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How to add energy meter Schrack MGRZK465?

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⚡ Reduxi Controller · Knowledge Base

How to add energy meter Schrack MGRZK465

Install the direct-connected Schrack MGRZK465 meter (65 A) and connect it to the Reduxi Controller via Modbus RTU.

⏱ approx. 20–30 minutes
🔧 Schrack MGRZK465 · Reduxi Controller
📄 Modbus RTU (RS485)
Schrack MGRZK465 three-phase energy meter
Schrack MGRZK465 – direct-connected three-phase meter, 65 A, Modbus RTU
📋  In this article
  1. Technical documentation
  2. Required equipment
  3. System overview & wiring
  4. Device configuration on the meter
  5. Log in to the Reduxi web interface
  6. Add the Schrack MGRZK465 to Reduxi
  7. Check the readings
  8. Summary
  9. Common issues
  10. Related articles

1 Technical documentation

The Schrack MGRZK465 is a compact, MID-certified three-phase meter for direct connection up to 65 A with an RS485 Modbus RTU interface. No current transformers are needed. The Reduxi Controller reads it over RS485 and uses it as grid meter or as a sub-meter (e.g. heat pump, wallbox, PV).

Connection
Direct · up to 65 A
System
3-phase, 4-wire
Interface
Modbus RTU (RS485)
Width
3 TE (53.6 mm)
Approval
MID
Measures
Active & reactive energy

Manufacturer documents:

2 Required equipment

  • Schrack MGRZK465 energy meter (3 TE, DIN rail)
  • Copper conductors for the main circuit, 1.5–16 mm², and a PZ2 screwdriver (3.5 Nm)
  • Twisted-pair, shielded data cable for RS485 (e.g. LiYCY 2×2×0.5 mm² or CAT cable)
  • Ferrite bead for the RS485 line (recommended by Schrack)
  • Reduxi Controller with a free RS485 port (terminal block GND · A · B · 5V)
  • Laptop or tablet with internet access, for the Reduxi Configurator

⚠️

Installation by a qualified electrician only The meter is wired directly into the main circuit (up to 65 A). Switch off and secure the circuit before starting work.

3 System overview & wiring

The full load current flows through the meter. Measured values are passed to the Reduxi Controller via an RS485 line (Modbus RTU).

System overview: router, Reduxi Controller and Schrack MGRZK465 via RS485
System overview – the meter is connected to the Reduxi Controller via RS485 A/B; the Controller reaches the internet via Ethernet or Wi‑Fi

Wiring

Wiring diagram Schrack MGRZK465 to Reduxi Controller
Wiring diagram – RS485 A to terminal 16, RS485 B to terminal 15
Terminal Function Note
1 / 4 / 7 L1 / L2 / L3 – grid side (via 65 A fuses) 1.5–16 mm², M5, 3.5 Nm
3 / 6 / 9 L1 / L2 / L3 – load side 1.5–16 mm², M5, 3.5 Nm
10 / 11 N – grid side / load side Neutral must be connected
16 RS485 A → Reduxi Controller RS485 A
15 RS485 B → Reduxi Controller RS485 B

Auxiliary terminals: 1–2.5 mm², 1.2 Nm. Always cross-check against the connection diagram printed on the meter.

RS485 connection to the Reduxi Controller

The Controller's RS485 terminal block has four pins: GND · A · B · 5V. Only A and B are used.

Schrack MGRZK465 Reduxi Controller
Terminal 16 (A) RS485 A
Terminal 15 (B) RS485 B
Cable shield Earth on one side only

💡

Ferrite bead Schrack recommends a ferrite bead on the RS485 line, with the cable looped through it twice, close to the meter.

ℹ️

A/B swapped? If the Controller does not receive any data although all settings are correct, swap the two RS485 wires – A/B naming differs between manufacturers. Terminate the bus with a 120 Ω resistor at both ends if the line is long or several devices share the bus.

4 Device configuration on the meter

The MGRZK465 is delivered with fixed factory defaults for the RS485 interface. They work with Reduxi as they are – no setting on the meter is needed for a single meter. Note them down – you will need them later (see ⁠Point 6⁠).

Parameter Default
Modbus address 33
Baud rate 19200
Data bits / parity / stop bits 8 / None / 2

⚠️

Note: address 33, not 1 Unlike most meters, the MGRZK465 uses Modbus address 33 and 2 stop bits by default. Entering 1 or 1 stop bit in Reduxi is the most common reason the test fails.

ℹ️

Several meters on one bus Each meter on the same RS485 line needs its own address. To change the address or baud rate, follow [menu path from the MGRZK operating manual]. Baud rate and frame format must be identical on all devices of the bus.

5 Log in to the Reduxi web interface

You can open the Reduxi web interface in two ways:

Remote
📱
Reduxi app
Via tunnel connection · works from anywhere
🖥️
Web browser
In the local network · via IP address or reduxi.local
📱 5.1 Via the Reduxi app
1
Open the app and log in
Launch the Reduxi app on your smartphone or tablet and log in with your credentials.
2
Open Reduxi devices
Tap the menu icon (three lines, top left) and select Reduxi devices.
3
Activate the tunnel connection
Switch on the tunnel connection and wait a moment until it is active.
4
Open the configurator
Tap Open configurator. The Reduxi web interface opens.

Reduxi app – Reduxi devices

Activate the tunnel connection (step 3)

Reduxi app – Open configurator

Open configurator (step 4)
🖥️ 5.2 Via a web browser
1
Open the login page
On a device in the same network, open a web browser and enter the controller's IP address or http://reduxi.local. You can find the controller's IP address in your router's device list or in the Reduxi app under Reduxi devices.
2
Log in
Username: admin · Password: admin (factory default)

Reduxi Controller login screen

Reduxi Controller login screen

Reduxi Controller web interface

Controller web interface after login

6 Add the Schrack MGRZK465 to Reduxi

Once the meter is wired and configured (see ⁠Point 4⁠), add it as a new device in the Reduxi web interface.

6.1 Basic settings

1
Click + Add device
In the Reduxi web interface, select + Add device.
2
Define the device
Device type: Energy meter
Type: Schrack MGRZK465
Name: any name, e.g. Schrack MGRZK465
Include to strategy: tick Measurement devices for your strategy (e.g. Energy manager new)
Confirm with Next.

Add device button

+ Add device

Basic device settings

Device type, type, name and strategy

6.2 Communication settings

Enter the following values – they must match the settings on the meter (see ⁠Point 4⁠):

Parameter Value
Connection Local serial port
Port RS-485 port 1 – the controller's RS485 terminal
Baud rate 19200 bits/s
Data bits 8
Stop bits 2
Parity None
Modbus Unit ID 33 – factory default of the meter
Energy counter 1–4 Import - active energy · Export - active energy · Import - reactive energy · Export - reactive energy (default)
Communication channel and device configuration
Communication channel and device configuration

6.3 Test communication

Click Test communication to check whether the Reduxi Controller can read data from the meter.

Test communication button
Test communication

✅

Test successful Close the results window and confirm your entries with Done.

Successful test result

Successful readout from the meter

Confirm with Done

Confirm with Done

⚠️

Test failed Close the results window and check the RS485 wiring, the Modbus settings on the meter and the communication settings in the Reduxi web interface. Then repeat the test. See also ⁠Common issues⁠.
Unsuccessful test result
Unable to communicate with device

7 Check the readings

In the Reduxi web interface, open Devices → Schrack MGRZK465 → Last measurements.

Last measurements of the meter
Last measurements – current, voltage, power and energy per phase
What you see Meaning
Communication error OFF, values are read Communication works.
Communication error ON, all values are 0 No communication – the settings do not match. Check ⁠Point 4⁠ and ⁠Point 6.2⁠, or see ⁠Common issues⁠.
Power with the wrong sign Energy-flow direction reversed – see Common issues.

ℹ️

Grid meter for load management If this meter is installed at the grid connection point, Reduxi uses it as reference for load management, PV surplus charging and peak shaving. As a sub-meter it shows the consumption or generation of a single circuit.

✓ Summary

Wiring (Point 3): grid side to terminals 1/4/7/10, load side 3/6/9/11 (neutral is mandatory), RS485 A → 16, B → 15.

Meter setup (Point 4): nothing to change – defaults are address 33, 19200 baud, 8N2.

Reduxi (Points 5–7): add the meter as Modbus RTU device with exactly these values and confirm live readings with Test communication.

→ Common issues

Issue Solution
Test communication fails / no data Check the unit ID (33), baud rate (19200), parity (None) and stop bits (2) in Reduxi. Swap the RS485 wires A/B. Check that the correct RS485 port is selected.
Meter shows no or implausible values Check that the neutral conductor is connected – the meter needs it. Make sure line in/out are not swapped.
Communication drops occasionally Use shielded twisted-pair cable, add the ferrite bead, earth the shield on one side, and add 120 Ω termination on long lines.
Several meters on one bus – only one responds All MGRZK meters leave the factory with address 33. Give each meter a unique address before connecting them to the same bus.

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