Installation and Commissioning
8-64 7SA6 Manual
C53000-G1176-C133-1
permissive underreach (Sub-section 8.3.12.1 under “Permissive Underreach
Transfer”); however the received signal causes a direct trip.
For the remote transmission, the external command input is employed on the
receiving line end; it is therefore a prerequisite that: in address the setting '77
'LUHFW7ULS is set to (QDEOHG and that in address the setting '77'LUHFW
7ULS is set to 21. If the signal transmission path is the same and has already been
checked as part of the previous subsections, it need not be checked again here. A
function check is sufficient, whereby the externally derived command is executed. For
this purpose the external tripping event is simulated and the response of the circuit
breaker at the opposite line end is verified.
8.3.13 Testing User-Defined Functions
7SA6 has a vast capability for allowing functions to be defined by the user, especially
with the CFC logic. Any special function or logic added to the device must be checked.
Naturally, general test procedures cannot be given. Rather, the configuration of these
user-defined functions and the necessary associated conditions must be known and
verified. Of particular importance are possible interlocking conditions of the switch-
gear (circuit breakers, isolators, etc.). They must be considered and tested.
8.3.14 Trip and Close Test with the Circuit Breaker
The circuit breaker and tripping circuits can be conveniently tested by the device
7SA6.
The procedure is described in detail in Section 7.3.
If the check does not produce the expected results, the cause may be established from
the text in the display of the device or the PC. If necessary, the connections of the
circuit breaker auxiliary contacts must be checked:
It must be noted that the binary inputs used for the circuit breaker auxiliary contacts
must be assigned separately for the CB-test. It is accordingly not
sufficient that the
auxiliary contacts are assigned to the binary inputs with FNo to DQG
(depending on the options of the auxiliary contacts); in addition, the
corresponding FNos to or and/or(according to the functions the
auxiliary contacts provide) must be configured. In the CB-test only the latter ones are
analysed. See also Subsection 6.20.2. Furthermore, the ready state of the circuit
breaker for the CB-test must be indicated to the binary input with FNo .
8.3.15 Switching Check for the Configured Operating Devices
Switching
via Command
If the configured operating devices were not switched sufficiently in the hardware test
already described (Subsection 8.3.3), all configured switching devices must be
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