Synergy Series Soft Start User Manual
MAN-SGY-017. Version 01. 27/06/2016
182
has a statutory obligation to provide a guide for compliance with this directive. For Synergy, this guidance is
given in the EMC guide which is section 9 of this manual. It is essential that users and installers understand
and comply with the requirements described in these sections.
8.1.14 Fuses
Circuit protection fuses should be rated at twice the motor rated current for normal low inertia
applications. See also section 3.2.2 relating to high inertia loads. Semiconductor fuses are available for the
short circuit protection of the thyristors in Synergy. See section 2.4 of the Electrical Installation manual for
Semiconductor fuse recommendations and details of the Overload incorporated into Synergy.
8.2 Rules for Specific Applications
8.2.1 In-Delta Operation
The synergy
TM
control system allows the soft-start to be installed “in the delta” connections of the motor,
which can permit the use of a lower current rated unit. However, in this mode of operation, it is important
that the soft start is connected in accordance with the relevant wiring diagram. The connection diagram in
figure 2.3.2 of the Electrical Installation manual gives detailed instruction for this configuration. If motor
rotation is incorrect, the connections should be changed as detailed in fig 2.3.2. It should be noted that six
connections are required between the motor and soft-start. Parameter P6 must be set to 1 for delta mode
which also disables the optimising.
8.2.2 High Inertia Loads
High inertia loads such as centrifugal and axial fans, grinders, flywheel presses, etc., may require a larger
size of soft-start than the motor. For example, a 75kW starter may be needed for a 55kW motor. This is
necessary due to the extra heat produced by the thyristors due to the extended start times and/or higher
over-currents. If very high inertia loads are involved, then an analysis of the starting characteristics should
be made. This will require accurate data about the motor speed-torque and speed-current characteristics
as well as the load characteristics. For further information, consult your supplier. Consideration must also
be given to thermal overload and fuse protection systems when extended start times are involved. This
must be as for heavy duty starting, as a standard thermal overload will trip under these conditions. A
heavy-duty start thermal overload or an electronic overload with dual settings for start and run is
recommended. Modern HRC motor fuses will allow for some overload during the start, but the fuse curve,
giving time/current data, will give an indication of suitability for the particular application.
8.2.3 Frequent Starting
High starting frequencies require careful consideration of the soft-start thermal capabilities. In many cases
a standard sized Synergy may be suitable as start times are generally shorter for this type of application. If
this is not the case then a larger soft-start may be required. (Please refer to Fairford for further
information.)
8.2.4 iERS
Drives which operate for long periods of time at less than 35% of their rated capacity can benefit from the
energy saving function (iERS optimising) of Synergy which will adjust the thyristor triggering to reduce the
excitation losses of the motor. This will lower the running temperature of the machine and help to extend
it’s life.
8.2.5 Soft-Stopping
Soft-stopping can reduce positive surge pressures in pipelines on shutdown. It is necessary to make sure
that the ramp-down time is long enough to remove the energy from the fluid before the firing of the
thyristors is stopped, otherwise the surge pressure may still be present. Soft-stopping can also be
successfully applied to loads such as conveyer belt systems where sensitive items such as bottles are being
transported.
8. Applications (continued)
Summary of Contents for synergy
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