Smart Series ® RoHS/WEEE Compliant: Microprocessor-Based Temperature Control Modules with Color Touch Screen Display
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Individual Card Diagnostics The control system has several features which provide a diagnosis of faults in the control system, the tool heaters and thermo- couple 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. The following is a list of alarm conditions that may be detected and which will also activate the output contacts.
ERROR MESSAGE
CAUSE
ACTION
Little or no temperature rise has been detected in that zone. When the console starts to apply power it expects to see an equivalent heat rise at the thermocouple. If the thermocouple has been trapped and pinched elsewhere in the tool or cable then it cannot sense the full heat rise that occurs at the tip. If left uncorrected, there is a danger that the zone could overheat and damage the tip. Instead the circuit maintains the output at whatever level it reached when the monitor circuit detected the fault. 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 main’s voltage supply and it is not safe to attempt to repair or replace the fuse without first 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.
Check thermocouple wiring; it may be reversed. Heater wiring may be faulty or element may be open circuit.
ERR!
Replace the fuse with one of the same rating and type; i.e. High Rupture Current load fuse. The blown fuse is located on the control card.
FUSE
Check your heater wiring for a low impedance path to the ground. There is a phase detection circuit on each TMS15-Series card and a common phase detection circuit on all other controller types. Although a fault in such circuits may cause the LINE error message, such fault is very rarely seen. The most common error is either the absence of one phase or, if a plug has been re-wired incorrectly, a swapped phase and neutral. If a LINE error message oc- curs then switch off and isolate the controller then check supply wiring for presence of all three phases. If the REV alarm persists, switch off the controller and investigate the offending zone. For immediate recovery, change to open loop control. Make a note of the above action so that when the controller is free you can check to see whether the input fuse on the control card has ruptured. If the fuse is good then you may need to check the wiring for faults or even replace the thermocouple.
GND
The system has detected an ground fault.
No mains supply synchronization pulses being received. The 3-phase supply is used in a cross-over detection circuit to gener- ate timing pulses for accurate phase control and firing the triac. If the phase detection fails on one or two phases then there is no pulse to use to measure phase angle and the LINE error mes- sage is generated. Meanwhile, all circuits on the healthy phases will continue to work normally.
LINE
The card has detected an abnormal input at the T/C termination that indicates a shorted or reversed thermocouple.
REV
An open circuit thermocouple has been detected and no auto- response has been selected in the T/C Open Error column of the Setup page.
T/C
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