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This document outlines the process for upgrading existing M110 and M800 series (Legacy series) Remote Terminal Units (RTUs) to the newer MyDro RTUs, specifically the 150/850 models. It serves as a supplement to the standard installation manual, highlighting key differences and providing guidance for a smooth transition. The MyDro RTU is designed to be an easy upgrade, with kits including all necessary parts to mount components into the same form factor enclosure as the previous unit. This means that few, if any, new holes will be required for installation. Wire terminals are located in similar general areas as on the Legacy boards, simplifying the rewiring process, and the MyDro features convenient removable terminals.
Before beginning the upgrade, it is strongly recommended to review the entire document and the standard installation manual. Technical support is available to assist with any questions. To minimize downtime, installers should confirm that the MyDro RTU is ready for installation by temporarily connecting an antenna and powering it up with battery power to ensure the radio is active and the carrier is appropriate for the location. Prior to decommissioning the existing RTU, it's crucial to exercise each sensor to confirm proper functionality, which will help ensure conclusive final tests of the MyDro.
The MyDro RTU offers enhanced electronics compared to the Legacy series. Notable improvements include configurable auxiliary output voltages and isolated analog inputs. Unlike the Legacy RTUs, the MyDro does not directly support the Wet Well Module (WWM) but does support the pump run load sensors associated with it. An optional Safe Module Plus is available, which improves upon the WWM and provides four pulse accumulators, typically used with rain tipping buckets and pulse-based flow meters. Future product enhancements for the MyDro platform will focus on communications and Modbus, with over-the-air firmware upgrade capability making it easy to deliver these improvements.
For power input, the top two terminals on the left are typically where power from a 120 volts to 12 VAC transformer enters. For solar-powered RTUs, the new wiring will be similar, but power supplied by a solar panel is polarity sensitive, and an independent solar charge regulator is recommended. The battery terminals are managed by a smart charging circuit that reduces current as the battery voltage approaches 13 volts, preventing overcharging even with solar panels providing up to 20 VDC. Auxiliary power terminals offer software-selectable voltages of 0, 12, or 24 VDC, with 24 VDC being the preferred option for most 4-20 mA transducers. Any components powered by auxiliary power must be compatible with the selected voltage setting.
Digital inputs on the MyDro feature software-selectable wire fault supervision, making end-of-line (EOL) resistors optional. When the "no-fault (NF)" setting is chosen on the LCD digital input "Config." screen, EOL resistors should not be installed. Multiple sensors can be wired to a common (chassis) ground with the MyDro digital input, unlike the Legacy series which required 1,800 ohm resistors in series. For EOL resistors to be effective, they must be installed parallel to the sensor switch, not on the RTU terminals.
The MyDro's two onboard analog inputs are isolated, a feature not present on the Legacy board. If the instrument's power is sourced from the MyDro aux terminals, an additional conductor from the negative terminal of the analog input to aux is required to complete the loop. The aux voltage is software selectable (0, 12, or 24 VDC), with 24 VDC being recommended for most 4-20 mA transducers to prevent voltage starvation when multiple devices are on the current loop. Installers should note the analog jumper position on the Legacy RTU (0–5 volts or 4-20 mA) as the MyDro defaults to 4–20 mA.
Output relays on the MyDro have higher ratings than Legacy RTUs (maximum AC voltage 120 volts, maximum DC 30 volts, maximum current 5 amps). It is discouraged to have high voltage AC inside the Mission enclosure for safety and to prevent induced voltage. A critical difference to note is that the MyDro relay's normally open (N/O) and normally closed (N/C) terminals are opposite to those of Legacy units.
For I/O expansion, the MyDro uses a different expansion module interface, and Legacy expansion boards are not compatible. The MyDro expansion communication cable (8') is RS485-based, allowing for long distances. If I/O expansion is present, consider moving the MyDro expansion module outside the enclosure, especially for FlatPak enclosures where this is not optional. MyDro expansion modules offer similar or better I/O characteristics than Legacy modules.
The rewiring process is facilitated by the MyDro's removable terminals. A recommended strategy is to remove one wire at a time from the Legacy RTU and immediately terminate it onto the corresponding removable terminal on the MyDro. Photographing the existing installation and labeling wires before decommissioning the Legacy RTU is also a good practice. The steps involve turning off AC power, removing leads, unscrewing the SMA antenna connector, removing the four screws holding the PCB, and then reterminating conductors. Powering up the RTU and inserting one bank of removable terminals at a time can help identify wiring problems.
Configuration adjustments may be necessary as Legacy RTUs might have had special settings. Some settings will need to be configured via the web portal or with tech support, while others may be obsolete due to the MyDro's enhanced electronics. Configurable settings accessible on the LCD screen with an electric key include digital input setup (channel, mode, debounce), analog input (channel, mode, filter), analog scaling (channel, offset, range, units), auxiliary output voltage, relay communication failure behavior, battery test, server connection, and miscellaneous settings (language, temperature units, audio, screen saver). Alarm threshold settings are configured via the web portal.
After installation, it is important to test the MyDro. This includes checking input voltages with a multi-meter, exercising all inputs to confirm correct values on the LCD and web portal, and confirming proper operation of relays and analog output via the web portal. It is crucial to remember that the N/O and N/C terminals on the MyDro's output relays are opposite to those of the Legacy RTU. All automated remote control functions and fail-safe operations should be confirmed as working correctly. A fail-safe test can be performed by disconnecting the antenna to take the RTU offline. Finally, contact Mission Technical Support to associate the new radio identifier (IMEI) with the data from the previous RTU.
General| Battery Type | CR2032 |
|---|---|
| Display | LCD |
| Accuracy | ±0.03 mm |
| Repeatability | 0.01 mm |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
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