Fema Electronica B Series User manual

Series B . Models Bxx-LC
Meters for load cells
Large format industrial meters for load cells. Dierent formats available with 60 mm and 100 mm digit
height, 4 and 6 digits, in red or green color. Sturdy metal housing, with full IP65 protecon, designed for
panel, wall or hanging mount. Versale and congurable, provides excitaon voltage to power up to 8
load cells. Fast access to alarm setpoints, ‘tare’ and ‘auto-tare’ funcons, stability alarms, congurable
operator menu, congurable brightness. Universal AC and DC power. Accepts up to 3 output and control
opons (relays, analog retransmission, Modbus RTU, transistor outputs, RS-485 ASCII, ...). Conguraon
from frontal keypad or remote keypad.
www.fema.es
Tel. [phone] inf[email protected]
INDUSTRIAL SERIES . LARGE FORMAT METERS
4625r04
User’s Manual
ELECTRONICS FOR INDUSTRIAL AUTOMATION
PANEL METERS . SIGNAL CONVERTERS . LARGE DISPLAYS

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
2
1. Series B, models Bxx-LC
Large format industrial meters for load cells
Large format meters for long distance reading, for industrial
applicaons. Dierent formats available with 4 and 6 digits,
with 60 mm and 100 m digit height. Front keypad to access
the conguraon menu, and oponal remote keypad.
For load cell signals, scalable reading from ‘999999’ to
‘-199999’ (or ‘9999’ to ‘-1999’ for 4 digit formats) and con-
gurable decimal point. Provides excitaon voltage congu-
rable to +5 Vdc or +10 Vdc to power up to 8 standard 350 Ohm
cells. ‘Tare’ funcon with congurable controls, and ‘auto-
tare’ funcon for automac tare correcon when weight is
removed from the cell. Three working modes with dierent
acquision speeds and noise rejecon to 50 and 60 Hz.
Output and control opons with 1, 2 and 3 relays, transis-
tor outputs, controls for SSR relays, isolated analog outputs,
communicaons in Modbus RTU, RS-485 ASCII and RS-232.
Independent alarms congurable as maximum or minimum,
with acvaon at setpoint or when reading is stable, with 1
or 2 setpoints per alarm, hysteresis, independent acvaon
and deacvaon delays and congurable locked alarms (see
secon 1.13.9)
Sturdy metal housing with full IP65 protecon. Internal
connecons by plug-in screw clamp terminals, and output
through cable glands. Housing prepared for panel, wall and
hanging mount.
• congurable ‘Fast access’ to selected funcons with key
‘UP’ (5) (see secon 1.13.13)
• tare accessible from frontal key or rear contact (see sec-
on 1.11)
• automac ‘auto-tare’ funcon (see secon 1.13.4)
• access to gross weight value and tare value
(see secon 1.9.4)
• funcon ‘On power-up’ for automac acvaon of func-
ons at start-up (see secon 1.13.14)
• scale factor for easy modicaon of reading units (see
secon 1.13.5)
• ‘stock units’ funcon to count units (see secon 1.13.6)
• access to the measured signal value (in mV), excitaon
current provided (in mA) and real excitaon voltage (see
secon 1.13.15)
Mulple display lters, memory of maximum and minimum
reading, password protecon, 5 brightness levels.
1. Idenfy the instrument format (see secon 1.4)
2. Power and signal connecons
- open the instrument (see secon 1.5)
- connect the power (see secon 1.7)
- connect the signal (see secon 1.10)
- read recommendaons to connect the ‘sense’ (see secon
1.10.1)
and for load cell ground connecons (see secon 1.10.2)
- close the instrument (see secon 1.5)
3. Inial setup (see secon 1.13.2)
- theorecal conguraon of the cell (obtain the load cell
data : sensivity, load and excitaon) and congure the
instrument
- apply the empirical conguraon of the cell (apply the
high and low ‘eld correcon’)
- assign the ‘system zero’
4. Advanced conguraon (oponal) (see secon 1.13.7)
- tare conguraon, see secons 1.11 and 1.13.4
- funcon ‘stock units’ (see secon 1.13.6)
- scale factor (see secon 1.13.5)
- acquision modes (see secon 1.9.1)
1.1 How to use this manual
If this is the rst me you are conguring a Series B large
format meter, below are the steps to follow to install and
congure the instrument. Read all the manual secons in
order to have a full and clear view of the characteriscs of
the instrument. Do not forget to read the installaon precau-
ons at secon 1.21.
5. Congure the alarms (oponal) (see secon 1.13.8)
6. Display lters (oponal) (see secon 1.13.10)
7. Congure operator controls (oponal)
- congure the rear control (see secon 1.13.11)
- congure the front key ‘LE’ (3)(see secon 1.13.12)
- congure the fast access (key ‘UP’ (5)) (see secon 1.13.13)
8. Congure other funcons (oponal)
- congure the ‘on power-up’ funcon (see secon 1.13.14)
- congure the password and brightness level (see secon 1.13.17)
9. If the instrument includes analog output (AO) or serial
communicaons (RTU, S4, S2)
- to include an opon to an instrument see secon 1.6
- to congure an installed opon, access the opon con-
guraon menu (see secon 1.13.18)
- see secon 2 for informaon regarding the output and
control opons available
10. Install the instrument
- mount on panel, wall or hanging (see secon 1.20)
- adjust the brightness level according to your environmen-
tal needs (see secon 1.13.17)

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
3
1. Series B, models Bxx-LC . . . . . . . . . . . . . . . . . . 2
1.1 How to use this manual . . . . . . . . . . . . . . . . 2
1.2 How to order . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4 Sizes and formats . . . . . . . . . . . . . . . . . . . . 4
1.4.1 Format B24. . . . . . . . . . . . . . . . . . . . . . 4
1.4.2 Format B44. . . . . . . . . . . . . . . . . . . . . . 4
1.4.3 Format B26. . . . . . . . . . . . . . . . . . . . . . 5
1.4.4 Format B46. . . . . . . . . . . . . . . . . . . . . . 5
1.5 To access the instrument . . . . . . . . . . . . . . . . 6
1.6 Modular system . . . . . . . . . . . . . . . . . . . . . 6
1.7 Power connecons and protecve earth . . . . . . . 7
1.8 Connecons for remote keypad . . . . . . . . . . . . 7
1.9 Technical specicaons. . . . . . . . . . . . . . . . . 8
1.9.1 Acquision modes. . . . . . . . . . . . . . . . . . 9
1.9.2 Signal ranges . . . . . . . . . . . . . . . . . . . . . 9
1.9.3 Number and type of cells accepted . . . . . . . . 9
1.9.4 Gross weight, net and tare . . . . . . . . . . . . . 9
1.10 Input signal connecons . . . . . . . . . . . . . . 10
1.10.1 Connecng the ‘sense’ . . . . . . . . . . . . . 10
1.10.2 Connecng the cell to the ground . . . . . . . 10
1.10.3 Real cases. . . . . . . . . . . . . . . . . . . . . 10
1.11 ‘Tare’ funcons included . . . . . . . . . . . . . . 11
1.12 Funcons included . . . . . . . . . . . . . . . . . 11
1.13 Conguraon . . . . . . . . . . . . . . . . . . . . 13
1.13.1 How to operate the menus . . . . . . . . . . . 13
1.13.2 Inial set-up . . . . . . . . . . . . . . . . . . . 14
1.13.3 Inial setup menu . . . . . . . . . . . . . . . . 15
1.13.4 Funcon ‘auto-tare’ . . . . . . . . . . . . . . . 16
1.13.5 Scale factor . . . . . . . . . . . . . . . . . . . . 16
1.13.6 Funcon ‘stock’ . . . . . . . . . . . . . . . . . 16
1.13.7 Advanced conguraon menu . . . . . . . . . 17
1.13.8 Alarms . . . . . . . . . . . . . . . . . . . . . . 18
1.13.9 Alarm conguraon . . . . . . . . . . . . . . . 19
1.13.10 Display lters . . . . . . . . . . . . . . . . . . 20
1.13.11 Rear controls . . . . . . . . . . . . . . . . . . 21
1.13.12 Front key ‘LE’ (3). . . . . . . . . . . . . . . 21
1.13.13 Fast access . . . . . . . . . . . . . . . . . . . 22
1.13.14 ‘On power-up’ funcon . . . . . . . . . . . . 22
1.13.15 ‘Fast access’ conguraon menu . . . . . . . 23
1.13.16 ‘On power-up’ conguraon. . . . . . . . . . 23
1.13.17 Tools . . . . . . . . . . . . . . . . . . . . . . . 24
1.13.18 Access to the opons conguraon menu . . 25
1.14 Full conguraon menu. . . . . . . . . . . . . . . 26
1.15 Factory conguraon . . . . . . . . . . . . . . . . 28
1.16 Messages and errors . . . . . . . . . . . . . . . . 29
1.17 Material included . . . . . . . . . . . . . . . . . . 29
1.18 Addional informaon . . . . . . . . . . . . . . . 29
1.19 Praccal cases . . . . . . . . . . . . . . . . . . . . 30
1.19.1 Normal case . . . . . . . . . . . . . . . . . . . 30
1.19.2 Load cell with external power . . . . . . . . . 30
1.19.3 Connecons with a juncon box . . . . . . . . 30
1.19.4 Connecons with 3 or 4 load cells . . . . . . . 31
1.19.5 Measuring mV at the laboratory . . . . . . . . 31
1.20 Mounng. . . . . . . . . . . . . . . . . . . . . . . 32
1.21 Installaon precauons . . . . . . . . . . . . . . . 33
1.22 Warranty . . . . . . . . . . . . . . . . . . . . . . . 33
1.23 CE declaraon of conformity . . . . . . . . . . . . 33
2. Output and control modules . . . . . . . . . . . . . . 34
2.1 Module R1 . . . . . . . . . . . . . . . . . . . . . . . 34
2.2 Module T1 . . . . . . . . . . . . . . . . . . . . . . . 34
2.3 Module SSR . . . . . . . . . . . . . . . . . . . . . . 35
2.4 Module AO . . . . . . . . . . . . . . . . . . . . . . 35
2.5 Module RTU . . . . . . . . . . . . . . . . . . . . . . 36
2.6 Module S4 . . . . . . . . . . . . . . . . . . . . . . . 36
2.7 Module S2 . . . . . . . . . . . . . . . . . . . . . . . 37
3. Other opons and accessories . . . . . . . . . . . . . 38
3.1 RKB - Remote keypad . . . . . . . . . . . . . . . . . 38
3.3 Red LED . . . . . . . . . . . . . . . . . . . . . . . . 38
3.2 Output cable . . . . . . . . . . . . . . . . . . . . . 38
3.4 Green LED . . . . . . . . . . . . . . . . . . . . . . . 38
1.2 How to order
B46 LC
Model Power
-H -
Opon 1
- -
Opon 2
-
Opon 3*
-R1 (1 relay)
-AO (analog output)
-RTU (Modbus RTU)
-S4 (RS-485)
-S2 (RS-232)
-T1 (1 transistor)
-SSR (1 control SSR)
-0 (empty)
-H (85-265 Vac
and 120-370 Vdc)
-L (11-36 Vdc isolated)
Color
-
-R (red led)
-G (green led)
B24 (60 mm, 4 digits)
B26 (60 mm, 6 digits)
B44 (100 mm, 4 digits)
B46 (100 mm, 6 digits)
Others
-
Format
*Opon 3 available
with formats B26 and
B46
1.3 Index

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
4
1.4 Sizes and formats
1.4.1 Format B24
Size A 340 mm
Size B 135 mm
Size C 3 mm
Size D 55 mm
Size E 25 mm
Table 1 - Sizes B24
Cut-out G 322 mm (±1)
Cut-out F 117 mm (±1)
Table 2 - Panel cut-out B24
A
Power
Opon 2 Opon 1
Remote keypad
Signal
Power
Slot for opon 2
Slot for opon 1
Input signal terminal
Remote keypad terminal
CDE
Cable glands
B
F
G
Panel cut-out
(see Table 2)
1.4.2 Format B44
Size A 542 mm
Size B 166 mm
Size C 3 mm
Size D 55 mm
Size E 25 mm
Table 3 - Sizes B44
Cut-out G 524 mm (±1)
Cut-out F 148 mm (±1)
Table 4 - Panel cut-out B44
Power
Opon 2 Opon 1
Remote keypad
Signal
CDE
A
B
F
G
Panel cut-out
(see Table 4)

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
5
1.4.3 Format B26
B
A
Power
Opon 3 Opon 2
Remote keypad
SignalOpon 1
CDE
Cable glands
Power
Slot for opon 3
Slot for opon 2
Input signal terminal
Remote keypad terminal
Slot for opon 1
Size A 436 mm
Size B 135 mm
Size C 3 mm
Size D 55 mm
Size E 25 mm
Table 5 - Sizes B26
Cut-out G 418 mm (±1)
Cut-out F 117 mm (±1)
Table 6 - Panel cut-out B26
F
G
Panel cut-out
(see Table 6)
1.4.4 Format B46
CDE
B
A
Power
Opon 3 Opon 2
Remote keypad
SignalOpon 1
Size A 740 mm
Size B 166 mm
Size C 3 mm
Size D 55 mm
Size E 25 mm
Table 7 - Sizes B46
Cut-out G 722 mm (±1)
Cut-out F 148 mm (±1)
Table 8 - Panel cut-out B46
F
G
Panel cut-out
(see Table 8)

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
6
1.5 To access the instrument
To open the housing, remove the screws from the back cov-
er. With each screw there is a metal washer and a plasc
washer. Once the screws are out, remove the back cover.
The gure below shows the instrument internal structure for
a B26 format. It shows the locaon of the 3 slots for oponal
output and control modules, the power terminal and the in-
put signal terminal.
To close the instrument, place the back cover, the screws,
the metal washer and the plasc washer. The plasc washer
is in contact with the back cover. Conrm that the screws are
correctly turning inside the internal female screws.
To ensure a correct IP65 protecon ghten the back cover
screws with a strength between 30 and 40 Ncm, with the
help of a dynamometer screwdriver.
1.6 Modular system
Large format meters from Series B are designed with an in-
ternal modular architecture. The output and control mod-
ules are independent and can be installed by accessing the
internal circuits of the instrument, and connecng the mod-
ule to the connecon jumpers of the selected slot.
Each module is provided with a cable e to x the module
to the e base. The input signal modules denes the instru-
ment funcon and are exchangeable, switching a tempera-
ture meter to an impulse counter only by replacing the input
signal module.
See secon 2. for informaon regarding the output and con-
trol opons available
To install an output and control module
(1) insert the ‘module pins’ into the
‘connecon jumpers’ in one of the
free slots
(2) place the ‘cable e’ into the ‘e
base’ and embrace the ‘module’
rmly, unl it is xed
Slot 1
Slot 2
Slot 3
Connecon jumpers
Tie base
Cable e
(1)
(2)
Module pins
Output and control module
Power
Slot for opon 1
Slot for opon 2
Input signal terminal
Remote keypad terminal
Slot for opon 3Back cover
Female turret
Waterght seal
Screw
Metal washer
Plasc washer
Observe precauons for handling ESD (elec-
trostac discharge) sensive devices
Risk of electric shock. Removing the back
cover will grant access to the internal cir-
cuits of the instrument. Operaon must be
performed by qualied personnel only.

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
7
1.7 Power connecons and protecve earth
1. Unscrew the screws from the back cover and remove the
back cover (see secon 1.5).
2. Pass the power cable through the power cable gland (see
secon 1.4).
3. Prepare the power cables so that the earth wire is 20 cm
longer than the other cables (see Figure 1).
4. Connect the earth wire to the internal xed screw ‘PE’
(see Figure 2) located at the inside of the back cover. The
instrument internally connects the back cover metallic
Phase (+)
Neutral (-)
Earth
20 cm
Figure 1 - Longer earth wire
Power cable gland
Screws
‘PE’ internal xed screw
Figure 2 - Locaon of the internal ‘PE’ xed screw and power cable gland
structure with the front metallic structure through an in-
ternal green-yellow cable. (doed cable at Figure 3).
5. Connect phase and neutral (in AC power) or posive and
negave (in DC power) to the internal power terminal.
6. The connecons label aached to the outside of the in-
strument has some free space le to write the color or
local code for each cable.
7. To comply with security regulaon 61010-1, add to the
power line a protecon fuse acng as a disconnecon
element, easily accessible to the operator and idened
as a protecon device.
Power ‘H’ 500 mA me-lag fuse
Power ‘L’ 1000 mA me-lag fuse
Power Terminal
(orange)
NL
PE
PE
fuse
Figure 3 - Power connecons
The 4 pin terminal located beside
the input signal module allows to
replicate a remote version of the
front keypad. Connect 4 cables for
front keys ‘SQ’ (<), ‘UP’ (5) and
‘LE’ (3) and for the common. Pass
these cables through the ‘remote
keypad’ cable gland (see secon
1.4) .
1.8 Connecons for remote keypad
GND
SQ
(<)
UP (5)
LE (3)
LE
UP
SQ
GND
Remote keypad RKB
(see secon 3)

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
8
Format B24 Format B44 Format B26 Format B46
Number of digits 4 4 6 6
Digit height 60 mm 100 mm 60 mm 100 mm
Reading distance 25 meters 50 meters 25 meters 50 meters
Slots for output and control opons 2 2 3 3
Maximum reading 9999 999999
Minimum reading -1999 -199999
Consumpon (without opons installed) 3 W 5.25 W 3.5 W 5.5 W
Consumpon (with opons installed) 5 W 6.75 W 5,5 W 7 W
Weight 2200 gr. 2500 gr. 3500 gr. 4500 gr.
Table 9 - Technical specicaons associated to format
Digits
number of digits 4 or 6 (see Table 9)
digit 7 segments
view angle 120º
color red or green
digit height (see Table 9)
Reading
max., min. (see Table 9)
decimal point congurable
overrange / underrange ash reading
display refresh (see Table 10)
Load cells
type of cells 1 mV/V, 2 mV/V, 3 mV/V and others
excitaon voltage congurable 5 Vdc or 10 Vdc
max. excitaon current 140 mA
Vexc. protecon against shortcircuit
(see error at secon 1.16)
max. terminals voltage 30 Vdc
number of cells* 1 to 8 load cells (power 5 Vdc)
1 to 4 load cells (power 10 Vdc)
*(values calculated for standard 350 Ohms load cells. For
cells with dierent impedance, the number is limited by the
140 mA available current)
Measure
signal ranges (see secon 1.9.2)
accuracy at 25 ºC (see secon 1.9.2)
thermal stability 100 ppm/º
input impedance 20 MOhm
acquisions / second*(see Table 10)
*(and refresh for alarms, analog output and bus)
display refresh (see Table 10)
step response (see Table 10)
0 % to 99 % signal
1.9 Technical specicaons
signal terminals plug-in screw terminals (pitch 3.81 mm)
wires secon max. 0.5 mm2
Power
power ‘H’ 85 to 265 Vac and 120 to 370 Vdc iso-
lated (isolaon 2500 Vac)
power ‘L’ 11 to 36 Vdc isolated
(isolaon 1500 Vdc)
consumpon (see Table 9)
fuses (see secon 1.7)
power terminals plug-in screw terminals (pitch 5.08 mm)
wire secon 1 to 2.5 mm2 (AWG17 to AWG14)
Conguraon front keypad with 3 keys
remote keypad (see secon 1.8)
Output and control opons relay output, analog retransmission,
Modbus RTU, ... (see secon 2)
Mechanical
IP protecon full IP65 housing
mounng panel, wall , hanging (see secon 1.20)
connecons cable gland outputs, PG9
(maximum 8 mm diameter)
housing material texturized iron, black painted
methacrylate front lter
weight (see Table 9)
front sizes (see secon 1.4)
panel cut-out (see secon 1.4)
depth (see secon 1.4)
Temperature
operaon from 0 to +50 ºC
storage from -20 to +70 ºC
warm-up me 15 minutes

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
9
Acquisions / sec. Display refresh Step response
Mode standard 16 acq. / sec. 16 refresh / sec. 63 mSec.
Mode 50 Hz 50 acq. / sec. 16 refresh / sec. 20 mSec.
Mode 60 Hz 60 acq. / sec. 16 refresh / sec. 17 mSec.
Table 10 - Technical data for the congured acquision mode
The instrument works by default with a fast acquision mode
of 16 acquisions per second, with a noise rejecon opmized
for 50 and 60 Hz frequencies. Two addional faster acquision
modes are available, opmized for noise rejecon to a single
specic frequency of 50 Hz or 60 Hz.
To opmize the noise rejecon only to 50 Hz and / or increase
the acquision speed to 50 acquisions per second, congure
the ‘Mode’ (‘ModE’) parameter to ‘50.hZ’ value. This selec-
on increases the speed to 50 acquisions per second and
increases the noise rejecon to 50 Hz, although it reduces the
noise rejecon to 60 Hz. Congure the parameter value to ‘60.
hZ’ to increase to 60 acquisions per second and maximum
rejecon to 60 Hz noise, reducing the noise rejecon for 50 Hz.
To congure the mode see secon 1.13.7.
1.9.1 Acquision modes
Signal
ranges
Accuracy Max. input
signal
0/100 mVdc 0.05% FS
30 V
0/30 mVdc 0.05% FS
0/20 mVdc 0.05% FS
0/15 mVdc 0.05% FS
0/10 mVdc 0.05% FS
0/5 mVdc 0.05% FS
Table 11 - Input signal ranges
1.9.2 Signal ranges
The instrument works with 6 internal signal ranges and the
acve range is automacally selected when the instrument
is started. The selecon depends on the value of parameters
‘Sensivity’ (‘MV.V’) and ‘Excitaon voltage’ (‘V.EXc’) (see
secon 1.13.2).
Example : with a sensivity conguraon of 2.0000 mV/V
and a congured excitaon voltage of 10 Vdc, the instru-
ment selects the 20 mV input signal range, by calculang
2 mV/V x 10 Vdc = 20 mV.
The internal signal ranges available are shown below at Ta-
ble 11.
1.9.3 Number and type of cells accepted
The instrument accepts connecon for up to 8 standard
350 Ohms load cells. With a congured excitaon voltage of
10 Vdc connect from 1 to 4 load cells. With a congured ex-
citaon voltage of 5 Vdc connect from 1 to 8 load cells. For
load cells with dierent impedance, calculate the current
consumpon for each cell, and the total must not exceed the
maximum current the instrument can provide.
In case of problems with the power or the signal provided
by the load cells, the instrument provides three funcons for
troubleshoong purposes. These funcons allow to access
the signal input value (in mV), the excitaon voltage value at
the ‘sense’ terminals (in Vdc) and the current provided to the
cells (in mA). The operator can use this values to idenfy the
cause of the problem. See secon 1.13.13 for more informa-
on on how to access this values in real me.
The instrument shows the value for the net weight, and can
be congured to switch reading to gross weight and the actual
value of the tare. The relaon between them is :
• Net weight = gross weight - tare
Operator can access these values by conguring the fast ac-
cess menu (key ‘UP (5)) (see secon 1.13.13).
1.9.4 Gross weight, net and tare
1.11 Technical specicaons (cont.)

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
10
Measuring with load cells requires a stable and accurate ex-
citaon voltage. Connecng the ‘sense +’ and ‘sense -’ termi-
nals to the load cell, provides the instrument with an accurate
value of the excitaon voltage received by the cell. Deviaons
and errors from the standard excitaon value are automa-
cally compensated by the instrument, increasing the accuracy
If you do not wish to use the ‘sense ’, place a shortcircuit be-
tween terminals ‘sense +’ and ‘Vexc+’, and between terminals
‘sense -’ and ‘Vexc-’.
For applicaons with mulple cells (2, 3, 4 cells or more) con-
nect the ‘sense ’ wires to the ‘electrical middle point’ of the
power wires of all the cells (see secon 1.19.4).
Measuring with load cells requires an electrically clean instal-
laon. When connecng the ground to the cell system, assure
that :
• the cell connecon to ground is performed in such a way
that the current to ground DOES NOT ow through the cell.
!
The ‘sense’ terminals must be always connected.
If you do not use the ‘sense’, shortcircuit with
‘Vexc’ terminals.
1. Unscrew the screws from the back cover and remove the
back cover (see secon 1.5).
2. Locate the input signal terminal (see secon 1.4).
3. Pass the signal cable through the signal cable gland (see
secon 1.4).
4. Connect the input signal cables (see Figure 4).
5. The connecons label aached to the outside of the in-
strument has some free space le to write the color or
local code for each cable.
1.10 Input signal connecons
4. Signal+
Input Signal
7654321
7. EK
6. Vexc+
5. Sense+
2. Sense-
1. Vexc-
3. Signal-
7. EK ‘on / o’ rear control (short circuit to ‘Vexc-’)
6. Vexc+ Excitaon voltage +
5. Sense+ Excitaon voltage sense +
4. Signal+ Posive signal
3. Signal- Negave signal
2. Sense- Excitaon voltage sense -
1. Vexc- Excitaon voltage -
Figure 4 - Signal connecons
Vexc+
Señal+Señal-
Sense-
Vexc-
Sense+
EK
7654321
Figure 5 - Example for connecons with 1 load cell.
1.10.1 Connecng the ‘sense’
1.10.2 Connecng the cell to the ground
1.10.3 Real cases
See secon 1.19 for dierent examples on how to connect
the load cell and congure the instrument.

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
11
1.11 ‘Tare’ funcons included
Acvate the tare funcon to force the instrument to take the
actual signal as a ‘0’ weight. The tare funcon does not mod-
ify the internal calibraon of the cell, and can be acvated as
many mes as needed. The tare funcon is typically used to
set a ‘0’ reading when a xed weight has been added to the
load cell.
Example : a truck enters a loading area and is placed on a
weighing system. The instrument indicates that the weight
of the truck is 2.500 Kg. A tare is applied to the instrument,
and now the reading is 0 Kg. The truck enters the loading
area and when it leaves, if is placed on the weighing system
again. Now the reading is 1.550 Kg. This is the weight of
the material loaded on the truck. When the truck leaves the
weighing system the instrument reads -2.500 Kg. Acvate a
tare again to force a reading of 0 Kg or wait for a new truck.
The instrument accepts dierent ways to acvate the tare
funcon:
• from the rear terminal, shortcircuit the ‘EK’ terminal
against the ‘Vexc-’ terminal. Previously, congure the ‘EK’
terminal with the tare funcon (see secon 1.13.11).
• from the front keypad, press the front key ‘LE’ (3). Previ-
ously, congure the ‘LE’ (3) key with the tare funcon (see
secon 1.13.12).
• automacally when the instrument starts. Previously, con-
gure the ‘on power-up’ funcon with the tare funcon (see
secon 1.13.14).
• automacally with the ‘auto-tare’ funcon. The inherent
mechanical characteriscs of a load cell makes the ‘zero
weight’ signal a non constant value. This can be detected
by placing and removing the same weight from a load cell,
several mes. When the weight is removed, the reading is
not always ‘0’, but a random value close and around ‘0’. The
‘auto-tare’ funcon automates the acvaon of the ‘tare’
when the reading of the instrument is stable and close to ‘0’
(see secon 1.13.4).
To avoid accidental tares, the instrument provides the ‘Max.
Tare’ (‘MAX.t’) parameter. The acvaon of the ‘tare’ func-
on, either manual or automac, is not applied if the reading
is higher than the value dened in this parameter (see secon
1.13.7).
The actual tare value can be accessed from the front key ‘UP’
(5) acvang the ‘Tare’ funcon at the ‘Key UP’ menu (see
secon 1.13.15). A reset to the tare value can be applied also
from this same menu.
1.12 Funcons included
Included funcons Secon
Funcon tare yes 1.11
Auto-tare automac zero tare 1.13.4
Maximum tare to prevent undesired
tare acvaons 1.13.7
Scale factor change the reading
scale 1.13.5
Stock of units counts units instead of
weight 1.13.6
Modes high rejecon to 50 Hz
and 60 Hz 1.9.1
Alarms
standard
stability alarms
double setpoint
acvaon delays
deacvaon delays
hysteresis
inverted relay
locked deacvaon
1.13.8
Display lters
xed digits
recursive
‘steps’
le zeros
1.13.10
Rear controls acvate funcons
from rear terminal 1.13.11
Front key ‘LE’ (3)acvate funcons
from key ‘LE’ (3)1.13.12
Fast access (key ‘UP’
(5))
fast access to param-
eters from front key
‘UP’ (5)
1.13.13
On power-up acvate funcons at
power up 1.13.14
Memory maximum and mini-
mum 1.13.13
Password blocks access to con-
guraon menu 1.13.17
Troubleshoong func-
ons
values for input signal,
excitaon voltage and
excitaon current
1.13.13
Display brightness 5 levels 1.13.17
Table 12 - Funcons included

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
12
Empty page

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
13
The instrument has two menus accessible to the user :
‘Conguraon menu’ (key ‘SQ’) (<)
‘Fast access’ menu (key ‘UP’) (5)
Conguraon menu
The ‘conguraon menu’ modies the conguraon param-
eters to adapt the instrument to the applicaon needs. To
access the ‘conguraon menu’ press for 1 second the ‘SQ’
(<) key. This access can be blocked by acvang the ‘Pass-
word’ (‘PASS’) funcon. While operang the ‘conguraon
menu’, the alarm status is ‘hold’ to the status it had before
accessing the menu, and the output and control modules re-
main in ‘error’ state. When leaving the ‘conguraon menu’,
the instrument applies a system reset, followed by a brief
disconnecon of the alarms and the output and control
modules. Funconality is then recovered.
For a detailed explanaon on the ‘conguraon menu’ see
the following secons, and for a full view of the ‘congura-
on menu’ see secon 1.14.
‘Fast access’ menu
The ‘fast access’ menu is an operator congurable menu,
providing fast and direct access to the most usual funcons
of the instrument with a single key pad stroke. Press key ‘UP’
(5) to access this menu.
See secon 1.13.17 for a list of selectable funcons for the
‘fast access’ menu in this instrument. The ‘Password’ (‘PASS’)
funcon does not block access to this menu. Accessing and
modifying parameters in the ‘fast access’ menu does not in-
terfere with the normal funconality of the instrument, and
it does not generate any system reset when validang the
changes.
Operang with the front keypad inside the menus
Key ‘SQ’ (<) - press the ‘SQ’ (<) key for 1 second to access
the ‘conguraon menu’. Inside the menu, the ‘SQ’ (<) key
acts as an ‘ENTER’. It enters into the menu opon selected,
and when entering a numerical value, it validates the num-
ber.
Key ‘UP’ (5) - press the ‘UP’ (5) key to access the ‘fast ac-
cess’ menu. Inside the menu,the ‘UP’ (5) key sequenally
moves through the available parameters and menu entries.
When entering a numerical value, it modies the digit se-
lected by increasing its value to 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
1.13 Conguraon
1.13.1 How to operate the menus
Key ‘LE’ (3) - press the ‘LE’ (3) key to acvate the cong-
ured special funcons associated to this key. Inside the menu,
the ‘LE’ (5) acts as an ‘ESCAPE’. It leaves the selected menu
level and eventually, by leaving all menu levels, it leaves from
the conguraon menu. Then changes are applied and the
instrument is back to normal funcon. When entering a nu-
merical value, it selects the acve digit, and the value is then
modied by key ‘UP’ (5).
‘Rollback’
Aer 30 seconds without interacon from the operator, the
instrument will rollback and leave the ‘conguraon menu’
or the ‘fast access’ menu. All changes will be discarded.
Instruments with 4 and 6 digits
The conguraon menus included in this document show
values for a 6 digit instrument. In case of 4 digit instruments,
note that maximum reading values should be 9999 instead
of 999999 to 9999 and minimum reading values should be
-1999 instead of -199999.
(2)
(3)
(3)
(3)
(3)
(3)
(4)
(4)
(4)
(4)
(5)
(5)
(5)
(5)
(3)
(3)
(6)
(6)
(1)
Example of operaon inside
the ‘conguraon menu’.
1. The (<) key enters into the
‘conguraon menu’.
2. The (<) key enters into the
‘InP’ menu.
3. The (5) key moves through
the menu opons.
4. The (<) key selects the de-
sired range and returns to
the ‘InP’ menu.
5. The (3) key leaves the ac-
tual menu level and moves
to the previous menu level.
6. The (3) key leaves the ‘con-
guraon menu’. Changes
are applied and saved at
this moment.
Figure 6 - Example of operaon inside the ‘conguraon menu’

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
14
1.13.2 Inial set-up
Before starng to congure the instrument, idenfy the pa-
rameters of the load cell, at the manufacturers datasheet (see
Table 13). If the parameters are not know, leave the instru-
ment with the default values.
Load cell
parameters
Default values
Sensivity 2 mV/V
Nominal weight 1000 Kilos
Excitaon voltage 10 Vdc
Table 13 - Parameters of the load cell
For an accurate measure, the instrument needs to correctly
congure its parameters for the parcular load cell connect-
ed. The conguraon procedure has a rst theorecal step
and a second empirical step. The third and nal step will set
the ‘system zero’ of the instrument.
Theorecal conguraon of the load cell
The theorecal parameters are congured at the ‘Parameters
of the cell’ (‘cELL’) menu.
• at the ‘Decimal point’ (‘dP’) parameter, place the decimal
point according to the resoluon you want to see.
• at the ‘Nominal weight’ (‘LoAd’) parameter introduce the
nominal weight of the load cell. The value is entered with the
resoluon congured in the parameter above.
• at the ‘Sensivity’ (‘MV.V ’) parameter, introduce the value
of the cell sensivity.
• at the ‘Excitaon voltage’ (‘V.EXc’) parameter, select 5 or
10 Vdc. (The ‘LAb’ value enables the laboratory mode, for di-
rect measure from a millivolt generator instead of a load cell
(see secon 1.19.5)).
Example : load cell with 1.95 mV/V sensivity and a nominal
value of 5 Kg and power 5 Vdc. To read in grams with a deci-
mal point, congure the theorecal parameters as indicated
below :
Decimal point : XXXXX.X
Sensivity : 1.95 mV/V
Nominal weight : 5000.0
Excitaon voltage : 5 Vdc
When the theorecal values are congured, leave the cong-
uraon menu. Apply a ‘system zero’. Force a tare, and place
dierent weights to check if the reading is correct. If it is not
correct, apply the empirical conguraon and again the ‘sys-
tem zero’.
Empirical conguraon of the load cell
The second part of the load cell conguraon is an empiri-
cal process of eld correcon. The instrument will detect and
correct the individual deviaons of this parcular load cell.
For the empirical conguraon you will need access to two
weights : a low weight, as small as possible (it can be the cell
without weight) and a high weight as close as possible to the
nominal weight of the cell.
In each case the meter will be informed of the real weight
applied to the cell in order to correct and compensate for the
measured deviaons at the signal. Both correcons are need
(high and low) for a correct conguraon of the load cell.
• low weight correcon : place the load cell without weight
or with the smallest weight possible, and access the ‘Low
weight correcon’ (‘F.Lo’) menu. Press key SQ (‘<’), intro-
duce the value of the weight and press again SQ (‘<’). The
instrument will ash shortly and return to the menu entry
‘Low weight correcon’ (‘F.Lo’).
• high weight correcon : place the load cell with a weight
closest to nominal and access the ‘High weight correcon’
(‘F.hI’) menu. Press key SQ (‘<’), introduce the value of the
weight and press again SQ (‘<’). The instrument will ash
shortly and return to the menu entry ‘High weight correc-
on’ (‘F.hI’).
Once both correcons are applied, leave the conguraon
menu. Force a tare, and place dierent weights to check that
the reading is correct. As a last step, assign the ‘system zero’ if
you want to access gross weight and net values.
Assign the ‘system zero’
This is a necessary and important step for a correct measure-
ment with a load cell.
• assign the ‘system zero’ : place the load cell without weight
or with the weight that will be considered as ‘zero’ and access
the ‘System zero’ (‘S.ZEr’) parameter. Press key SQ (‘<’). The
instrument will ash shortly and return to the menu entry
‘System zero’ (‘S.ZEr’).
The empirical conguraon of the load cell recalcu-
lates and updates the theorecal sensivity value
(‘Sensivity mV/V’ (‘M V.V’) parameter). Manual
modicaons of this parameter will modify the congura-
on of the cell. To prevent accidental modicaon con-
sider the acvaon of the ‘password’ funcon (see secon
1.13.17).
!
Once the load cell has been correctly congured,
and the reading of the instrument is correct, it is not
necessary to access again this part of the congura-
on menu. If you need to scale the reading to dierent units,
use the ‘Scale factor’ (‘ScL.F) parameters at the ‘Advanced
conguraon’ menu (see secon 1.13.17).
!

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
15
Press ‘SQ’ (<) for 1 second to access the ‘conguraon
menu’. For a descripon on how to operate inside the
menus see secon 1.13.1. For a full vision of the ‘con-
guraon menu’ structure see secon 1.14.
At the inial set up of the instrument, rst congure the
theorecal part of the load cell at the ‘Load cell parameters’
(‘cELL’) menu and later congure the empirical part of the
load cell at the ‘Field correcon’ (‘F.cor’) menu. See secon
1.13.2 for addional informaon.
• at the ‘Decimal point’ (‘dP’) parameter, select the decimal
point posion. Move the decimal point with key ‘LE’ (3).
The posion dened will be used for all reading parameters.
Example : to read in ‘Kg’ with tenths of kilograms, place the
decimal point at ‘XXXXX.X’ and the reading will be always
be shown with 1 decimal.
Changing the posion of the decimal point will only light a
dierent decimal point led, but will not modify or re-scale
the measure of the instrument.
• at the ‘Sensivity mV/V’ (‘MV.V ’) parameter, congure the
value for the load cell sensivity. Accepts any value between
0.0001 and 99.9999 mV/V. Default value is 2.0000 mV/V.
• at the ‘Nominal weight’ (‘LoAd’) parameter, congure the
nominal weight of the load cell. accepts any value between
0 and 999999. The decimal point will be shown in the posi-
on congured at the ‘Decimal point’ (‘dP’) parameter. De-
fault value is 1000.
Example : for a 5 Kg cell, congure a value of 5000 to read
in grams.
• at the ‘Excitaon voltage’ (‘V.Exc’) parameter, congure
the voltage to power the load cell. Select ‘5 Vdc’ or ‘10 Vdc’.
Default value is 10 Vdc. Select ‘LAb’ for a millivolt meter
mode in laboratory (see secon 1.19.5).
The ‘Field correcon’ (‘F.cor’) menu includes the funcons for
the empirical conguraon of the load cell. See secon 1.13.2
for addional informaon on each funcon.
• at the ‘Low weight correcon’ (‘F.Lo’) parameter, intro-
duce the real value of the actual weight at the cell. Use the
lowest weight possible, close to 0. Press key SQ (‘<’) to
start the correcon process.
• at the ‘High weight correcon’ (‘F.hI’) introduce the real
value of the actual weight at the cell. Use the lowest weight
possible, close to nominal weight of the cell. Press key SQ
(‘<’) to start the correcon process.
The ‘System zero’ (‘S.ZEr’) entry assigns the actual weight to
the ‘system zero’ of the instrument. Values for ‘gross weight’
and ‘tare’ are relave to this weight. See secon 1.13.2 for
addional informaon.
1.13.3 Inial setup menu
Load cell
parameters
Inial congu-
raon
Decimal point
Sensivity
mV/V
Nominal weight
Excitaon
voltage
5 Vdc
10 Vdc
Field correc-
on
High weight
correcon
Low weight
correcon
Low weight
value
High weight
value
System zero
Laboratory
mode

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
16
1.13.4 Funcon ‘auto-tare’
The ‘auto-tare’ funcon automacally acvates the ‘tare’
when the weight is removed from the load cell. The ‘auto-
tare’ conguraon has three parameters :
• Acvaon value : the ‘auto-tare’ funcon acvates when
reading is lower than the dened value.
• Stability band: reading must be stable, and its uctuaon
must be lower than the number of counts dened in this pa-
rameter.
• Stability me : reading must be within the stability band for
the me dened in this parameter.
When these three parameters are met (the system is ‘without
weight’ and the reading is ‘stable’) the ‘auto-tare’ funcon au-
tomacally acvates the ‘tare’.
Example : weighing system with reading from 0.0 to 2500.0
Kg. When weight is removed from the system, there is al-
ways a variable remnant value : 2.2 Kg, 3.1 Kg, -0,7 Kg, ...
This remnant value is associated to the specic imperfecons
of each load cell. Also this remnant value takes some me to
stabilize, approximately 1 second. A manual tare can be ap-
plied each me the load cell is unloaded in order to correct
this error. The ‘auto-tare’ funcon will correct it automa-
cally without operator intervenon, conguring the follow-
ing parameters.
•acvaon value = 5.0
•stability = 1.0
•stability me = 2 seconds
When reading is lower than ‘5.0’, the ‘auto-tare’ system ac-
vates, and it will analyze the stability of the signal. When
reading does not change more than ±1.0 counts for a me of
2 seconds, the tare will automacally acvate.
The ‘auto-tare’ funcon is aected by the ‘Maximum tare’
(‘MAX.t’) parameter. The instrument will not accept the ac-
vaon of the tare when reading is higher than the ‘Maximum
tare’ (‘MAX.t’) value.
The ‘Scale factor’ (‘ScL.F’) congures a xed mulplier to ap-
ply to the reading.
Example: a weighing system is congured to read in Kg, but
the system is going to be shipped to an area where measure
must be in pounds. The relaon between kilograms and
pounds is: 1 Kg = 2,20462 pounds. Within the scale factor,
congure the mulplier to 220462 and the divider to 100000.
The instrument is now congured to read in ‘pounds’.
The ‘Stock units’ (‘Stck’) funcon is provided to count large
quanes of small units, in situaons such as stock invento-
ry, recepon of goods, etc. The operator must congure the
number of ‘units’ assigned to a weight. The instrument will
measure the weight but will show the number of ‘units’.
To congure the ‘Stock units’ funcon, weight a known num-
ber of units. Then introduce the number of units, either from
the conguraon menu (‘Advanced conguraon’ \ ‘Stock
units’) or from the fast access menu (key ‘UP’ (5)).
Example from the conguraon menu : place 50 units on the
load cell, and check that the instrument is weighing correctly.
Enter the conguraon menu, and at the ‘Stock units’ (‘Stck’)
parameter, within the ‘Advanced conguraon’, introduce
‘50’ as the number of units. Save the value (key ‘SQ’ (<))
and leave the conguraon menu (key ‘LE’ (3) two mes).
The instrument restart and reads 50 units. Add more units
and observe that the reading increases proporonally to the
number of units.
Example from the front key ‘UP’ (5) : congure the func-
on ‘Stock units’ to be accessible from the front key ‘UP’ (5)’
(fast access menu) (see secon 1.13.13) and leave the con-
guraon menu. Place 50 units on the load cell, and check
that the instrument is weighing correctly. Access the param-
eter ‘Stock units’ through the front key ‘UP’ (5), and cong-
ure the number of units actually on the load cell (50 units).
Save the value (key ‘SQ’ (<)) and leave the fast access menu
(key ‘LE’ (3)). The instrument reads 50 units. Add more units
and observe that the reading increases proporonally to the
number of units
In both cases, seng a value to the ‘Stock units’ (‘Stck’) pa-
rameter assigns the value to the actual weight. The actual val-
ue of units (‘Stock units’ (‘Stck’) parameter) can be assigned
to the actual weight by pressing front key ‘LE’ (3) (see secon
1.13.12) and/or acvang the rear terminal ‘EK’ (see secon
1.13.11).
Assign the value ‘0’ to the ‘Stock units’ (‘Stck’) parameter to
disable this funcon and return to normal reading of weight.
1.13.5 Scale factor
1.13.6 Funcon ‘stock’

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
17
At the ‘Auto-tare’ (‘Aut.t’) menu congure the acvaon val-
ue and stability values to control the automac acvaon of
the tare, when weight is removed from the cell. See secon
1.13.4 for addional informaon.
• at the ‘Acvaon value’ (‘SEt’) parameter, congure the
working limits for the ‘auto-tare’. The ‘auto-tare’ only ac-
vates for lower values of reading. Accepts any value be-
tween 0 and 999999. Default value is 10.
• at the ‘Stability band’ (‘bAnd’) parameter, congure the
number of counts allowed to consider a signal ‘stable’. The
‘auto-tare’ only acvates if the reading uctuates within this
band of counts. Accepts any value between 0 and 999999.
Default value is 10.
• at the ‘Stability me’ (‘tIME’) parameter, congure the
minimum me, in tenths of second, for the signal to be
within the stability band to consider it ‘stable’. Accepts any
value between ‘0.0’ and ‘99999.9’. Default value is ‘0.0’.
Value 0 at the stability band and/or 0.0 at the stability me,
disable the ‘auto-tare’ funcon.
The tare is automacally acvated when reading is lower
than the acvaon value, and the uctuaon of the reading
is lower than the counts dened at the ‘stability band’ for
the me dened at the ‘stability me’.
At the ‘Maximum tare’ (‘MAX.t’) parameter, congure the
maximum value of reading to allow for a tare to be applied.
See secon 1.13.4 for addional informaon. Accepts any val-
ue between 0 and 999999. Default value is 999999.
At the ‘Scale factor’ (‘ScL.F’) parameter, congure the value
for the mulplier and the divider. See secon 1.13.5 for addi-
onal informaon. Accepts any value between 0 and 999999.
Default value is 1.
At the ‘Stock units’ (‘Stck’) parameter, congure the number
of units for the actual weight. See secon 1.13.6 for addional
informaon. Accepts any value between 0 and 999999. De-
fault value is 0 (funcon disabled).
At the ‘Mode’ (‘ModE’) parameter, congure the acquision
mode. See secon 1.9.1 for addional informaon. Default
value is ‘Standard’ (‘Std’).
Stability me
Auto-tare
Stability band
Acvaon value
Maximum tare
Advanced conf.
Scale factor
Divider
Mulplier
Standard
Mode
60 Hz
50 Hz
Stock units Units
1.13.7 Advanced conguraon menu

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
18
1.13.8 Alarms
The instrument manages 3 independent internal alarms, each
one controlling the acvaon of an oponal relay, transistor
or SSR control output.
Oponal modules (see secon 2) are installed at the free slots
inside the instrument (see secon 1.6). B24 and B44 formats
have 2 free slots for output and control modules, while B26
and B46 formats have 3 free slots for output and control mod-
ules (see secon 1.4).
The instrument has 3 front leds that reect the state of the 3
internal alarms. These leds are only for local help during instal-
laon, as they are not appropriate for long distance reading.
Each alarm controls the acvaon of the relay, transistor or
control SSR installed on its associated slot, and the front led.
• Congurable parameters
Each alarm has several conguraon parameters, starng
with the usual setpoint, hysteresis and maximum (alarm
acve when reading is higher than setpoint) or minimum
(alarm acve when reading is lower than minimum) alarm
types (see Figure 7).
• Acvaon and deacvaon delays
Each alarm can congure independent acvaon and deac-
vaon delays. These delays aect the alarm as a whole, and
the delay will aect the front led and the associated relay.
• Stability acvaon
The stability acvaon delays the alarm acvaon unl the
reading is stable (see Figure 8).
Applicaon : the lling of a tank with liquid is controlled with
a load cell. Upon reaching 5000 liters, the alarm 1 acvates to
stop the lling pump. Aer the pump has stopped, the liquid
is sll moving inside the tank, and this movement is reected
in weight and reading oscillaons. Alarm 2 is congured as
‘stability alarm’ and acvates when the liquid inside the tank
is at rest. At this moment, the tank can be removed safely.
• Second setpoint
Conguring a second setpoint creates ‘windowed alarms’.
The windowed alarm controls with a single relay output if
the reading is inside or outside the values dened (see Fig-
ure 9).
• Inverted relay
Acvate the ‘inverted relay’ funcon to invert the acvaon
logic of the associated relay.
• ‘Locked alarms’
Acvate the ‘locked alarms’ funcon to force the operator to
interact with the instrument when an alarm has acvated.
Once acvated, the alarm will remain locked at acve state,
even if the reading returns to a value below setpoint, unl
the operator manually unlocks the alarms by pressing the
front key ‘LE’ (3).
Reading
t
setpoint
hysteresis
Alarm as maximum, no
hysteresis and no delays
on
o
acvaon
delay
on
o
deacvaon
delay
Alarm as maximum, with
hysteresis and delays
on
o
Alarm as minimum , no
hysteresis and no delays
t
t
t
Figure 7 - Examples of alarms with 1 setpoint
Reading
t
Set points 1 and 2
Alarm 2 as maximum with
stability.
on
o t
Alarm 1 as maximum.
on
o t
AL1
AL2
5000
Figure 8 - Example of alarm with stability
Reading
t
Set point 2
Set point 1
Alarm as minimum, with
double setpoint, no hyster-
esis and no delays
on
o t
Figure 9 - Example of alarm with double setpoint

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
19
Alarm 1
Setpoint
Hysteresis
Acve
Type of alarm
Setpoint 2
Alarms
Acvaon
delay
Deacvaon
delay
Inverted relay
Locked alarm
Stability Stability band
Stability me
Alarms 1, 2 and 3 are congured from menu ‘ALr1’, ‘ALr2’ or
‘ALr3’. See secon 1.13.8 for addional informaon.
• at the ‘Acve’ (‘Act’) parameter select ‘on’
• at the ‘Type of alarm’ (‘TypE’) parameter, select ‘MAX’ for
maximum alarm (acvates when reading is higher than set-
point), or ‘MIn’ for minimum alarm (acvates when reading
is lower than setpoint).
• at the ‘Setpoint’ (‘SEt’) parameter, congure the alarm
acvaon point. Value accessible through the ‘fast access’
menu (see secon 1.13.13).
• at the ‘Hysteresis’ (‘hySt’) parameter, select the hysteresis
value. Hysteresis applies to the alarm deacvaon. Alarm
deacvates once the reading is beyond the setpoint plus the
hysteresis value. Hysteresis prevents relay switching in case
of signal uctuaons close to the setpoint value.
• at the ‘Acvaon delay’ (‘dEL.0’) parameter, congure the
delay to apply before the alarm is acvated. Delay starts to
count once the setpoint is reached. Value from 0.0 to 99.9
seconds.
• at the ‘Deacvaon delay’ (‘dEL.1’) parameter, congure
the delay to apply before the alarm is deacvated. Delay
starts to count once the setpoint is reached plus the hyster-
esis value. Value from 0.0 to 99.9 seconds.
• at the ‘Stability’ (‘StbL’) parameter, congure the condi-
ons to detect stability at the signal and acvate the alarm.
Value ‘0’ at ‘stability band’ or at ‘stability me’ deacvate
the stability control of the alarm.
- at the ‘Stability band’ (‘bAnd’) parameter, congure the
number of counts that the reading can change and sll be
considered stable. Values from 0 to 999999. Default is 10.
-at the ‘Stability me’ (‘tIME’) parameter, congure the
me, in tenths of second, that the reading must be within
the ‘stability band’ to be considered stable.
Values from 0.0
to 99999.9. Default is 0.0.
• to work with ‘windowed alarms’ congure ‘Setpoint 2’
(‘SEt2’) to ‘on’ and congure the value for the second set-
point. The second setpoint must always be higher than the
rst setpoint.
• at the ‘Inverted relay’ (‘r.Inv’) parameter, congure ‘on’
to invert the acvaon of the relay. Relay is inacve when
alarm is acve, and relay is acve when alarm is inacve.
• at the ‘Locked alarm’ (‘A.Lck’) parameter, congure ‘on’
to block the automac alarm deacvaon. Alarm deacva-
on must be performed manually, by pressing the front key
‘LE’ (3) (see secon 1.13.12) or rear control (see secon
1.13.11).
1.13.9 Alarm conguration

FEMA ELECTRÓNICA . SERIES B . Models Bxx-LC
20
1.13.10 Display lters
The instrument provides several funcons to act upon the
reading in order to increase stability, reduce noise and adapt
to parcular needs. These funcons are grouped under the
‘Display’ (‘dISP’) menu and are explained below :
• the ‘Fixed digits’ (‘FIX.d’) funcon allows to x each digit
to a xed value. Typically, one or more right digits are xed
to ‘0’. Fix digits starng from the right. Value ‘-’ indicates that
the digit is not xed.
• the ‘Average lter’ (‘AVr’) applies a recursive lter upon
the reading values, in order to reduce oscillaons due to
noisy signals. Congure the lter strength between ‘0’ and
‘100’. The lter is stronger with higher values. Increasing the
strength of the lter slows the reading. Value ‘0’ disables the
lter.
• the ‘Steps’ (‘StEP’) funcon congures the reading to be
done in steps of 1, 2, 5, 10, 20 or 50 counts.
Example: congure a step of 20 and the reading will change
in steps of 20 counts (‘1420’, ‘1440’, ‘1460’, ...).
• the ‘Le zero’ (‘LZEr’) funcon lights all zeros to the le.
• the ‘Memory of maximum’ (‘MAX’) displays the maximum
reading stored on memory. To reset this memory, select the
‘rSt’ input. The value can be accessed through the ‘fast ac-
cess’ menu at front key ‘UP’ (5) (see secon 1.13.13).
• the ‘Memory of minimum’ (‘MIn’) displays the minimum
reading stored on memory. To reset this memory, select the
‘rSt’ input. The value can be accessed through the ‘fast ac-
cess’ menu at front key ‘UP’ (5) (see secon 1.13.13).
Le zeros
Steps
Average lter 0 to 100
Display Fixed digits Fix digits
Memory of
maximum
Memory of
minimum