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Calibration of U137, U235 & 237 Series Weight Indicators.
Precautions when installing!
The transducer signal inputs are easily damaged and must not be touched or left open with power on.
0VD is connected to 0VA. Both must only be connected to GND once, normally in the power supply at W1.
Shielded cables must always be used, J2 preferably double shielded, with twisted, shielded pairs. The shields must
always be connected at both ends. It is normally not done inside the transducer. The cable hoods must be of metal or
metallized and connected to the shield at the cable clamp. Filter D-sub, especially J2, improves the immunity against
strong radio frequency signals. Heavy electrostatic discharge may happen, when weighing big containers, trucks,
plastic material or cases, especially when moving and in winter time. In this case, a separate ground cable, 2.5 to
2
10mm , must be drawn parallel with the transducer cable to a screw on the indicator case.
All external connections must be made in separate grounded metal boxes.
Beware of high temperature sources, as the signal is very sensitive to temperature gradients.
The indicator must be well protected against high humidity, dust and dirt. Avoid to touch the boards.
When the displayed weight is unstable, always check connections, especially shield and ground.
Weight change (flow) function.
The weight change with respect to an external signal or during an internal time, selectable between 0.1 and 1000
seconds, may be measured with U137 and 237 series indicators.
Cs13:=1 Change with respect to a signal on the CTS input, minimum 100ms long.
Cs13:=2 Change every measurement cycle.
Cs13:=3 Change during 100 measurement cycles.
If
W is the displayed weight change, the average weight change per second is:
Cs13:=2
Cs08:1
10 W
Cs08:4
W
Cs08:7
W/10
Cs08:1
Cs08:4
Cs08:7
{F} {NET/GROSS} switches between gross weight mode and weight change mode.
The weight change mode is indicated by the COUNT indicator.
Count mode does not work.
The setpoints are compared with the displayed weight change, if Cs14:0 is chosen.
No mean value is calculated.
Pictures:
U2370
U2371
U2375
U2379
Cs13:=3
Cycle s
0.1
1
10
W/10
10
W/100
100
W/1000
1000
U2372
Date:141027 B01950 9(10)
U1370
U2373
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