FEN-31 ABB distributed control system industrial DCS module card

Description

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Self-diagnosis
The PR122 range of trip units contains an electronic circuit which periodically checks the
continuity of internal connections (opening solenoid or each current sensor, including the
Source Ground Return when present).
In the case of a malfunction an alarm message appears directly on the display. The Alarm is
highlighted by the Alarm LED as well.
Residual Current
Different solutions are available for integrated residual current protection. The basic choice is
PR122/P-LSIRc, which has all the characteristics of PR122/P-LSI and residual current protection
as well. When additional features are required, the solution is PR122/P LSIG with the additional
PR120/V module (see next paragraph). Using this configuration, residual current protection is
added to a unit, having the features of PR122/P-LSI and all the add-ons described for the PR120/V
module, such as voltage protection and advanced measurement functions. In this case the Rc
protection can be set as an alternative to the G protection.
Residual current protection acts by measuring the current from the external dedicated toroid
and must be ordered separately. Rc protection can be activated only if the special rating plug for
residual current protection is present.
Test Functions
Once enabled from the menu, the “info/Test” pushbutton on the front of the trip unit allows
correct operation of the chain consisting of the microprocessor, opening solenoid and circuitbreaker tripping mechanism to be checked.
The control menu also includes the option of testing correct operation of the display, signalling
LEDs, and electrical contacts of the PR120/K trip unit.
When the auxiliary power supply is not present, the PR030/B unit can perform the trip test.
By means of the front multi-pin connector it is possible to apply a SACE PR010/T Test unit which
allows the functions of the PR121, PR122 and PR123 ranges of trip units to be tested and
checked.
User interface
The human-machine interface (HMI) of the device is made up of a wide graphic display, LEDs,
and browsing pushbuttons. The interface is designed to provide maximum simplicity.
The language can be selected from among five available options: Italian, English, German, French
and Spanish.
As in the previous generation of trip units, a password system is used to manage the “Read” or
“Edit” modes. The default password, 0001, can be modified by the user.
The protection parameters (curves and trip thresholds) can be set directly via the HMI of the
device. The parameters can only be changed when the trip unit is operating in “Edit” mode, but
the information available and the parameter settings can be checked at any time in “Read”
mode.
When a communication device (internal PR120/D-M and PR120/D-BT modules or external BT030
device) is connected, it is possible to set parameters simply by downloading them into the unit
(over the network for PR120/D-M, by using a PDA or a notebook for PR120/D-BT and BT030).
Parameterisation can then be carried out quickly and automatically in an error-free way by
transferring data directly from DocWin.
Indicator LEDs
LEDs on the front panel of the trip unit are used to indicate all the pre-alarms (“WARNING”) and
alarms (“ALARM”). A message on the display always explicitly indicates the type of event
concerned.
Example of events indicated by the “WARNING” LED:
– unbalance between phases;
– pre-alarm for overload (L1>90%);
– first temperature threshold exceeded (70 °C);
– contact wear beyond 80%;
– phase rotation reversed (with optional PR120/V)