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Synchro-check and energising-check
(SYRW)
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The line voltage (U-line 1) is connected as a single-phase voltage to the analog input
UL1.
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The external fuse-failure signals or signals from a tripped fuse switch/MCB are con-
nected to binary inputs that are configured to inputs of the synchrocheck functions in
the terminal. There are two alternative connection possibilities. Inputs named OK must
be supplied if the voltage circuit is healthy. Inputs named FF must be supplied if the
voltage circuit is faulty.
The SYRW-UB1OK and SYRW-UB1FF inputs are related to the busbar voltage. Con-
figure them to the binary inputs that indicate the status of the external fuse failure of the
busbar voltage. The SYRW-VTSU input is related to the line voltage.
The user can use the FFRW-VTSU signal from the built-in optional fuse-failure func-
tion as an alternative to the external fuse-failure signals.
In case of a fuse failure, the energizing check (dead line-check) is blocked via the inputs
(SYRW-UB1OK/FF or SYRW-VTSU).
166
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