Operation Principle - ABB RET650 Technical Manual

Section 17
Basic IED functions
17.4.6
576

Operation principle

Put the IED into test mode to test functions in the IED. Set the IED in test mode by
• configuration, activating the input SIGNAL on the function block TESTMODE.
• setting TestMode to On in the local HMI, under Main menu/Tests/IED test
mode/1:TESTMODE.
While the IED is in test mode, the output ACTIVE of the function block TESTMODE
is activated. The outputs of the function block TESTMODE shows the cause of the
"Test mode: being in On" state. If the input from the configuration (OUTPUT signal
is activated) or setting from local HMI (SETTING signal is activated).
While the IED is in test mode, the yellow START LED will flash and all functions are
blocked. Any function can be unblocked individually regarding functionality and
event signalling.
Forcing of binary output signals is only possible when the IED is in test mode.
Most of the functions in the IED can individually be blocked by means of settings from
the local HMI. To enable these blockings the IED must be set in test mode (output
ACTIVE is activated). When leaving the test mode, and returning to normal operation,
these blockings are disabled and everything is set back to normal operation. All testing
will be done with actually set and configured parameter values within the IED. No
settings will be changed, thus no mistakes are possible.
The blocked functions will still be blocked next time entering the test mode, if the
blockings were not reset. The released function will return to blocked state if test mode
is set to off.
The blocking of a function concerns all output signals from the actual function, so no
outputs will be activated.
When a binary input is used to set the IED in test mode and a
parameter, that requires restart of the application, is changed, the IED
will re-enter test mode and all functions will be blocked, also
functions that were unblocked before the change. During the re-
entering to test mode, all functions will be temporarily unblocked for
a short time, which might lead to unwanted operations. This is only
valid if the IED is set in TEST mode by a binary input, not by local
HMI.
The TESTMODE function block might be used to automatically block functions
when a test handle is inserted in a test switch. A contact in the test switch (RTXP24
contact 29-30) can supply a binary input which in turn is configured to the
TESTMODE function block.
Each of the functions includes the blocking from the TESTMODE function block.
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