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16
16.1
132
Supervision of mA input quantities (MI)
Supervision of mA input quantities (MI)
A stabilized direct current generator and mA meter with very high accuracy for measurement of
direct current is needed in order to test the dc measuring module. The generator operating range
and the measuring range of the mA meter must be at least between -25 and 25 mA.
Prepare the terminal for verification of settings as outlined in
this chapter. Connect the current generator and mA meter to the direct current input channels to
be tested.
Verifying the settings
Procedure
1.
Consider the need to block output signals.
2.
Check that the values presented on the HMI module corresponds to
the magnitude of input direct current within the limits of declared ac-
curacy.
The service value is available under the submenu:
Service Report/I/O/Slotnm-MIMx/MIxy-Value
where:
nm
represents the serial number of a slot with tested mA input module
x
represents the serial number of a mA input module in a terminal
y
represents the serial number of a measuring channel on module x.
3.
Check the operation of ADBS or IDBS function when applicable.
Compare with the expected values.
The operation of ADBS or IDBS function can be checked separately with
the setting of RepInt = 0. The value on the HMI must change only when
the changes in input current (compared to the present value) are higher
than the set value for the selected dead band.
4.
Check the operating monitoring levels by changing the magnitude of
input current and observing the operation of the corresponding out-
put relays.
The output contact changes its state when the changes in the input mea-
suring quantity are higher than the set values RMAXAL, HIWARN, HI-
ALARM, or lower than the set values LOWWARN, LOWALARM,
RMINAL.
Chapter 13
Verifying settings by secondary
section 2 "Preparing for test"
injection
in
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