Section 8 - Troubleshooting
WARNING
Ensure that you have fully read “Section 3 - Safety” before troubleshooting
any issues with the controller.
8.1 Individual Card Diagnostics
The control system has several features which provide a diagnosis of faults in
the control system, the tool heaters and thermocouple sensors.
If a zone temperature is seen to deviate from the actual setting beyond
the alarm limits, then the display will change to white text in red box and
generate a remote alarm. See “Table 8-1 Alarm Conditions”.
Table 8-1 Alarm Conditions
Error
Message
Cause Action
ERR! Little or no temperature rise has been
detected in that zone. When power is
applied, there should be a corresponding
heat rise at the thermocouple. If the
thermocouple has been pinched in the tool
or the cable, the full heat rise that occurs
at the tip is not detected. If left uncorrected
then there is a danger that the zone could
overheat and damage the tip. The circuit
will maintain the output at whatever level it
reached when the monitor circuit detected
the fault.
Check thermocouple wiring, as it may
be reversed. Heater wiring may be
faulty or element may be open circuit.
FUSE The output fuse for that zone has failed.
Please note: A fuse can only fail due to a
fault external to the controller. Identify and
rectify the fault before replacing the fuse.
Note: The fuse detection circuit requires
a continuous low level current through a
high impedance bleed resistor to maintain
the alarm condition. As a result, the load
circuit is still connected to the mains voltage
supply, and it is not safe to attempt to repair
or replace the fuse without rst isolating the
circuit. If the fuse in question is mounted
on a control card then it is safe to unplug
the board in order to isolate the circuit and
replace the fuse on the card.
Replace the fuse with one of the
same rating and type, i.e. High
Rupture Current load fuse. The fuse
is located on the control card.
GND The system has detected an earth fault. Check the heater wiring for a low
impedance path to earth.
8-1
© 2020 Mold-Masters (2007) Limited. All Rights Reserved.
TROUBLESHOOTING
MT Controller User Manual
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