Siemens SIPROTEC 7SJ62 Handbuch Seite 36

36
− The break contact element of the life-contact and the make contact of trip relay BO1
are connected in parallel;
− A user-defined message is created in the configuration matrix of the device (see
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SIPROTEC 4 System Description, at Section 5.7) and configured to the binary
input (e.g. BI1) as "L (active without voltage)" and configured to a binary output
(BO 4 for 7SJ62, BO 15 for 7SJ63, BO5 for 7SA64);
During normal, faultless operation BO1 and the life-contact are opened, BI1 is dead
and, correspondingly, BO4 or BO15 or BO5 are closed.
In the event of a trip command issued by the protection device, an internal device fault,
faults in the trip circuit, or failure of the control voltage the undervoltage trip element
of the circuit breaker initiates tripping of the circuit breaker.
• Other tripping circuits and / or indications in case of device failure must be tailored
to the particular intended application.
• The following options are available in case of device failure to avoid automatic shut-
down of the drive for operational reasons:
1 Redundant protection device
2 Redundant protection function or backup protection functions:
− Backup short-circuit protection
via corresponding design of power system protection, possibly including breaker-
failure protection.
− Redundant t -time supervision
BRT
through additional time-overcurrent protection, additional speed monitoring or
start inhibit in case of device failure in connection with blocked rotor protection
within the protection system of the machine.
− Redundant overload protection
through monitoring of the stator winding temperature.
• The trip circuit for the circuit breaker must be fused by a maximum of 6 A, tripping
characteristic C (EN 60898).
• Hardware modifications of the device as described at Subsection 3.1.3 in the device
manual are not necessary, provided the ordered model variant satisfies exactly the
system requirements (nominal current, power supply rating, communication). With
regard to the increased safety requirements of the application area hardware
modifications should generally be omitted.
• An exchange of the fuse in the power supply unit of the device should be treated as
a repair action and as such should only be performed in the factory of the
manufacturer.
• Replacement of the backup battery in the device is accomplished according to Sec-
tion 8.3 of the SIPROTEC
up battery is sufficiently charged and properly poled the following tests should be
carried out after battery exchange:
– Set the internal system clock of the device (see Subsection 4.3.7 of the
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SIPROTEC (4 System Description)
– Switch off the power supply of the protective relay
– Deactivate any external time synchronization source
– Reactivate the power supply of the protective relay after some 3 minutes
– Verify the time displayed at the device; it must still be correct despite the short
power supply interruption
– Reactivate the external time synchronization source.
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4 System Description. In order to ensure that the back-
7SJ62/63/64 Additional Information
C53000-B1174-C170-1