Operation Manual EMGZ 490
15.12.2015
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Example:
Fsys N = 1000N; Fist N = 500N; Fist mV = 2.25mV (orr 1486)
Note
The mV values in the formula can be replaced by the binary values of the measuring
system (always 5945). The mV value (9 mV) is thus replaced by 5945. The measured
force can be determined using a voltmeter. It replaces the binary value (first digit).
This calculation method is also used by the FMS Calculator tool. Thus it is possible to use the
gain value calculated by the FMS Calculator directly in the calibration. The gain value is then
entered in the parameter set of the amplifier (see chapter 8.2 “Parameter Setting”).
In this
case the calibration procedure described in chapter 4.3 can be skipped. However, FMS
recommends using the traditional method with the weight (chapter 4.2 and 4.3) since it
delivers the most accurate results.
4.5
Limit Violations
The amplifier checks the analogue input and output on limit violations. It checks
whether the force sensor is mechanically overloaded (overload test). At the output, it is
checked whether the voltage output over or under shoots the physically possible value
in relation to the amplified input.
A ) Overload Test
The overload test is performed with the raw data received from A/D-converter. It is
therefore not related to a particular force and can be used regardless of the installed
system.
Test Rules:
The FMS force sensors deliver at the rated nominal force at the output 9mV.
The maximum load at the mechanical hard stop is 12.4mV. The amplifier checks the
overload in the positive measuring direction (red point) as well as in the negative
direction. The limits are therefore 12mV respectively. -12mV. Upon reaching one of
these limits, the Status Bit is set to Overload. The status Bit is reset, if the measured
value falls 0.5 mV below the limits.
9mV * 500N
V =
= 2.000
1000N
*
2.25mV
