BEKA BA368C Manual Download Page 81

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5.1 Description

5.1.1

Initialisation & loss of power

5.1.2

Controls

5.1.3

Displays

5.2

System certificates

5.3

Use with Zener barriers

5.3.1 Power

supply

5.3.2 Synchronisation
5.3.3 Optional

control

outputs

5.4

Use with galvanic isolators

5.4.1

Power supply

5.4.2

Synchronisation

5.4.3

Optional control outputs

5.5

Programming

5.5.1

Accessing programme
functions.

5.5.2

Function of instrument

5.5.3

Display format and units

5.5.4

Set display time

5.5.5

Set reset time

5.5.6

Security code

5.5.7

Control output enable

5.5.8

Setpoint times

5.5.9

Access setpoints

5.5.10

Adjusting control output
setpoints when displaying time.

5.6

Application

5.6.1

Calibration

5.7

Maintenance

5.7.1

Fault finding during
commissioning.

5.7.2

Fault finding after commissioning.

5.8

Index for Clock section

Section 5

Use as a clock

CONTENTS

Summary of Contents for BA368C

Page 1: ...ification information label Display Pulse input indicator Annunciators for optional alarms or control outputs Selectable second display BA368C Intrinsically safe externally powered panel mounting counter timer tachometer and clock issue 11 ...

Page 2: ...ne maintenance 1 7 2 Guarantee 1 8 Customer comments 1 9 Accessories 1 9 1 Scale card 1 9 2 Tag number 1 9 3 Optional control outputs alarm outputs 1 9 3 1 Solid state output 1 9 3 2 Intrinsic safety 1 9 4 Optional pulse output 1 9 4 1 Intrinsic safety 1 9 5 Optional 4 20mA output 1 9 5 1 Intrinsic safety 1 9 6 Optional display backlight Appendix 1 FM Approval for use in the USA 2 Use as a Counter...

Page 3: ...include a pulse output 4 20mA analogue output and two solid state control outputs Fig 1 1 Simplified block diagram of BA368C 1 2 1 Counter When configured as a counter the BA368C will accept pulses on one or both inputs and may be programmed to display Input A Input B Input A Input B Input A direction controlled by input B Input A and Input B quadrature input for position sensing Optional alarms a...

Page 4: ...allation outside the UK the local Code of Practice should be consulted 1 4 2 Power supply When installed in a hazardous area the BA368C must be powered via a Zener barrier or galvanic isolator from a dc supply located in the safe area The input safety parameter for terminals 1 and 2 are Ui 28V dc Ii 100mA dc Pi 0 7W Any certified Zener barrier or galvanic isolator with output safety parameters wit...

Page 5: ... relay is required to transfer the contact closure into the hazardous area Almost any intrinsically safe relay with certification permitting the contacts to be connected to equipment in the hazardous area may be used A positive diode return Zener barrier may also be used The system certificates list suitable devices and define the maximum cable parameters 1 4 5 Zones gas groups and T rating The BA...

Page 6: ...s maximum contrast when viewed from directly ahead and slightly below the centre line of the instrument For reflective displays there is little degradation when viewed from above the centre line but slight degradation may be noticeable when the instrument is fitted with a backlight Fig 1 2 BA368C dimensions 1 5 2 Installation Procedure a Insert the BA368C into the instrument panel cut out from the...

Page 7: ...l block s by gently pulling Remove the six screws securing the rear panel and lift off the panel which will reveal the link see Fig 1 4 Fig 1 4 Location of security override link 1 7 SERVICING A fault finding guide is contained in each section of this manual If this does not reveal the cause of the problem our sales department will be pleased to help you Faulty BA368C instruments should be returne...

Page 8: ...ystem When the BA368C power supply is turned off or disconnected both control outputs will open irrespective of how they have been programmed Annunciators on the instrument display indicate the status of both control outputs 1 9 3 1 Solid state output Each output is a galvanically isolated single pole solid state switch as shown in Fig 1 5 The outputs are polarised and current will only flow in on...

Page 9: ... supplied with an optically isolated 4 20mA current sink which may be used when the instrument is programmed as a counter or as a tachometer When the BA368C is programmed as a counter the 4 20mA output may be proportional to pulse input rate or the total number of pulses When programmed as a tachometer the current is proportional to rotational speed Note The 4 20mA current output is not available ...

Page 10: ...rrier or a galvanic isolator as shown in Fig 1 6 Any certified Zener barrier may be used providing the output parameters do not exceed Uo 28V Io 159mA Po 0 8W The system certificate lists some of the galvanic isolators which may be used The maximum equivalent capacitance and inductance at the backlight terminals is Ci 40nF Li 30µH To determine the maximum permissible cable parameters these figures...

Page 11: ...he following gases Intrinsic Safety Division 1 or 2 Class I Group A B Group C Group D Zone 0 1 or 2 Class 1 Group IIC Group IIB Group IIA The FM entity parameters are similar to the ATEX parameters The intrinsically safe circuits shown in this manual may therefore be used for installations in the USA providing the Zener barriers and galvanic isolators are FM Approved and comply with BEKA associate...

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Page 21: ...te scale factor 2 5 10 Rate display filter 2 5 11 Timebase 2 5 12 Direction of count 2 5 13 Reset value 2 5 14 Local reset 2 5 15 Resetting grand total 2 5 16 Security code 2 6 Optional Alarms 2 6 1 Programming and adjustment 2 6 2 Alarm enable 2 6 3 Type of alarm 2 6 4 Setpoint adjustment 2 6 5 Alarm function 2 6 6 Alarm output status 2 6 7 Hysteresis 2 6 8 Alarm delay 2 6 9 Alarm silence time 2 ...

Page 22: ...rmanent memory If during operation the power supply is interrupted all programme parameters the displayed total and the grand total will be stored in permanent memory 2 1 2 Controls The BA368C counter is controlled and calibrated via four front panel push button switches In the display mode i e when the instrument is counting the switch functions are Description of Switch Functions E Down While th...

Page 23: ...meters of the terminals to which they are connected Only one polarity of Zener barrier i e positive or negative may be used with each instrument To assist with system design the Zener barrier system certificate specifies the maximum output parameters of the Zener barriers that may be connected to the BA368C and defines the maximum cable parameters Diode return barriers are identified by manufactur...

Page 24: ... safe area Any switch may be used but a Zener barrier is required to transfer the contact closure into the hazardous area A diode return barrier may be combined with the supply barrier so that only one dual channel device is required The system certificate lists some of devices that may be used Fig 2 1 illustrates how the BA368C counter total display may be reset from both the safe and the hazardo...

Page 25: ...y be directly connected to the input terminals If the BA368C is located in a hazardous area but the transducers are in the safe area a galvanic isolator is required to transfer the transducer output s to the instrument The system certificate defines some of the devices which may be used 2 4 3 Resetting the total display When terminals 7 8 are connected together the total display will be reset To a...

Page 26: ...alogue output and the re transmitted pulse output When read in conjunction with Fig 2 3 it provides a quick aid for programming the instrument If more detail is required each section contains a reference to a full description of the function Programming details for the optional alarms analogue 4 20mA output and the re transmitted pulse output are contained in sections 2 6 2 7 and 2 8 SUMMARY Displ...

Page 27: ...r pulses at inputs A and B increment or decrement the total display See section 2 5 12 Display Description of function rSET UAL Reset value Defines a pre set number to which the display will be set when the BA368C is locally or remotely reset Allows the instrument to count down from a preset number See section 2 5 13 LOC rSEt Local reset of total display When turned On the total display may be res...

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Page 29: ...e select InPut A from the menu and press P which will reveal the current input type Pressing the Up or Down button will scroll through the five options UOLts Voltage input Threshold 1V and 3V 5kHz max COIL Low voltage Threshold 20mV peak 5kHz max Pr dEt NAMUR proximity detector Threshold 1 2 and 2 1mA 5kHz max COntACt Switch contact Threshold 100 and 1000Ω 100Hz max OP COL Open collector Threshold...

Page 30: ...ontrol to the lower display When the decimal point s have been positioned as required press E to return to the main menu Note It is only necessary to position the decimal point in the lower display if it is activated see 2 5 7 or a rate alarm or a 4 20mA rate output is required 2 5 7 Lower display dISPLAY 2 This function turns the lower rate display on or off When turned off the BA368C will displa...

Page 31: ... 5 The second digit defines the deviation from the displayed rate at which the filter will be overridden and the rate display will move rapidly to the new value Second digit Magnitude of step change which will produce a rapid response X0 Off X1 1 X2 2 X3 4 X4 8 X5 12 X6 16 X7 24 X8 32 X9 64 By careful adjustment of the two parameters a stable display with an acceptable step input response can be o...

Page 32: ... See Figs 2 1 and 2 2 2 5 15 Resetting grand total CLr Gtot The grand total is a separate eight digit counter which duplicates the total display but is not cleared when the total display is reset The grand total may be viewed when the instrument is in the display mode by operating the E and Down push buttons simultaneously The grand total can only be reset to zero from the CLr Gtot function in the...

Page 33: ...ate on the total or the rate display See section 2 6 3 SPt1 Alarm setpoint 1 or SPr1 Adjusts the alarm setpoint The alarm is activated when the display equals the setpoint See section 2 6 4 HI LO Alarm function Defines whether the alarm has a high or low function See section 2 6 5 no nc Normally open or normally closed output Determines whether the single pole alarm output is open or closed in the...

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Page 35: ... return to the alarm menu 2 6 6 Alarm output status no nc The alarm output may be open or closed in the non alarm condition When the BA368C power supply is turned off or disconnected both the alarm outputs will open irrespective of whether normally open or normally closed outputs have been selected Therefore an open output should be the alarm condition for fail safe operation To check the alarm ou...

Page 36: ...ts from the display mode Return to the AcSP prompt in the main menu by pressing E twice If On is selected the operator will have direct access to the alarm setpoints from the display mode via a separate optional security code To define this four digit numeric code press E to return to the EnbL prompt followed by the Up or Down button to select the access code prompt AcCd Pressing P will then revea...

Page 37: ...tons simultaneously Using the Up or Down push button select the function 4 20 OP and press P which will result in the BA368C displaying the first sub menu function 4 000 See Fig 2 6 Using the Up or Down push button select the 4 20 tYPE function which enables the 4 20mA output to be controlled by the total or rate display Press P select the required source and then return to the sub menu by pressin...

Page 38: ...ic safety 2 8 1 Programming and adjustment The main counter programme menu is extended as shown in Fig 2 7 to accommodate the re transmitted pulse output calibration functions How frequently a pulse is generated is defined by the diUidE function When set to 1 an output pulse will be generated each time the least significant digit of the total display is incremented This may be reduced in multiples...

Page 39: ...git enter the pass word SurE Note S is entered as 5 Finally press E which will execute the function change and return the instrument to the FunctIon prompt in the main menu Step 3 Select the type of inputs Using the Up or Down button scroll through the main menu until InPut A is displayed press P to reveal the existing setting Using the Up or Down buttons select Pr dEt the input for a 2 wire proxi...

Page 40: ...ch will show the current figure with one digit flashing To position the decimal point operate the P push button to move the flashing digit to the second least significant digit Pressing the Up and Down buttons simultaneously will then fix the decimal point in front of the least significant digit Using the Up and Down buttons to adjust each digit in turn and the P button to transfer control between...

Page 41: ...14 Turn local reset off In this example the operator must not be able to zero the total position display from the instrument front panel The local reset function should therefore be turned off Select LOC rSEt from the main menu and press P which will reveal if it is turned On or OFF Using the Up or Down button toggle the display to OFF and press E to return to the LOC rSEt prompt Step 15 Define th...

Page 42: ...uts 4 20mA output is constant 3 5mA Counter parameters have been changed Programming of 4 20mA output see 2 7 1 Re transmitted pulse output not working Incorrect programming Counter is programmed for A b input see 2 5 4 2 10 2 Fault finding after commissioning ENSURE PLANT SAFETY BEFORE STARTING MAINTENANCE Live maintenance is permitted on intrinsically safe equipment installed in a hazardous area...

Page 43: ...te 2 5 7 Resetting total 2 3 3 2 4 3 2 5 14 Function of instrument 2 5 2 Grand total 2 1 2 1 3 Resetting 2 5 15 Guarantee 1 7 2 Galvanic isolator use with 2 4 Input 2 3 2 2 4 2 2 5 3 Installation 1 5 Location 1 5 1 Maintenance 2 10 Routine 1 7 1 Power supply 2 3 1 2 4 1 Pulse output optional 2 8 Intrinsic safety 1 9 4 1 Programming adjustment 2 8 1 Fig 2 7 Subject Section Rate Display filter 2 5 1...

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Page 45: ... of input 3 5 4 Start and stop 3 5 5 Units of display 3 5 6 Set time 3 5 7 Access set time setpoint 3 5 8 Direction of count 3 5 9 Lower display set time 3 5 10 Continue cycle 3 5 11 Local reset of timer 3 5 12 Resetting elapsed time grand total 3 5 13 Security code 3 6 Optional Control Outputs 3 6 1 Programming and adjustment 3 6 2 Control output enable 3 6 3 Control output on at 3 6 4 Control ou...

Page 46: ...t memory 3 1 2 Controls The BA368C timer is controlled and calibrated via four front panel push button switches In the display mode i e when the instrument is displaying time the switch functions are Description of Switch Functions Down When enabled starts the timer See section 3 5 4 Up When enabled stops the timer See section 3 5 4 Description of Switch Functions E Down While these buttons are pu...

Page 47: ...ositive or negative may be used with each instrument To assist with system design the Zener barrier system certificate specifies the maximum output parameters of the Zener barriers that may be connected to the BA368C and defines the maximum cable parameters Diode return barriers are identified by manufacturers type number although alternatives may be used The basic system used for all BA368C hazar...

Page 48: ...is required to transfer the contact closure into the hazardous area A diode return barrier may be combined with the supply barrier so that only one dual channel device is required The system certificate lists some of devices that may be used Fig 3 1 illustrates how the timer may be reset from both the safe and the hazardous areas 3 3 4 Options When the BA368C is calibrated as a timer optional cont...

Page 49: ...lly safe voltage may be directly connected to these two inputs If the BA368C is located in a hazardous area but the transducer s is in a safe area a galvanic isolator is required to transfer the transducer output to the instrument The system certificate defines some galvanic isolators which may be used 3 4 3 Resetting the timer When terminals 7 8 are connected together the timer will be reset to z...

Page 50: ...trol outputs When read in conjunction with Fig 3 3 it provides a quick aid for programming the instrument If more detail is required each section contains a reference to a full description of the function Programming details for the optional control outputs are contained in section 3 6 SUMMARY Display Description of function Function Function of instrument Enables the BA368C to be conditioned as a...

Page 51: ...oth control outputs will be returned to their status when power was removed After power restoration the timer will always return in the stopped condition See section 3 5 10 LOC rSEt Local reset When turned On the timer may be reset from the display mode by simultaneously operating the Up and Down push buttons for at least two seconds See section 3 5 11 CLr Gtot Resetting grand total time This func...

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Page 53: ...hreshold 1 2 and 2 1mA COntACt Switch contact Threshold 100 and 1000Ω OP COL Open collector Threshold 2kΩ and 10kΩ When the required type of input has been selected press E to enter the selection and return to the InPut A or InPut b prompt in the main menu Note To operate reliably the input signal must fall below the lower switching threshold and rise above the upper switching threshold 3 5 4 Star...

Page 54: ...the direct access menu is On or OFF The Up or Down buttons will toggle the display between the two conditions If OFF is selected the operator will not have access to the setpoint from the display mode Return to the AcSEt t prompt in the main menu by pressing E twice If On is selected the operator will have direct access to the set time setpoint from the display mode via a separate optional securit...

Page 55: ...viewed when the instrument is in the display mode by operating the E and Down push buttons simultaneously The grand total time can only be reset to zero from the CLr Gtot function in the main programme menu To zero the grand total select CLr Gtot and press P which will cause the instrument to display Clr no with no flashing Continuously press the Up or Down push buttons until CLr YES is displayed ...

Page 56: ...g 3 4 Control output sub menu 3 6 2 Control output enable EnbL This function allows the control output to be enabled or disabled without altering any other parameters To check or change the function select EnbL from the control output sub menu and press P which will reveal the current setting The function can be changed by pressing the Up or Down button followed by the E button to return to the co...

Page 57: ...unction is used the front panel control output annunciator will start flashing when the programmed switching condition occurs It will continue flashing until the delay time has expired when the control output will close and the annunciator will be continuously activated 3 7 APPLICATIONS The BA368C timer is a versatile instrument which can perform a wide variety of hazardous area timing application...

Page 58: ...dure should be followed Symptom Cause Check No display Incorrect wiring Note Terminals 2 4 6 8 are interconnected within the BA368C That there is between 10 and 28V on terminals 1 2 with terminal 1 positive Timing cycle will not start Elapsed or remaining time display not changing Incorrect programming or input wiring Timer is being permanently reset Stop input is activated That instrument has bee...

Page 59: ...f the failure Symptom Cause Check No display No power supply That there is between 10 and 28V on terminals 1 2 Timing cycle will not start Transducer or associated wiring has been damaged Timer is being permanently reset Stop input is activated Set time has expired but timer has not been reset Presence of signal at input terminals That reset terminals 7 8 are not connected together Input at termin...

Page 60: ... 3 3 3 3 4 3 3 5 11 Function of instrument 3 5 2 Grand total 3 1 Resetting 3 5 12 Guarantee 1 7 2 Galvanic isolator use with 3 4 Input 3 5 3 Installation 1 5 Location 1 5 1 Loss of power 3 5 10 Maintenance 3 8 Routine 1 7 1 Power supply 3 3 1 3 4 1 Subject Section Reset Grand total 3 5 12 Timer 3 3 3 3 4 3 3 5 11 Security Code 3 5 13 Override link 1 6 1 Servicing 1 7 Timer Direction 3 5 8 Resettin...

Page 61: ...imal point 4 5 5 Lower display 4 5 6 Rotational scale factor 4 5 7 Timebase 4 5 8 Display filter 4 5 9 Clip off 4 5 10 Local reset of run time display 4 5 11 Resetting run time grand total 4 5 12 Security code 4 6 Optional Alarms 4 6 1 Programming and adjustment 4 6 2 Alarm enable 4 6 3 Type of alarm 4 6 4 Setpoint adjustment 4 6 5 Alarm function 4 6 6 Alarm output status 4 6 7 Hysteresis 4 6 8 Al...

Page 62: ...programme menu See section 4 5 10 P Down While these buttons are pushed the instrument will display the firmware and version numbers plus the programmed function Note When optional alarms are fitted the BA368C may be programmed to provide direct access to the alarm setpoints from the display mode by operating the P Up push buttons See section 4 6 10 4 1 3 Displays The BA368C tachometer has two dig...

Page 63: ... usually about 26V 4 3 2 Input When the BA368C is programmed as a tachometer only input A is operational This input may be programmed to operate with almost any pulse output transducer The following table shows the switching thresholds for the various transducers plus the maximum operating frequency and the input terminal numbers For reliable counting the input signal must fall below the lower thr...

Page 64: ...designed If the run time display is not used or is reset from the instrument front panel only the power supply galvanic isolator is required Fig 4 2 Basic tachometer circuit using isolators 4 4 1 Power supply The BA368C galvanic isolator system certificate lists a wide range of certified galvanic isolators that may be used to power the instrument If using the entity concept to select an isolator i...

Page 65: ... See section 4 6 4 5 PROGRAMMING Throughout this manual push buttons are shown in italics e g P or Up push button and legends displayed by the instrument are shown within inverted commas e g SEt and dISPLAY 4 5 1 Accessing programme functions Access to the programme menu is obtained by operating the P and E push buttons simultaneously If the BA368C is not protected by a security code the first par...

Page 66: ... See section 4 5 6 t bASE Timebase Selectable multiplier to display rotational speed in revolutions per second per minute or per hour Select tb 1 for revs second tb 60 for revs minute tb 3600 for revs hour See section 4 5 7 Display Description of function FILtEr Display filter Adjustable digital filter to reduce noise on the speed display Adjustable between 0 and 99 See section 4 5 8 CLIP OFF Clip...

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Page 68: ...turn to the InPut A prompt in the main menu Note To count reliably the input signal must fall below the lower switching threshold and rise above the higher switching threshold 4 5 4 Position of the decimal point d P The BA368C speed display has six digits and the decimal point may be positioned between any of them or may be omitted To adjust the position of the decimal point select d P from the ma...

Page 69: ...dly to the new value Second digit Magnitude of step change which will produce a rapid response X0 Off X1 1 X2 2 X3 4 X4 8 X5 12 X6 16 X7 24 X8 32 X9 64 By careful adjustment of the two parameters a stable display with an acceptable step input response can be obtained for most applications During commissioning it is recommend that initially the second digit is set to 0 off and the first digit is ad...

Page 70: ...sh buttons simultaneously The grand total can only be reset to zero from the CLr Gtot function in the main programme menu To zero the grand total select CLr Gtot and press P which will cause the instrument to display Clr no with no flashing Continuously press the Up or Down push buttons until CLr YES is displayed and then press P which will result in a CLr 0000 prompt with one digit flashing Using...

Page 71: ...on 4 6 3 SPS1 Alarm setpoint 1 or SPh1 Adjusts the alarm setpoint The alarm is activated when the display equals the setpoint SPS1 is displayed when a speed alarm has been selected and SPh1 is displayed for a run time alarm See section 4 6 4 HI LO Alarm function Defines whether the alarm has a high or low function See section 4 6 5 no nc Normally open or normally closed output Determines whether t...

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Page 73: ... whether normally open or normally closed outputs have been selected Therefore an open output should be the alarm condition for fail safe operation To check the alarm output status select no nc from the alarm menu and press P to reveal the current setting The function can be changed by pressing the Up or Down button followed by the E button to return to the alarm menu 4 6 7 Hysteresis HStr Hystere...

Page 74: ...his four digit numeric code press E to return to the EnbL prompt followed by the Up or Down button to select the access code prompt AcCd Pressing P will then reveal the current security code with one digit flashing The code may be changed by operating the Up or Down push buttons and pressing the P button to transfer control to the next digit Finally press E twice to enter the new security code and...

Page 75: ...cted Using the Up or Down push button select the function 4 20 OP and press P which will result in the BA368C displaying 4 000 this is the prompt for setting the speed display 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 speed display by the ...

Page 76: ...scroll through the main menu until InPut is displayed press P to reveal the existing setting Using the Up or Down buttons select COIL the input for a magnetic pick off and then return to the InPut prompt in the main menu by pressing E Step 4 Position of decimal point In this example the BA368C is displaying rotary speed and no display decimal point is required Select d P from the main menu and pre...

Page 77: ... to transfer control between digits enter 5 Finally return to the CLIP OFF prompt in the main menu by pressing E Step 10 Turn local reset on In this example the operator is required to zero the run time display from the instrument front panel The local reset function should therefore be turned on Select LOC rSEt from the main menu and press P which will reveal if it is turned On or OFF Using the U...

Page 78: ...n override position See Fig 1 4 4 9 2 Fault finding after commissioning ENSURE PLANT SAFETY BEFORE STARTING MAINTENANCE Live maintenance is permitted on intrinsically safe equipment installed in a hazardous area but only certified test equipment should be used unless a gas clearance certificate is available If a BA368C tachometer fails after it has been functioning correctly the following table ma...

Page 79: ...ls 4 1 2 Decimal points 4 5 4 Display 4 1 3 Filter 4 5 8 Lower run time 4 5 5 Function of instrument 4 5 2 Guarantee 1 7 2 Galvanic isolator use with 4 4 Input 4 3 2 4 4 2 4 5 3 Installation 1 5 Local run time reset 4 5 10 Location 1 5 1 Maintenance 4 9 Routine 1 7 1 Power supply 4 3 1 4 4 1 Subject Section Rotational scale factor 4 5 6 Run time 4 1 Resetting 4 3 3 4 4 3 4 5 10 Resetting grand tot...

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Page 81: ...puts 5 5 Programming 5 5 1 Accessing programme functions 5 5 2 Function of instrument 5 5 3 Display format and units 5 5 4 Set display time 5 5 5 Set reset time 5 5 6 Security code 5 5 7 Control output enable 5 5 8 Setpoint times 5 5 9 Access setpoints 5 5 10 Adjusting control output setpoints when displaying time 5 6 Application 5 6 1 Calibration 5 7 Maintenance 5 7 1 Fault finding during commiss...

Page 82: ...pply is interrupted for more than 30ms the display will return to the flashing condition following initialisation 5 1 2 Controls The BA368C clock is controlled and calibrated via four front panel push button switches In the display mode i e when the instrument is displaying time the switch functions are Down P While these buttons are pushed the instrument will display the firmware and version numb...

Page 83: ...f about 340Ω When operating as a clock the BA368C consumes approximately 15mA and requires a minimum voltage of 10V between terminals 1 and 2 The supply voltage in the safe area must therefore be between 16V and the maximum working voltage of the Zener barrier usually about 26V 5 3 2 Synchronisation When terminals 7 8 are connected together the time displayed by the BA368C will be set to the prepr...

Page 84: ...lly set to the preprogrammed reset time The clock will be inhibited until terminals 7 8 are disconnected from each other when it will restart from the preprogrammed time To achieve reliable synchronisation terminals 7 8 should be connected together by a pair of contacts which close for at least one second This function enables one or more BA368C clocks to be synchronised with a master clock once e...

Page 85: ...ll the clock programmable parameters including those for the optional control outputs When read in conjunction with Fig 5 3 it provides a quick aid for programming the instrument If more detail is required each section contains a reference to a full description of the function SUMMARY OF PROGRAMME FUNCTIONS Display Description of function Function Function of instrument Enables the BA368C to be co...

Page 86: ...trol output 1 turns off for the first time See section 5 5 8 OP1 On2 Setpoint Defines the time at which control output 1 turns on for the second time See section 5 5 8 OP1 OFF2 Setpoint Defines the time at which control output 1 turns off for the second time See section 5 5 8 AcSP Access setpoint Sub menu that enables direct access to the control output setpoints from the display mode and defines ...

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Page 88: ...ed time select SEt from the main menu and press P to reveal the existing display with one digit flashing The value of the flashing digit can be changed by pressing the Up or Down buttons When this digit is correct pressing P will transfer control to the next digit When a twelve hour format has been selected in the dISPLAY function the displayed time will be prefixed by an A or a P to denote am or ...

Page 89: ...justed using the Up and Down push buttons The P button transfers control to the next digit When set as required press E to return the sub menu from which another setpoint may be selected Note Seconds are always displayed while the set points are being adjusted 5 5 9 Access Setpoint AcSP This function activates a separate menu that provides direct access to the control output setpoints when the clo...

Page 90: ...identification from which another setpoint may be selected or the clock may be returned to the display mode by pressing E again Fig 5 4 Setpoint adjustment from the clock display mode Each of the two control outputs has two or four setpoints depending upon whether the output has been programmed to turn on off once or twice in each 24 hour period see 5 5 7 Notes Direct access to the control output ...

Page 91: ...is found press P to reveal the existing setting Using the Up or Down buttons select 24 00 which will provide a 24 hour format without seconds Finally return to the main menu by pressing E Step 4 Setting the reset time Using the Up or Down button scroll through the main menu until rSEt t is displayed press P to reveal the existing setting with one digit flashing Using the Up or Down button to adjus...

Page 92: ... finding after commissioning ENSURE PLANT SAFETY BEFORE STARTING MAINTENANCE Live maintenance is permitted on intrinsically safe equipment installed in a hazardous area but only certified test equipment should be used unless a gas clearance certificate is available If a BA368C clock fails after it has been functioning correctly the following table may help to identify the cause of the failure Symp...

Page 93: ... time 5 5 9 5 5 10 Solid state outputs 1 9 3 1 Display 5 1 3 Format units 5 5 3 Set time 5 5 4 Function of instrument 5 5 2 Guarantee 1 7 2 Galvanic isolator use with 5 4 Installation 1 5 Location 1 5 1 Loss of power 5 1 1 Maintenance 5 7 Routine 1 7 1 Power supply 5 3 1 5 4 1 Programming 5 5 Fig 5 3 Accessing 5 5 1 Security Code 5 5 6 Override link 1 6 1 Servicing 1 7 Synchronisation 5 3 2 5 4 2 ...

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