Anerma Research b.v.

Modular power meter: Volt1000, voltage input module

The Volt1000 measures the voltages on the three phases L1,L2,L3 and the neutral line N. Normally this is the first module in the chain that couples the following current modules to the MODBUS-RTU and send its voltage samples to the current module. Each current module calculates the powers from the measured currents combined with the received voltage samples.
The sharp oled-display on the Volt1000 shows the powers of the attached current modules.
Pushing the touch area above the connectors (not on the display) selects the info seen on the screen. A short push scrolls through the menu's while a long push selects the chosen function.
Modular meter

Each subsequent module that is connected to the Volt1000 will get a MODBUS address.
The Volt1000 is always connected to the MODBUS-RTU master via a RJ45-in plug that also supports the 24V power for the whole modular system. This MODBUS-RTU is terminated internally with a fixed 120 Ohm termination-resistor.
The RJ45-out plug goes, with a standard ethernet patch cable, to next module.

We can resumes this as follows:
  • The MODBUS master (often a PLC) initiates a query to the Volt1000N module (the Volt1000N is always a slave for MODBUS).
  • MODBUS answers can be found in the VOLT1000 or if desired in current module. The Volt1000 acts here as a bridge between MODBUS and the selected current module
  • The Volt1000N forward the power and is the first member of the local meter-bus, and have a connection to the next module.
  • The Volt1000N reads out the power calculated in the current modules and gives the MODBUS response.
  • The Volt1000N keeps track of the energy counters and store them it in his non volatile FRAM memory.
    • Modular meter

    Available parts:

    Volt1000: 3-ph+N voltage sensor