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12. Fault Messages and Troubleshoot
Self-diagnosis feature
M10x has built in self-diagnosis program to
actively health check the internal hardware
circuits and software programs. The ‘test’
function through MD21 panel can also activate
the health checking pro-gram on request.
• Watchdog
A hardware watchdog is designed to supervise
the health checking program. In case any
hardware or software failure is detected by the
program, a reset is triggered from the watchdog
to restart the program. In the meantime, a watch-
dog alarm message is generated.
A watchdog alarm is a warning of one time health
check failure. The cause of the failure may be tem-
porary due to external disturbance/EMC environ-
ment and may not necessarily be severe. However
once a watchdog alarm message occurs,
it is necessary to be closely monitored. If the
watchdog alarm is trigger frequently, a follow-
up service and maintenance shall be scheduled
shortly..
In case of severe hardware or firmware failure, the
relay will no longer be resettable and required to
be replaced immediately.
The watchdog can be configured to one of the
digital output relays and monitored through
hardwiring.
• Test
Selecting TEST option under the main menu of
MD21 panel activates a comprehensive health
checking of M10x and MD21 including hardware
circuits, firmware programs and operation
functions.
Fault messages and trouble shoots
Condition Description Possible Cause Suggested Action
Thermal Capacity Alarm Motor is about to be stopped.
the motor thermal level reaches
thermal capacity level alarm level
The motor is under thermal
overload condition. Unacceptable
heating-up of motor winding.
Check the process conditions:> If it
is extreme starting conditions, high
overload or intermittent operation;
Check the motor condition:> Cooling
problem, ambient temperature too
high; mechanical problem;
Check the thermal model relevant
parameters: the Ie setting, T6 time
and ambient temperature setting,
the thermal level setting etc.
Overload Alarm Motor is about to be stopped.
The motor is in overload condition,
i.e. measured current ILmax > 1.14
x TFLC (thermal full load current
multiplier reduced by motor
ambient temperature)
The motor is in overload condition Check the process conditions;
Check motor load;
Check parameter settings.
Phase Failure Alarm Motor is about to be stopped.
The maximum imblance current
of any phase reaches the phase
failure alarm level.
Phase failure in motor phase
currents generally occurs
because of pitted contacts in
the contactor or SCPD,
imbalance in the mains supply,
loose connections, blown fuse,
and faults within the motor.
Check for blown fuse
Check for pitted contacts in
contactor or SCPD
Check for loose connection on
power supply
Check the motor connection
1 2 . FAU LT M E SS AG E S A N D TR O U B L ESH O OT 91
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