ABB Network Partner AB
Synchronism and energizing
check for single circuit breaker
with voltage selection
Version 1.0-00
1MRK 580 152-XEN
Page 5 - 14
For the control terminal intended for one bay, the line voltage (SYN1-U-
line 1) is connected as a three-phase voltage to the analogue inputs UL1,
UL2, UL3 (ULx). For the version intended for three bays, the line volt-
ages are connected as three single-phase inputs, UL1 for Bay 1, UL2 for
Bay 2, and UL3 for Bay 3.
Fuse failure and Voltage OK signals
The external fuse-failure signals or signals from a tripped fuse switch/
MCB are connected to binary inputs configured to inputs of the synchro-
check functions in the control terminal. There are two alternative connec-
tion 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 SYNX-UB1OK and SYNX-UB1FF inputs are related to the busbar
voltage. Configure them to the binary inputs that indicate the status of the
external fuse failure of the busbar voltage. The SYNX-VTSU input is
related to the line voltage from each line.
For the control terminal that is intended for one bay, you can use the
FUSE-VTSU signal from the built-in optional selectable fuse-failure
function as an alternative to the external fuse-failure signals.
In case of a fuse failure (FUSE-VTSU), the energizing check (dead line-
check) is blocked via the input (SYN1-VTSU). The synchronizing check
is also blocked due to a lack of voltage compared to the set voltage condi-
tions.
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