The initial step is to confirm that the alarm is not triggered due to a high temperature. It is recommended to ensure the accuracy of the machine temperature reading and check for any calibration errors, such as a significant offset. The offset value can be viewed in the Solder Pot Module window, accessible via the Troubleshooting Tab, and it should not surpass +/- 5 degrees F. If it is, calibrate the temperature or investigate the cause of the high offset. If further assistance is required, do not hesitate to contact EVT Technical Support.
There are several circuits available depending on the machine type, age, and configuration. It is important to consult your electrical schematics when troubleshooting. Our main objective is to detect any High Temp. before activating the heaters by checking for an input to a channel of the Digital Input Board. This input is DC common, and the channel must be turned ON. To confirm, please refer to the DI/O screen on the machine and look for “Solder/Hot Knife High Temp. OK”. You can access this screen through the Modules Menu. Please see the example below for a visual representation of the hardware in a run condition.
If the input is in the OFF position, it will be necessary to conduct troubleshooting on the circuit. It will be necessary to refer to the schematics to determine where this signal is being lost. It is important to note that the DC common signal is routed through all safety devices, the number, and types of which are determined by the options selected. To provide a starting point for investigation, an example circuit has been included below, with the path of the signal highlighted in green.
A typical issue found is the presence of oxidized contacts within the TS-01 thermostat, which can prevent the DC common signal from passing through. In such instances, it is recommended that the thermostat (Part number 3-0606-462-01-1) be replaced. The thermostat can be found beneath the rear cover of the solder pot, as shown in the image below.
