Proface LT4300M - 5.7 Modular HMI + Control" - Manual (Page 27)

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LT-4201TM/4301TM Installation Guide
English
LT-4201TM/4301TM Installation Guide
Wiring Principles Wiring Principles
Wiring Rules and Recommendations
There are several rules that must be followed when wiring the LT system.
Wiring Guidelines
The following rules must be applied when wiring a LT system:
 I/O and communication wiring must be kept separate from the power wiring. Route these
2 types of wiring in separate cable ducting.
 Verify that the operating conditions and environment are within specification.
 Use proper wire sizes to meet voltage and current requirements.
 Use copper conductors.
 Use twisted-pair, shielded cables for analog, and/or fast I/O.
 Use twisted-pair, shielded cables for networks, and fieldbus.
 For the power connector, refer to DC power supply wiring diagram.
 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.
 If you use a temperature sensor with thermocouple inputs, make sure you use the
compensation cable.
 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
 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.
 Always use a properly rated voltage sensing device to confirm the power is off where
and when indicated.
 Replace and secure all covers, accessories, hardware, cables, and wires and confirm
that a proper ground connection exists before applying power to the unit.
 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.