Atlas Copco SAPE, Instruction Manual

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After connecting two generators in parallel, more generators can be
added.
Once two (or more) generators are connected in parallel, they can
be treated as if they were one unit.
– Shut down or disconnect the load or make sure that the load is sta-
ble.
– Shut down the generators that are already in operation. Make sure
not to change the settings on these generators.
– Connect the extra generator to the parallel connection of the first
generators, treating these generators as one unit.
– Make sure that all main circuit breakers Q1 are switched OFF.
– Carry out the actions described in “Before starting parallel opera-
tion” for the extra generator.
– Start up the first generator, close its circuit breaker Q1 and push the
button “Breaker/Contactor close” on the corresponding SAPE.
– Start up the second (possibly third, fourth, ...) generator, close its
circuit breaker(s) Q1 and push the button(s) “Breaker/Contactor
close enable” on the corresponding SAPE unit(s). These units can
now be considered as one unit.
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– Switch off and disconnect the load.
– Push the buttons “Breaker/Contactor open” on both SAPE units.
– Switch off the main circuit breakers Q1 of both generators.
– Let the engines run for about 5 minutes to cool them down.
– Shut down the generators one by one.
Do not connect more than 7 generators in parallel.
Once the extra generator is synchronized, it can be
used as a standby unit. If the load exceeds the nomi-
nal load of the first generator(s), the standby unit
can be put in parallel operation by closing the circuit
breaker of the corresponding SAPE.