Flowserve LRR1-40 TDS Control Unit - Manual (Page 30)

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System Faults
– co ntinued –
Action against high frequency interference
Due to the digital signal evaluation we recommend the following measures for
interference suppression in installations susceptible to electromagnetic interference
(e.g. interference caused by phase asynchronous switching operations):
H. F. Interference suppression of voltage supply
Install ferrite ring just before the control equipment. Loop supply lines L and N as often
as possible (5-10 times) through the ring. Several control units that are located next to
each other can also be fed by this supply line.
L
Fig. 7
Ferrite ring
N
230V
Control unit Control unit