Fairford Synergy SGY-401, Quick Start Manual

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A separate, correctly rated AC53 bypass contactor may be used to provide thyristor bypass .
The contactor must be connected in parallel with the synergy
™
starter as shown in the diagrams
below.
Soft-Starting and Soft-Stopping remain active as normal. At the completion of the starting
ramp a bypass contactor is closed, effectively removing the thyristors from circuit, which in turn
eliminates heating losses.
The contactor is controlled by a programmable relay set to ‘End of Start’ (terminal 44), ensuring
that bypassing occurs only occurs after completion of the start, and the motor terminal voltage
is at supply voltage.
External Bypass
K3
K1
L1 L2 L3
L1
L2
L3
T1 T2 T3
synergy
TM
Motor
Mains Supply
Bypass
Contactor
Circuit Contactor
Power Circuit Diagram