HBM ME50S6 User manual

A0260-1.1 en
4.8 kHz CF Measuring
Amplifier
ME50S6
Operating manual

3
ME50S6
HBMA0260-1.1 en
Contents Page
Safety instructions 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Measuring Amplifiers on Eurocards ME50S6 8. . . . . . . . . . . . . . . .
2 Electrical Connection 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Transducer Connection 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Supply Voltage 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Output 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Supply Voltage for Additional Units 10. . . . . . . . . . . . . . . . . . . . .
2.5 Pin Assignment 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Putting into Operation 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Select Measuring Range 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Bridge Zero Balancing 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 MR Fine Adjustment 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Individual Settings 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Operational Setting 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Setting the Measuring Range 14. . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 External Fine Balancing of the MR1 15. . . . . . . . . . . . . . . . . . . .
4.4 Bridge Fine Balancing 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5 Calibration Signal 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6 Measuring Frequency Range / Cut-off Frequency fco 16. . . . .
4.7 Synchronization 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Options 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 Stabilized Power Supply 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 DC-DC Converter 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3 Current Output Module 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4 Safety Barriers for use in Hazardous Areas 19. . . . . . . . . . . . . .
5.5 Additional Units 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 General Notes 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Disturbances 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Technical Data 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Component Layout 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 Copy of Declaration of Conformity 24. . . . . . . . . . . . . . . . . . . . . . . . . .

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HBM A0260-1.1 en
Safety instructions
In order to ensure sufficient immunity from disturbance only use Greenline
shielding (see HBM’s special publication ”Greenline” Screening Concept, elec-
tromagnetic compatibility of measuring cable, G36.35.0)
The connection lines’ ( ≤50 V) minimum insulation strength must be
350 V (AC).
Appropriate use
The ME50S6 with the connected transducers may be used for measurement
and directly related control and regulation tasks, only. Any other use is not ap-
propriate.
To ensure safe operation, the ME50S6 may only be used according to the
specifications given in this manual. When using the transducer, the legal and
safety regulations for the respective application must also be observed. The
same applies if accessories are used.
General dangers in the case of non-observance of the safety instruc-
tions
The ME50S6 complies with the state of the art and is operationally reliable. If
the device is used and operated inappropriately by untrained personnel, resid-
ual dangers might develop.
Any person charged with device installation, operation, maintenance or repair
must in any case have read and understood the operating manual and the
safety instructions, in particular.
Conditions on site
Protect the device from moisture or atmospheric influences such as rain,
snow, etc.

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ME50S6
HBMA0260-1.1 en
Maintenance and cleaning
The Clip Electronic are maintenance-free. Please note the following points
when cleaning the front panel:
•Remove the mains plug from the socket before cleaning.
•Clean the front panel with a soft, slightly damp (not wet!) cloth. Never use
solvents, since they may damage the labelling on the front panel.
•When cleaning, please ensure that no liquid finds its way into the device or
onto the contacts.
Residual dangers
The ME50S6 scope of performance and supply covers part of the measuring-
technology, only. The plant designer/constructor/operator must in addition de-
sign, realise and take responsibility for the measuring-system’s safety such
that potential residual dangers are minimized. The respective regulations
must in any case be observed. Residual dangers regarding the measuring
system must be specified explicitly.

6ME50S6
HBM A0260-1.1 en
If there is any risk of remaining dangers when working with the, it is pointed
out in this introduction by means of the following symbols:
Symbol: DANGER
Meaning: Maximum danger level
Warns of a decidedly dangerous situation in which failure to comply with
safety requirements can lead to death or serious physical injury.
Symbol: WARNING
Meaning: Possibly dangerous situation
Warns of a potentially dangerous situation in which failure to comply with
safety requirements can lead to death or serious physical injury.
Symbol: CAUTION
Meaning: Dangerous situation
Warns of a possibly dangerous situation in which failure to comply with safety
requirements can cause damage to property or lead to some form of physical
injury.
Symbols indicating application notes and useful information:
Symbol: NOTE
Means that important information about the product or its handling is being
given.
Symbol:
Meaning: CE mark
The CE mark is a guarantee by the manufacturer that his product meets the
requirements of the relevant EG Directives (see declaration of conformity at
the end of these operating instructions).

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ME50S6
HBMA0260-1.1 en
Safe operation
Do only quit error messages if the reason for the error has been eliminated
and there is no more danger.
Reconstruction and modifications
HBM’s express consent is required for modifications regarding the ME50S6
construction and safety. HBM does not take responsibility for damage result-
ing from unauthorized modifications.
In particular, repair and soldering works on the boards are prohibited. If com-
plete componentry is replaced use original HBM components, only.
Qualified personnel
The device may be used by qualified personnel, only; the technical data and
the special safety regulations must in any case be observed. When using the
device, the legal and safety regulations for the respective application must
also be observed. The same applies if accessories are used.
Qualified personnel means: personnel familiar with the installation, mounting,
start-up and operation of the product, and trained according to their job.
Maintenance and repair work on an open device with the power on should
only be undertaken by trained personnel who are aware of the above-men-
tioned dangers.

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HBM A0260-1.1 en
1 Measuring Amplifiers on Eurocards ME50S6
The Eurocards ME50S6 are 4.8KHz carrier frequency measuring amplifiers
for strain gauge transducers.
All plug-in cards are delivered without housing or rack frame and without
power supply unit so that an individual setting in an existing 19” rack mounting
system is possible. Owing to the narrow width of the plug-in cards (4 divs =
20.32mm) up to 21 cards can be inserted into a 19” rack. The dimensions and
connecting details correspond to the IEC standards 48D and 297.
All controls necessary for easy operation are accessible from the front.
Individual adjustments are described in chapter four; ex-works settings are
specified on the back of the Eurocard.
Notes for the diagram on the right
S21:
calibration −measuring −zero
S22/23:
zero balancing (coarse)
S24/1+2:
MR1 fine balancing internal/ex-
ternal
S24/3:
switch for measuring frequency
range 60 Hz to 2 Hz
S24/4:
MR changeover from MR1 to
MR2
S25:
alteration to bridge supply vol-
tage
S26/27:
setting of measuring range
(coarse)
P21/22:
fine balancing of MR
P23:
zero balancing (fine)
1c
7c
8c
9c
26c
21c
24c
21a
25a
25c
30c
30a
32c
32a
28a
28c
31a+c
6c
7a
15c
4a
5a
15a
16a
19c
18c
19a
20a
11c
St 21
chassis
MR1
fine balancing
external
zero balancing
external
zero
calibr.
MR1−2
+14.5...15.5V
−14.5...15.5V
+
−
option DC/DC-con-
verter
Ub +14.5...+15.5V
Ub −14.5...−15.5V
Ua ±10V >5kOhm
option Ia ±20mA
2.33V synchr.-vol-
tage
or synchr. input
5kOhm
50kOhm
wh
rd
gy
bk
bu
gn
G

4.8kHz
S25
5V/1V
S26/27 S22/23
P23
S21
Cal. 1mV/V
zero

0..250Hz
0..40Hz
S24/4
S24/1+2
S24/3
P21/22
Fig. 1.1: Block diagram

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HBMA0260-1.1 en
2 Electrical Connection
2.1 Transducer Connection
Strain gauge transducers are connected by means of 6-wire circuits.
measuring signal(−) pin 30a. . . . . . .
sensing line to 32a(−) pin 32c. . . . .
bridge supply voltage(−) pin 32a. . .
measuring signal (+) pin 30c. . . . . .
bridge supply voltage (+) pin 28a. .
sensing line to 28a (+) pin 28c. . . .
screen pins 31a+c. . . . . . . . . . . . . . . . . .
(alternatively 29a+c)
contact rd
bk
wh
bu
gn
ye
gy
Fig. 2.1: Bridge connection
The required bridge supply voltage is 5 V(symmetrical about ground) as set
ex-works. It can be reduced to 1.0 V by switch S25.
UBBridge resistance Switch S25
5 V
(ex-works setting) RB≥110...4000 Ω
1 V RB≥60...4000 Ω
The safety barriers SD01 must be wired into the connecting lines (see chapter
5.4) for transducers in EEx(i) design.

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HBM A0260-1.1 en
2.2 Supply Voltage
+14.5...+15.5 V (max.70 mA) . . . . . . . . . . . . . .
−14.5...−15.5 V (max.65 mA) . . . . . . . . . . . . . .
operating voltage zero . . . . . . . . . . . . . . . . . . .
The ripple on the supply voltage should not exceed 0.1 V peak-to-peak. The
supply connections are internally protected against reverse polarity. Single
sided connection of the supply voltage should be avoided. The supply voltage
should be kept as low as possible within the permissible range of
"15.6..."25 V in order to maintain the dissipation at a low value.
If a stabilized voltage is not available, the measuring amplifier can be oper-
ated by means of a stabilized power supply or a DC-DC converter (see chap-
ter 5.1 and 5.2).
2.3 Output
Output voltage: "10 V; RL≥5 kΩ . . . . . . . . . .
Operating voltage zero . . . . . . . . . . . . . . . . . . .
The output is provided for the connection of a display and/or recorders. A cur-
rent output can be generated optionally (see chapter 5.3).
2.4 Supply Voltage for Additional Units
Stabilised voltages are available for supplying additional units:
+14.5V...+15.5 V; <50 mA . . . . . . . . . . . . . . . .
−14.5V...−15.5 V; <50 mA . . . . . . . . . . . . . . . .
operating voltage zero . . . . . . . . . . . . . . . . . . .
pin15a
pin16a
pin19c
+
pin18c
pin20a
±
+
pin6c
pin7a
pin15c
−
−

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HBMA0260-1.1 en
2.5 Pin Assignment
64-pin right angle plug
1c housing
2c not occupied
3c not occupied
4c not occupied
5c not occupied
6c output Uadd.=+14.5...+15.5 V; <50 mA
7c MR1 external fine balance (R=5 kOhm)
8c MR1 external fine balance. tap
9c MR1 external fine balance (R=5 kOhm)
10c not occupied
11c not occupied
12c input synchronization
13c not occupied
14c not occupied
15c operating voltage zero
16c not occupied
17c not occupied
18c output UA="10 V; R>5 kOhm
19c operating voltage zero
20c not occupied
21c external zero balancing tap
22c not occupied
23c not occupied
24c external zero balancing (R=50 kOhm)
25c external switching from MR1 to MR2
26c external zero balancing (R=50 kOhm)
27c not occupied
28c sensing line F(gn)
29c operating voltage zero
30c measuring signal A(wh)
31c operating voltage zero (ye)
32c sensing line G(gy) St 21
1a not occupied
2a not occupied
3a not occupied
4a DC-DC converter positive pole
5a DC-DC converter negative pole
6a not occupied
7a output
Uadd.=−14.5...−15.5 V; <50 mA
8a not occupied
9a not occupied
10a not occupied
11a not occupied
12a not occupied
13a internally connected
14a internally connected
15a supply voltage
+14.5...+15.5 V (standard)
16a supply voltage
−14.5...−15.5 V (standard)
17a not occupied
18a not occupied
19a current output with EM002
20a operating voltage zero
21a zero function, external
22a not occupied
23a not occupied
24a not occupied
25a calibration function, external
26a not occupied
27a not occupied
28a bridge supply voltage C(bu)
29a operating voltage zero
30a measuring signal D(rd)
31a operating voltage zero (ye)
32a bridge supply voltage B(bl)

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HBM A0260-1.1 en
3 Putting into Operation
If the manufacturer’s settings, such as the coarse measuring range, are re-
tained the operation is limited to the following points:
3.1 Select Measuring Range
With the ex-works setting measuring range 1 ("1 mV/V) is always switched
on. Measuring range 2 (calibration at "0.2 mV/V) can be selected either in-
ternally via DIP switch 24/4 or externally by connecting a single-pole change-
over switch to pin 25c (see chapter 4.2).
3.2 Bridge Zero Balancing
The bridge zero balancing is carried out by means of the screwdriver poten-
tiometers P23 (fine) and switches S22 (coarse) and S23 (polarity). (See also
chapter 4.4).
3.3 MR Fine Adjustment
The fine adjustment of the measuring range is made seperately for both
ranges by means of the screwdriver potentiometers P21 (measuring range 1)
and P22 (measuring range 2). The potentiometers, which are accessible from
the front, permit corrections of approx. 35 % (related to the set measuring
range). As far as measuring range 1 is concerned, the fine adjustment is also
possible via an external potentiometer (for this see chapter 4.3).
Attention: P22 must not be altered in order not to detune the manufacturer’s
calibration of MR2 ("0.2 mV/V). (for this see chapter 4.5).

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ME50S6
HBMA0260-1.1 en
P21
P22
ME50
S21
P23
S22
S23
Fig. 3.1: Front view ME50S6

14 ME50S6
HBM A0260-1.1 en
4 Individual Settings
Various ex-works settings on the measuring amplifier card can be altered.
Adaptations, which are of no problem, can be carried out by means of the DIP
switch on the board or also by externally wired switching elements. If re-
quested with the order, they can be carried out by the manufacturer.
4.1 Operational Setting
Zero Measure Calibrate
Switch S21 or connect pin 21a to pin 15c
or connect pin 25a to pin 15c
The measuring signal is switched off in the ”Zero” function, so that the output
signal indicates the adjusted balance value as ”Zero value”. This function en-
ables amplifiers to be replaced in measurement systems without the need for
rebalancing the bridge with zero load on the transducer. All that is required is
that the amplifier balance values are noted and then this value is set, if neces-
sary, with P23, S22 and S23.
4.2 Setting the Measuring Range
Measuring range 1 is get ex-works. Measuring range 2 can be activated by
switching DIP switch S24/4 or by external switching.
Measuring Range S 24/4 Externally
MR 1 = "1 mV/V
(ex-works setting) −
MR 2 = "0.2 mV/V from MR1 to MR2;
connect 25c and 15c
Any alteration to the measuring ranges between "0.2 mV/V and "4 mV/V
with UB= 5 V (resp. "1.0 mV/V... "20 mV/V with UB= 1.0 V) can be made
by means of the DIP switches S26 and S27. For fine balancing see 3.3.

15
ME50S6
HBMA0260-1.1 en
UB=5 V MR1:S26 ; MR2:S27 ex-works sett.
Meas.range(mV/V) 1 2 3 4 5 6 7 8
0.17 0.24. . . x o o o o o x o MR 2 "0.2mV/V
0.22 0.32. . . x o o o o o o x
0.30 0.42. . . o x o o o o x o
0.39 0.55. . . o x o o o o o x
0.52 0.73. . . o o x o o o x o
0.68 0.97. . . o o x o o o o x
0.90 1.28. . . o o o x o o x o MR 1 "1mV/V
1.18 1.69. . . o o o x o o o x
1.56 2.23. . . o o o o x o x o
2.07 2.94. . . o o o o x o o x
2.73 3.88. . . o o o o o x x o
3.61 5.13. . . o o o o o x o x
o = open, x = closed
4.3 External Fine Balancing of the MR1
An external Potentiometer (5 kΩ) can be connected for fine adjustment of the
range.
This will enable about 35 % correction of the selected range.
Connections:
potentiometer pin 9c. . . . . . . . . . . . . . . . . . . . . .
wiper pin 8c. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
potentiometer finish pin 7c. . . . . . . . . . . . . . . . .
4.4 Bridge Fine Balancing
a) Coarse Balancing
The 16-stage switch S22 is used for the coarse balancing carried out from the
front panel; the polarity of the balancing direction can be chosen via switch
S23. The overall balancing range is approximatly "2 mV/V.
b) Fine Balancing
The potentiometer P23 is used for the fine balancing ("0.08 mV/V).
R=5 kΩ

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HBM A0260-1.1 en
c) External Zero Balancing
A potentiometer of 50 kΩ, which can be connected externally, can be used for
settings within a balancing range of "0.12 mV/V set by the manufacturer.
Pin assignment:
potentiometer pin 26c. . . . . . . . . . . . . . . .
wiper pin 21c. . . . . . . . . . . . . . . . . . . . . . .
potentiometer finish pin 24c. . . . . . . . . . .
4.5 Calibration Signal
The measuring amplifier ME50S6 operates on a 6-wire technique, i.e. the cal-
ibration and zero compensation signals are formed from the bridge supply
voltage fed back; thus they are independent of transducer, connecting cable
and pin resistances. If necessary, the sensitivity of the measuring amplifier
can be adjusted by means of an internal calibration signal of +1 mV/V with
measurimg ramges > 1mV/V. Here the switch S21 must be kept in the calibra-
tion position and the appropriate value must be be set simultaneously by
means of the potentiometers P21 resp. P22. When using the ex-works cal-
ibration measuring range 2 the setting of P22 must be altered. (see chapter
3.3).
4.6 Measuring Frequency Range / Cut-off Frequency fco
The Butterworth low pass of the amplifier has been set to 0...250 Hz (−1 dB)
by the manufacturer. It can be readjusted by switching the DIP switch S24/3 to
0...40 Hz (−1 dB).
Measuring frequency range S 24/3
0...250 Hz (−1 dB)
(ex-works setting)
0...40 Hz (−1 dB);
R=50 kΩ

17
ME50S6
HBMA0260-1.1 en
4.7 Synchronization
When synchronizing several units of the type ME50S6 one of them has to be
switched as master; its carrier frequency is used for reference. Pins 12c and
15c of all amplifiers concerned must be joined for synchronization. The master
amplifier is selected by switch S28.
Synchronization S S28
Slave amplifier (ex-works setting)
Master amplifier

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HBM A0260-1.1 en
5 Options
5.1 Stabilized Power Supply
The module KM001 can be used to connect the measuring amplifier to a sym-
metrical supply voltage "15.6...25.0 V. When installing the module KM001,
attention must be paid to the marking. The jumpers BR3 and BR4 have to be
configured according to the table below.
Pin assignment:
positive pole pin 15a. . . . . . .
negative pole pin 16a. . . . . .
supply zero pin 19c. . . . . . . .
5.2 DC-DC Converter
The manufacturer can mount a DC-DC converter onto the board for the op-
eration of a simple operating voltage with simultaneous electrical isolation be-
tween operating voltage and measuring circuit. The voltage converter can be
delivered for operation +9...+35 V (for unstabilized voltage).
Pin assignment:
positive pole pin 4a. . . . . . .
negative pole pin 5a. . . . . .
When using the modules KM001 resp. a DC-DC converter attention has to
be paid to the jumpers BR3 and BR4 which are re-configured.
ex-works setting:
1 2 3
BR3
BR4
I
I
With module KM001 resp. DC-DC converter
1 2 3
BR3
BR4
I
I

19
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HBMA0260-1.1 en
5.3 Current Output Module
The module EM002 can be installed to obtain a current output.
The pin assignment is as follows:
output current pin 19a. . . . . .
supply zero pin 20a. . . . . . . .
The power range is switched by the DIP switch 24/5.
Output current source S24/5
+4...+20 mA
+20 mA (ex-works setting)
When using an EM002, current and voltage outputs are not aligned to each
other. The required fine calibration can be carried out from the front panel (as
described in chapter 3)
5.4 Safety Barriers for use in Hazardous Areas
For transducer operation in potentially explosive atmospheres the safety barri-
ers SD01A are used conforming to the protection classes (EEx ia IIC) accord-
ing to EN 50 014 and EN 50 020.
5.5 Additional Units
The following additional cards are available for the measuring amplifier
ME50S6:
−automatic zeroing unit NE02
−peak / last value memory SE03
−limit switch GE04

20 ME50S6
HBM A0260-1.1 en
6 General Notes
6.1 Disturbances
Certain regulations concerning electrical installation have to be observed in
plants with strongly disturbed supply mains systems. The most important
points are listed up in the HBM leaflet ” Hints for connection/disturbances”. An
extensive summary is given in the installation regulations VDI/VDE 3551. The
extent of certain measures to be taken depends on the specific applications.