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Chapter 13
Trouble Shooting
Rev. 1.00.05
Subject to technical changes
13.5 Current tolerance error
13.6 Thyristor alarm Thy
CTA
A current tolerance error, indicates, that the measured heat-
ing current is outside the tolerance band for the zone com-
pared to the reference value (current setpoint value) set.
How it works
The hot runner controller measures the currents through the
heaters continuously and compares these to the reference
values, the current setpoint values. This can be specified
manually or automatically by call of the function current
transfer.
A current tolerance error indicates either a partly breakdown
of the heater or that the current setpoint values were not yet
set after a change of the connection controller and hot run-
ner.
What good is it
The current tolerance error provides the user with a specific
indication of the error in the hot runner or of a wrong setting,
and provides the ability to pinpoint errors quickly and correct
it.
Remedy
Reason
Trouble Shooting
Ground
Check Heating
Sensor at heating out-
put
Check wiring system
Tool changing without
current transfer
Execute current transfer
Thy
A thyristor alarm indicates a defective component in the hot
runner controller.
How it works
The hot runner controller checks the measurement of the
heating currents, whether a power controller (thyristor) is
uncontrolled heated in the hot runner controller due to a de-
fect.
Since this is a critical error case which can damage the
heating circuit due to overheating, the heating circuit is im-
mediately switched off (relay on HTC-Card OFF).
What good is it
The thyristor alarm primarily protects the heater against
temperature excess, which causes an electric damage in
the heater and replacement of the heater.
It provides the user with a specific indication of the error in
the hot runner and provides the ability to correct it quickly.
Remedy
Reason
Trouble Shooting
Defective component
Replacement defective component (see chapter
