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Manual, Control Module, PROFINET, DL10
Document #9620-20-C-DL10-04
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C-15
2.2.3 Arc Prevention Circuit Behavior during Uncoupling
The behavior of the Arc Prevention Circuit during uncoupling can be more clearly understood by
referring to
Figure 2.4 .
Immediately after the UNLATCH command is issued, the Arc Prevention Circuit will turn off US1
and US2 power. The power off time delay between the UNLATCH command and the switching off
of power (designated T
2
in the diagram) is less than 50 ms.
Some time after power is turned off and the Master and Tool begin to separate, electrical contact
between Master and Tool pin contacts will be lost. This occurs with a delay, designated T
3
in the
diagram, after the UNLATCH command is issued. The magnitude of time T
3
is a function of many
factors, including the weight of the EOAT, the friction between Master and Tool alignment pins,
etc. but is usually not shorter than 100 ms.
Figure 2.4—Power Off Timing
Profinet US1 and
US2 Power
Electrical Contact Between
Master and Tool
UNLATCH Output
ON
OFF
ON
OFF
ON
OFF
T
2
T2 = Power Switch OFF-delay
T3 = Tool Changer Electrical Contact.
T
3