This section describes the wiring guidelines and associated best practices to be respected when using the M251 Logic Controller system.
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HAZARD OF ELECTRIC SHOCK, EXPLOSION OR ARC FLASH |
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oDisconnect all power from all equipment including connected devices prior to removing any covers or doors, or installing or removing any accessories, hardware, cables, or wires except under the specific conditions specified in the appropriate hardware guide for this equipment. oAlways use a properly rated voltage sensing device to confirm the power is off where and when indicated. oReplace and secure all covers, accessories, hardware, cables, and wires and confirm that a proper ground connection exists before applying power to the unit. oUse only the specified voltage when operating this equipment and any associated products. |
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Failure to follow these instructions will result in death or serious injury. |
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LOSS OF CONTROL |
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oThe designer of any control scheme must consider the potential failure modes of control paths and, for certain critical control functions, provide a means to achieve a safe state during and after a path failure. Examples of critical control functions are emergency stop and overtravel stop, power outage and restart. oSeparate or redundant control paths must be provided for critical control functions. oSystem control paths may include communication links. Consideration must be given to the implications of unanticipated transmission delays or failures of the link. oObserve all accident prevention regulations and local safety guidelines.1 oEach implementation of this equipment must be individually and thoroughly tested for proper operation before being placed into service. |
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Failure to follow these instructions can result in death, serious injury, or equipment damage. |
1 For additional information, refer to NEMA ICS 1.1 (latest edition), "Safety Guidelines for the Application, Installation, and Maintenance of Solid State Control" and to NEMA ICS 7.1 (latest edition), "Safety Standards for Construction and Guide for Selection, Installation and Operation of Adjustable-Speed Drive Systems" or their equivalent governing your particular location.
This rules must be applied when wiring a M251 Logic Controller system:
oCommunication wiring must be kept separate from the power wiring. Route these 2 types of wiring in separate cable ducting.
oVerify that the operating conditions and environment are within the specification values.
oUse proper wire sizes to meet voltage and current requirements.
oUse copper conductors (required).
oUse twisted pair, shielded cables for networks, and fieldbus.
Use shielded, properly grounded cables for all communication connections. If you do not use shielded cable for these connections, electromagnetic interference can cause signal degradation. Degraded signals can cause the controller or attached modules and equipment to perform in an unintended manner.
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UNINTENDED EQUIPMENT OPERATION |
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oUse shielded cables for all communication signals. oGround cable shields for all communication signals at a single point1. oRoute communication separately from power cables. |
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Failure to follow these instructions can result in death, serious injury, or equipment damage. |
1Multipoint grounding is permissible if connections are made to an equipotential ground plane dimensioned to help avoid cable shield damage in the event of power system short-circuit currents.
For more details, refer to Grounding Shielded Cables.
NOTE: Surface temperatures may exceed 60 °C (140 °F).
To conform to IEC 61010 standards, route primary wiring (wires connected to power mains) separately and apart from secondary wiring (extra low voltage wiring coming from intervening power sources). If that is not possible, double insulation is required such as conduit or cable gains.
Rules for Removable Screw Terminal Block
The following tables show the cable types and wire sizes for a 5.08 pitch removable screw terminal block (power supply):
The use of copper conductors is required.
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LOOSE WIRING CAUSES ELECTRIC SHOCK |
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Tighten connections in conformance with the torque specifications. |
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Failure to follow these instructions will result in death or serious injury. |
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FIRE HAZARD |
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Use only the correct wire sizes for the maximum current capacity of the power supplies. |
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Failure to follow these instructions will result in death or serious injury. |
