ABB REF615 Applications Manual page 107

1MRS756378 D
REF615
Application Manual
input. A control command to the circuit breaker, either local or remote, also blocks
the autorreclose function via the CBXCBR-selected signal.
The circuit breaker availability for the autorreclosure sequence is expressed with the
binary input 4 (X110:6-7) by connecting the input signal to the CB_RDY input. In
case this signal is completely removed from the autorreclose function block with
SMT, the function assumes that the breaker is available all the time.
The autorreclose sequence in progress indication is connected to the alarm LED 11.
Three overvoltage and undervoltage protection stages (PHxPTOV and PHxPTUV)
offer protection against abnormal phase voltage conditions. The operation of voltage
functions is connected to alarm LED 3. A failure in the voltage measuring circuit is
detected by the fuse failure function and the activation is connected to undervoltage
protection functions to avoid faulty undervoltage tripping.
GUID-BCEB1C2E-BC64-4E79-8329-A5D9FCD7AB2F V1 EN
Figure 54: Overvoltage and undervoltage protection
Positive-sequence undervoltage (PSPTUV) and negative-sequence overvoltage
(NSPTOV) protection functions enable voltage-based unbalance protection. The
operation signals of voltage-sequence functions are connected to alarm LED 3, which
is a combined voltage protection alarm led.
Section 3
REF615 variants
101