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ME30
Operating Manual
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Operating Manual
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HBM ME30 Operating Manual

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Page 1
600 Hz Measuring Amplifier
for strain gauge transducers measuring frequency 0...60 Hz
ME30
Operating manual
B 31.ME30.11 e
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ME 30
Safety instructions
In order to ensure sufficient immunity from disturbance only use Greenline shielding (see HBM’s special publication ”Greenline” Screening Concept, elec­tromagnetic compatibility of measuring cable, G36.35.0)
The connection lines’ ( ≤ 50V) minimum insulation strength must be 350V(AC).
Appropriate use
The ME30 with the connected transducers may be used for measurement and directly related control and regulation tasks, only. Any other use is not ap­propriate.
To ensure safe operation, the ME30 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 instruc­tions
The ME30 complies with the state of the art and is operationally reliable. If the device is used and operated inappropriately by untrained personnel, residual 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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ME 30
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 ME30 scope of performance and supply covers part of the measuring­technology, only. The plant designer/constructor/operator must in addition de­sign, 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.
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.
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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.
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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ME 30
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 ME30 construction and safety. HBM does not take responsibility for damage result­ing from unauthorized modifications.
In particular, repair and soldering works on the boards are prohibited. If com­plete 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-men­tioned dangers.
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ME 30
1 Measuring Amplifiers on Eurocards ME30
The Eurocards ME30 is a 600 Hz carrier frequency amplifiers for strain gauge transducers. An aluminium front panel (4 divs. wide) is delivered as standard. Aplasticcs handle can be mounted instead of it if ordered separately.
All plug-in cards are delivered without housing without power supply unit so that a 19” rack frame can be set up as required. 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 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/external
S24/3:
switch for measuring frequency range 60Hz to 2Hz
S24/4:
MR changeover from MR1 to MR2
S25:
switching the bridge excitation voltage
S26/27:
setting of measuring range (coarse)
P21/22:
fine balancing of MR
P23:
zero balancing (fine)
Cal. +1mV/V zero
MR1 fine balancing external
5kΩ
50kΩ
zero balancing external
zero calibr. MR1–2
wh
gy bk bu gn
14.5...15.5V <50mA
14.5...15.5V <50mA
–
+ 9V...+35V (opt. DC/DC converter)
U
B
+14.5...+15.5V
UB –14.5...–15.5V
U
a
10V >5kOhm
option Ia 20mA
2.33V
ss
synchr.-voltage or synchr. input
+ –
Fig. 1.1: Block diagram
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2 Electrical Connection
2.1 Transducer Connection
Strain gauge transducers are connected by means of 6-wire circuits. With transducers in 4-wire technology the sensing leads are not needed. In
this case the contacts 32a+c and 28a+c on the connector must be linked.
screen pins 31a+c. . . . . . . . . . . . . . . . . .
rd gy bk
wh
bu gn
ye
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 28c (+) pin 28c. . . . .
contact
(alternatively 29a+c)
Fig. 2.1: Bridge connection
The required bridge excitation voltage set by the factory is 5V(symmetrical about ground). It can be switched to 2.5V by switch S25.
U
B
Bridge resistance Switch S25
2.5V R
B
≥60...4000Ω
5V
(ex-works settings)
R
B
≥110...4000Ω
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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2.2 Supply Voltage
a) stabilized double-pole supply voltage
+14.5...+15.5V (max.70mA) . . . . . . . . . . .
–14.5...–15.5V (max.65mA) . . . . . . . . . . .
operating voltage zero . . . . . . . . . . . . . . .
The ripple on the supply voltage should not exceed 0.1V 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...±25V in order to maintain the dissipation at a low value.
b) unstabilized double-pole supply voltage
If a stabilized voltage is not available, the amplifier can be operated by means of a stabilizer(unstabilized supply) or a DC-DC converter (single-pole supply, battery) (see chapter 5.1 and 5.2).
2.3 Output
output voltage: ±10V; RL ≥5 kΩ . . . . . . . .
operating voltage zero . . . . . . . . . . . . . . .
The output is provided for the connection of a display and/or recorders. A current output is possible optionally (see chapter 5.3).
2.4 Supply Voltage for Additional Units
Stabilized voltages are available for current supply of additional function units.
+14.5V...+15.5V ; <50mA . . . . . . . . . . . . .
–14.5V...–15.5V ; <50mA . . . . . . . . . . . . .
operating voltage zero . . . . . . . . . . . . . . .
pin15a pin16a pin19c
+
pin18c pin 20a
±
+
pin6c pin 7a pin15c
–
–
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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 U
add.
=+14.5...+15.5V; <50mA 7c MR1 external fine balance (R=5kOhm) 8c MR1 external fine balance. tap 9c MR1 external fine balance (R=5kOhm) 10c not occupied 11c Synchronization 12c not occupied 13c not occupied 14c not occupied 15c operating voltage zero 16c not occupied 17c not occupied 18c output U
A
=±10V; R>5kOhm 19c operating voltage zero 20c not occupied 21c external zero balancing tap 22c not occupied 23c not occupied 24c external zero balancing 25c external switching from MR1 to MR2 26c external zero balancing 27c not occupied 28c sensing line (gn) 29c operating voltage zero 30c measuring signal (wh) 31c operating voltage zero (ye) 32c sensing line (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
U
add.
=–14.5...–15.5V; <50mA 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...+15.5V (standard)
16a supply voltage
–14.5...–15.5V (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 (bu) 29a operating voltage zero 30a measuring signal (rd) 31a operating voltage zero (ye) 32a bridge supply voltage (bl)
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3 Putting into Operation
If the factory settings, such as the measuring range or zero balance are re­tained, the operation is limited to setting the zero point and the measuring ranges.
3.1 Select Measuring Range
With the factory setting
measuring range 1
(±2mV/V) is always switched on. Measuring range 2 (calibration at ±0.2mV/V) can be selected either internally via DIP switch 24/4 or externally by closing a single-pole change-over switch to pin 25c against operating voltage zero (see chapter 4.2).
3.2 Bridge Zero Balancing
Carry out
bridge zero balancing
by means of the screwdriver potentiometers
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 in the front panel 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 setting (MR2 ±0.2mV/V). (see chapter 4.5)
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P21
P22
ME30
S21
P23
S22
S23
Fig. 3.1: Front view ME30
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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 re­quested with the order, they can be carried out by the manufacturer.
4.1 Operational Setting
Zero Measure Calibrate
S21
or connect pin 21a to pin 15c
or connect pin 25a to pin 15c
Switch
The transducer signal is switched off in the ”Zero” function, so that the ”Zero Value” of the amplifier is applied to the output. This function enables amplifiers to be replaced in measuring chain without the need for rebalancing the bridge with the unloaded transducer. All that is required is that the amplifier balance values are noted and then this value is set, if necessary, 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 = ±2mV/V
(ex-works setting)
–
MR 2 = ±0.2mV/V
from MR1 to MR2;
connect 25c and 15c
Any alteration to the measuring ranges between ±0.2mV/V and ±4mV/V with U
B
= 5V (resp. ±0.4mV/V and ±8mV/V with UB = 2.5V) can be made by
means of the DIP switches S26 and S27. For fine balancing see 3.3.
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UB = 5V 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
1.18 1.69. . o o o x o o o x
1.56 2.23. . o o o o x o x o MR 1 ±2mV/V
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
Connections:
potentiometer pin 9c. . . . . . . . . . . . .
wiper pin 8c. . . . . . . . . . . . . . . . . . . .
potentiometer finish pin 7c. . . . . . . .
An external 5kΩ potentiometer can be connected for fine adjustment of the range. This will enable about 35% correction of the selected range.
R=5kΩ
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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 ±2mV/V.
b) Fine Balancing The potentiometer P23 is used for the fine balancing (±0.08mV/V).
c) External Zero Balancing A balance range of ±0.12mV/V set by the manufacturer can be passed with
an externally connected potentiometer of 50 kΩ Pin assignment:
potentiometer pin 26c. . . . . . . . . . . . .
wiper pin 21c. . . . . . . . . . . . . . . . . . . .
potentiometer finish pin 24c. . . . . . . .
4.5 Calibration signal
Switching switch S21 to the right (calibration) detunes the amplifier by a de­fined amount (=+1mV/V). The measuring range can be adjusted without hav­ing to load the connected transducer respectively. The voltage at the amplifier output which is equal to the calibration signal is added to an available voltage, if any (additive calibration signal)
R=50kΩ
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4.6 Measuring Frequency Range / Cut-off Frequency f
co
The Butterworth low pass of the amplifier has been set to 0...60Hz (–1dB) by the manufacturer. It can be readjusted by switching the DIP switch S24/3 to
0...2Hz (–1dB).
Measuring frequency range S 24/3
0...60Hz (–1dB); (ex-works setting) fco = 80Hz (–3dB)
0...2Hz (–1dB);
fco = 2.5Hz (–3dB)
4.7 Synchronization
When operating several ME30 amplifiers (in a common housing), one of them has to be switched as the master the carrier frequency of which supplies the clock pulses, the others are to be switched as slave. Pins 11c of all amplifiers have to be joined for synchronization. The master amplifier is selected by switch S28.
Synchronization Switch S28
Slave amplifier (ex-works setting)
Master amplifier
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5 Options
5.1 Stabilized Power Supply
The module KM001 can be used if the amplifier is connected to a symmetri­cal unregulated supply voltage of ± 15.6...25.0V. The module supplies the two stabilized supply voltages internally to the amplifier.When installing the mod­ule KM001, attention should be paid to the marking (bridge 3 and bridge 4 on pin 1 and 2).
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 oper- ation of a single-pole supply voltage (battery). The voltage converter is suit­able for operation on +9...+35V (unstabilized).
Pin assignment:
positive pole pin 4a. . . . . . . . . . . . . .
negative pole pin 5a. . . . . . . . . . . . .
The DC-DC converter decouples the internal operating voltages from the sup­ply voltage.
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
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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 barri­ers SD01 are used conforming to the protection classes (EEx ib IIC) accord­ing to VDE0171, EN 50 014 and EN 50 020 (see data sheet).
5.5 Additional Units
The following additional cards are available for the measuring amplifier ME30: – automatic zeroing unit NE02 – peak / last value memory SE03 – limit switch GE04
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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.
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7 Technical Data
Type ME30 Carrier frequency Hz 600±0.5% Bridge excitation voltage V 2.5±2% 5±0.2% Transducers which can be connected
strain gauge transducers (full bridge) W 60...4000 110...4000 maximum cable length m 500
Number of measuring ranges 2
measuring ranges, adjustable in 12 steps mV/V 0.4...8 0.2...4 continuous fine adjustment; % 35 ex-works setting: Measuring Range 1 mV/V ±2
Measuring Range 2 mV/V ±0.2
Calibration signal mV/V +1±0.1% Bridge balance range
coarse balance, adjustable in 16 steps and polarity
mV/V ±2
fine balance, with screwdriver potentiometer mV/V ±0.08
Measuring frequency (Butterworth low pass 3rd order;
switchable) at –1dB Hz 0...2 0...60 at –3dB Hz 2.5 80 phase delay ms 135 4.8 rise time ms 170 7 surge voltage overshoot % <10 <10 residual carrier % <0.1 <0.2; typ. 0.1
Input (symmetrical)
input resistance MΩ
par.
pF
>10
470 perm. common-mode voltage V 12 (peak-to-peak) ; (±6V) common-mode rejection (>50 dB) Hz 0...600
Output (asymetrical)
nominal voltage V ±10 permissible load resistance kΩ >5 internal resistance W <5
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7 Technical Data (Continuation)
Noise, referred to input
µV/V <0.2 (peak-to-peak); typ.0.1
Linearity deviation
related to nominal voltage
% <0.02; typ. 0.01
Temperature influence
per 10K in nominal temperature range
on measuring sensitivity % <0.1; typ. 0.05 on zero point at amplifier output in MR 2mV/V at UB=5V (4x350Ω) mV <4, resp. in MR 0.2mV/V at UB=5V mV <13; additionally
<0.05% of the tare value
suppressed with the R compensation
Long term drift over 48h (after 1h warm-up) µV/V <0.05 Nominal temperature range °C –10...+60 Operating temperature range °C –20...+60 Storage temperature range °C –25...+70 Stabilized Voltage
for the operation of additional units V ±15 max. power consumption mA <50
Supply current standard;
stab.
KM001 DC-DC
converter
Supply voltage V 14.5...15.5 15.6...
25
+9...+35
max. current consumption (without additional units)
mA +70/–65 <+80/<–70 340...140
influence of supply voltage for changes in the relevant range
the measuring sensitivity % <0.8 <0.02 <0.02
the zero point µV/V <0.1 <0.1 <0.1
Output current, with option EM002 mA 20 acc. +4...+20
permissible connection resistance W 0...500 internal resistance kΩ >100 current consumption
with standard and KM001 add. mA < + 30 with DC-DC converter mA 75...25
linearity deviation related to nominal current % <0.05
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8 Component Layout
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9 Copy of Declaration of Conformity
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ME 30
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