MEC 320 GENSET CONTROLLER
PM079 Rev 0 07/06/08 10 Thomson Technology
Diagram, load take over - example
Back synchronizing OFF (Open Transition)
When the start command is given, the gen-set will start. When the frequency and voltage is OK,
the mains breaker is opened and the generator breaker is closed. Now the generator supplies
the load, until the stop command is given. Then the generator breaker opens and the mains
breaker closes. The gen-set cools down and stops.
A 4-20mA transducer is used for indication of the power imported from the mains.
Semi-auto mode
When the generator breaker is closed, and the mains breaker is opened, the unit will use the
nominal frequency as set point for the speed governor.
When the generator is paralleled to the mains, it will be controlled, so the imported power from
the mains will be kept at 0 kW.
Test mode description
Manual mode description
kW
S
ta
rt
s
ig
na
l
S
to
p
si
gn
al
Mains power
Generator power
M
B
o
pe
ns
G
B
o
pe
ns
t
The load take over mode can be combined with the short time parallel. In that
case, the generator and the mains breakers will never be closed at the same
time for a longer period than the adjusted ‘short time parallel’ time.
If the imported load is higher than the nominal gen-set an alarm appears, and
the load take over sequence is paused.
If the imported load is higher than the nominal gen-set power, an alarm appears
and the load take over sequence is paused.
See general semi-auto mode description on page 12.
See general test mode description valid for all gen-set modes on page 13.
See general manual mode description valid for all gen-set modes on page 13.
Summary of Contents for MEC 320
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