Values of the logical signals for STBPTOC (50STB) are available on the local HMI under
Main menu/Tests/Function status/Current/STBPTOC(50STB,I>)/STBPTOC:1.
The Signal Monitoring in PCM600 shows the same signals that are available on the local
HMI.
6.3.11.1 Measuring the operate limit of set values
1. Check that the input logical signals BLOCK and ENABLE and the output logical
signal TRIP are all logical zero.
2. Activate the input ENABLE on the STBPTOC (50STB) function block
3. For a short while inject a current (fault current) in one phase to about 110% of the set
operating current, and switch the current off.
Observe to not exceed the maximum permitted overloading of the current circuits in
the IED.
4. Switch the fault current on and measure the operating time of STBPTOC (50STB).
Use the TRIP signal from the configured binary output to stop the timer. The
operation should be instantaneously.
5. Activate the input BLOCK on the STBPTOC (50STB) function block.
6. Switch on the fault current (110% of the setting).
No TRIP signal should appear.
7. Switch off the fault current.
8. For a short while inject a current (fault current) in same phase to about 90% of the
set operating current, and switch the current off.
9. Switch the fault current on.
No TRIP signal should appear.
10. Switch off the fault current.
11. Reset the ENABLE binary input.
12. Switch the fault current on.
No TRIP signal should appear.
13. Disable the fault current.
6.3.11.2 Completing the test
Continue to test another function or end the testing by setting the parameter TestMode to
Disabled under Main menu/Tests/IED test mode/TESTMODE:1. If another function is
tested, then set the parameter Blocked to No under Main menu/Tests/Function test
modes/Current/STBPTOC(50STB,I>)/STBPTOC:1 for the function, or for each
individual function in a chain, to be tested next. Remember to set the parameter Blocked to
Yes, for each individual function that has been tested.
1MRK 505 293-UUS A Section 6
Testing functionality
69
Commissioning manual
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