FI820F ABB distributed control system industrial DCS module card

Description

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User interface
The user communicates directly with the trip unit in the trip parameter preparation stage by
means of the dip switches.
Up to four LEDs (according to the version) are also available for signalling.
These LEDs (one for each protection) are active when:
• a protection is timing. For protection L the prealarm status is also shown;
• a protection has tripped (the corresponding LED is activated by pressing the “Info/Test”
pushbutton);
• a failure in connection of a current sensor or in the opening solenoid is detected. The indication
is active when the unit is powered (through current sensors or an auxiliary power supply)
• wrong rating plug for the circuit-breaker.
The protection tripped indication works even with the circuit-breaker open, without the need for any
internal or external auxiliary power supply. This information is available for 48 hours of inactivity after
the trip and is still available after reclosing. If the query is made more than 48 hours later it is
sufficient to connect a PR030/B battery unit, PR010/T, or a BT030 wireless communication unit.
Communication
By means of the BT030 wireless communication unit, PR121/P can be connected to a pocket PC
(PDA) or to a personal computer, extending the range of information available for the user. In
fact, by means of ABB SACE’s SD-Pocket communication software, It is possible to read the
values of the currents flowing through the circuit-breaker, the value of the last 20 interrupted
currents, and the protection settings.
PR121 can also be connected to the optional external Local Device LD030 DO, for the remote
signalling of protections alarms and trips, and to HMI030, for the remote user interfacing.
Setting the neutral
Protection of the neutral can be set at 50%, 100% or 200% of the phase currents. Settings above
50% can be selected for E1-E2-E3-E4/f and E6/f. In particular, setting the neutral at 200% of
phase current requires protection L to be set at 0.5In in order to respect the current-carrying
capacity of the circuit-breaker. The user can also switch the neutral protection OFF. When threepoles circuit-breakers with external neutral current sensor are used, a setting above 100% for
the neutral does not require any reduction in the L setting.
Test Function
The Test function is carried out by means of the info/Test pushbutton and the PR030/B battery
unit (or BT030) fitted with a polarized connector housed on the bottom of the box, which allows
the device to be connected to the test connector on the front of PR121/P trip units.
The PR121/P electronic trip unit can be tested by using the SACE PR010/T test and configuration
unit by connecting it to the TEST connector.