
3.SAFETY FUNCTIONS B-63494EN/02
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3.8 MCC OFF TEST
A MCC off Test must be carried out in intervals of 24 hours, so that
the safety functions would not be damaged by a possible cause of
failure. A message telling that the MCC off Test must be carried out is
displayed at power-on or when 24 hours have elapsed after the
previous MCC off Test. The protective door can be opened only after
the MCC off Test is carried out accordingly.
IMPORTANT
Carry out the MCC off Test with the protective door
closed. Because the test shuts off the MCC, prepare
the system for mechanical MCC shut-off before
starting the MCC off Test.
Notes on MCC off Test and the timing chart for MCC off Test are
provided below.
<1> When conducting a MCC off Test, ensure that the feed axes and
spindle are stopped.
<2> When a MCC off Test ends, the MCC off Test execution request
signal is turned off. After the MCC off Test execution request
signal is turned off, turn off the test mode signal.
<3> If a vertical axis is used, measures such as a brake circuit for
protecting against falling are required. On the ladder, ensure that
500 ms or more is provided between the actuation of the brake
and the start of the test start signal OPT.
<4> Do not connect a peripheral device and noise filter between the
MCC and PSM. If such a device is connected, the test may not be
terminated normally.
<5> For the servo axis connected to the PSM under test, ensure that
the servo-off signal (SVF8-1) is enabled after actuation of the
brake. If the servo-off signal is not input, an alarm may be issued
from the PSM during test.
<6> When a power outage backup module is connected, the power
outage backup module ready signal (contact output signal RDY)
is turned off during MCC off Test. So, make sure that no
problem arises on the ladder. For example, a countermeasure is
to mask the ready signal with the test mode signal.