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19

8.3.2  Programming and adjustment

When a BA538C is supplied with alarms the main
programme menu is extended as shown in Fig 10.
The two alarm functions appear between the
'LOC-rSEt' and the 'CLr.Gtot' functions.  Each
alarm may be programmed as a rate or as a total
alarm.

For simplicity Fig 10 only shows the
programmable functions on the rate option of
alarm AL1.   Alarm 2 and the total options are
identical except that the total alarms do not have
hysteresis.

The following table summarises each of the alarm
programme functions and includes a cross
reference to more detailed information.   Again
only the functions on alarm AL1 are listed.

Summary of programmable alarm functions

   

Display      Description of function

'EnbL'

Alarm enable

Enables or disables the alarm function
without changing the alarm
parameters.
See section  8.3.3

'tYPE'

Type of alarm

Defines whether the alarm operates on
the rate or total display.
See section 8.3.4

'SPr1'

Alarm setpoint 1

   or

Adjusts the alarm setpoint.  The

‘SPt1’

 

alarm is activated when the rate or

 

total display equals the setpoint.

Note:

 ‘SPr1’ is displayed for a rate

alarm and ‘SPt1’ for a total alarm.
See section 8.3.5

'HI.LO'

Alarm function

Defines whether the alarm has a high
or low function
See section 8.3.6

'no.nc'

Normally open or normally closed
output

Determines whether the single pole
alarm output is open or closed in the
non-alarm condition.
See section 8.3.7

  

'HStr'

Hysteresis

Adjusts the alarm hysteresis.  Only
available on rate alarms.
See section 8.3.8

'dELA'

Alarm delay

 

time

Adjusts the delay between the display
equalling the setpoint and the alarm
output being activated.
See section 8.3.9

'SIL'

Alarm silence time

Defines the time that the alarm output
remains in the non-alarm condition
following acceptance of an alarm.
See section 8.3.10

'AcSP'

Access setpoint

Sub-menu that enables direct access
to the alarm setpoints from the display
mode and defines a separate security
code.
See section  8.3.11

Summary of Contents for BA538C

Page 1: ...ssue 12 25th March 2014 Label information Rate display Annunciators for optional alarms Rotating flow indicator Total display BA538C Externally powered pulse input panel mounting rate totaliser issue 12 ...

Page 2: ...otal 5 15 Security code 6 Calibration Example 6 1 Calibration procedure 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 Scale card 8 2 Tag number 8 3 Alarms 8 3 1 Solid state output 8 3 2 Programming and adjustment 8 3 3 Alarm enable 8 3 4 Type of alarm 8 3 5 Setpo...

Page 3: ...unction on the rate or total displays further extend the instrument s applications Fig 1 Simplified block diagram of BA538C 2 1 Initialisation Each time power is applied to the instrument initialisation is performed After a short delay the following display sequence occurs All segments of the display are activated for about 2 seconds The product firmware number and the version number are displayed...

Page 4: ...et Activated when the instrument Annunciator is being reset 3 SYSTEM DESIGN 3 1 Flow transmitter loops The BA538C may be connected to almost any pulse output flowmeter and calibrated to display rate of flow and total flow in the same or different engineering units Fig 2 illustrates the basic circuit that is used for all BA538C installations For simplicity connections for the optional pulse output ...

Page 5: ...y be used as an inhibit function There is no practical limit on the distance that the reset switch may be from the totaliser Alternatively the BA538C may be programmed so that the total display is reset to zero when the Up and Down push buttons are operated simultaneously for more than two seconds see 5 12 4 INSTALLATION 4 1 Location The BA538C is housed in a robust aluminium enclosure with a poly...

Page 6: ...closure and the panel c Connect the panel wiring to the rear terminal block s as shown in Fig 4 To simplify installation the terminals are removable so that panel wiring can be completed before the instrument is installed Fig 4 Installation and terminal connections 4 3 EMC The BA538C complies with the requirements of the European EMC Directive 2004 108 EEC For specified immunity all wiring should ...

Page 7: ...l decimal points Moving the position of a decimal point in a scale factor will therefore affect the instrument calibration The BA538C updates its total flow calculation twice per second If the instrument is used for batching applications this resolution may define the accuracy of the system Note The total and rate displays may be updated less frequently depending upon the display update time selec...

Page 8: ...8 ...

Page 9: ...LAY 2 Lower display Turns the lower display which normally shows rate on or off See section 5 7 Display Description of function SCALE r Rate Scale Factor Defines the arithmetic relationship between the pulse input frequency and the rate display May be adjusted between 0 001 and 99999999 When used with a flowmeter SCALE r should be set to the flowmeter K factor pulses per unit of measurement if the...

Page 10: ... current input type Pressing Up or Down will scroll through the five options UOLts Voltage pulse input Threshold 1V and 3V 5kHz max Input terminals 3 and 4 COIL Low voltage pulse Threshold 20mV peak 5kHz max Input terminals 3 and 4 Pr dEt NAMUR proximity detector Threshold 1 2 and 2 1mA 5kHz max Input terminals 5 and 6 COntACt Switch contact Threshold 100 and 1000 100Hz max Input terminals 5 and 6...

Page 11: ...te display by 1 60 or 3 600 depending upon whether the BA538C is required to display rate per second per minute or per hour See Fig 5 To check or change the timebase select t bASE from the main menu and press P which will reveal the current setting Pressing the Up or Down button will index through the three options tb 1 for flow second tb 60 for flow minute tb 3600 for flow hour Select the require...

Page 12: ... rates that over long periods may result in significant totalisation errors the BA538C may be programmed to stop totalising when the flow rate falls below an adjustable threshold To check or change the clip off threshold select CLIP OFF from the main menu and press P which will reveal the current setting The threshold is shown in the units already selected for the flow rate display One digit will ...

Page 13: ...re 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 without entering a security code To enter a new security code select COdE from the menu and press P which will cause the instrument to display the current security code Each digit of the code can be changed using the Up and Down...

Page 14: ...p or Down button scroll through the main menu until InPut is displayed then press P to reveal the existing setting Select COIL the input for a magnetic pick off using the Up or Down button and return to the InPut prompt in the main menu by pressing E Note The BA538C has two pairs of input terminals 3 4 for voltage inputs and 5 6 for switch contact proximity detector or open collector inputs Ensure...

Page 15: ... metre for every 1 050 x 1 000 pulses received SCALE t should therefore be set to 1 050 000 Select SCALE t from the main menu and press P which will reveal the current setting with one digit flashing To position the decimal point operate the P push button to move the flashing digit to the least significant position Pressing the Up and Down buttons simultaneously will then remove the decimal point ...

Page 16: ...strument to the CLr Gtot prompt in the main menu Step 12 Define the security code Defining a security code prevents unauthorised access to the programme functions Select COdE from the main menu and press P which will reveal the existing security code Using the Up and Down buttons enter the new code 1209 digit by digit The P button will transfer control between digits When the new code has been ent...

Page 17: ...ation Alarms do not function Alarms have been disabled following calibration change Re enable both alarms 7 2 Fault finding after commissioning ENSURE PLANT SAFETY BEFORE STARTING MAINTENANCE If a BA538C fails after it has been functioning correctly the following table may help to identify the cause of the failure Symptom Cause Check No display No power supply That there is between 10 and 30Von te...

Page 18: ...ons such as a shut down system When the BA538C power supply is turned off or disconnected both BA538C alarm outputs will open irrespective of whether normally open or normally closed outputs have been selected When designing a system an open output should therefore be the alarm condition Alarm annunciators on the instrument display indicate the status of both alarms If an alarm delay or silence ti...

Page 19: ...rm operates on the rate or total display See section 8 3 4 SPr1 Alarm setpoint 1 or Adjusts the alarm setpoint The SPt1 alarm is activated when the rate or total display equals the setpoint Note SPr1 is displayed for a rate alarm and SPt1 for a total alarm See section 8 3 5 HI LO Alarm function Defines whether the alarm has a high or low function See section 8 3 6 no nc Normally open or normally c...

Page 20: ...ed or the alarm type has been changed Both alarms must therefore be enabled after calibration changes 8 3 4 Type of alarm tYPE Alarm 1 and Alarm 2 may both be rate or total alarms or one may be conditioned for rate and the other for total To check or change the type of alarm select tYPE from the alarm menu and press P which will reveal the current setting The function can be changed by pressing th...

Page 21: ...eresis select HStr from the alarm menu and press P which will reveal the existing figure Each digit can be adjusted using the Up and Down push buttons and the P button to move to the next digit When the required hysteresis has been entered press E to return to the alarm menu e g A BA538C calibrated to display a flow of 0 to 5000 with a high alarm set at 4000 and hysteresis of 100 will perform as f...

Page 22: ...to the setpoints in the display mode by pressing the P and Up buttons simultaneously New instruments with alarms are supplied with the security code set to 0000 8 3 12 Adjusting alarm setpoints from the display mode Access to the two alarm setpoints from the instrument display mode is obtained by operating the P and Up push buttons simultaneously as shown in Fig 11 If the setpoints are not protect...

Page 23: ...g 12 Display backlight 8 5 Pulse output The BA538C may be supplied with an opto isolated solid state pulse output The output is a polarised current sink that closes for a programmable duration each time the least significant digit of the BA538C display changes A programmable divider enables the pulse output frequency to be divided by 10 100 1 000 or 10 000 See Fig 13 The output pulse is not synchr...

Page 24: ...isplay corresponding to an output current of 4 000mA Pressing P will reveal the existing setting with the most significant digit flashing The decimal point will be fixed in the position already defined for the rate display by the d P function The value of the flashing digit may be changed by pressing the Up or Down buttons When this digit is set as required pressing P will transfer control to the ...

Page 25: ...output are powered from separate supplies the 4 20mA output current will continue to flow when the BA538C supply fails or is turned off Powering both from a common supply as shown in Fig 15 eliminates this effect Fig 16 4 20mA output programme structure ...

Page 26: ...5 4 dISPLAY 2 5 7 d P 5 6 EnbL 8 3 2 8 3 3 Fault finding during commissioning 7 1 after commissioning 7 2 FILtEr 5 10 Flow indicator 2 3 Grand total 2 3 clear 5 14 Guarantee 7 5 HI LO 8 3 2 8 3 6 HStr 8 3 2 8 3 8 InPut 5 5 Installation 4 2 Subject Section LOC rSEt 5 13 Local reset 5 13 Location 4 1 Maintenance 7 0 routine 7 4 no nc 8 3 2 8 3 7 Output Pulse 8 5 4 20mA 8 6 Push buttons Down 2 2 E 2 ...

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