Pro-face LT series, Hardware Manual

Page: 33 / 143

LT-4201TM/4301TM Hardware Manual
33
Wiring Rules and Recommendations
Introduction
There are several rules that must be followed when wiring the LT.
Wiring Guidelines
The following rules must be applied when wiring a LT:
z
Input/Output and communication wiring must be kept separate from the power
wiring. Route these 2 types of wiring in separate cable ducting.
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Verify that the operating conditions and environment are within specification.
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Use proper wire sizes to meet voltage and current requirements.
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Use copper conductors.
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Use twisted-pair, shielded cables for analog, and/or fast Input/Output.
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Use twisted-pair, shielded cables for networks, and fieldbus.
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For the power connector, refer to DC power supply wiring diagram
(see page 77)
.
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When terminals A2 and B2 (signal name: Q1, Q0) are wired to external I/O, use
the same power source for external I/O and the LT. Refer to Power Supply
Connections
(see page 81)
.
z
If you use a temperature sensor with thermocouple inputs, make sure you use the
compensation cable.
z
Prevent temperature changes to the thermocouple connection terminal. Correct
temperature measurement may not be possible if the thermocouple cold junction
(LT's thermocouple compensation wiring to the connection terminal) experiences
temperature changes.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION OR ARC FLASH
z
Disconnect 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.
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Always use a properly rated voltage sensing device to confirm the power is off
where and when indicated.
z
Replace and secure all covers, accessories, hardware, cables, and wires and
confirm that a proper ground connection exists before applying power to the
unit.
z
Use only the specified voltage when operating this equipment and any
associated products.
Failure to follow these instructions will result in death or serious injury.