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Model: PRM3
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The eGauge Power Relay Module is a versatile device intended to control up to three 240V AC/15 A resistive loads or motors up to 15 FLA (80 LRA). The relays can be opened and closed individually or synchronously, enabling the switching of up to three single-phase loads, one split-phase and one single-phase load, or one three-phase load.
Intended applications include remote control of air conditioners, heaters, refrigerators, office-automation, and similar equipment.
Prerequisites
- The PRM3 is designed for installation inside an enclosure with a DIN rail (35 mm top-hat), both supplied by the installer.
- Refer to the PRM3 Manual for additional materials required for installation.
- For control: requires eGauge Core or Pro, or a third party controller that supports Modbus RTU or SCPI.
Important Installation Notes
Polyphase equipment control danger warning
- When controlling single-phase or three-phase loads that have more than one current-carrying conductors (e.g., hot lines, not neutral or ground), be sure to control the relay inputs for the polyphase load simultaneously using mask controls, or there is risk of having the load operate without all phases which may cause damage to the equipment.
- Read PRM3 Owners manual for safety and full control information
- By default, the PRM3 is configured with a 10-second minimum open/close duration to minimize unintentional wear on the relays or rapid load switching. For example, by default when a relay input is opened, it will remain in the open state for at least 10 seconds before a command to close it will be acknowledged. This minimum delay may be reconfigured between 0 seconds and 4 minutes and 15 seconds using Modbus or SCPI commands.
Additional Resources
Related Articles
Example Wiring Diagrams
3-phase load wiring
- Neutral may or may not be used depending on the load.
- Be sure to control all 3 relay inputs simultaneously when turning on or off the three-phase load.
Single-phase load wiring
- Neutral may or may not be used depending on the load.
- Be sure to control both relay inputs simultaneously when turning on or off a single-phase load.
Split-phase load wiring
- Neutral may or may not be used depending on the load.
Typical RS-485 wiring
