Earth ground and power
Earth grounding and power provides protection from electrostatic discharge or other forms of EMI.
Prerequisites: A nearby earth grounding point is available.
WARNING: Before making power terminations, de-energize the 24V power source. Do not restore power until completing all other mounting
and wiring. Refer to “Power up and initial checkout” for more details.
Figure 7. Earth ground and power options
Depending on your power source:
| 1 | Ground |
| 2 | Power |
|
2.1 (AC): Dedicated 24V transformer required, with neither side of the transformer secondary tied to ground or 2.2 (DC): Polarity is unimportant (uses onboard diode bridge), with neither leg tied to ground or 2.3 (Wall-mount AC adapter, WPM-8000) instead of wiring 24V to two-position connector |
Perform the following steps:
- Install the included earth ground wire to the controller’s earth ground spade lug and terminate the other end to a nearby earth ground.
- Unplug the controller’s two-position power connector plug and terminate the 24V supply source (AC or DC) to the connector. Leave the connector unplugged for now.