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Power Meter

Nicolas Lerch
Updated

The power meter is a multi-functional measuring device for all loads that need to be considered by our Energy Management (GATEWAY and HARMON-E). In combination with the supplied Rogowski Coils, the power meter performs power measurement at electrical substations, individual circuits or renewable energy sources. 

While we provide a step-by-step guide, we reserve the right to make mistakes here. The electrician is still responsible for following the manufacturer’s (Phoenix Contact) official manual and for following industry policy for electrical works.

 

Technical Data

General
Manufacturer Phoenix Contact
Product type EEM-MB371
Product number 2907955
Communication Modbus/TCP
Electrical specifications
Supply voltage range 100…240 VAC
Input voltage Signal 24 V DC
Current transformers Rogowski transformers
Mechanical specifications
Dimensions (H Ă— W Ă— D) 90 Ă— 90 Ă— 71.7 mm
Weight (incl. packaging) 392 g
Mounting form DIN rail

 

1 Mechanical Installation

1.2 Mount device

Install the power meter onto a DIN rail, e.g. in the transformer substation of the distribution cabinet.
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To mount the power meter on the DIN rail, hold it at a slight angle and hook the upper edge into the DIN rail. Then gently press it down until it clicks into place.
image 1.png

 

1.2 Unmount device

In case you need to change the location of the installation.

 

image 2.png
To unmount the power meter from the DIN rail, use a flathead screwdriver and dislodge it from the bottom.

 

image 3.png

 

1.3 Check installation

Confirm that the power meter is fixed in place.
image 4.png

 

 

2 Wiring

Typical faults arise when mixing up RC1 and RC2 and so forth. Please double check your wiring when done, and ensure that the reference voltages are connected correctly.
Oberserve the terminals before starting the wiring
image 5.png

 

Pin Interface
RC1, RC2, RC3 Rogowski coil (current measuring input)
W1, W2, W3 RCP cable white
B1, B2, B3 RCP cable blue and shield

 

2.1 Connect Rogowski Coils to the supply 

Connect each coil (RC) to the correct phase (L). The coils can be fitted onto power lines or bus bars.

RC1 → L1 RC2 → L2 RC3 → L3
Don’t mix up the coils and phases! This will cause measurement errors that can only be fixed by re-doing the wires.

 

2.2 Wire Rogowski Coils to the power meter

 

Wire each coil (RC) to the terminals on the power meter.

 

image15.png
The silver wire is the shield and typically connected on the B contact together with the blue wire.

 

2.3 Connect Voltages

V1 → L1 V2 → L2 V3 → L3 VN → N
Connect each voltage measuring input (V) to the correct phase (L).
image 7.png

 

 

You can supply the power meter with a bridge from V1 and make a bridge from VN to N(L) for the neutral.

2.4 Connect Ground

⏚ → PE
Connect the ground
image 8.png

 

Your final wiring should follow the schematics outlined in the manufacturer’s manual.
image 9.png

 

2.5 Connect Network at X1-ETH

Plug the ethernet cable into the port at the bottom right corner of the power meter.
image 10.png

 

2.6 Connect Power Supply at L and N

You can connect the device supply either via AC or DC:

  • Connection L/N (AC)
  • Connection +/- (DC)
Connection L/N (AC)
image 11.png

 

Connection +/- (DC)
image 12.png

 

Congratulations! You are done.

 

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