54
SOCOMEC - Réf.: 678 623 G GB
BASIC PRODUCT USE (continued)
Turn the keyswitch from Manual to
Automatic position.
The automatic mode must be activated
as soon as automatic starting of the
generator and source switching is
required after loss of mains condition.
The unit integrates a power capacitor
source to provide enough power during
black out (loss of mains) to wait for gen-
erator starting. (It does not have power to
drive the switch to zero position). Further
external protection will be required if
“phasing” is a concern.
AUTOMATIC MODE
Once in automatic mode it is possible:
• To access programming and visuali-
sation menus
• To start off load or on load testing
• To start a loss of Mains sequence
• To start a Mains return sequence
Possible actions
• As soon as the unit is switched from
Manual to Automatic mode, the auto-
matic cycle is started.
• Mains and Generator voltage &
frequency are verified to define the
new stable position of the switch.
• The same table is considered after a
complete power off action (Power
Cap must be completely discharged
= 3 minutes).
Manual-automatic mode/power return condition
Programming Visualisation
Off load
testing
On load
testing
Loss of Mains
sequence
Mains Return
sequence
AUTO MODE
Original switch position
Status of supply
New position
Mains
Available, genset available or unavailable
Mains
Mains
Mains unavailable for 2MT time period,
Genset. If genset unavailable start
genset available or unavailable
genset first and wait for AT timer
period before transfer
Genset
Genset on load, mains unavailable
Genset
Genset
Genset on load, mains available
Mains
for 1MT time period
Zero
Mains available, genset unavailable
Genset to count down 1MT before
transfer to Mains
Zero
Mains available, genset available
Mains
Zero
Mains unavailable, genset available
Genset
Zero
Mains unavailable, genset unavailable
No action (because no supply).
When supply becomes available
change to mains or genset
New stable switch position:
The switch immediately transfers as soon as the keyswitch is turned from
Manual to Automatic mode or as soon as Power comes back.
Read timers definition for 1MT or 2MT
understanding.
