Introduction
The Observant C3 Platform can remotely control and monitor the Schneider Electric Altivar 61 Variable speed drives for synchronous and asynchronous motors.
The installation of the VSD is not detailed in this article, installation should be carried out by a qualified electrician. This article focuses on the interface between the Observant C3 and Schneider Electric Altivar 61. Observant will provide support ONLY for the C3 configuration (though note that the MODBUS map below MUST be followed).
Remote control capability should not replace local on/off control or any other fail-safe hardware. An Emergency Stop button and appropriate power disconnects should always be in place at the same location as the VSD.
Application
As part of an Observant system, the device can show:
- Status
- Pressure
- Faults
- Energy Consumption
- Output Frequency
- Pressure Setpoint
- Drive Mode
- Remote Mode
Electrical Connection and Installation
Connection to the VSD is via the RS485 MODBUS connection located inside the front panel
The Observant field unit should be located as close as possible to the controller. RS-485 comms to the Schneider Electric Altivar 600 is via a standard RJ45 4-way to Observant C3 terminal connector:
| Connector terminal | Function |
|---|---|
| 1 | Not Connected |
| 2 | RS-485 B (Observant B) |
| 3 | RS-485 A (Observant A) |
| 4 | GND |
System Protection
Please note that Observant do not take any responsibility for the safety and protection of the system. This is assumed to be the responsibility of the VSD. Any further protection requirements above those provided by the VSD are the responsibility of the installer.
Configuring the Schneider Electric Altivar 600
The VSD acts as a MODBUS Slave device with the C3 as the Master. The slave address, must be configured on both the C3 and the VSD. By default the C3 will be configured to address 1.
The configuration of the VSD MODBUS register layout must adhere to the below:
| Register Type | Register Address | MODBUS Function | Register Offset (from 400001) | Description | Altivar Description |
| Read Holding | 411982 | 3 | 11981 | Actual Pressure | PID Feedback |
| Read/Write Holding | 411921 | 3 & 16 | 11920 | Pressure Set Point | PID Set Point |
| Read Holding | 403202 | 3 | 3201 | Status | Status Word |
| Read Holding | 407122 | 3 | 7121 | Fault | Last Error Occurred |
| Read Holding | 405203 | 3 | 5202 | Drive Mode, Remote Mode | Logic Input States |
| Read Holding | 403203 | 3 | 3202 | Output Frequency | Motor Frequency |
| Read Holding | 410603 | 3 | 10602 | Energy Consumption | Energy Consumed by the Drive |
| Read/Write Holding | 411921 | 3 & 16 | 11920 | Pressure Set Point | PID Set Point |
| Write Holding | 408502 | 3 | 8501 | Motor Control | Command |
External Links
Manufacturer