7.4 Self Diagnostic Tests
The controller can perform two types of diagnostic tests.
1. Power Test
Power test can only be used on current measuring cards, and it is designed
as a maintenance aid only.
It checks that:
• the heater zones are functioning correctly
• that the feedback from current sense coils are consistent with tool’s
history file
IMPORTANT
The Power Test
does not
check for zone wiring errors or anything similar.
2. Full System Test
The Diagnostic test checks that every zone is functioning correctly. It can be
used:
• as an acceptance check
• to see that a new tool is wired up correctly
• as a maintenance aid, to check that a working tool is functioning
correctly
Please see below for the test sequence:
1. It cools the whole
tool.
During this time, all zones are checked to see that none
experience a significant temperature rise.
2.
It heats the first
zone and checks to
see that:
a) the first zone rises sufficiently to qualify as a “Good
Rise”
• if not it increases the applied power and looks for
the “Good Rise”.
• it continues to raise the power and look for a
“Good Rise” until the configured Heat Time
expires.
• if it does not see a “Good Rise” within that time
then the zone has failed.
b) the temperature of the zone under test does not
reduce further, which would indicate a reversed
thermocouple on that zone.
c) no other zone rises enough to become a “Bad Rise,”
which would indicate excessive thermal conduction
between adjacent zones.
d) no other zone rises by as much as the “Good Rise”
which would indicate cross-wiring between the zone
under test and another thermocouple.
3. Once the test is
done, the routine
tests the other
zones until all have
been completed.
7-5
MAINTENANCE
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M1 Plus Controller User Manual
