440F-M2029CYNN A-B Interface Module
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Power Distribution There are some points about power distribution that you should know: • The master control relay must be able to inhibit all machine motion by removing power to the machine I/O devices when the relay is de-energized. It is recommended that the controller remain powered even when the master control relay is de-energized. • If you are using a DC power supply, interrupt the load side rather than the AC line power. This avoids the additional delay of power supply turn-off. The DC power supply should be powered directly from the fused secondary of the transformer. Power to the DC input and output circuits should be connected through a set of master control relay contacts
Periodic Tests of Master Control Relay Circuit Any part can fail, including the switches in a master control relay circuit. The failure of one of these switches would most likely cause an open circuit, which is a safe power-off failure. However, if one of these switches shorts out, it no longer provides any safety protection. These switches should be tested periodically to assure they will stop machine motion when needed.Isolation Transformers Consider using an isolation transformer in the AC line to the controller. This type of transformer provides isolation from your power distribution system to reduce the electrical noise that enters the controller and is often used as a step-down transformer to reduce line voltage. Any transformer that is used with the controller must have a sufficient power rating for its load. The power rating is expressed in voltamperes (VA).
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