ABB REL 551 2.3 Series Installation And Comissioning Manual page 123




Thermal overload protection (THOL)
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Prepare the terminal for verification of settings as outlined in section "Preparing for
test" in this chapter.
Check that the input logical signal THOL-BLOCK is logical zero and note on the local
HMI that the logical signal THOL-TRIP, THOL-START and THOL-ALARM are
equal to the logical 0. Logical signals for thermal overload protection are available un-
der menu tree:
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Measure the signal THOL-ALARM until it appears on the corre-
sponding binary output or on the local HMI unit.
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Use the THOL-TRIP signal from the configured binary output to
stop the timer.
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Compare with the setting of TTrip.
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