a current
and 0V wiring or is flowing in the loop.
between no power
terminals supply.
1 and 3.
Insufficient Check supply voltage
loop voltage and voltage drops
to operate caused by all
indicator components in the loop.
Indicator Positive The indicator has been
displays 1 over-range incorrectly calibrated &
is trying to display a
number greater than
19999.
Indicator Negative The indicator has been
displays –1 0ver-range incorrectly calibrated &
is trying to display a
number less than
-19999.
Unstable 4/20mA input Check loop supply
display has a large voltage.
ripple content.
Unable to Incorrect Enter correct security
enter the security code or fit security
programme code link in override position.
mode entered. See Fig 7.
7.2 Fault finding after commissioning
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
If a BA527C or BA528C fails after it has been
functioning correctly, the following procedure
should be followed: