SENSY COND-SGA-A Manuel utilisateur

COND SGA-A & SGA-D Manuel_EN Rev3.doc Page 1 on 20 Rev: 03/08/2006

COND SGA-A & COND SGA-D

STRAIN GAUGE TRANSDUCER AMPLIFIER

1. INTRODUCTION......................................................................................................................................................................................................... 2

2. INSTALLING THE COND SGA/A & COND SGA/D .................................................................................................................................................... 2

2.1. Pre Installation.................................................................................................................................................................................................... 2

2.2. Dimensions......................................................................................................................................................................................................... 3

2.3. Cabling................................................................................................................................................................................................................ 3

2.3.1. Power Connection ..................................................................................................................................................................................... 3

2.3.2. Input (Sensor) Connections....................................................................................................................................................................... 4

2.3.3. Output Connections................................................................................................................................................................................... 5

3. SWITCH SETTINGS ................................................................................................................................................................................................... 6

3.1. Output Settings - Switch 4.................................................................................................................................................................................. 6

3.1.1. Output Option ............................................................................................................................................................................................ 6

3.1.2. Switch 4 ..................................................................................................................................................................................................... 6

3.1.3. Example :- 0-10 Volt output with no filter required. ................................................................................................................................... 7

3.2. Output Filter Settings –Switch 3 ......................................................................................................................................................................... 7

3.2.1. Switch 3 ..................................................................................................................................................................................................... 7

3.2.2. Example : The Switch Settings for a cut-off frequency of 50 Hz setting is illustrated below..................................................................... 8

3.3. Output Current Mode and Input Filter Settings – Jumpers JP1, JP2 & JP3....................................................................................................... 8

3.4. Span (Gain) Setting Switch 1 ............................................................................................................................................................................. 8

3.4.1. SW1 ........................................................................................................................................................................................................... 9

3.4.2. Example : A strain gauge has a sensitivity of 2.809 mV /V ..................................................................................................................... 10

3.5. Shunt Calibration Switch SW1/8....................................................................................................................................................................... 10

3.6. Zero (Offset) Setting Switch SW2..................................................................................................................................................................... 10

3.6.1. Example :An installation has a tare of 15 kg with a 200kg strain gauge which gives an output of 6.37mV/V at 10V excitation............. 11

4. CALIBRATION........................................................................................................................................................................................................... 11

4.1. Output............................................................................................................................................................................................................... 11

4.2. Zero Offset........................................................................................................................................................................................................ 11

4.3. Sensitivity.......................................................................................................................................................................................................... 11

4.4. Calibration Connections using mV Source....................................................................................................................................................... 12

5. TROUBLESHOOTING .............................................................................................................................................................................................. 13

5.1. No output .......................................................................................................................................................................................................... 13

5.1.1. For voltage output.................................................................................................................................................................................... 13

5.1.2. For current output .................................................................................................................................................................................... 13

5.2. Low Output ....................................................................................................................................................................................................... 13

5.3. High output ....................................................................................................................................................................................................... 14

5.4. Unstable Output................................................................................................................................................................................................ 14

5.4.1. Poor Installation ....................................................................................................................................................................................... 14

5.4.2. Noisy Environment................................................................................................................................................................................... 14

5.5. Calibration......................................................................................................................................................................................................... 14

5.6. Fine Span (Gain) and Zero (Offset) Adjustment Problems .............................................................................................................................. 14

6. PRODUCT CARE...................................................................................................................................................................................................... 15

7. GLOSSARY............................................................................................................................................................................................................... 15

8. SPECIFICATIONS FOR COND SGA/A & COND SGA/D LOAD CELL AMPLIFIERS ............................................................................................. 18

8.1. Parameter......................................................................................................................................................................................................... 18

8.2. Output options .................................................................................................................................................................................................. 19

8.3. Connections...................................................................................................................................................................................................... 19

8.4. Enclosure.......................................................................................................................................................................................................... 19

8.5. Controls ............................................................................................................................................................................................................ 19

8.6. EMC Approvals................................................................................................................................................................................................. 19

8.7. W A R R A N T Y .............................................................................................................................................................................................. 19

8.8. Connection Details ........................................................................................................................................................................................... 20

COND SGA-A & SGA-D Manuel_EN Rev3.doc Page 2 on 20 Rev: 03/08/2006

1. INTRODUCTION

The COND SGA is a Strain Gauge Amplifier, converting a strain gauge input (±10V, ± 5V, 0-2.5-5V, 0-5-10V,

0-20 mA ou 4 -20 mA) to a Voltage or current output – otherwise known as a Signal conditioner.

The COND SGA provides a wide range of signal conditioning for Strain gauges, Load cells and Torque

transducers.

Figure 1.1.

Offered in two versions, the COND SGA-A for 110/230V AC or 18-24V DC operation and the COND SGA-D

which is DC powered only. Transducer SENSITIVITY of between 0.1 mV/V and 30 mV/V are possible. This is

achieved by a combination of gain (span) DIP switches and associated fine adjustment by a potentiometer.

Similarly transducer zero OFFSET and SCALE DEAD BAND of up to 79% can be compensated for in the

module. This is achieved again by a combination of zero DIP switches and associated fine adjustment by a

potentiometer. The module has built-in FILTERS to cancel the field effects of vibration, agitation and

electrically noisy environment. The on-board low pass filter can be switched in and adjusted (from 1Hz to

5kHz) using a series of DIP switches. A wide range of proportional output options for currents and voltages

can be configured by DIP switch settings. Both the AC and DC versions are based on a common board and

are mounted in an IP65 (NEMA 4X) ABS case.

2. INSTALLING THE COND SGA/A & COND SGA/D

2.1. Pre Installation

See Specification details in Chapter 8 for details of Environmental Approvals. Carefully remove the COND

SGA/A unit from its packing. Check that the unit is complete and undamaged.

The COND SGA/A & COND SGA/D units can operated in any industrial environment providing the following

limits are not exceeded:

Operating Temperature -10 ºC to +50 ºC

Humidity 95% non condensing

Storage temperature -10 ºC to +50 ºC

While the unit is sealed to IP65 (NEMA 4X) it is advisable to follow the following installation practice where

possible :

-Minimize vibration

-Do not mount next to strong electrical fields (transformers, power cables)

-Ensure easy access to interior of the module

-Install electrical protection device, as the unit is not internally fused

COND SGA-A & SGA-D Manuel_EN Rev3.doc Page 3 on 20 Rev: 03/08/2006

-Always ensure the lid is properly fitted and all 4 screws tightened

-Always ensure the cable gland is sealing against the cable to maintain the IP (NEMA) rating

2.2. Dimensions

Figure 2.1.

The 4 screws for the lid are captive and must be tightened to maintain the seal.

The holes for the mounting screws in the base are directly behind the screws for the lid.

The box must not be drilled as this would invalidate the IP rating

Allow sufficient space at both sides for the cable entry.

The Nylon 66 cable glands are designed for ROUND cables.

The waterproof entry and strain relief will seal to a higher rating than the enclosure.

Cable diameter should be between 4mm (0.16”) and 7mm (0.27”)

2.3. Cabling

2.3.1. Power Connection

Two power supply options are available :

COND SGA/A: 220/230VAC, 50/60Hz

110/120VAC, 50/60Hz

5WMax.

COND SGA/A & COND SGA/D: 18-24V DC, 5W

(approx. 150mA

fully loaded)

NOTE: The COND COND SGA/A can be powered from AC or DC sources whichever is available.

It is also possible to connect BOTH AC and DC simultaneously for security of power supply.

Figure 2.2.

Standard mains 2 or 3 core cable PVC sheathed (unscreened) cable will suffice for the power.

NOTE: Connect the appropriate power to the COND SGA. For AC powering observe the correct transformer

jumper connections as shown in Figure 2.2 above. (This diagram is also provided inside the lid).

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Connections to the COND SGA/A & COND SGA/D input/output signal and the power supply are made via

2.5mm² field terminal blocks. Cable entry in the cased versions is via glands in the side of the case.

2.3.2. Input (Sensor) Connections

Figure 2.3.

NOTE: Strain excite is Excitation to the transducer.

Strain input is Signal from the transducer.

The Ref 5V/2.5V is generated internally and used for calibration

The cable connecting the sensor to the COND SGA should be shielded.

This typical cable data is provided for information only.

The cable should have 2 x twin twisted cables. Ideally with each pair individually shielded and with an overall

shield.

Country

Supplier Part No Description

UK Farnell 148-539

Individually shielded twisted multipair cable (7/0.25mm)- 2 pair

Tinned copper drain. Individually shielded in polyester tape.

Diameter: 4.19 mm

Impedance: 54 Ohms: Capacitance/m: core to core 115 pF & core to shield 203 pF

UK Farnell 585-646

Individually shielded twisted multipair cable (7/0.25mm)- 3 pair

Tinned copper drain. Individually shielded in polyester tape.

Diameter: 6.86 mm

Impedance: 62 Ohms: Capacitance/m: core to core 98 pF & core to shield 180 pF

UK RS 367-533

Braided shielded twisted multipair cable (7/0.2mm)- 1 pair

Miniature- twin -round Diameter: 4.8 mm

Impedance: 62 Ohms: Capacitance/m: core to core 120 pF & core to shield 210 pF

Table 2.1.

If possible segregate the signal cable from Power Cables; allow a 1meter (3 feet) distance from such cables.

Do not run signal cable parallel to power cables. Cross such cables at right angles.

The ground connection conductor should have sufficient cross-sectional area to ensure a low impedance path

to attenuate RF interference.

COND SGA-A & SGA-D Manuel_EN Rev3.doc Page 5 on 20 Rev: 03/08/2006

2.3.3. Output Connections

Two analogue outputs are available from the COND SGA, proportional DC current and DC voltage.

The ranges available are as follows:

Output Range

DC voltage ±10V NB: Maximum Load on voltage ranges is 2mA

±5V

0 - 10V

0 - 5V

DC current 0 - 20mA NB: Maximum impedance 500R

4 - 20mA

The DC current support both ‘sink’ and ‘source’ modes of operation.

Two jumpers JP1 & JP2 provide the means of selecting the desired mode.

Figure 2.4.

In ‘Sink’ mode the +ve end of the load is connected to the internal +15V supply on the COND SGA and the -

ve end is connected to the COND SGA output. The current through the load is ‘sunk’ by the COND SGA

towards ground (0V).

N.B. In this mode neither connection to the output load is electrically common to the load cell. Select this

option by fitting the two jumpers, JP1 and JP2 to the ‘outside’ positions (See Figure 3.2)

In ‘Source’ mode the +ve end of the load is connected to the COND SGA output and the current is ‘sourced’

by the COND SGA output through the load towards ground (0V). This mode has the advantage that the

negative output connection is common to the load cell ‘- Excitation’ terminal.

Select this option by fitting the two jumpers, JP1 and JP2 to the ‘inside’ positions (See Figure 3.2)

See Chapter 3 for Switch settings and details of SINK & SOURCE jumpers.

COND SGA-A & SGA-D Manuel_EN Rev3.doc Page 6 on 20 Rev: 03/08/2006

3. SWITCH SETTINGS

Switch Positions

e.g. The switches in Figure 3.1 are depicted as ALL ON.

3.1. Output Settings - Switch 4

Use switch 4 to select the required

output and, if required, the low pass

filter and 5V Excitation. (See Tables 3.1

and 3.2)

Figure 3.1.

3.1.1. Output Option

Output Option

Input Range 4-20mA 0 - 20mA 4-20mA 0 - 20mA 0 - 10V 0 - 5V ±10V ±5V

+ Full Scale 20mA 20mA 20mA 20mA 10V 5V 10V 5V

↑↑↑↑↑↑↑↑↑

0 4mA 0mA 12mA 10mA 5V 2.5V 0V 0V

↓↓↓↓↓↓↓

- Full Scale n/a n/a 4mA Note 1 0mA Note 1 0V 0V -10V -5V

Table 3.1.

N.B. Full scale output on the voltage ranges is achieved with a bi-polar (±) input

Note 1 Negative inputs can be accommodated on the current output ranges by setting the ‘Zero’ switch SW2

to +50% (Table 3.8) and setting SW1 to twice the required mV/V setting (Table 3.6).

3.1.2. Switch 4

Analogue Output and Excitation Voltage Options - SW4

SW4 1 2 3 4 5 6 7 8

±10V 0↓0↓0↓X X 1↑=Filter in 1↑Filter out 1↑=10V Exc 0↓=5V Exc

±5V 0↓1↑0↓X X 1↑=Filter in 1↑Filter out 1↑=10V Exc 0↓=5V Exc

0-10V 0↓1↑1↑X X 1↑=Filter in 1↑Filter out 1↑=10V Exc 0↓=5V Exc

0-5V 1↑1↑1↑X X 1↑=Filter in 1↑Filter out 1↑=10V Exc 0↓=5V Exc

0-20mA X X X 0↓0↓1↑=Filter in 1↑Filter out 1↑=10V Exc 0↓=5V Exc

4-20mA X X X 1↑1↑1↑=Filter in 1↑Filter out 1↑=10V Exc 0↓=5V Exc

COND SGA-A & SGA-D Manuel_EN Rev3.doc Page 7 on 20 Rev: 03/08/2006

Filter out X X X X X 0↓1↑1↑=10V Exc 0↓=5V Exc

Filter in X X X X X 1↑0↓1↑=10V Exc 0↓=5V Exc

10V Exc X X X X X 1↑=Filter in 1↑Filter out 1↑

5V Exc X X X X X 1↑=Filter in 1↑Filter out 0↓

Table 3.2.

Switch settings (0 = Off 1 = On X = Don’t Care)

Important: Low pass filtering is switched into operation by setting SW4/6 ‘ON’↑and SW4/7 ‘OFF’↓.

Reverse these settings to bypass the filter.

It should be noted that either one of these switches MUST be on but not BOTH

3.1.3. Example :- 0-10 Volt output with no filter required.

SW4 1 2 3 4 5 6 7 8

0-10V 0

↓

↑

↓

↑

Table 3.3.

3.2. Output Filter Settings –Switch 3

The COND SGA incorporates a second order (-12dB/oct) low pass filter which can be switched in to improve

the performance and output signal quality in electrically noisy environments. It can also be used to reduce the

effects of high frequency fluctuations in the load or applied force to the load cell. The cut off frequency of the

filter is set by the DIP switch SW3 as illustrated in the table below

3.2.1. Switch 3

SW3 1 2 3 4 5 6 7 8

1Hz 0

↓

↑

5Hz 1

↑

↓

↑

10Hz 1

↑

↓

↑

50Hz 1

↑

100Hz 0

↓

500Hz 1

↑

↓

↑

↓

800Hz see note**

1kHz 1

↑

↓

↑

↓

5kHz 1

↑

↓

Table 3.4.

** Note: A SECONDARY low pass filter, with a cut off frequency of 800Hz, can be switched into the COND

SGA input by fitting a link to JP3 (see Figure 3.2)

Important: Low pass filtering is switched into operation by setting SW4/6 ‘ON’↑and SW4/7 ‘OFF’↓.

Reverse these settings to bypass the filter.

It should be noted that either one of these switches MUST be on but not BOTH

SW4

COND SGA-A & SGA-D Manuel_EN Rev3.doc Page 8 on 20 Rev: 03/08/2006

3.2.2. Example : The Switch Settings for a cut-off frequency of 50 Hz setting is illustrated below.

Note: SW4/6 must be ‘ON’ and SW4/7 must be ‘OFF’.

SW3

1 2 3 4 5 6 7 8

50Hz 1

↑

Table 3.5.

3.3. Output Current Mode and Input Filter Settings – Jumpers JP1, JP2 & JP3

Refer to Figure 2.4 for details of wiring connections to J1.

Figure 3.2.

3.4. Span (Gain) Setting Switch 1

Ranges 1 to 60 - from 0.06 mV/V to 30.30 mV/V

↑= ON (1) ↓= OFF (0). SW1/8 switches on the shunt cal function – see Table 3.8

SW3

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3.4.1. SW1

Table 3.6.

COND SGA-A & SGA-D Manuel_EN Rev3.doc Page 10 on 20 Rev: 03/08/2006

3.4.2. Example : A strain gauge has a sensitivity of 2.809 mV /V

Select Switch Setting number 28 from Table 3.6 and fine tune with potentiometer PI

SW1 1 2 3 4 5 6 7 8

2.63 mV/V 0

↓

↑

↓

Table 3.7.

Refer to Chapter 4 for calibration details.

3.5. Shunt Calibration Switch SW1/8

SW1/8 connects a 120k 50ppm surface mount resistor across the ‘+Excitation’ and ‘+ Input’ terminals of the

COND SGA. This shunts one arm of the connected load cell to produce a known change in output which can

be used for calibration or checking the integrity of the load cell and associated wiring.

SW1 1 2 3 4 5 6 7 8

Shunt Cal ON x x x x x x x 1

↑

Shunt Cal OFF x x x x x x x 0

↓

Table 1.8.

The 120k resistor can be taken out of circuit and replaced by a user defined leaded component by carefully

cutting the fine link as shown in Figure 3.3. Use the right hand pad and either of the left hand pads to fit the

new component.

The surface mount resistor can be reinstated by re-connecting the two pads either side of the cut link.

Figure 3.3.

3.6. Zero (Offset) Setting Switch SW2

This offset can be used to compensate for the transducer zero error, to tare the scale dead load or to shift the

output. These settings allow the user to calibrate a zero offset. The range allows for up to 79% of the span.

Potentiometer P2 provides fine adjustment.

SW2 1 2 3 4 5 6 7 8

% + ve Offset - ve Offset 40% 20% 10% 5% 2% 1%

Table 3.9.

SW1

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