BEKA BA627E User manual

Issue: 7
16th September 2015
BA627E
General Purpose
2-wire 4/20mA
manual set point
station.
For instruments with irmware 1.03
and earlier. Issued be ore June 2015.
Issue 7

1. Description
2. Operation
2.1 Controls
2.2 Displays
3. Electrical System Design
3.1 4/20mA loop
4. Installation
4.1 ocation
4.2 EMC
4.3 Instalation procedure
4.4 Scale card
5. Con iguration and Calibration
5.1 Summary of configuration functions
5.2 Adjustment resolution
5.3 Position of decimal point
5.4 Calibration of display using external
meter.
5.5 Calibration of display using internal
reference.
5.6 High & low current output limits
5.7 Pre-set outputs
5.8 Maximum output rate of change
5.9 Function of P push button in operating
mode.
5.10 Encoder
5.11 Security code
5.12 Reset to factory defaults
6. Maintenance
6.1 Fault finding during commissioning
6.2 Fault finding after commissioning
6.3 Servicing
6.4 Routine maintenance
6.5 Guarantee
6.6 Customer comments
7. Accessories
7.1 Scale card
7.2 Tag information
7.3 Display backlight
7,3,1 oop powering the backlight
7.3.2 Separately powering the backlight
7.4 External encoder
7.4.1 BEKA BA490 rotary encoder
22222
The BA627E is CE marked to show compliance with the
European EMC Directive 2004/108/EC
CONTENTS

1. DESCRIPTION
The BA627E is a general purpose, loop powered,
panel mounting Set Point Station which enables the
current flowing in a 4/20mA loop to be manually
adjusted from within a process area via the front
panel push buttons, or an optional external rotary
control. The BA627E output is adjustable between 3
and 22mA but the output range may be restricted if
only limited adjustment is required. In addition to the
output being continuously variable, five pre-set
output currents may be configured and subsequently
selected from the front panel push buttons. To
minimise plant disturbance the maximum output rate
of change may be defined.
Adjustment of a plant parameters represented by a
4/20mA current is the main application for BA627E
Set Point Stations. A controller set point, actuator
position or any 4/20mA variable may be manually
adjusted.
The BA627E incorporates a 5 digit display and a 31
segment bargraph which may be calibrated to
display the 4/20mA output current in any linear
engineering units. An optional factory fitted
backlight, which may be loop or separately powered,
enables this display to be read in all lighting
conditions.
2. OPERATION
Fig 1 shows a simplified block diagram of the
BA627E manual Set Point Station. The 4/20mA
current flowing in the loop may be manually set at
any value between approximately 3 and 22mA using
the front  and  panel push buttons. Initially the
output current changes slowly, but after the button
has been pressed for five seconds the rate of
change accelerates to allow large changes to be
made quickly.
The five pre-set outputs, which are selectable via the
instruments front panel push butons, allow the
operator to quickly select frequently used plant set
points.
To prevent plant disturbance the maximum rate of
output current change initiated by operating the front
panel push buttons, switching between pre-set
outputs or using an optional external encoder may
be defined.
The output resistance of the BA627E is very high,
within the specified operating voltage range, the loop
current will therefore be unaffected by changes in
the supply voltage.
Caution
The BA627E output should not be used for
critical safety applications.
Versatile calibration facilities allow the 5 digit internal
display to show the 4/20mA output current in linear
engineering units. For example, in an application
where the BA627E is being used to adjust the set
point of a speed controller, the internal indicator may
be calibrated to display the required speed in RPM.
For applications in poorly illuminated areas a factory
fitted green backlight is available which may be loop
or separately powered. When loop powered the
backlight produces background illumination enabling
the display to be read at night or in poor lighting
conditions. No additional power supply or field
wiring are required, but the Set Point Station voltage
drop is increased. When separately powered, the
backlight is brighter but additional field wiring is
required.
Fig 1 Simplified block diagram of BA627E
3

2.1 Controls
The BA627E 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.
Use of two buttons minimises possibility of
accidental adjustment.
E + ▲ Output current slowly increases. After five
seconds the rate of change accelerates so
that large changes may be made quickly.
Use of two buttons minimises possibility of
accidental adjustment.
EContinuously pushing this button for 5
seconds allows the Set Point Station
output to be entered in engineering units
digit by digit 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.
PWhile this button is pushed the BA627E
Set Point Station will display one of three
alternatives depending upon how the
instrument has been configured:
Output current mA without bargraph
Output as a % o span
Pre-set outputs in engineering units
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 and
analogue bargraph 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 and
analogue bargraph the Set Point Station
has been calibrated to display with a
20mA* input. When released the normal
display in engineering units will return.
* If the Set Point Station display has been
calibrated using the CA function,
calibration points may not be at 4 and
20mA.
P + ▼ Firmware number followed by version.
P + E Access to configuration menu via optional
security code.
2.2 Displays
The BA627E Set Point Station has a 5 digit display
plus a 31 segment bargraph.
The digital display may be calibrated using the ‘CA ’
or ‘5Et’ functions to display the engineering variable
represented by the Set Point Station’s 4/20mA
output, such as temperature, pressure or speed.
The digital display shows the requested Set Point
Station output in engineering units, the digital display
will flash until the Set Point Station output is the
same as the requested output.
The bargraph, which is not adjustable, always shows
the actual Set Point Station output. The bargraph
starts and finishes at the two currents at which the
digital display was calibrated, usually 4 and 20mA.
See sections 5.4 and 5.5.
4

3. ELECTRICAL SYSTEM DESIGN
3.1 4/20mA loop
The BA627E requires an operating voltage between
6.1 and 30V. Design of the loop is similar to that for
a 2-wire temperature or pressure transmitter.
Fig 2 illustrates a typical application in which a
BA627E is powered from a common supply. When
designing the loop it is only necessary to establish
that the maximum voltage drop caused by the Set
Point Station, the load and cable resistance is
always less than the minimum supply voltage.
For example:
Minimum operating voltage of BA627E 6.1V
Maximum voltage drop caused by
speed controller which is a 250ohm 5.0V
load (250ohms x 20mA)
Maximum voltage drop caused by cable 0.2V
resistance (10ohms x 20mA)
---------
Total maximum voltage drop 11.3V
The power supply voltage must therefore be greater
than 11.3V, but less than 30V which is the maximum
operating voltage of the BA627E.
Fig 2 Typical application
4. INSTALLATION
4.1 Location
The BA627E Set Point Station has a robust glass
reinforced Noryl enclosure with a toughened glass
window. The front of the instrument has IP66
protection and a gasket seals the joint between the
Set Point Station enclosure and the panel. The rear
of the instrument has IP20 protection.
Installation may therefore be in any panel providing
that the operating temperature is between –40ºC
and +70ºC.
Fig 3 shows the overall dimensions of the BA627E
together with the recommended panel cut-out
dimensions and terminal identifications. To achieve
an IP66 seal between the instrument enclosure and
the instrument panel an aperture with the
recommended tolerance should be used.
Fig 3 BA627E dimensions
5

Caution
Although the ront o the Set Point
Station has IP66 protection, it should be
shielded rom direct sunlight and severe
weather conditions.
4.2 EMC
BA627E Set Point Stations comply with the
requirements of the European EMC Directive
2004/108/EC. For specified immunity all wiring
should be in screened twisted pairs, with the cable
screen earthed at one point.
4.3 Installation Procedure
a. Cut the specified aperture in the panel. To
achieve an IP66 seal between the instrument
enclosure and the instrument panel the
aperture must have the dimensions specified
in Fig 3.
b. Slide the gasket over the body of the Set Point
Station before inserting the instrument into the
panel aperture.
c. Firstly ensure that both the panel mounting
clamps are closed by turning the knurled
screws fully anti clockwise until the two pips in
the clamp foot align with holes in the clamp
body.
d. Place a clamp in the recess on each side of
the Set Point Station, pulling gently to slide it
onto the dovetail as shown in Fig 4. Push the
knurled screw slightly forward to engage the
thread and tighten by turning clockwise until it
is just finger tight. When both clamps are fitted
ensure that the gasket behind the front panel
bezel is correctly positioned before fully
tightening the clamps to secure the instrument.
The maximum recommended clamp tightening
torque is 22cNm (1.95 lbf in) which is
approximately equvalent to finger-tight plus
one half turn. Do not over tighten.
e. Connect the panel wiring to the rear terminal
block(s) as shown in Fig 3. To simplify
installation, the terminals are removable so
that the panel wiring can be completed before
the instrument is installed.
Fig 4 Fitting panel mounting clamps
4.4 Scale card
The engineering units of measurement represent by
the Set Point Station’s 4/20mA output current may
be shown on a printed scale card in 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 in Fig 5.
Thus the scale card can easily be changed without
removing the Set Point Station from the panel or
opening the instrument enclosure.
New instruments 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 the strip upwards and
pulling it out of the enclosure. Peel the existing
scale card from the flexible strip and replace it with a
new printed card, which should be aligned as shown
in Fig 5. Do not fit a new scale card on top of an
existing card.
Install the new scale card by gently pushing the
flexible strip into the slot at the rear of the Set Point
Station, when it reaches the internal end-stop
secure it by pushing the end of the flexible strip
downwards so that the tapered section is held by the
rear panel.
6

Align the self-adhesive
printed scale card onto the
flexible strip and insert the
strip into the Set Point
Station as shown below.
Fig 5 Inserting flexible strip carrying scale card
into slot at the rear of Set Point Station.
7

5. CONFIGURATION AND CALIBRATION
Set Point Stations are configured and calibrated via
the four front panel push buttons. All the
configuration functions are contained in an easy to
use intuitive menu that is shown diagrammatically in
Fig 6.
Each menu function is summarised in section 5.1
and includes a reference to more detailed
information.
Throughout this manual push buttons are shown as
P, E, ▼ or ▲ and the Set Point Station display
legends are shown within inverted commas e.g.
'CA ' and 'CodE'.
Access to the configuration menu is obtained by
operating the P and E push buttons simultaneously.
If the Set Point Station security code is set to the
default 0000 the first parameter 'rE5n' will be
displayed. If a security code other than the default
code 0000 has already been entered, the Set Point
Station will display 'CodE'. Pressing the P button
will result in ‘0000’ being displayed with one digit
flashing. To gain access the four digit security code
should be entered using the ▲ and ▼ push buttons
to set the flashing digit and the P button to move
control to the next digit. When the correct four digit
code has been entered, pressing E will cause the
first parameter 'rE5n' to be displayed. If the code is
incorrect, or a button is not pressed within twenty
seconds, the Set Point Station will automatically
return to the operating mode.
Once within the configuration menu the required
parameter can be reached by scrolling through the
menu using the ▲ or ▼ push buttons as shown in
Fig 6. When returning to the operating mode
following recalibration or a change to any function,
the Set Point Station will display ‘dAtA’ followed by
‘SAVE’ while the new information is stored in
permanent memory.
All new Set Point Stations are supplied calibrated as
requested at the time of ordering. If calibration is not
requested, instruments will be supplied with the
following default configuration:
De ault Con iguration
Resolution ‘rE5n’ 10
Display at 4mA output ‘2ero’ 0.00
Display at 20mA output ‘5PAn’ 100.00
Output current limits ‘H - - ’ 03.000 & 22.000
Maximum output rate of change 000
P button in operating mode ‘P.Fn’ PC
Pulses per rev of external encoder ‘EnC’ 12
Security access code ‘CodE’ 0000
Default configuration can easily be changed on-site.
5.1 Summary o con iguration unctions
This section summarises each of the configuration
functions and includes a cross reference to a more
detailed description. Fig 6 illustrates the location of
each function within the configuration menu.
Display Summary o unction
'rE5n' Adjustment resolution
Defines the adjustment resolution of the
front panel ▲ and ▼ buttons and the
optional external rotary control when
adjusting the output current with the Set
Point Station in the operating mode. May
be set to ‘1’, ‘10’ or ‘100’ least significant
digits of the display.
See section 5.2
'dP' Decimal point
Positions a dummy decimal point
between any of the displayed digits or
turns it off.
See section 5.3
‘ CAL’ and ‘SEt’ are alternative ways o
calibrating the Set Point Station digital display.
'CAL' Calibration o the digital display using
an external current meter.
Preferred method of calibrating the digital
display which enables the zero and span
of the Set Point Station display to be
calibrated to show the engineering units
represented by the 4/20mA output.
Calibration may be performed at any
output current providing the points are at
least 4mA apart. Requires an accurate
external current meter.
See section 5.4
'5Et' Calibration o digital display using
internal re erences.
Using the Set Point Station’s internal
reference, this function enables the
digital display to be calibrated to show
the engineering units represented by the
output current at 4mA and 20mA.
Unlike the ‘CA ’ function, an accurate
external current measuring instrument is
not required and the Set Point Station
does not have to be disconnected from
the loop, but calibration can only be
performed at 4 and 20mA.
See section 5.5
8

Display Summary o unction
'H - - L' High & low current output limits
Defines the lower ‘ o’ and upper ‘Hi’
4/20mA Set Point Station output current
limits.
See section 5.6
'P5Et' Pre-set outputs
The values of the five pre-set current
outputs are defined by this function. The
pre-set output currents are identified
‘5Et1’ to ‘5Et5’ and are displayed in
engineering units.
This function only appears in the
configuration menu when ‘P5Et’, which
allows pre-set values to be viewed and
selected in the operating mode, is
selected in the ‘P.Fn’ function.
See section 5.7
'rAtE' Maximum output rate o change
Enables the maximum rate of change of
the 4/20mA output current to be defined.
Adjustable between approximately 1 and
100 seconds for full scale output travel.
0 disables this rate of change limit.
See section 5.8
'P.Fn' Function o P push button in
operating mode.
The Set Point Station may be configured
to display the output current in milliamps,
the output current as a percentage or to
provide access to the five pre-set outputs
when the P push button is pressed in the
operating mode.
See section 5.9
'EnC' Encoder
In addition to the Set Point Station
4/20mA output being adjusted by the
front panel push buttons, an external
quadrature encoder may be connected to
provide control via a rotary knob. This
function allows the number of pulses per
revolution of the knob to be entered.
See section 5.10
Display Summary o unction
'CodE' Security code
Defines a four digit numeric code that
must be entered to gain access to the
configuration menu. Default code 0000
disables this security function and allows
unrestricted access to all conditioning
functions.
See section 5.11
'r5Et' Reset
Returns the Set Point Station
configuration to the default condition. To
prevent accidental use, reset must be
confirmed by entering ‘5urE’ before it will
be executed.
See section 5.12
9

10

5.2 Adjustment resolution: ‘rE5n’
This function enables the adjustment resolution of
the front panel ▲ and ▼ buttons and the optional
alternative external rotary control to be defined. One
of three different resolutions may be selected ‘1’, ‘10’
or ‘100’ least significant digits of the Set Point
Station display. If ‘10’ is selected the least
significant displayed digit will always be zero and the
second least significant digit will change when the
front panel E button plus the ▲ or ▼ button are
pressed in the operating mode, or the optional
external rotary control is turned. Similarly, if ‘100’ is
selected the least two significant displayed digits will
always be zero and the third least significant digit
will change when the front panel buttons are
operated, or the optional external rotary control is
turned.
To define the adjustment resolution select ''rE5n'
from the configuration menu and press P which will
reveal the current adjustment resolution. To change
the resolution press the ▲ or ▼ button to select 1,
‘10’ or ‘100’, followed by the E button to enter the
selection and return to the configuration menu.
Notes:
a. This function does not affect the resolution of
adjustments made within the configuration
menu.
b. If a pre-set output has a finer resolution than
the selected adjustment resolution, the finer
resolution will be used to determine the pre-set
output, but the selected resolution will be
restored when the output is adjusted using the
E button plus the ▲ or ▼ button in the
operating mode,
5.3 Position o the decimal point: ‘dP’
A dummy decimal point can be positioned between
any of the displayed digits or it may be absent. To
position the decimal point, select 'dP' from the
configuration menu and press P. The decimal point
can be moved by pressing the ▲ or ▼ push button.
If a decimal point is not required it should be
positioned beyond the most or least significant digit.
When positioned as required press the E button to
enter the selection and return to the ‘dP’ prompt in
the configuration menu.
5.4 Calibration o the digital display using an
external current meter: ‘CAL’
This function is the preferred method of calibrating
the Set Point Station digital display to show the
engineering units represented by the 4/20mA output.
The function enables the Set Point Station output
current to be set at two different values, Zero and
Span, measured by a calibrated external current
meter and the corresponding Set Point Station
display to be entered.
The bargraph is not displayed while using the ‘CA ’
function.
Although calibration is normally performed at
4.000mA and 20.000mA, other currents may be
used providing they differ by more than 4mA.
To calibrate the Set Point Station display, select
'CA ' from the configuration menu and press P to
enter the ‘2Ero’ sub-menu used for calibrating the
display at the lower of the two output currents,
usually 4.000mA. Pressing P again will result in
‘Adj’ being displayed which is an invitation to adjust
the Set Point Station output current using the ▲ or
▼ push button. Pressing either of these buttons will
cause the output current to change, gradually
accelerating as the button is held. Alternatively the
external rotary encoder may be used. When the
external current meter shows the required lower
output current e.g. 4.000mA, press P to reveal the
existing Set Point Station digital display with one
digit flashing. The flashing digit may be adjusted by
pressing the ▲ or ▼ button, when this digit is set as
required pressing P will transfer control to the next
digit. When all the digits have been adjusted, press
E to enter the setting and return to the '2Ero' prompt.
Calibration of the Set Point Station display at the
upper output current is performed in exactly the
same way using the ‘5PAn’ sub-menu which may be
selected from the ‘2ero’ prompt using the ▲ or ▼
button.
To obtain a reverse acting display i.e. the Set Point
Station display decreases as the output current
increases, the required display value entered into
‘2Ero’ should be greater than that entered into
‘5PAn’. The ▲ and ▼ buttons on the front of the
instrument always indicate which way the display will
change when the button is pushed.
The bargraph will start at the numerical display
entered for ‘2Ero’ calibration and finish at the
numerical display entered for ‘5Pan’ calibration,
except for reverse acting calibration when the
bargraph will also be reversed.
Note:
a. If the specified ‘2Ero’ and ‘5PAn’ output
currents do not differ by 4 or more milliamps,
they will not be stored when the E button is
pressed to return the Set Point Station to the
operating mode.
5.5 Calibration o digital display using internal
re erence: ‘5Et’
Using the Set Point Station’s internal reference, this
function enables the digital display to be calibrated
to show the engineering units represented by the
output current at 4mA and 20mA. Unlike the ‘CA ’
function, an accurate external current measuring
instrument is not required and the Set Point Station
does not have to be disconnected from the loop,
however calibration can only be performed at 4mA
and 20mA.
11

Although not traceable to a calibrated standard,
accuracy is adequate for many industrial
applications.
To calibrate the Set Point Station’s digital display
select 'SEt' from the configuration menu and press
P. The Set Point Station will display '4.000',
pressing P again will reveal the calibrated display at
4mA output with one digit flashing. The flashing
digit may be adjusted by pressing the ▲ or ▼
buttons, when the flashing digit is correct pressing P
will transfer control to the next digit. When all the
digits have been adjusted, press E to return to the
'4.000' prompt.
Calibration of the Set Point Station display at 20mA
output is performed in exactly the same way using
the ‘20.000’ sub-menu which may be selected from
the ‘4.000’ prompt using the ▲ or ▼ button. When
the display corresponding to a 20mA output has
been entered pressing E twice will enter the setting
and return to the ‘5Et’ prompt in the configuration
menu.
The bargraph is not displayed while using the ‘5Et’
function
To obtain a reverse acting display i.e. the Set Point
Station display decreases as the output current
increases, the required display value entered into
‘4.000’ should be greater than that entered into
’20.000’. The ▲ and ▼ buttons on the front of the
instrument always indicate which way the display will
change when the button is pushed.
The bargraph will start at the numerical display
entered for 4mA output and finish at the numerical
display entered for 20mA output, except for reverse
acting calibration when it will also be reversed.
5.6 High & low current output limits: ‘H - - L’
The BA627E output is normally adjustable between
3 and 22mA, but may be restricted by this function if
a limited adjustment range is required. e.g. to
prevent a dangerously high and/or low temperature
being selected when used as the set point input for a
temperature controller. When the Set Point Station’s
output current equals the high limit, ‘oVEr’ is
displayed, similarly ‘undEr’ is displayed when the
output current equals the low limit.
To restrict the Set Point Station’s output current
range select 'H - - ' from the configuration menu
and press P. Using the ▲ or ▼ button select ‘ o’ to
adjust the lower current output limit, or ‘Hi’ to adjust
upper output current limit. Pressing E will display the
selected output current limit in milliamps with one
digit flashing. The flashing digit may be adjusted by
pressing the ▲ or ▼ button, when the flashing digit
is correct pressing P will transfer control to the next
digit.
When all the digits have been adjusted press E to
return to the ' o' or ‘Hi’ prompt followed by E to enter
the adjustments and return to the ‘H - - ’ prompt in
the configuration menu.
Notes:
a. The o limit can not be adjusted to a value
above the present Set Point Station output
current, and the Hi limit can not be adjusted to a
value below the present Set Point Station
output current. The actual Set Point Station
output current should therefore be adjusted to
within the acceptable output range before the
o and Hi limits are adjusted.
b. If any of the five pre-set output currents are set
below the o limit or above the Hi limit, they will
not be selectable and ‘oVEr’ or ‘undEr’ will be
displayed.
5.7 Pre-set outputs: ‘P5Et’
Up to five pre-set current outputs may be stored and
recalled from the front panel push buttons which
enables common output currents to be quickly
selected. e.g. frequently used operating
temperatures when a BA627E is used as the set
point input for a temperature controller.
To enter pre-set values select ‘P5Et’ from the
configuration menu and press P which will result in
‘5Et 1’, the first pre-set sub-menu being displayed,
pressing P will then reveal the present value in
engineering units with one digit flashing. The
flashing digit may be adjusted by pressing the ▲ or
▼ button, when the flashing digit is correct pressing
P will transfer control to the next digit. When all the
digits have been adjusted, press E to return to the
'5Et 1' prompt from which any of the other four pre-
sets may be selected via the ▲ or ▼ button and
adjusted in the same way as ‘5Et 1’.
Notes:
a. ‘P5et’ only appears in the configuration menu
when ‘P5Et’ is selected in the ‘P.Fn’ menu
which defines the function of the P push button
in the operating mode. see section 5.9.
b. Maximum adjustment resolution is always
available for inputting pre-set values and is
used to determine the current output when the
pre-set is selected, irrespective of the
adjustment resolution selected in function
‘rE5n’ – see 5.2
c. If, after calibration of the Set Point Station
display, previously entered pre-set values are
outside the revised output current range, when
selected the pre-set value alternating with
‘oVEr’ or ‘undEr’ will be displayed.
12

5.8 Maximum output rate o change: ‘rAtE’
To minimise plant disturbance when the Set Point
Station output current is adjusted, the maximum rate
of change is defined by this function. The maximum
rate is adjustable between approximately 1 and 100
seconds for full scale output travel from 4 to 20mA.
If 0 seconds is selected the function is disabled.
To define the maximum rate of change of the Set
Point Station output select 'rAtE' from the
configuration menu and press P which will reveal the
present maximum rate of change in seconds with
one digit flashing. The flashing digit may be
adjusted by pressing the ▲ or ▼ buttons, when the
flashing digit is correct pressing P will transfer
control to the next digit. When all the digits have
been adjusted, press E to enter the new value and
return to the configuration menu.
When the output rate of change limitation is
functioning, in the operating mode the Set Point
Station digital display will show the requested output
and will flash until the requested output current is
achieved. The bargraph display always shows the
Set Point Station’s actual output.
Pressing the E button while the output is ramping to
a new requested value will stop the output changing.
5.9 Function o the P push-button in operating
mode: ‘P.Fn’
Using this function the Set Point Station may be
configured to display the output current in milliamps,
the output current as a percentage of the output
range, or to provide access to the five pre-set
outputs when the P button is pressed in the
operating mode.
To check or change the function of the P push
button select 'P.Fn' from the configuration menu and
press P to reveal the present setting. Pressing the
▲ or ▼ button will scroll the setting between:
'PC' Output as a percentage of output
range.
'4-20' Output current in milliamps
‘P5Et’ Access to the five pre-set outputs
see 6.7
When set as required, press E to return to the ‘P.Fn’
prompt in the configuration menu.
5.10 Encoder: ‘EnC’
For applications requiring the Set Point Station’s
4/20mA output current to be controlled by a rotary
knob, an external three wire quadrature encoder
may be directly connected to terminals 5, 6 and 7.
The BEKA BA490 Is a panel mounting encoder that
generates 12 contact pulses per revolution and is
intended for use with the BA627E. Other encoders
that produce a different number of contact pulses
per revolution may also be used. So that all external
encoders have a similar adjustment resolution, the
‘EnC’ function enables the number of pulses
between 6 and 48 per revolution to be defined.
To enter the number of pulses per revolution that the
external encoder generates, select 'EnC' from the
configuration menu and press P which will reveal the
existing setting with one digit flashing. The flashing
digit may be adjusted by pressing the ▲ or ▼
button, when the flashing digit is correct pressing P
will transfer control to the other digit. When both
digits have been adjusted press E to return to the
‘EnC’ prompt in the configuration menu.
Section 7.4 contains information about the use of an
external rotary encoder.
5.11 Security code: ‘CodE’
Access to the instrument configuration menu may be
protected by a four digit security code which must be
entered to gain access. New instruments are
configured with the default security code 0000 which
allows unrestricted access to all configuration
functions.
To enter a new security code select 'CodE' from the
configuration menu and press P which will cause the
Set Point Station to display the existing security
code with one digit flashing. The flashing digit can
be adjusted using the ▲ and ▼ push buttons, when
set as required operating the P button will transfer
control to the next digit. When all the digits have
been adjusted press E to return to the ‘CodE’
prompt. The revised security code will be activated
when the Set Point Station is returned to the
operating mode. Please contact BEKA associates
sales department if the security code is lost.
5.12 Reset to actory de aults: ‘rSEt’
This function quickly returns to the BA627E Set
Point Station to the factory default configurations
shown in section 5.
To reset the Set Point Station select ‘rSEt’ from the
configuration menu and press P. To prevent
accidental resetting the request must be confirmed
by entering ‘5urE’. Using the ▲ button set the first
flashing digit to ‘5’ and press P to transfer control to
the second digit, which should be set to ‘u’. When
‘5urE’ has been entered pressing the E button will
reset the configuration menus and return the display
to the ‘rSEt’ function in the configuration menu.
13

6. MAINTENANCE
6.1 Fault inding during commissioning
If a BA627E Set Point Station fails to function during
commissioning the following procedure should be
followed:
Symptom Cause Solution
No loop current Incorrect wiring Check wiring
There should be
6.1 to 30V
between terminals
1 & 3 with terminal
1 positive.
With an optional
backlight which is
loop powered,
there should be
10V to 30V
between terminals
3 & 12 with
terminal 12
positive.
No loop current
0V between
terminals 1 & 3 or
between terminals
3 & 12 if optional
backlight is loop
powered.
Incorrect wiring
or no power
supply
Check supply
voltage and
voltage drop
caused by all the
instruments in the
loop.
Unstable 4/20mA
loop current.
Noisy power
supply or
insufficient
voltage to power
all the
instruments in
the loop.
Eliminate ripple on
power supply or
increase supply
voltage.
Unable to enter
configuration
menu.
Incorrect
security code
entered.
Enter correct
security code, or
contact BEKA if
the code has been
lost.
BA627E displays
‘ P o’
Voltage between
BA627E terminal
1 & 3 is too low,
Increase 4/20mA
loop supply
voltage.
6.2 Fault inding a ter commissioning
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
If a BA627E Set Point Station fails after it has been
functioning correctly follow the procedure shown in
section 6.1. If this does not reveal the cause of the
fault, it is recommended that the Set Point Station is
replaced.
6.3 Servicing
We recommend that faulty BA627E Set Point
Stations are returned to BEKA associates or to our
local agent for repair.
6.4 Routine maintenence
The mechanical and electrical condition of the
instrument should be regularly checked. Initially
annual inspections are recommended, but the
inspection frequency should be adjusted to suit the
environmental conditions.
6.5 Guarantee
Set Point Stations which fail within the guarantee
period should be returned to BEKA associates or
our local agent. It is helpful if a brief description of
the fault symptoms is provided.
6.6 Customer comments
BEKA associates is always pleased to receive
comments from customers about our products and
services. All communications are acknowledged
and whenever possible, suggestions are
implemented.
14

7. ACCESSORIES
7.1 Scale card
The BA627E Set Point Station has a window on the
right hand side of the display through which the
scale card showing the units represented by the
output current such as ºC or mBar can be seen.
New Set Point Stations are fitted with a scale card
showing the units specified when the instrument was
ordered, if the units are not specified when the
instrument is ordered a blank scale card will be
fitted. A pack of scale cards pre-printed with
common units of measurement is available as an
accessory. These can easily be fitted to the Set
Point Station without opening the instrument
enclosure or removing it from the panel, See
section 4.4 of this instruction manual.
Custom scale cards for applications requiring less
common units of measurement are also available.
7.2 Tag in ormation
New Set Point Stations can be supplied with tag or
application information thermally printed onto the
rear panel adjacent to the terminals. This tag
information is not visible from the front of the
instrument after installation.
7.3 Display backlight
The BA627E Set Point Station can be supplied with
a factory fitted green backlight that may be loop or
separately powered.
When loop powered the backlight produces
background illumination enabling the display to be
read at night or in poor lighting conditions. No
additional power supply or field wiring are required,
but the Set Point Station’s minimum operating
voltage is increased. When separately powered the
backlight is brighter, but additional field wiring and a
power supply are required.
Fig 7 Terminals for optional backlight
7.3.1 Loop powering the backlight
The backlight is loop powered by connecting it in
series with the Set Point Station’s 4/20mA output as
shown in Fig 8, which increases the minimum
operating voltage to 10V.
Fig 8 oop powered backlight
Providing the increased voltage drop can be
tolerated, the system design described in sections 3
of this manual remain valid with the backlight loop
powered.
7.3 .2 Separately powering the backlight
The optional backlight may also be powered from a
separate power supply as shown in Fig 9.
Fig 9 Separately powered backlight
When separately powered the backlight draws a
constant current of 22.5mA at or above 9V. Below
this voltage the backlight continues to function but
with reduced brilliance. Powering the backlight from
an adjustable voltage supply allows the backlight
brilliance to be adjusted which is a useful feature
when the operator’s night vision has to be
preserved.
15

7.4 External encoder
For applications requiring the output of the BA627E
Set Point Station to be controlled externally,
terminals 5, 6 and 7 enable a wide range of three
wire quadrature encoders with switch contact
outputs to be directly connected to the BA627E. To
prevent accidental adjustment, the encoder only
changes the Set Point Station’s output when the E
button is operated. The Set Point Station’s output
current can still be controlled by the ▲ and ▼
buttons when an external encoder is connected.
7.4.1 BEKA BA490 rotary encoder
The BEKA BA490 quadrature output rotary encoder
has been designed to operate with the BA627E Set
Point Station. It is an IP66 panel mounting device
with a 20mm diameter control. The two output
waveforms and connections are shown in Fig 10.
Fig 10 BA490 rotary encoder output waveforms
Interconnections between the BA627E Set Point
Station and the external BA490 Rotary Encoder are
shown below.
BA627E BA490
Terminal Nos, Terminal Nos,
5 A
6 B
7 C
16