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Model: PRM3
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Overview
Polyphase equipment control danger warning
- When controlling single-phase or three-phase loads that have more than one currently-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
Information
- For control: requires eGauge Core or Pro, or a third party controller that supports Modbus RTU or SCPI.
- 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.
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.
Specifications
- Contacts rated for up to 240 V AC/15 A resistive (50-60 Hz)
- Relay state persists across power-outages
- Normally open contacts
- Can be switched independently or in arbitrary groups
- Configurable minimum open/close duration to minimize relay wear
- DIN-rail enclosure
- USB interface
- Easy to use SCPI command set (text commands)
- USB powered
- RS-485 Interface
- Single 5 V DC/500 mA power supply
- Modbus protocol
- SunSpec compatible
- Low average power consumption
- <500 mW typical with all relays on
- <100 mW with relays off
- Wide operating range: -30. . . 70 ◦ C, up to 4000 m altitude
- Certifications
- UL Listed: IEC/UL 61010-1 Ed. 3.0 B:2010, File Number E524350
- FCC
- FCC’s Title 47 CFR Part 15 Subpart B Class B
- ICES-003 Information Technology Equipment Class
- 2-year Limited Warranty
Included Hardware
- 1x eGauge PRM3 power relay module
- 6' USB Type-A to USB Type-B cable for meter or SCPI control and power
- 3x 2-pin terminal blocks for relays
- 1x 4-pin terminal block for RS-485 connection for Modbus and power
Installation & Assembly
The Power Relay Module is usually installed near the load (or loads) that it controls. It is permanently connected equipment.
The Power Relay Module is a listed device and must be installed inside a suitable enclosure. The enclosure must be rated according to the environment it is used in. For example, outdoor installations require an outdoor-rated enclosure such as
IPX4/NEMA4.
The eGauge PRM3 may be controlled through several different options: