MEC 320 GENSET CONTROLLER
PM079 Rev 0 07/06/08 15 Thomson Technology
General block mode description
When the block mode is selected, the unit is locked for certain actions. This means that it cannot
start the gen-set or perform any breaker operations.
To change the running mode from the display, the user will be asked for a password, before the
change can be made. It is not possible to select ‘block mode’, when running feedback is present.
The purpose of the block mode is to make sure that the gen-set does not start for instance
during maintenance work.
If the digital inputs are used to change the mode, then it is important to know that the input
configured to block mode is a constant signal. So, when it is ON the unit is in a blocked state,
and when it is OFF, it returns to the mode it was in before block mode was selected.
Flowcharts
Using flowcharts, the principles of the most important functions will be illustrated in the next
sections. The functions included are:
•
Mode shift
•
MB open sequence
•
GB open sequence
•
Stop sequence
•
Start sequence
•
MB close sequence
•
GB close sequence
•
Load take over
•
Automatic Mains Failure
•
Test sequence
Alarms are not influenced by block mode selection.
The gen-set can be star
ted from the local engine control panel, if such is
installed. Therefore, Thomson Technology recommends to avoid local
cranking and starting of the gen-set.
If block mode is selected using the display after the digital block input is
activated, the MEC 320 will stay in block mode after the block input is
deactivated. The block mode must now be changed using th
mode can only be changed locally by display or digital input.
Before the running mode is changed it is important to check that persons are
clear of the gen-set and that the gen-set is ready for operation.
The flowcharts below are for guidance only. For illustrative purposes the
flowcharts are simplified in some extent.
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