FS450R12KE3/AGDR-71C ABB distributed control system industrial DCS module card

Description

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Measurement function
The current measurement function (ammeter) is present on all versions of the SACE PR122 unit.
The display shows histograms showing the currents of the three phases and neutral on the main
page. Furthermore, the most loaded phase current is indicated in numerical format. Earth fault
current, where applicable, is shown on a dedicated page.
The latter current value takes on two different meanings depending on whether the external
toroidal transformer for the “Source Ground Return” function or the internal transformer (residual
type) is connected.
The ammeter can operate either with self-supply or with an auxiliary power supply voltage. In the
latter case the display is rear-lit and the ammeter is active even at current levels lower than 160A.
Accuracy of the ammeter measurement chain (current sensor plus ammeter) is no more than
1.5% in the 30% – 120% current interval of In.
– Currents: three phases (L1, L2, L3), neutral (Ne) and earth fault; :
– Instantaneous values of currents during a period of time (data logger);
– Maintenance: number of operations, percentage of contact wear, opening data storage (last
20 trips and 80 events).
When the optional PR120/V is connected the following additional measurement function are
present:
– Voltage: phase-phase, phase-neutral and residual voltage
– Instantaneous values of voltages during a period of time (data logger);
– Power: active, reactive and apparent
– Power factor
– Frequency and peak factor
– Energy: active, reactive, apparent, counter