LN Application Specific, Remote I/O, and Free Programmable Controllers Installation Instructions
4
Wiring
Follow these wiring recommendations:
• Remove the front plate from the back plate to facilitate in the wiring process. Use a small flat screwdriver to
tighten the terminal connector screws once you have inserted the wires.
• Keep power cables apart from other types of wiring to avoid ambient noise transmission to other wires (for
example, for power, 3-wire voltage, and current inputs and outputs).
• Use wires or flat cables ranging from 22 to 12 AWG (0.645 to 2.052 mm diameter) per pole. Power cables must
remain between 18 to 14 AWG (1.024 to 1.628 mm) diameter.
• Keep all wires away from high-speed data transmission cables (for example, Ethernet cable).
• Keep input and output wires in conduits, trays, or close to the building frame whenever possible.
Power Wiring
For more information and requirements for powering a device that uses a LONWORKS network for communications,
refer to the L
ONWORKS LN-Series Network Communication and Interface Guide Technical Bulletin (LIT-12011253).
We recommend wiring only one device per 24 VAC transformer. When only one transformer is available, determine
the maximum number of devices that can be supplied using the following method for calculating the required power
transformer capacity:
1. Add up the maximum power consumption of all controllers and multiply this sum by 1.3.
2. If the resulting number is higher than 100 VA, consider using multiple transformers.
Use an external fuse on the 24 VAC/DC side (secondary side) of the transformer to protect all units against power
link spikes (Figure 3).
Maintain consistent polarity when you connect the controllers (or modules) and devices to the transformer.
Risk of Electric Shock.
Disconnect the power supply before making electrical connections to avoid electric shock.
Risque de décharge électrique.
Débrancher l'alimentation avant de réaliser tout raccordement électrique afin d'éviter tout risque de décharge
électrique.
IMPORTANT: All wiring must comply with electrical diagrams as well as national and local electrical codes.
IMPORTANT: Voltage: 24 VAC/DC; +
15%, Class 2. This is a Class 2 Product. Use a Class 2 transformer only
(rated at 100 VA or less at 24 VAC) to power the device.
IMPORTANT: Failure to maintain consistent polarity throughout the entire network will result in a short circuit
and damage to the controller.
IMPORTANT: The COM terminals of the controller are internally wired to the 24 V COM terminal of the power
supply. Connecting a peripheral or another controller to the same transformer without maintaining polarity
between these devices will cause a short circuit.
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