Strain Gauge Measuring Amplifier BA 660

Strain Gauge Measuring Amplifier BA 660
Strain Gauge Measuring Amplifier BA 660
Original of the
Manual
BA660 / IP20
BA660 / IP66
Table of Contents
1. Safety precautions ...........................................................................................................2
1.1.
Field of application ......................................................................................................2
1.2.
Installation ...................................................................................................................2
1.3.
Maintenance................................................................................................................2
2. Function ............................................................................................................................2
3. Specifications...................................................................................................................3
4. Connections / Dimensions ..............................................................................................4
4.1.
How to connect force transducers ...............................................................................5
4.1.1. Installation recommendations......................................................................................5
4.2.
How to connect signal output ......................................................................................5
4.2.1. Parallel connections of outputs ...................................................................................5
4.2.2. How to connect supply voltage....................................................................................5
4.2.3. Trigger input ................................................................................................................5
5. Operation ..........................................................................................................................6
5.1.
Overview operating elements BA660/IP20..................................................................6
5.2.
Setting of measuring range and filter BA660/IP66 ......................................................6
5.3.
How to operate the keys..............................................................................................6
5.4.
Amplification ................................................................................................................7
5.5.
Zero alingment ............................................................................................................7
5.6.
Factory setting (RESET)..............................................................................................7
5.7.
Filter ............................................................................................................................7
5.8.
Signal output ...............................................................................................................8
5.9.
LED Status ..................................................................................................................8
5.10. Restart.........................................................................................................................8
6. EC Declaration of Conformity .........................................................................................9
Technical changes reserved. 05/2016
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
Page 1 of 9
Manual BA 660
1. Safety precautions
In this operating manual, the installation, putting into operation and the operation itself of the
Strain Gauge Bridge Amplifier BA 660 is described. It is assumed that all measures are taken
by qualified staff only who have adequate knowledge in the fields of measuring and control
engineering.
ATTENTION!
Any non-compliance with these safety precautions may result in severe damage to
property and health.
1.1.
Field of application
The Strain Gauge Bridge Amplifier BA 660 has been designed to the purpose of amplifying the
output signals of sensors with metal-foil strain gauges, preferably force transducers and
transform them into standard signals. Any other application is regarded contrary to the
intended purpose. The manufacturer does not accept any liability for damages resulting from
such inappropriate usage. In this case it is the user alone who has to bear the risk.
Type BA 660 must not be used as the sole means to prevent dangerous conditions of
machines and plants. All machines and plants must be constructed in such a way (e.g. by
using mechanical stops, limit switches) that a condition of failure does not result in a situation
of severe danger.
It must be made sure that any erroneous setting or malfunction of the unit or its breakdown
cannot cause damage or be a risk to the operating staff or other persons.
1.2.
Installation
The unit must be installed and connected in compliance with the current DIN- and VDEstandards. Supply cables and signal lines shall be installed so that interference signals such
as electrical interference do not have any adverse effects on the function of the equipment.
1.3. Maintenance
The device does not contain any components that require maintenance. Repairs shall be
carried out by the manufacturer only.
2. Function
The Strain Gauge Bridge Amplifier BA 660 is a digital amplifier for the low-drift amplification of
the output signals of sensors with metal-foil strain gauges, preferably force transducers to
supply a standard signal of (-10/0...10) VDC or (0/4...20) mA.
An internal voltage source provides the stabilized feeding voltage for the sensor. The power is
supplied by an unstabilized source of (9...36) VDC. The Strain Gauge Bridge Amplifier is
delivered in a case for standard rails in accordance with DIN EN 50022-35.
The BA660 is delivered with a factory setting for an input signal of 2mV/V and a corresponding
output signal of ± 10V or 20mA. The other input signal ranges 0.1mV/V to 7mV/V can be
generated internally from the 2mV/V factory adjustments. The different settings of the factory
adjustments (zero point and gain) can be changed by the user through keys.
By an optically separated input, the zero-setting can be carried out by means of a superior
control and through the trigger input. The overload limit is not affected by such a zeroing,
which means that 100 % of the end-value adjustment of the sensor remains as end value. An
existing preload by a container can thus be set zero.
Page 2 of 9
Technical changes reserved. 05/2016
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Manual BA 660
3. Specifications
Class of accuracy at input signal 2mV/V
Connection for strain gauge sensor
Bridge resistance / range of input impedance
Input signal range (+Si/-Si)
Excitation voltage (+Ex/-Ex)
Norm Output
Current Output
Voltage Output
Load resistance
Measurement Characteristics
Conversion rate
Resolution of the A/D Converter
Filter
Error at S=2mV/V
Nonlinearity
Noise (at measurement rate)
Input sensitivity for 1 LSB
Zero drift
Power Supply
Input range
Power consumption (without sensor)
Environmental Conditions
Operating temperature range
Storage temperature range
Construction
Housing
Weight
Dimensions (W x H x D)
Environmental protection (EN 50529)
Terminal block, wire size
% FSR
Ω
mV/V
VDC
mA
V
Ω
< 0.02 (typ.)
4- or 6-wire
58...2000 (up to 6 loadcells each 350 Ω)
0.1 / 0.25 / 0.5 / 1.0 / 1.5 / 2.0 / 3.0 / 4.0 / 5.0 / 7.0
±2.5
0/ 4... +20; 0…24
-10/-5...0…+5/ +10
≥ 1000
≤ 500
Hz
Bit
Hz
6 …. 3200
24
0.8…2000
%FSR
%FSR
nV
%/ 10K
0.0025
0.002 (0.8Hz) … 0.009 (2000Hz)
150
<0.01
VDC
W
9 ... 36
1
°C
°C
- 20...+ 60
- 25...+ 85
kg
mm
mm²
BA 660/IP20
Plastic housing for DIN-rail
mounting
0.2
22.5 x 114.5 x 99
IP 20
0.14 … 2.5
BA 660/IP66
Aluminium die-cast
0.5
125 x 80 x 57
IP 66
0.14 ... 1.5
Circuit diagram
Power supply
9 … 36VDC
0V
Sensor
+Se
+Ex
+Si
-Si
2.Stab
1.Stab
±12V
Output
IOut
A
D
C
-Ex
-Se
2’.Stab
Shi
EMC-Filter
µC
16-Bit
-DAC
Filter
DIP-Switch
(Konfig. DAC)
Technical changes reserved. 05/2016
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
VOut
AG
Trigger input
Tr+ 24VDC
Tr- 0V
Page 3 of 9
Manual BA 660
4. Connections / Dimensions
BA 660 / IP66
58
BA 660 / IP20
Filter (Hz)
67
25
156
8,3
2,4
125
385
625
113
1315
0,8 2000
0 ... 10V
0 ... 5V
Output
-10 ... +10V
-5 ... +5V
0 ... 20mA
0 ... 24mA
80
52
4 ... 20mA
+Si -Si NC SHI
-Ex -Se +Se +Ex
BA 660
6-Wire
4-Wire
0.25
0.1
7.0
0.5 1.0
1.5
2.0
3.0
5.0 4.0
mV/V
+
100%
Reset
+
0%
Status
AG VOUT IOUT NC
24V 0V Tr- Tr+
Terminal connection
-Ex
-Se
+Se
+Ex
+Si
-Si
NC
SHI
AG
Vout
Iout
NC
24V
0V
Tr+
Tr-
Page 4 of 9
Description
neg. Exitation voltage
neg. Sense signal
pos. Sense signal
pos. Exitation voltage
Sensor with
6-wire
pos. Signal
neg. Signal
not connected
Shield
Ground for output signal
Voltage output
Outuput signal
Current output
not connected
Supply voltage
Power supply
Supply voltage ground
Trigger 24V
electrically isolated input
Trigger 0V
The connection NC is only the BA 660 / IP20 available.
Technical changes reserved. 05/2016
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
Manual BA 660
4.1.
How to connect force transducers
4.1.1. Installation recommendations
•
•
•
•
•
•
•
•
Use shielded cables.
Use the largest possible cable cross section (Error due to cable extension).
Lay the measuring lines separately from the power supply lines.
At the force transducers and the measuring amplifier, make as short as possible a
connection to earth, in particular in strong electromagnetic fields.
Additionally, lay an equipotential bonding parallel to the measuring line.
Keep away from stray fields of motors, transformers and contactors.
Connect force transducers, amplifier, mains unit, and indicator / processor unit with earth in
one place only.
Set the slide switch for the sensing line (6- or 4-wire) according to the sensor connection.
4.2.
How to connect signal output
The Bridge Amplifier BA 660 provides different output signals, depending upon the setting of
the slide switches. (see 5.8)
Either the current output or the voltage output can be used, not both at the same time.
4.2.1. Parallel connections of outputs
To form the sum, current outputs of several BA660 can be connected in parallel. In this case,
12V should not be exceeded at the standard output and the maximum load (load resistance)
be <12V / IOut.Voltage outputs must not be connected in parallel.
4.2.2. How to connect supply voltage
The supply voltage is connected to the terminal (24V) and to (0V). The bridge amplifier is
protected against voltage reversal.
4.2.3. Trigger input
The BA660 has an optically separate trigger input so that the zero-setting can be carried out
by means of a superior control. The overload limit is not affected by such a zeroing.
The function is started by a 24 VDC trigger impulse.
Technical changes reserved. 05/2016
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
Page 5 of 9
Manual BA 660
5. Operation
5.1.
Overview operating elements BA660/IP20
BA
6-Wire
4-Wire
0.25
0.1
7.0
0.5 1.0
1.5
2.0
3.0
5.0 4.0
mV/V
+
100%
RESET
+
0%
Status
Sensitivity /
measuring range
of sensor in mV/V
Filter (Hz)
67
25
Amplification
8,3
2,4
Push simultaneous:
Load calibration
385
625
1315
2000
0,8
0 ... 5V
-10 ... +10V
Output
-5 ... +5V
Zero :
0 ... 20mA
Push simultaneous:
Zero calibration
0 ... 24mA
4 ... 20mA
LED: Status
Setting of measuring range and filter BA660/IP66
+
100%
-
3
2
1
7 8
2
0,5
8,3
7 8
1
0,25
2,4
4 5 6
0
0,1
0,8
+
0%
-
ON
2 3
9 0 1
Sense
2 3
9 0 1
Filter (Hz)
4 5 6
Switch position
Measuring range (mV/V)
Filter (Hz)
5.3.
156
0 ... 10V
Factory setting
(RESET)
Reset
5.2.
Connection
mV/V
Output
3
1,0
25
4
1,5
67
5
2,0
156
6
3,0
385
7
4,0
625
8
5,0
1315
9
7,0
2000
How to operate the keys
Keys individually / short:
Keys individually / long (2s):
Page 6 of 9
Setting of the signal output
Fast setting of the signal output
Technical changes reserved. 05/2016
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
Manual BA 660
5.4.
Amplification
>100% +< and >100% -< simultaneously (2s): Adjustment of the present input signal (currently
applied force) to100% of the output signal (end-value adjustment).
By individually pushing the keys >100% +< or >100% -< respectively, an individual fine
adjustment of the output signal / the end value is possible.
i
INFORMATION!
In case of changing the amplifier output by means of keys > 100 % +< or > 100% -<
there should always be a zero-alignment check.
i
INFORMATION!
Amplification-values are saved permanently 7 seconds after last push button action.
During saving LED blinks for a short time.
5.5.
Zero alingment
>0% + < and >0% - < simultaneously (2s):
Setting of the present input signal at the output
to zero point (zero-adjustment / zero-alignment)
By individually pressing the keys >0% +< or >0% -< respectively, an individual fine adjustment
of the output signal / the zero point is possible.
INFORMATION!
Zero-values are saved permanently 7 seconds after last push button action. During
saving LED blinks for a short time.
i
5.6.
Factory setting (RESET)
For all ten sensitivity settings / measuring ranges (see 5.1 – sensitivity in mV/V of the sensor)
factory settings are stored in the amplifier.
Individual adjustments of the amplification (see 5.4.) or of the zero point (see 5.5) carried out
later by the user, do only influence the active measuring range that has just been set.
When simultaneously pushing the two keys >100% +< and >0% -< for 2s, all zero-point
adjustments and end-value adjustments of all ten measuring ranges are deleted and reset to
the factory settings of 0mV/V ≙ initial value of the selected signal output (-5/-10/0V or 0/4mA)
and 2mV/V ≙ end value of the selected signal output (5/10V or 20/24mA).
ATTENTION!
After reset to factory settings, the amplifier has to be newly adjusted to the
sensor!
i
5.7.
Filter
Through a low-pass filter, the output signal can be set in 10 stages, from 0.8 to 2000Hz.
Filter (Hz)
Internal Sample rate (Hz)
0,8
2,4
8,3
25
67
156
385
625
1315
2000
6
12
25
50
100
200
400
800
1600
3200
Technical changes reserved. 05/2016
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
Page 7 of 9
Manual BA 660
5.8.
Signal output
DIP-switch explanation:
DIP-switch function:
- OFF 0...+10V
0…+5V
-10…+10V
-5…+5V
0…20mA
0…24mA
4…20mA
4321
i
ATTENTION!
In case of exceedance of the input signal of >-120%, the analogue output is set to the
maximum positive initial value.
In case the input signal lies in the range between -120% and 0%, the minimum
analogue signal is released at the unipolar voltage output and the current output
respectively (see too 5.9).
output unipolar (U/I)
output bipolar (U)
-120%
120%
Input
-120%
120%
Input
Sensor mV/V
Graph 1 Output signal in case of error (bipolar)
Output signal -5…5V, -10…10V
5.9.
Graph 2 Output signal in case of error (unipolar)
Output signal 0…5/10V, 0/4…20/24mA
LED Status
LED display
Green
Explanation
Ready for operation
Red 1 x flashing
ADC-Overload
Red 2x flashing
Indicates overload
or underload
Red 3x flashing
TEDS error
Red 4 x flashing
Output > 100%
Red 5 x flashing
Current output open
or overheating DAC
Red 6 x flashing
Hardware error
Error description
• No error
• Error at connections of sensor lines
• Cable break in sensor line
• Switch for 6- and 4-wire not accordingly
connected
• Exceed of maximum load of 120% of nominal
sensitivity, or exceed minimum load (see too 5.8)
• Error in the memory of the automatic sensor
recognition
• (only at BA660 – option with TEDS)
• The amplification at the output is set too high.
• Output side not closed
• Cable break at output
• Thermal overheating - cooling necessary
• General error – restart necessary
5.10. Restart
>100% -< und >0% +< simultaneously: A restart is carried out. All settings are saved.
Page 8 of 9
Technical changes reserved. 05/2016
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
Manual BA 660
6. EC Declaration of Conformity
Technical changes reserved. 05/2016
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
Page 9 of 9
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