Simarine SCQ25T Digital Shunt and Tank Module

1. Introduction

The SCQ25T digital shunt module is Simarine's most versatile module. It can be used to measure voltages, currents, liquid levels, and temperatures.

The SCQ25T features 4x 25 A integrated shunts, capable of measuring voltage up to 35 V DC and continuous current up to 25 A on each shunt.

The SCQ25T can measure temperature or liquid level such as water, fuel, or any other liquid. It comes with 4 integrated resistance inputs operating from 0 ohm - 65 kohm and 3 integrated voltage inputs, operating from 0 V - 32 V. You can connect any tank or temperature sensor operating within this range.

Additionally, the SCQ25T features a configurable alarm contact, which triggers on specific alarms. It can handle a maximum current of 1A at a maximum of 30V DC. The alarm is configurable via the PICO device menu or the PICO mobile app menu.

2. Safety

DISCLAIMER: Installation of Simarine electronics should be performed by electrical specialists with proper safety equipment. When working with batteries, wear protective clothing and eye protection.

CAUTION:

• Batteries contain acid, a corrosive, colorless liquid that will burn your eyes, skin, and clothing. Should the acid come into contact with eyes, skin, or clothing, wash the affected area with fresh water for at least 15 minutes and seek medical support immediately.
• Do NOT connect anything to a damaged battery. It could heat up, catch fire, or explode.
• Lead-acid batteries can generate explosive gases during operation. Never smoke, allow flames, or sparks near the battery. Ensure sufficient ventilation around the battery.
• When working with a battery, remove all personal metal items like watches, rings, necklaces, and bracelets. Metal items in contact with the battery terminals might cause a short circuit with a very high electric current, which may heat up and melt nearby objects, causing severe burns.

3. Overview

The SCQ25T module has the following connections and features:

• A - 4x shunt input: These are the primary inputs for current measurement via shunts. Labeled IN1, IN2, IN3, IN4.
• B - 4x shunt output: Outputs corresponding to the shunt inputs. Labeled OUT1, OUT2, OUT3, OUT4.
• C - Tank add-on connector: This block provides 4x resistance sensing inputs and 3x voltage sensing inputs for tank level or temperature sensors. It includes terminals for resistance inputs (R1-R4), voltage inputs (U1-U3), common ground (GND), and a common terminal (COM).
• D - 1x Alarm contact: An optional and configurable alarm output. It has terminals for COM (Common), NO (Normally Open), NC (Normally Closed), and GND (Ground).
• E - SICOM port: The communication port for connecting the module to a Simarine PICO system.
• F & G: Represent the included SICOM data cable.

The module itself is compact, with clearly labeled terminals for each function.

4. Installation

4.1 Mounting

CAUTION:

Install the power unit in a clean and dry place protected from accidental spilling of liquids.

To access internal components, remove the shunt cover by unscrewing four screws on top of the cover.

4.2 Cables

CAUTION:

Failure to observe the required cable cross-sections can damage the shunt, wiring, or cause a fire.

SICOM data cable:

For the SiCOM connection, use the supplied cable. If the supplied cable is not available, use the following table to determine the appropriate cable type:

4.3 Connecting

For proper functionality of Simarine's SCQ25T digital shunt and tank module, the following connections are necessary:

1. Connect the SCQ25T to the Simarine PICO via the SICOM port.
2. Connect the consumers/generators minus or plus terminal through one SCQ25T shunt. *
3. Connect any compatible tank or temperature sensors to SCQ25T via the resistance or voltage input. **
4. Connect the alarm contact to execute specific operation on the alarm. ***

* Each correctly connected shunt needs to be configured. This is done via PICO in an easy way. The configuration process is described in PICO's manual.

** Each connected liquid or temperature sensor needs to be configured and calibrated. This is done via PICO in an easy way. The configuration and calibration process is described in Pico's manual.

*** To activate the alarm contact, it is necessary to configure it via PICO in an easy way. The configuration process is described in PICO's manual.

4.4 SCQ25T Connection Diagram

The following describes the example connection of a PICO-Splitter-SCQ25T with voltage level sensors/battery banks and resistance level sensors/temperature sensors:

• PICO Display: Shows system status, including time (12:55), date (02/03/2022), battery percentage (73%), and voltage (13.1V).
• SCQ25T Module: Connected to the PICO system via a SICOM splitter.
• Shunt Connections (Inputs/Outputs):
  • Shunt inputs (IN1-IN4) are connected to the positive terminals of power sources like a Solar panel and Wind generator.
  • Shunt outputs (OUT1-OUT4) are connected to the positive terminals of the loads or battery banks they are monitoring.
  • The negative terminals of loads like Refrigerator and Nautical instruments are connected to the respective shunt inputs (IN1-IN4).
• Tank/Temperature Sensor Connections:
  • Voltage level sensors (0-35V DC) can be connected to the TANK inputs.
  • Resistance level sensors (0-65 kOhm) can be connected to the TANK inputs.
  • NTC Temperature sensors (e.g., -15 to +90°C) can be connected to the TANK inputs.
• Alarm Contact: The alarm contact (D) is shown connected to an Accessory Battery (12V) for potential alarm signaling.
• Battery Bank: A battery bank (up to 3 units) is shown connected to the SCQ25T outputs and also to the PICO system.