System Wiring - Pentair POINT FOUR RIU3 Guía De Instalación Y Del Usuario

1. Ch1 input connector
i. A 2 pin connector for the first channel for a probe input. Required only for certain probe types, such as a
Dissolved Oxygen / Temperature probe.
2. Ch2 input connector
i. A 2 pin connector for the second channel for a probe input. Required only for probes with multiple channels,
such as a Dissolved Xxygen / Temperature probe.
3. Isolated DC output for auxiliary probe power
i. A 2 pin connector used to provide 24 VDC isolated auxiliary probe power. This can also be factory-configured
for 10 VDC as necessary. See page 6 for wiring information.
4. Auxiliary RS485 input connector
i. A 2 pin connector for RS485 probe inputs.
5. Power & RS485 inputs
i. 5 pin connectors. Pins 1 and 2 are used to connect DC power to the RIU3. Pins 3 and 4 are used to connect
the Modbus RS485 signal to the RIU3. Pin 5 is used to connect the shield of the cable to the RIU3 ground.
See page 6 for wiring information.
6. Data Tx & Rx LEDs
i. These LEDs indicate Modbus RS485 communications. The Rx LED will blink when a Modbus message is
received by the RIU3 and the Tx LED will blink when a Modbus message is transmitted by the RIU3.
7. Relay output connectors
i. 3 pin connectors used to connect the relay output to an external device. Normally open or normally closed
configurations can be used. See page 6 for wiring information.
8. SPDT relays
i. Single pole, double throw relays rated for up to 24 VDC , 10 A. The relay status is controlled by RIU3 control
blocks, which can be configured through the Control menu using the 4-button foil switch. See page 17 for
control block configuration information.
POINT FOUR™ RIU3™ Remote Monitor/Controller Installation and User's

SYSTEM WIRING

Guide
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