Figure 5: Earth ground and power options
Depending on the power source used:
• 2.1 (AC): Dedicated 24 V transformer required, with neither side of the transformer secondary
tied to ground.
• 2.2 (DC): Polarity is not important (uses onboard diode bridge), with neither leg tied to ground.
• 2.3 (Wall-mount AC adapter, FX-SC8XPS-0) instead of wiring 24 V to 2-position connector. Do not
use the wall-mount AC adapter simultaneously with power wired 2-position connector.
Wiring earth ground and power
Important: Before making power terminations, de-energize the 24 V power source. Do not
restore power until completing all other mounting and wiring.
Important: A grounding point must be present nearby.
1. Install the included earth ground wire to the controller's earth ground spade lug, and
terminate the other end to a nearby earth ground.
2. Unplug the controller's 2-position power connector plug and terminate the 24 V supply source
(AC or DC) to the connector. Leave the connector unplugged.
Communications wiring
FX80 Supervisory Controller Installation Instructions6
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