8.2 Other Possible Fault Conditions
8.2.1 Rapid Temperature Fluctuations
The most likely cause of temperature uctuations is extraneous voltages
being picked up by the thermocouple cable, i.e. common mode. This may
be due to poor earthing of the tool, a faulty shielded thermocouple wire or a
faulty heater. We recommend that all earth connections be tested.
8.2.2 Ground Fault Detection
Ground fault detection detects any fault caused by earth leakage current.
Earth faults can be caused if a tool has been idle for some time and damp
has gotten into one heater. If the heater can be identied, the faulty zone can
be repaired by using the adjacent heaters to heat it up and dry it out.
8.3 Module Removal
WARNING
The shrouded terminals on the Euroback board are live unless the power
supply is switched to OFF.
To remove a control module from its slot, unscrew the four corner screws
rst. There is no need to switch o the main supply. However, if operational
requirements allow, the cabinet may be isolated.
8-3
© 2020 Mold-Masters (2007) Limited. All Rights Reserved.
TROUBLESHOOTING
MT Controller User Manual
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