BEKA BA627E-SS User manual

Issue: 2
5th May 2017
BA627E-SS
General purpose
2-wire 4/20mA
rugged manual set point
station
Issue: 2

1. Description
2. Operation
2.1 Controls - two handed
2.2 Controls - single handed
2.3 Displays
3. Electrical System Design
3.1 4/20mA loop
4. Installation
4.1 Location
4.2 Installation procedure
4.3 Instrument earthing
4.4 EMC
4.5 Scale card
5. Configuration 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 limit
5.7 Pre-set outputs
5.8 Maximum output rate of change
5.9 Function of (push button in operating
mode.
5.10 Encoder
5.11 One or two handed operation
5.12 Security code
5.13 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 Loop powering the backlight
7.3.2 Separately powering the backlight
7.4 External encoder
7.4.1 BEKA BA490 rotary encoder
22222222222222
The BA627E-SS is CE marked to show compliance with the
European EMC Directive 2004/108/EC
CONTENTS

1. DESCRIPTION
The BA627E-SS is a rugged general purpose, loop
powered panel mounting Set Point Station which en-
ables the current flowing in a 4/20mA loop to be
manually adjusted via the front panel push buttons,
or an optional external rotary control. The main ap-
plication is the adjustment of a plant parameter, such
as a controller set point or an actuator position, from
within a process area.
Housed in a rugged stainless steel enclosure with an
IP66 impact resistant front panel, the BA627E-
SS is ideal for applications in harsh and marine en-
vironment.
To simplify adjustment the Set Point Station incor-
porates a 5 digit display and a 31 segment bargraph
which may be calibrated to show the 4/20mA loop
current in any linear engineering units. An optional
factory fitted backlight, which may be loop or separ-
ately powered, enables this display to be read in all
lighting conditions.
The BA627E-SS loop current is adjustable between
3 and 22mA but the range may be restricted if only
limited adjustment is required. In addition to the out-
put being continuously variable, five pre-set output
currents may be configured and subsequently selec-
ted from the front panel push buttons. To minimise
plant disturbance the maximum output rate of
change may be defined.
2. OPERATION
Fig 1 shows a simplified block diagram of the
BA627E-SS 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 panel &and *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 but-
tons, 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 out-
puts or using an optional external encoder may be
defined.
The output resistance of the BA627E-SS 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-SS output should not be used for
critical safety applications.
Versatile calibration facilities allow the 5 digit internal
display to show the 4/20mA loop current in linear en-
gineering units. For example, in an application
where the BA627E-SS 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 con-
ditions. 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-SS
3

2.1 Controls - two handed
The BA627E-SS 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 can have two alternative
sets of functions depending upon whether the Set
Point Station has been configured for two or single
handed operation.
Two handed operation is the default configuration
which minimises the possibility of accidental adjust-
ment of the output current by requiring that the )
button be pressed at the same time as the &or *
button to make an adjustment. This configuration
also prevents the optional external encoder from ad-
justing the output current unless the )button is op-
erated.
)+ &Output current slowly decreases. After five
seconds the rate of change accelerates so
that large changes may be made quickly.
)+ *Output current slowly increases. After five
seconds the rate of change accelerates so
that large changes may be made quickly.
)Continuously 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 ad-
just the flashing digit and the (button to
move control to the next digit. When set
as required, pressing the )button will
enter the new set point.
(While this button is pushed the
BA627E-SS 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 % of span
Pre-set outputs in engineering units
The display will flash. While continuing
to press the (button, operating the
& or * button will show the identifica-
tion 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 operat-
ing the )button will update the Set
Point Station output to the displayed
pre-set value. If the )button is not op-
erated 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 CAL function, calibra-
tion points may not be at 4 and 20mA.
(+ &Firmware number followed by version.
(+ )Access to configuration menu via optional
security code.
2.2 Controls - single handed
The BA627E-SS 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 can have two alternative
sets of functions depending upon how the Set Point
Station has been configured.
For single handed operation only the &or *push
button has to be pressed to adjust the output current
as shown below. This configuration also allows the
optional external encoder to adjust the output current
without the )button being operated:
&Output current slowly decreases. After five
seconds the rate of change accelerates so
that large changes may be made quickly.
*Output current slowly increases. After five
seconds the rate of change accelerates so
that large changes may be made quickly.
)Continuously pushing this button for 5
seconds allows the Set Point Station out-
put to be entered in engineering units digit
by digit using the &or *push button to
adjust the flashing digit and the (button
to move control to the next digit. When
set as required, pressing the )button will
enter the new set point.
4

(While this button is pushed the
BA627E-SS 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 % of span
Pre-set outputs in engineering units
The display will flash. While continuing
to press the (button, operating the
&or *button will show the identifica-
tion 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 )button will update
the Set Point Station output to the dis-
played pre-set value. If the )button is
not operated during this period, the Set
Point Station output will not be changed
and the original engineering display will
be shown.
(+ &Firmware number followed by version.
(+ )Access to configuration menu via optional
security code.
2.3 Displays
The BA627E-SS Set Point Station has a 5 digit dis-
play plus a 31 segment bargraph.
The digital display may be calibrated using the CAL or
5Et functions to display the engineering variable rep-
resented 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.
5

3. ELECTRICAL SYSTEM DESIGN
3.1 4/20mA loop
The BA627E-SS requires an operating voltage
between 6.1 and 30V. Design of the loop is similar
to that for a 2-wire temperature or pressure transmit-
ter.
Fig 2 illustrates a typical application in which a
BA627E-SS is powered from a common supply.
When designing the loop it is only necessary to es-
tablish that the maximum voltage drop caused by the
Set Point Station, the load and cable resistance is al-
ways less than the minimum supply voltage.
For example:
Minimum operating voltage of BA627E-SS 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-SS.
Fig 2 Typical application
4. INSTALLATION
4.1 Location
The BA627E-SS Set Point Station has a stainless
steel case with a 10mm thick toughened glass win-
dow. The case provides 7J and the window 4J front
of panel impact protection. The captive silicone gas-
ket, which seals the joint between the instrument and
the panel enclosure, ensures IP66 front of panel in-
gress protection. The rear of the instrument has
IP20 protection.
Although the front of the instrument has IP66 protec-
tion, it should be shielded from continuous direct
sunlight and severe weather conditions.
The BA627E-SS Set Point Station may be installed
in any panel enclosure providing that the operating
temperature is between -40°C and +70°C.
Fig 3 shows the overall dimensions of the
BA627E-SS together with the recommended panel
cut-out dimensions and terminal identifications. To
achieve an IP66 seal between the instrument enclos-
ure and the instrument panel an aperture with the re-
commended tolerance should be used.
Fig 3 Dimensions
6

4.2 Installation Procedure
a. Cut the aperture specified in Fig 3 in the panel
enclosure. Ensure that the edges of the aper-
ture are de-burred.
b. Inspect the instrument's captive gasket and en-
sure that it is not damaged before inserting the
Set Point Station into the panel enclosure aper-
ture.
c. If the enclosure panel is less than 1.0mm thick,
or is non-metallic, an optional BEKA stainless
steel support plate should be slid over the rear
of the indicator before the panel clamps are fit-
ted to evenly distribute the clamping force and
prevent the enclosure panel being distorted or
creeping.
d. Slide a panel clamp into the two grooves at
each corner of the indicator housing with the
M3 stud protruding through the hole at the rear
of the clamp. Fit the stainless steel spring
washer over the stud and secure with the stain-
less steel wing nut.
e. Evenly tighten the four clamps to secure the
instrument. The recommended minimum
tightening torque for each wing nut is 22cNm
(1.95 lbf in).
f. Connect the panel enclosure wiring to the rear
terminal blocks. To simplify installation, the
terminals are removable so that wiring can be
completed before the instrument is installed.
Cables should be mechanically secured to en-
sure terminals are not damaged by vibration.
g. Finally, fit a silicone rubber push-on cap to the
end of each M3 threaded rod.
Fig 4 Installation procedure
4.3 Instrument earthing
The BA627E-SS Set Point Station has an M4 earth
stud on the rear panel which should be electrically
connected to the panel enclosure in which the instru-
ment is mounted, or to the plant equipotential con-
ductor.
4.4 EMC
The BA627E-SS Set Point Station complies with the
requirements of the European EMC Directive
2004/108/EC. For specified immunity all wiring
should be in screened twisted pairs, with the screens
earthed at a common point.
Fig 5 Rear terminals
7

4.5 Scale card
The Set Point Station's units of measurement are
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 6. Thus
the scale card can easily be changed without dis-
mantling the indicator or removing it from the en-
closure in which it is mounted.
New instruments are supplied with a printed scale
card showing the requested units of measurement, if
this information is not supplied when the Set Point
Station 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 ac-
cessory from BEKA associates. Custom printed
scale cards can also be supplied.
To change a scale card, unclip the protruding end of
the flexible strip by gently pushing it 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
below. Do not fit a new scale card on top of an ex-
isting card.
Install the new scale card by gently pushing the flex-
ible strip into the slot at the rear of the indicator,
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 of
the indicator.
Align the self-adhesive printed
scale card onto the flexible strip
and insert the strip into the in-
dicator as shown below.
Fig 6 Inserting flexible strip carrying scale card
into slot at the rear of Set Point Station.
8

5. CONFIGURATION AND CALIBRATION
Set Point Stations are configured and calibrated via
the four front panel push buttons. All the configura-
tion functions are contained in an easy to use intuit-
ive menu that is shown diagrammatically in Fig 7.
Each menu function is summarised in section 5.1
and includes a reference to more detailed informa-
tion.
Throughout this manual push buttons are shown as
(, ), &or *and the Set Point Station display
legends are shown in a seven segment font e.g. CAL
and CodE.
Access to the configuration menu is obtained by
operating the (and )push buttons simultan-
eously. If the Set Point Station security code is set to
the default 0000 the first parameter rE5n will be dis-
played. If a security code other than the default code
0000 has already been entered, the Set Point Station
will display CodE. Pressing the (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 (button to move control to
the next digit. When the correct four digit code has
been entered, pressing )will cause the first para-
meter 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 oper-
ating 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 7. When returning to the operating mode follow-
ing recalibration or a change to any function, the Set
Point Station will display dAtA followed by 5AVE 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 fol-
lowing default configuration:
Default Configuration
Resolution rE5n 10
Display at 4mA output 2ero 0 .00
Display at 20mA output 5PAn 100 .00
Output current limits H--L 03 .000 & 22 .000
Maximum output rate of change 000
(button in operating mode P.Fn PC
Pulses per rev of external encoder EnC 12
One or two handed operation Hnd 2 H
Security access code CodE 0000
Default configuration can easily be changed on-site.
5.1 Summary of configuration functions
This section summarises each of the configuration
functions and includes a cross reference to a more
detailed description. Fig 7 illustrates the location of
each function within the configuration menu.
Display Summary of function
rE5n Adjustment resolution
Defines the adjustment resolution of the
front panel &and *buttons and the
optional external rotary control when ad-
justing the output current with the Set
Point Station in the operating mode. May
be set to 1,10 or 100 least significant di-
gits 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 5Et are alternative ways of
calibrating the Set Point Station digital display.
CAL Calibration of 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 cal-
ibrated to show the engineering units rep-
resented by the 4/20mA output. Calibra-
tion may be performed at any output cur-
rent providing the points are at least 4mA
apart. Requires an accurate external
current meter.
See section 5.4
5Et Calibration of digital display using in-
ternal references.
Using the Set Point Station’s internal ref-
erence, this function enables the digital
display to be calibrated to show the en-
gineering units represented by the output
current at 4mA and 20mA. Unlike the
CAL 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 calibra-
tion can only be performed at 4 and
20mA.
See section 5.5
9

Display Summary of function
H--L High & low current output limits
Defines the lower ‘Lo’ 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 out-
puts are defined by this function. The
pre-set output currents are identified
5Et1 to 5Et5 and are displayed in engin-
eering units.
This function only appears in the config-
uration 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 of 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 of (push button in operat-
ing 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 (push button is pressed in
the operating mode.
See section 5.9
Display Summary of function
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
Hnd One or two handed operation
Allows the Set Point Station output cur-
rent to be adjusted by the front panel
&or *push button and by the optional
external encoder with or without the )
button be pressed at the same time.
See section 5.11
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 5.12
r5Et Reset
Returns the Set Point Station configura-
tion to the default condition. To prevent
accidental use, reset must be confirmed
by entering 5urE before it will be ex-
ecuted.
See section 5.13
10

11

5.2 Adjustment resolution: rE5n
This function enables the adjustment resolution of
the front panel &or *buttons and the optional al-
ternative 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 dis-
played digit will always be zero and the second least
significant digit will change when the front panel )
button plus the &or *button are pressed in the
operating mode, or the optional external rotary con-
trol 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 (which will re-
veal the current adjustment resolution. To change
the resolution press the &or *button to select 1,
10 or 100, followed by the )button to enter the se-
lection 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 resolu-
tion will be used to determine the pre-set output,
but the selected resolution will be restored when
the output is adjusted using the )button plus
the &or *button in the operating mode.
5.3 Position of 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 config-
uration menu and press (. The decimal point can
be moved by pressing the &or *push button. If
a decimal point is not required it should be posi-
tioned beyond the most or least significant digit.
When positioned as required press the )button to
enter the selection and return to the dP prompt in the
configuration menu.
5.4 Calibration of 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 en-
gineering 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 dis-
play to be entered.
The bargraph is not displayed while using the CAL
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 CAL
from the configuration menu and press (to enter
the 2Ero sub-menu used for calibrating the display at
the lower of the two output currents, usually
4.000mA. Pressing (again will result in ‘Adj’ be-
ing 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 (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 (will transfer control to the next digit.
When all the digits have been adjusted, press )to
enter the setting and return to the 2Ero prompt.
Calibration of the Set Point Station display at the up-
per output current is performed in exactly the same
way using the 5PAn sub-menu which may be selec-
ted 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 in-
creases, the required display value entered into 2Ero
should be greater than that entered into 5PAn.The
&or *buttons on the front of the instrument al-
ways 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 numer-
ical 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 )buttonispressedtore-
turn the Set Point Station to the operating mode.
5.5 Calibration of digital display using
internal reference: 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.
12

Unlike the CAL 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. Although not traceable to a calib-
rated standard, accuracy is adequate for many in-
dustrial applications.
To calibrate the Set Point Station’s digital display se-
lect 5Et from the configuration menu and press (.
The Set Point Station will display 4.000, pressing
(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 (will transfer
control to the next digit. When all the digits have
been adjusted, press )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 )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 in-
creases, the required display value entered into
4.000 should be greater than that entered into
20 .000.The&or *buttons on the front of the in-
strument 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-SS 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 tem-
perature 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--L from the configuration menu and
press (.Usingthe&or *button select Lo to
adjust the lower current output limit, or Hi to adjust
upper output current limit. Pressing )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 (will transfer control to the next digit.
When all the digits have been adjusted press )to
return to the Lo or Hi prompt followed by )to enter
the adjustments and return to the H--L prompt in the
configuration menu.
Notes:
a. The Lo limit can not be adjusted to a value
above the present Set Point Station output cur-
rent, 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 Lo and
Hi limits are adjusted.
b. If any of the five pre-set output currents are set
below the Lo limit or above the Hi limit, they will
not be selectable and oVEr or undEr will be dis-
played.
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 en-
ables common output currents to be quickly selec-
ted. e.g. frequently used operating temperatures
when a BA627E-SS is used as the set point input for
a temperature controller.
To enter pre-set values select P5Et from the config-
uration menu and press (which will result in
5Et 1, the first pre-set sub-menu being displayed,
pressing (will then reveal the present value in en-
gineering units with one digit flashing. The flashing
digit may be adjusted by pressing the &or *but-
ton, when the flashing digit is correct pressing (will
transfer control to the next digit. When all the digits
have been adjusted, press )to return to the 5Et 1
prompt from which any of the other four pre-sets
may be selected via the &or *button and adjus-
ted 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 (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 adjust-
ment resolution selected in function rE5n -see
5.2
c. If, after calibration of the Set Point Station dis-
play, previously entered pre-set values are out-
side the revised output current range, when se-
lected the pre-set value alternating with oVEr or
undEr will be displayed.
13

5.8 Maximum output rate of 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 configura-
tion menu and press (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 di-
git is correct pressing (will transfer control to the
next digit. When all the digits have been adjusted,
press )to enter the new value and return to the
configuration menu.
When the output rate of change limitation is function-
ing, in the operating mode the Set Point Station di-
gital 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 )button while the output is ramping to
a new requested value will stop the output changing.
5.9 Function of the (push button in
operating mode: P.Fn
Using this function the Set Point Station may be con-
figured 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 (button is pressed in the operating mode.
To check or change the function of the (push but-
ton select P.Fn from the configuration menu and
press (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 5.7
When set as required, press )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 which
complies with the requirements for simple apparatus
and is intended for use with the BA627E-SS. 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 resolu-
tion, 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 con-
figuration menu and press (which will reveal the
existing setting with one digit flashing. The flashing
digit may be adjusted by pressing the &or *but-
ton, when the flashing digit is correct pressing (will
transfer control to the other digit. When both digits
have been adjusted press )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 One or two handed operation: Hnd
This function defines whether the front panel )but-
ton has to be pushed at the same time that the
&or *button is operated, or the optional external
encoder is rotated to adjust the Set Point Station's
output current. Selecting the two handed operation
which requires the )button to be operated which
minimises the possibility of accidental adjustment.
To check or change the function select Hnd from the
configuration menu and press (to reveal the exist-
ing setting. Pressing the &or *button will toggle
between the two setting:
2 H Output current can only be adjusted
when the ) button is pressed.
1 H Output current can be adjusted
without pressing the ) button.
When set as required, press )to return to the Hnd
prompt in the configuration menu.
5.12 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 con-
figured with the default security code 0000 which al-
lows unrestricted access to all configuration func-
tions.
To enter a new security code select CodE from the
configuration menu and press (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 (button will
transfer control to the next digit.
14

When all the digits have been adjusted press )to
return to the CodE prompt. The revised security code
will be activated when the Set Point Station is re-
turned to the operating mode. Please contact BEKA
associates sales department if the security code is
lost.
5.13 Reset to factory defaults: r5Et
This function quickly returns to the BA627E-SS Set
Point Station to the factory default configurations
shown in section 5.
To reset the Set Point Station select r5Et from the
configuration menu and press (. To prevent acci-
dental resetting the request must be confirmed by
entering 5urE.Usingthe*button set the first
flashing digit to 5and press (to transfer control to
the second digit, which should be set to u. When
5urE has been entered pressing the )button will
reset the configuration menus and return the display
to the r5Et function in the configuration menu.
15

6. MAINTENANCE
6.1 Fault finding during commissioning
If a BA627E-SS 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 ter-
minal 12 positive.
No loop current
0V between ter-
minals 1 & 3 or
between terminals
3 & 12 if optional
backlight is loop
powered.
Incorrect wiring
or no power sup-
ply
Check supply
voltage and
voltage drop
caused by all the
instruments in the
loop.
Unstable 4/20mA
loop current.
Noisy power
supply or insuffi-
cient voltage to
power all the in-
struments in the
loop.
Eliminate ripple on
power supply or in-
crease supply
voltage.
Unable to enter
configuration
menu.
Incorrect secur-
ity code entered.
Enter correct se-
curity code, or
contact BEKA if
the code has been
lost.
BA627E-SS dis-
plays
LP Lo
Voltage between
BA627E-SS ter-
minal 1 & 3 is
too low,
Increase 4/20mA
loop supply
voltage.
6.2 Fault finding after commissioning
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
If a BA627E-SS 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-SS Set Point
Stations are returned to BEKA associates or to our
local agent for repair.
6.4 Routine maintenance
The mechanical and electrical condition of the instru-
ment should be regularly checked. Initially annual in-
spections are recommended, but the inspection fre-
quency 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 com-
ments from customers about our products and ser-
vices. All communications are acknowledged and
whenever possible, suggestions are implemented.
16

7. ACCESSORIES
7.1 Scale card
The BA627E-SS 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 out-
put current such as ºC or mBar can be seen. New
Set Point Stations are fitted with a scale card show-
ing the units specified when the instrument was
ordered, if the units are not specified when the in-
strument 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 remov-
ing it from the panel, See section 4.5 of this instruc-
tion manual.
Custom scale cards for applications requiring less
common units of measurement are also available.
7.2 Tag information
New Set Point Stations can be supplied with a tag
number or application information laser etched onto
the rear panel adjacent to the terminals. This tag in-
formation is not visible from the front of the instru-
ment after installation.
7.3 Display backlight
The BA627E-SS 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 back-
ground 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 in-
creased. When separately powered the backlight is
brighter, but additional field wiring is required.
Fig 8 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 9, which increases the minimum oper-
ating voltage to 10V.
Fig 9 Loop powered backlight
Providing the increased voltage drop can be toler-
ated, 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 10.
Fig 10 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 bril-
liance to be adjusted which is a useful feature when
the operator’s night vision has to be preserved.
17

7.4 External encoder
For applications requiring the output of the
BA627E-SS Set Point Station to be controlled ex-
ternally, 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-SS.
The Set Point Station’s output current can still be
controlled by the &and *buttons when an ex-
ternal encoder is connected.
With two handed operation the encoder only
changes the Set Point Station’s output when the )
button is operated - see section 2.1. Alternatively,
with single handed operation it is not necessary to
press the ) button - see section 2.2.
7.4.1 BEKA BA490 rotary encoder
The BEKA BA490 quadrature output rotary encoder
has been designed to operate with the BA627E-SS
Set Point Station. It is an IP66 panel mounting
device with a 20mm diameter control. The two out-
put waveforms and connections are shown in Fig
11.
Fig 11 BA490 rotary encoder output waveforms
Interconnections between the BA627E-SS Set Point
Station and the external BA490 Rotary Encoder are
shown below.
BA627E-SS BA490
Terminal Nos. Terminal Nos.
5A
6B
7C
18