Acrel ADW300 (grid)
The Acrel ADW300 is a DIN-rail three-phase energy meter for low-voltage distribution networks, widely deployed in commercial buildings, factories, and sub-metering installations. This template connects to the ADW300 via Modbus RTU over RS485 and reads per-phase voltages, per-phase currents, per-phase active power, total active power, and cumulative energy. The ModbusCloud Gateway polls these registers continuously, giving your portal a live grid-consumption picture with historical trending. Raw register values are secondary readings and must be scaled by the configured CT and PT ratios to obtain engineering units.
- Protocol
- Modbus RTU
- Connection
- RS485
- Registers
- 11, read only
- Brand
- Acrel
- Last updated
Registers (11)
11 read, 0 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| power | W | Read | |||
| energy | Wh | Read | |||
| currents_a | A | Read | |||
| currents_b | A | Read | |||
| currents_c | A | Read | |||
| voltages_a | V | Read | |||
| voltages_b | V | Read | |||
| voltages_c | V | Read | |||
| powers_a | W | Read | |||
| powers_b | W | Read | |||
| powers_c | W | Read |
Loading registers…
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Use cases
- Monitor total three-phase active power in real time to track building grid consumption against contracted capacity.
- Compare per-phase active power on phases A, B, and C to detect load imbalance across distribution circuits.
- Track cumulative energy to verify monthly grid-import figures against utility invoices.
- Alert on unexpected power spikes to identify rogue loads or equipment faults before they escalate.
- Report per-phase current readings over time to spot gradual overloading of individual circuit breakers.
Installation
On the ADW300, use the front keypad to enter the communication settings menu and configure the Modbus slave address, baud rate (default 9600), data bits, stop bits, and parity to match your ModbusCloud Gateway settings.
Wire the ADW300 RS485 A and B terminals to the corresponding A and B terminals of the ModbusCloud Gateway using shielded twisted-pair cable; ensure the A/B polarity is correct and add a 120-ohm termination resistor at the far end of the bus if the meter is the last device.
In the ModbusCloud portal, add your Gateway, then import the Acrel ADW300 (grid) template, assign the correct Modbus unit ID matching the slave address set on the meter, and save the configuration.
Verify the connection by opening the live register view in the portal and spot-checking the voltages_a, voltages_b, and voltages_c readings against the voltage displayed on the ADW300 LCD; if values are zero or absent, recheck wiring polarity and the slave address setting.
Things to watch for
Why do power and energy readings look far too low?
The ADW300 returns secondary values scaled to its CT and PT inputs. If you have, for example, a 200 A/5 A CT installed, the raw Modbus power value must be multiplied by the CT ratio (40 in this case) to get the true engineering value. Verify the CT and PT ratios configured on the meter match your physical transformers, and apply the same scaling factors in your ModbusCloud channel configuration.
The gateway connects but all register values read as zero or null.
Confirm the Modbus slave address set on the ADW300 matches the unit ID configured in the portal. Then check that the baud rate, data bits, stop bits, and parity on the meter match the Gateway RS485 port settings. A mismatch in any one of these parameters will produce silent read failures without an explicit error code.
Active power reads correctly but phase values are inconsistent with expected load.
Phase voltage and current on phases A, B, and C must be wired in the correct one-to-one correspondence. If voltage and current phases are mixed up, the per-phase active power calculation inside the meter will be wrong even if total power appears plausible. Check that CT clamps on each phase are matched to the voltage input for that same phase.
RS485 communication drops intermittently under load.
Long RS485 runs without proper termination, or cable runs alongside high-current power cables, cause reflections and interference. Use shielded twisted-pair cabling, keep the RS485 bus away from power conductors by at least 30 cm, add a 120-ohm termination resistor at the end of the bus, and limit the total bus length to 1200 metres or less.
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