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moldmakingtechnology.com 21 interface (HMI) to set, monitor and troubleshoot temperature- related issues. There also are a number of hot runner control- lers available that are independent of the press. This may be an attractive option, as a separate controller can be upgraded more frequently while remaining more cost-effective, and can be moved from press to press. Today, more molders expect the moldmaker to test and document the hot runner manifold sys- tem's performance prior to mold shipment. A modern hot runner controller with capabilities to accurately and quickly diagnose root cause is a true efficiency gain for the molder or moldmaker who is attempting to diagnose TC, heater, cable or adaptor issues. For example, test results can give the moldmaker an opportunity to correct a manifold issue prior to delivery, preventing a wasted sample. Common issues like pinched wires and heat-sink problems can also be identified with the hot runner controller, and resolved quickly. Cables and adaptors connect the power source to the heater and the TC to the control system. Cables should be safe, with no cuts or pinched wires, and connection pins should not be bent or pushed back, and should be correctly seated in the plug. If adaptors are necessary, compatible wire CONTRIBUTOR Rich Oles is currently working with a Tier II injection molder in Zeeland, Michigan. FOR MORE INFORMATION: Rich Oles / 616-610-7050 / richoles@gmail.com LEARN MORE Heating System Basics Visit short.moldmakingtechnology.com/ heatsystem for more on the information presented here. In this example, use of a cable adaptor made from incompat- ible materials resulted in degraded material. Image courtesy of Rich Oles. materials should be used. Power sources also are an important consideration. All transformers must be wired and grounded correctly, and cables should be rated for the appropriate amp load. The types of power and TC plugs should also be considered. One common connector plug type, the PIC 12, includes power (or TC) pins that snap into place. This can be a source of prob- lems over time or with improper use, as these pin connectors can push out of the connector, yielding an open TC or heater circuit that can cause a lost or inconsistent connection, and poor system performance . Issues with heated melt delivery systems are often misun- derstood and misdiagnosed. The basic information provided here is designed to help resolve the majority of heat-related issues experienced during the molding process.