ABB REL 551 2.3 Series - Page 111

105
Monitoring of AC analogue
measurements
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Stabilized ac current and voltage generators and corresponding current, voltage, power
and frequency meters with very high accuracy are necessary for testing the alternating
quantity measuring function. The operating ranges of the generators must correspond
to the rated alternate current and voltage of each terminal.
Prepare the terminal for verification of settings as outlined in section “Preparing for
test” in this chapter. Connect the generators and instruments to the corresponding input
terminals of a unit under test.
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Check that the values presented on the HMI unit correspond to the
magnitude of input measured quantities within the limits of de-
clared accuracy. The mean service values are available under the
submenu:
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The phasors of up to five input currents and voltages are available
under the submenu:
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The operation of ADBS or IDBS function can be checked sepa-
rately with the RepInt = 0 setting. The value on the HMI follows
the changes in the input measuring quantity continuously.
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The output contact changes its state when the changes in the input
measuring quantity are higher than the set values HIWARN, HI-
ALARM, or lower than the set values LOWWARN, LOW-
ALARM.