BEKA BA524D Manual Download Page 9

5.7  Conditioning sub-menu:   Cond

This sub-menu allows the mains (line) frequency at
which the indicator has maximum ac rejection to be
selected and the two internal references to be
calibrated.  These functions are contained in a
sub-menu to minimise the possibility of inadvertent
adjustment.  To gain access to the sub-menu
select 'Cond'  from the main menu and press 

P

.

The indicator will display 'SurE' to warn that
changing the parameters in the sub-menu will
change the indicator display.  Pressing

 P

 again will

give access to the sub-menu, or pressing

 E 

will

return the indicator to the main menu.

5.7.1  AC rejection:   FrE

Caution

If the mains filter frequency is
changed, the indicator display and
internal references (if used) must be
recalibrated.

To provide maximum low frequency rejection the
internal digital filter may be set to operate at 50 or
60Hz to correspond with the local mains (line)
frequency.   To change the frequency select 'FrE'
from the 'Cond' sub-menu and press 

P

 which will

reveal the current setting.  The setting can be
changed by pressing the 

Up

 or 

Down

 buttons

followed by the 

E

 button to return to the sub-menu.

5.7.2  Calibration of internal references:  rEF

The indicator contains two references representing
4 and 20mA.  These references are used in the
'SEt' function which enables the indicator display to
be calibrated without an external current calibrator.
They are also used in the 'C--P' function when the

push-button is programmed to display the input

current in the display mode.   If neither of these
functions is to be used, it is not necessary to
calibrate the internal references.

To calibrate the references select 'rEF' from the
sub-menu and press 

P

  which will result in a

'0.004A' prompt being displayed. Adjust the
external current calibrator to 4.000mA  and again
press 

.  The indicator will display 'Ent' when the

4mA reference has been updated and will then
return to the '.004A' prompt.

To re-calibrate the 20mA internal reference, press
the 

Up

 button which will cause the indicator to

display '.020A'. Adjust the external current
calibrator to 20.000mA  and again press 

P . 

The

indicator will display 'Ent' when the 20mA reference
has been updated and will then return to the '.020A'
prompt.  Two operations of the 

E

 button will return

the indicator to the main menu.

The accuracy of the internal references, and hence
the display accuracy when using the SEt function,  
will  depend upon the accuracy of the external
current source.   With a maximum span of 19999
the indicators have a display resolution of 0.8µA,
we therefore recommend that the accuracy of the
external current source used for calibration is
greater than 0.4µA.

5.8  Function of the 

P

 push-button:   C - - P

This parameter defines the function of the 

P

 push-

button when the indicator is in the display mode.   
While the button is operated the indicator will
display the input current in milliamps or as a
percentage of the span.  

To check or change the parameter select 'C - -P'
from the main menu and press 

P

 to reveal the

current setting.  Pressing the 

Up

 or 

Down

 button

will toggle the setting between '4-20' the current
display and 'PC' the percentage display.  When set
as required press 

E

 to return to the main menu.   

Accuracy of the current display depends upon the
accuracy of the internal references which should be
periodically calibrated - see section  5.7.2

5.9  Security code:  COdE

The calibration and conditioning of the instrument
may be protected by a four digit security code
which must be entered before access to the
programme menu is granted.   New instruments
are programmed with the default security code
0000 which allows unrestricted access to all
programming functions. 

To enter a new security code select 'COdE' from
the menu and press

 P

  which will cause the indica-

tor to display the current security code.  Each digit
of the code can be changed using the 

Up

 and

Down

 push-buttons, and the 

P

 button to move to

the next digit.  When the required code has been
entered press

  E

 to return to the main menu. The

revised security code will be activated when the
indicator is returned to the operating mode.

If the security code is lost, access to the program-
mable functions can be obtained by moving the
internal security link to the override position.   The
security code can then be viewed by selecting
'CodE' from the main menu and pressing

 P

.

9

Summary of Contents for BA524D

Page 1: ...BA524D loop powered 4 digit field mounting indicator Issue 4 3rd December 2003...

Page 2: ...7 Maintenance 7 1 Fault finding during commissioning 7 2 Fault finding after commissioning 7 3 Servicing 7 4 Routine maintenance 7 5 Guarantee 7 6 Customer comments 8 Accessories 8 1 Units of measurem...

Page 3: ...l converter Fig 1 Simplified block diagram of BA524D Each time a 4 20mA current is applied to the instrument initialisation is performed After a short delay the following display sequence occurs 1 8 8...

Page 4: ...tput is greater than the sum of voltage drops introduced by the BA524D and the cable resistance Fig 3 Remote indication 4 INSTALLATION 4 1 Location The BA524D indicator is housed in a robust IP66 glas...

Page 5: ...ll the required glands conduit fittings or blanking plugs Note the temporary dust seals do not provide IP66 protection d Connect the field wiring to the terminals as shown in Fig 5 e Replace the instr...

Page 6: ...parameter root to be displayed If an incor rect code is entered the indicator will return to the display mode Once within the menu the required parameter can be reached by scrolling through the main...

Page 7: ...ction 50 or 60Hz may be selected This function must be set before the instrument is calibrated as it affects the indicator display See section 5 7 1 rEF Calibration of internal references The instrume...

Page 8: ...have been adjusted press E to enter the new zero The indicator will display Ent for a few seconds while the information is being stored in memory and will then return to the ZErO prompt To adjust the...

Page 9: ...tor to 20 000mA and again press P The indicator will display Ent when the 20mA reference has been updated and will then return to the 020A prompt Two operations of the E button will return the indicat...

Page 10: ...10...

Page 11: ...display the input current as a percentage of span when the P push button is operated Step 1 Connect indicator to calibrator Connect the indicator to an accurate external current source Terminal 1 posi...

Page 12: ...erences As in 7 1 the BA524D is required to display 50 0 with a 4mA input 1050 0 with a 20mA input from a linear transducer Maximum display resolution is required the frequency of the mains supply is...

Page 13: ...ng completion of calibration return to the display mode by pressing E 7 MAINTENANCE 7 1 Fault finding during commissioning If a BA524D fails to function during commissioning the following procedure sh...

Page 14: ...s also unscrew the two C screws securing the buttons and un plug the five way connector Finally unscrew all four D screws identified in Fig 4 and carefully lift off the front of the instrument The ins...

Page 15: ...hanumeric characters 10mm high or 1 row of 11 alphanumeric characters 7mm high or 2 rows of 18 alphanumeric characters 5mm high 8 2 Alarms The BA524D can be supplied with two solid state single pole a...

Page 16: ...Alarm enable Enables or disables the alarm function without changing the alarm parameters See section 8 2 3 SP1 Alarm setpoint 1 Adjusts the alarm setpoint The alarm is activated when the indicator d...

Page 17: ...arm may be positioned anywhere between 19999 and 19999 providing this corresponds to an input current between 3 8 and 20 2mA e g If the indicator has been calibrated to display 0 with 4mA input and 10...

Page 18: ...et at 9000 and hysteresis of 200 will perform as follows High alarm will be activated when display equals or exceeds 9000 but will not reset until the display falls below 8800 8 2 8 Alarm delay dELA T...

Page 19: ...urity code allowing direct access to the setpoints by pressing the P and Up buttons simultaneously New instruments with alarms are supplied with this function disabled and the security code set to 000...

Page 20: ...lumetric units by filling the tank with known incremental volumes and calibrating the indicator to display the sum of the increments at each break point The number of break points required should firs...

Page 21: ...21...

Page 22: ...oint occurs Enables the required current at each break point to be defined without having to input an accurate input current to the indicator diSP Defines display at break point Enables the indicator...

Page 23: ...ayed 8 5 Display backlight The BA524D can be supplied with LED backlighting to improve display contrast when the indicator is installed in poorly illuminated areas The backlight is electrically isolat...

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