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Power Wiring
Voltage 24 VAC; ±15%; Class 2
Maximum Consumption 2 A
This is a Class 2 Product. Use a Class 2 transformer only (rated at 100 VA or less at 24 VAC) to power the
controller(s).
When calculating a controller’s power consumption to size the 24 VAC transformer, you must also add the external loads the controller is going to supply,
including the power consumption of any connected subnet modules.
It is recommended to wire only one controller per 24 VAC transformer. Do not connect more than 5 controllers to a single transformer.
Use an external fuse on the 24 VAC side (secondary side) of the transformer to protect all controllers against power line spikes.
Maintain consistent polarity when connecting controllers and devices to the transformer. That is, the COM terminal of each controller and each peripheral
should be connected to the same terminal on the secondary side of the transformer.
The COM terminals of the controller are internally wired to the ground terminal of the power supply connector.
Connecting a peripheral or another controller to the same transformer without maintaining polarity between these
devices will cause a short circuit.
The following diagram shows the recommended wiring of the controller with and without a 3-wire peripheral. This configuration applies either to a daisy-
chain configuration or configuration with separate transformers.
1
24V
2
COM
24 VAC
AC Power
Source
(Mains)
Fuse: 2A
Max. Fast
Acting
Figure8: Power Wiring
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