Parallel Operation - Mecc Alte ECP series Betriebs- Und Wartungsanleitung

ECO - ECP MANUAL
ENGLISH
ELECTRICAL CONNECTIONS

PARALLEL OPERATION

Should the alternators be required to operate in parallel, it is ne-
cessary to add a paralleling device to ensure equal droop of ge-
nerator output voltages.
This ensures that if the machines are operated separately, the
voltage droop (4% approx.) is equal when switching from no-load
to full load.
The parallel device is fitted as standard on 40 - 43 - 46 models,
therefore when two or more of these units must function in paral-
lel, it is sufficient to remove the bridge which shortcircuits the se-
condary winding of the parallel device.
On smaller models this device is mounted on request or it can be
added (except for ECP28/4) by the client himself following the in-
structions of tables 14-16-18-20.
After the device has been mounted, check whether the connec-
tion has been properly made; make sure that there is a voltage
drop of approximately 4% in the machines when they function in-
dividually switching at rated speed and cosφ 0.8 from no-load to
full load operation.
HOW TO MOUNT THE PARALLEL DEVICE
Referring to tables 14-16-19 mount parallel device as indicated.
Connect the power turns in series with phase.
The numbers of turns to be wound on the transformer will be indi-
cated in the instruction accompanying the transformer itself.
The secondary winding of the parallel transformer must be con-
nected in series to the sensing of the electronic regulator as
shown on tables 4 - 5 page 32.
In order to activate the parallel device remove the bridge which
shortcircuits the secondary winding of the device itself as shown
in the above mentioned tables.
NOTE
When requesting a parallel device, it is necessary to indicate the
nominal data of the alternator on which the device will be applied.
After all the electric connections have been made and only after
all the protections have been put in place, can the system be
started.
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ECO-ECP iMANUAL December 2013 Rev. 03