BEKA BA427E Set Point Station Instruction Manual

BEKA BA427E Set Point Station

DESCRIPTION

The BA427E is an intrinsically safe loop-powered Set Point Station that enables the current flowing in a 4/20mA loop to be adjusted from within a hazardous area using the instrument front panel push buttons. The BA427E incorporates a 5-digit display that may be calibrated to show the 4/20mA output current in any linear engineering unit. A 31-segment bar graph indicates the current output. The Set Point Station output current may also be controlled by an external three-wire quadrature encoder.
An optional factory-fitted backlight, which may be loop or separately powered is available.

This abbreviated instruction sheet is intended to assist with installation and commissioning, a comprehensive instruction manual describing safety certification, system design and calibration may be downloaded from the BEKA website www.beka.co.uk/manuals.html or may be requested from the BEKA sales office.
The BA427E has IECEx, ATEX & UKEX intrinsic safety certifications for use in flammable gas and dust atmospheres. The certification label, which is located on the top of the instrument enclosure shows the certificate numbers and the certification codes. Copies of certificates may be downloaded from www.beka.co.uk

INSTALLATION

The BA427E has IP66 front of panel protection, but it is good practice to install the instrument where the front is protected from severe weather conditions and the display is not subjected to continuous direct sunlight. The rear of the instrument has IP20 protection.

Special Conditions for Safe use
Potential electrostatic charging hazard clean only with a damp cloth
Care should be taken when cleaning the front of the instrument, although the caution only applies to the enclosure as the glass window and keypad will not support an electrostatic charge.

IIIC dust atmospheres
When installed in a IIIC conductive dust atmosphere, the instrument terminals should have at least IP6X protection. This requirement does not apply for installations in a gas atmosphere or in IIIA or IIIB dusts

Cut-out dimensions
Recommended for all installations.
Mandatory to achieve an IP66 seal between the BA427E Set Point Station and the instrument panel
90 +0.5/-0.0 x 43.5 +0.5/-0.0mm

Abbreviated Instructions for BA427E intrinsically safe panel mounting Set Point Station

EMC
For specified immunity all wiring should be in screened twisted pairs, with the screens earthed at one point within the safe area.

Scale card
The Set Point Station’s units of measurement are shown on a printed scale card visible through a window at the right hand side of the display. The scale card is mounted on a flexible strip that is inserted into a slot at the rear of the instrument as shown below.

Thus the scale card can easily be changed without removing the Set Point Station from the panel or opening the instrument enclosure.
New Set Point Stations are supplied with a printed scale card showing the requested units of measurement, if this information is not supplied when the instrument is ordered a blank card will be fitted.
A pack of self-adhesive scale cards printed with common units of measurement is available as an accessory from BEKA associates. Custom printed scale cards can also be supplied.
To change a scale card, unclip the end of the flexible strip that is accessible from the rear of the instrument by gently pushing it upwards and pulling it out of the enclosure as shown in Fig 4.

Peel the existing scale card from the flexible strip and replace it with a new printed card, which should be aligned as shown below. Do not fit a new scale card on

OPERATION

The BA427E Set Point Station is controlled and configured via four front panel push buttons located below the display. In the operating mode i.e. when the Set Point Station is controlling the loop current and the display is showing the output in engineering units, these push buttons have the following functions:

• E* + ▼ Output current slowly decreases. After five seconds the rate of change accelerates so that large changes may be made quickly. Push E button first followed by ▼ button to decrease output current.
• E* + ▲ Output current slowly increases. After five seconds the rate of change accelerates so that large changes may be made quickly. . Push E button first followed by ▲ button to increase output current.
• Optional
• E Pushing this button for 5 seconds enables the Set Point Station output to be entered digit by digit in engineering units using the ▲ or ▼ push button to adjust the flashing digit and the P button to move control to the next digit. When set as required pressing the E button will enter the new set point value and the output current will change.
• P While this button is pushed the BA427E Set Point Station will display one of three alternatives depending upon how the instrument has been configured:
  Output current in mA
  Output as a % of span

Access to pre-set outputs

• The display will flash. While continuing to press the P button, operating the ▼ or ▲ button will show the identification of the pre-set closest to the present Set Point Station output, followed by the pre-set value. Operating the ▼ or ▲ button will scroll through the five pre-sets and an ‘Abort’ position.
• Releasing both buttons will leave the selected pre-set value or ‘Abort’ legend flashing for ten seconds, during which time operating the E button will update the Set Point Station output to the displayed pre-set value. If the E button is not operated during this period, the Set Point Station output will not be changed and the original engineering display will be shown.
• ▼ While this button is pushed the Set Point Station will display the numerical value the Set Point Station has been calibrated to display with a 4mA output. When released the normal display in engineering units will return.
• ▲ While this button is pushed the Set Point Station will display the numerical value the Set Point Station has been calibrated to display with a 20mA input. When released the normal display in engineering units will return.
• P + ▼ Firmware number followed by version.
• P + E Access to configuration menu via optional security code

CONFIGURATION

The BA427E Set Point Station is supplied calibrated as requested when ordered, if not specified default configuration will be supplied but can easily be changed on-site. Fig 6 shows the location of each function within the configuration menu with a brief summary of the function. Please refer to the full instruction manual for detailed configuration information.Access to the configuration menu is obtained by pressing the ( and ) buttons simultaneously. If the Set Point Station security code is set to the default 0000 the first parameter rE5n will be displayed. If the Set Point Station configuration menu is protected by a non-default security code, CodE will be displayed and the non-default code must be entered to obtain access to the menu.

The BA427E is CE marked to show compliance with the European Explosive Atmospheres Directive 2014/34/EU and the European EMC Directive 2014/30/EU.
It is also UKCA marked to show compliance with UK statutory requirements Equipment and Protective Systems Intended for Use in Potentially Explosive Atmospheres Regulations UKSI 2016:1107 (as amended) and with the Electromagnetic Compatibility Regulations UKSI 2016:1091 (as amended).

Full instructions, certificates, declarations of conformity and datasheets can be downloaded from http://www.beka.co.uk/ba427

References

• Instruction manuals
• BA427E and BA427E-SS Set point stations [set point generator], Intrinsically safe

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