440L-AM0751650 A-B  I / O module

WARNING: EXPLOSION HAZARD • Substitution of components may impair suitability for Class I Division 2. • Do not replace components or disconnect equipment unless power has been switched off. • Do not connect or disconnect components unless power has been switched off. • This product must be installed in an enclosure. All cables connected to the product must remain in the enclosure or be protected by conduit or other means. • All wiring must comply with N.E.C. article 501-4(b). • The interior of the enclosure must be accessible only by the use of a tool. • For applicable equipment (for example, relay modules), exposure to some chemicals may degrade the sealing properties of the materials used in these devices: – Relays, epoxy It is recommended that you periodically inspect these devices for any degradation of properties and replace the module if degradation is found.

Circuits installed on the machine for safety reasons, like overtravel limit switches, stop push buttons, and interlocks, should always be hard-wired directly to the master control relay. These devices must be wired in series so that when any one device opens, the master control relay is de-energized, which removes power to the machine. Never alter these circuits to defeat their function. Serious injury or machine damage could result. 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.

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