SGA21 Manual - Tension Measurement, inc.
Contents
1. 2 set points thanks to an additional electronic board 6 1 Presentation _SGA21 28 DIN rail model SGA21 1 Board model 130 6 2 General specifications of set points _Number of set points o 2 Adjustment Potentiometers 5 Technology Photorelays lt On state current max 40 C 0 4 A l T bo Off state voltage 55 V g i On state resistance 2 Q Isolation voltage 2500 Vrms Functionning direction Selected Hysteresis 1 1 0 2 FS Holding time 5 600 ms Latch Yes i Response time 7 ms FS Full scale Page 6 8 6 3 Wiring and setting devices positionning Measurement points for set points 6 8 Set point status LEDs OV reference for measurement points Set point adjustment potentiometers Logic Pasitive Negative q Hysteresis Min Max Logic Positive Negative Hysteresis Min Max Holding tine Min Max Holding tine Min Max Latch Yes no Latch Yes no SP2 Reset Latch connector 6 10 Set points outputs 1 amp 2 6 4 Note Each set point can be adjusted separately 6 4 Photorelays connections Photorelay 2 Photorelay 1 6 5 Photorelays functioning direction The photorelays can be used with positive or negative logic For this put or remove the corresponding jumper Logic Positive Negative 6 6 Set points functioning Positive signal negative signal Voltage Voltage Time Time Relay2. output Relay output Ls Crammer 1 1 Page 7 8 6 7 Hysteresis To avoid oscillation of the set point relays a hysteresis is applied jumper Hysteresis Min Max Ifthe jumper is removed the hysteresis value is 20mV 0 2 of FS Ifthe jumper is in place by default the hysteresis value is 110mV 1 1 of FS 6 8 Set points adjustment The set points can be ajusted with experiments or by using a voltmeter Experimental adjustment Apply on the load cell the load corresponding to the wanted set point Adjust the potentiometer until the state of the corresponding light changes Adjustment with voltmeter Connect the voltmeter between the measurement points V1 or V2 and GND voltmeter input connected to GND Adjust the corresponding potentiometer to the desired set point voltage The adjustment error is lt 2 with maximum hysteresis and lt 0 5 with minimum hysteresis Example the SGA21 is adjusted for 10V or 20mA output with max load For a requested set point at 80 of max load adjust the potentiometer SP1 or SP2 to obtain 8V on measuring point 6 9 Holding time It is possible to maintain the set point during a minimum time depending on the Holding timeMin Max jumper position Jumper in place Holding time 5ms Jumper removed Holding time 600ms Set point l l l Time l l i t lt Holding time Relay output 1 l l lt M Holding time
3. 4 20mA set the sensor sensitivity jumper according to the following table Note The load cell sensitivity is indicated on the quality control sheet attached with the load cell Positionning of configuration jumper Sensor sensitivity mV V Jumper Sensor power Sensor power Sensor power position supply 3V supply 10V supply 5V 0 50 gt 0 66 0 15 gt 0 20 0 30 gt 0 40 0 66 gt 0 93 0 20 gt 0 28 0 40 gt 0 56 0 93 gt 1 30 0 28 gt 0 39 0 56 gt 0 78 i a Example Load cell with 500kg capacity and 2mV V sensitivity 3 40 gt 4 65 1 02 gt 1 40 2 05 gt 2 80 Maximum load to be measured 200kg for 10V 6505800 1055265 39035320 8 200kg 500kg x 2mV V 0 8mMV V 1 30 gt 1 80 0 39 gt 0 54 0 78 gt 1 08 For X position put the jumper between 8 and 9 123456789 Position 1 gt a O O O o Om lt Position X OO0O00000 The jumper will be set in position number 3 Page 4 8 4 6 Zero adjustment l e Verify that no load except the load receptor is applied on the load cell e Approach the zero with P2 potentiometer and make a fine adjustment with P3 potentiometer Analog output 0 10V voltmeter displays OV Analog output 4 20mA ampere meter displays 4mA 47 Span adjustment e After zero adjustment apply a known load on the load cell e Adjust span with P1 potentiometer until the analog output signal complies with the applied load e Remove the load and veri
4. Analog Strain Signal Conditioner SGA21 SGA21 2S Tension Measurement Inc P O Box 740755 Arvada CO 80006 0755 USA Web www tension measurement com User Manual Ph 303 465 1011 Fax 303 466 9761 Email tension tension measurement com Page 1 8 1 Introduction The SGA21 device is an analog sensor conditioner It is mainly used with strain gage sensors such as load cells torque sensors or pressure sensors The SGA21 2S version includes 2 adjustable set points 2 Presentation SGA21 DIN rail model SGA21 1 Board model 130 16 _SGA21 3 IP65 Housing model 80 24 4 Min sensor impedance voltage 3 5V voltage 10V Span adjustment Max supply current SGA21 SGA21 2S Voltage output Current output Load impedance Voltage output Load impedance Current output Output capacitive load Filter jumper selection Bandwidth up to FS Full Scale Page 2 8 4 Wiring and setting devices positioning 4 6 wire sensor selection Sensor supply voltage selection 41 amp 5 Cal push button 4 8 8 9 10 11 12 Power supply led O Sensor connection Zero adjustment 4 1 amp 5 4 6 Power supply and output signal connection 4 3 Sensor sensitivity selection 4 5 Span adjustment 4 7 Filtering selection 4 4 4 1 Sensor connections The SGA21 is able to manage up to 4 load cells 350Q connected in parallel through a junction box Excitaiton ju
5. It is possible to latch the set point by engaging the latch function To enable the latch function just remove the Latch Yes No jumper Release of latched set point is possible by powering off the SGA21 or by realizing a short circuit on he Reset latch connector Reset latch connector TENSION MEASUREMENT INC P O BOX 740755 Ph 303 465 1011 ARVADA CO 80006 0755 USA Fax 303 466 9761 Page 8 8 Web www tension tension measurement com Email tension tension measurement com
6. fy the zero adjustment If necessary make a new zero adjustment followed by a new span adjustment 4 8 Shunt calibration control If the load cell specifications are known Output resistance Z and Sensitivity S It is not necessary to put a calibrated weight on the load cell for span adjustment You just have to Connect the load cell Select the load cell sensitivity 4 5 Adjust the zero 4 6 While maintaining pressure on the push button Cal adjust the output voltage or current with P1 potentiometer The adjustment value is defined by the following formula For 0 10V analog output Viv Z 1 S x 0 025 For 4 20mA analog output lma Z 1 S x 0 04 4 With Z output load cell resistance Q S Load cell sensitivity mV V Release the push button Cal and check the zero adjustment If necessary make a new zero adjustment and start again this process Page 5 8 5 Optional potentiometer input To obtain a 0 10V or 4 20mA output signal for the total potentiometer coarse set up the SGA21 as follow Sensor supply voltage Put the jumper in position 3V Potentiometer sensor e Sensor sensitivity Put the jumper in position 9 e Span adjustment Make a fine adjustment with P1 potentiometer 2 jumpers set in place 6 Set points option SGA21 2S The SGA21 2S version includes all the previous functionalities and in addition the possibility to manage
7. mper must be set to 5VDC or 3VDC for 4 load cell systems e Sensor connection 4 wire sensor The two jumpers stay in place 6 wire sensor The two jumpers are removed 4 wire sensor 2 jumpers set in place 2 jumpers removed 4 2 Sensor supply voltage Set the jumper in position corresponding to the selected voltage 3VDC 5VDC or 10VDC The load cells are generally supplied in 5V default value 3V voltage is useful for some particular sensors 10V is recommended for low sensitivity or low output signal sensors Warning With 10VDC supply voltage only 2 load cells 350 Q can be connected For load cells used in ATEX area and protected by Zener barriers do not use 10V supply voltage 43 Power supply and analog outputs Power supply 24VDC 4 Current analog output 4 20mA Voltage analog output 0 10V or 10V 4 20mA current analog output and 0 10V voltage analog output can be used simultaneously The Gnd points are internally connected in the circuit board 4 4 Sensor signal filtering The filter is a second order low pass type with 10Hz cutting frequency The filter is generally used to eliminate troubles caused by vibrations of the installation If a faster response time is necessary it s recommended to disable the filter e Enable filtering without filter Jumper to set filter filter 4 5 Sensor sensitivity selection To get the correct signal on the analog output 0 10V or
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