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18
18.1
Overload supervision (OVLD)
Overload supervision (OVLD)
Prepare the terminal for verification of settings as outlined in
this chapter.
Measuring the operate and time limit of set values
Procedure
1.
Check that the input logical signals OVLD-BLOCK is logical zero and
note on the local HMI that the OVLD-TRIP logical signal is equal to
the logical 0.
Logical signals for overload supervision protection are available under
menu tree:
ServiceReport/Functions/OverLoad/FuncOutputs
2.
Quickly set the measured current (fault current) in all three phases
to about 110% of the setting operating current, and switch off the
current with the switch.
Observe the maximum permitted overloading of the current circuits in the
terminal.
3.
Switch on the fault current and measure the operating time of the
OVLD protection.
Use the OVLD-TRIP signal from the configured binary output to stop the
timer.
4.
Compare the measured time with the set value t.
5.
Activate the OVLD-BLOCK binary input.
6.
Switch on the fault current (110% of setting) and wait longer than the
set value t.
No OVLD-TRIP signal should appear.
7.
Switch off the fault current.
8.
Reset the OVLD-BLOCK binary input.
9.
Quickly set the measured current (fault current) in all three phases
to about 90% of the measured operating current, and switch off the
current with the switch.
10. Switch on the fault current and wait longer than the set value t.
No OVLD--TRIP signal should appear.
11. Switch off the fault current.
Chapter 13
Verifying settings by secondary
section 2 "Preparing for test"
injection
in
135
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