Product / ZEM-61

The ZEM-61 is a highly accurate, wireless three phase electricity monitor. It can monitor energy consumption patterns in equipment and buildings remotely via the web or local area network. This provides facility and energy managers with targeted energy consumption information essential for increasing efficiency and reducing overall power consumption.

The ZEM-61 product can be configured with a range of CT’s and Rogowski coil options to measure currents from 0.1A to 10kA per phase. A list of CT options is available on the product datasheet.

CT & Rogowski Coil Installation

The ZEM-61 Current Transformers (CT’s) or Rogowski Coils must be connected as shown in Figure 1 below. CT’s should be clipped around the corresponding live conductors of each phase being monitored, i.e. CT1 should be clipped around L1, CT2 around L2 etc. 

Important Note: Accuracy may be compromised if a large CT is used in a low-current situation, or if the conductor does not pass through the centre of the CT. Rogowski coils are not as sensitive to the position of the conductor. 

ZEM-61 CT Photo

Each CT is fitted with a label so it can be installed in the correct terminal on the ZEM-61. Accuracy may be compromised if the CT’s or Rogowski coils are not paired with the correct terminals on the ZEM-61.

ZEM-61 CT Diagram

Important Note: CT’s should be positioned so that the arrow on the base of the CT (or on the connector for Rogowski coils) points in the direction of the electrical load, and away from the source.

CT’s & Rogowski Coils are connected to the ZEM-61 via the glands shown in Figure 2 below:

ZEM-61 Gland Positions

If it is necessary to remove the CT’s, ensure they are correctly re-attached to the screw terminals as shown in Figure 3. The red wire should be connected to the screw terminal labelled K and the black wire should be connected to the screw terminal labelled L. Also ensure that the label on the CT is matched to the label on the CT cable.

ZEM-61 CT Terminals

Important Note: CT’s & Rogowski Coils are not interchangeable – reading accuracy may be compromised if they are mixed up.

ZEM-61 Rogowski Coil Clip

The diagram below shows the internal connections within the ZEM-61. In the event that it is necessary to disconnect any of the wires, it is important to ensure that they are re-connected correctly.

ZEM-61 Board Terminals

Voltage Signal Installation

The leads in the 5-core voltage cable are colour coded to conform to European CENELEC standards. Please note that on some versions of the ZEM-61 voltage cables are not included. In this case, appropriately rated cables should be supplied by the installer. The CENELEC standard insulation colours are as follows:

  • L1 – Brown
  • L2 – Black
  • L3 – Grey
  • N – Blue
  • Earth – Green / Yellow

ZEM-61 Voltage Inputs

Important Note: ZEM-61 voltage signals should be supplied from the 3-phase system being monitored (example below). Accuracy will be compromised if this is not the case.

ZEM-61 Connection Diagram

The ZEM-61 voltage input wires (L1,L2 &L3) should be connected to the same 3-phase circuit that is being monitored via a switched junction box and breaker to protect the power cable (CSA = 0.75mm²).

Note: It is also possible to use the ZEM-61 as a Single Phase 3 Channel measurement device all 3 voltage wires (L1,L2 &L3) must be connected together in this case.

Mounting Instructions

The ZEM-61 requires 2 screws or rivets for wall mounting. These holes should be positioned on a vertical surface spaced 172mm vertically apart. The head of the screw or rivet should be less than 8.5mm in diameter and the shaft thickness should be less than 4.5mm. Screws should be left unscrewed by more than 5mm before installing the enclosure. Once the keyhole shaped holes in the housing are placed on the screws, the screws can be tightened to secure the housing. The ZEM-61 should be mounted with the cable glands facing downwards.

Alternatively the ZEM-61 can be mounted with double-sided adhesive foam tape. This can be useful when installing inside a live panel where drilling for screws or rivets is not an option. The image below shows a 19mm x 10m roll of polyethylene foam adhesive tape – two strips of this tape should securely mount the ZEM-61 within an electrical panel.

ZEM-61 PE Foam for Mounting

Safety

The ZEM-61 enclosure should only be opened by suitably qualified personnel. All parts of the circuit within the enclosure must be considered to be at dangerously high mains voltage. For information on the symbols that appear on the certification label of the ZEM-61 product range, please refer to the “Explanation of Symbols” section of this user guide.

Note: Installation of the ZEM-61 should be carried out only by personnel qualified in the installation of electrical equipment.

Sensors

The following is a list of all sensors available on the ZEM-61 product range. The reporting mode, reporting interval and logging enabled columns refer to the factory default settings, these settings can be configured from the Gateway.

Note: for “interval” sensors which report (for example) Total Interval kWh, data points will be time stamped at the start of the period that the value relates to. 

Sensor ID

Name

Description

Reporting Mode

Reporting Interval

Logging Enabled

300

Phase A kWh

Phase A kWh, cumulative

OFF

15

Yes

301

Phase B kWh

Phase B kWh, cumulative

OFF

15

Yes

302

Phase C kWh

Phase C kWh, cumulative

OFF

15

Yes

303

Phase A RMS Current

Phase A RMS Current, averaged over 30 sec

OFF

15

Yes

304

Phase B RMS Current

Phase B RMS Current, averaged over 30 sec

OFF

15

Yes

305

Phase C RMS Current

Phase C RMS Current, averaged over 30 sec

OFF

15

Yes

306

Phase A RMS Voltage

Phase A RMS Voltage, averaged over 30 sec

OFF

15

Yes

307

Phase B RMS Voltage

Phase B RMS Voltage, averaged over 30 sec

OFF

15

Yes

308

Phase C RMS Voltage

Phase C RMS Voltage, averaged over 30 sec

OFF

15

Yes

309

Phase A kVAh

Phase A Volt-Amp hours reactive, cumulative

OFF

15

Yes

310

Phase B kVAh

Phase B Volt-Amp hours reactive, cumulative

OFF

15

Yes

311

Phase C kVAh

Phase C Volt-Amp hours reactive, cumulative

OFF

15

Yes

312

Phase A Peak Current

Phase A Peak Current measured during the reporting interval

OFF

15

Yes

313

Phase B Peak Current

Phase B Peak Current measured during the reporting interval

OFF

15

Yes

314

Phase C Peak Current

Phase C Peak Current measured during the reporting interval

OFF

15

Yes

315

Phase A Peak Voltage

Phase A Peak Voltage measured during the reporting interval

OFF

15

Yes

316

Phase B Peak Voltage

Phase B Peak Voltage measured during the reporting interval

OFF

15

Yes

317

Phase C Peak Voltage

Phase C Peak Voltage measured during the reporting interval

OFF

15

Yes

324

Phase A Active Power

Phase A Active Power, instantaneous value

OFF

15

Yes

325

Phase B Active Power

Phase B Active Power, instantaneous value

OFF

15

Yes

326

Phase C Active Power

Phase C Active Power, instantaneous value

OFF

15

Yes

327

Phase A Apparent Power

Phase A Volt-Amps, instantaneous value

OFF

15

Yes

328

Phase B Apparent Power

Phase B Volt-Amps, instantaneous value

OFF

15

Yes

329

Phase C Apparent Power

Phase C Volt-Amps, instantaneous value

OFF

15

Yes

330

Phase A Power Factor

Phase A Power Factor, averaged over the reporting interval

OFF

15

Yes

331

Phase B Power Factor

Phase B Power Factor, averaged over the reporting interval

OFF

15

Yes

332

Phase C Power Factor

Phase C Power Factor, averaged over the reporting interval

OFF

15

Yes

333

Total kWh

Total kWh (sum of three phases), cumulative

OFF

15

Yes

334

Total kVAh

Total VAhR (sum of three phases), cumulative

OFF

15

No

335

Total Active Power

Total Active Power (sum of three phases), instantaneous value

OFF

15

Yes

336

Total Apparent Power

Total Active Power (sum of three phases), instantaneous value

OFF

15

Yes

337

Total Power Factor

Total Power Factor, average of three phases over reporting interval

OFF

15

Yes

338

Interval Phase A kWh

Phase A kWh usage in the reporting interval

Snap to Clock

15

Yes

339

Interval Phase B kWh

Phase B kWh usage in the reporting interval

Snap to Clock

15

Yes

340

Interval Phase C kWh

Phase C kWh usage in the reporting interval

Snap to Clock

15

Yes

341

Interval Total kWh

Total kWh usage (sum of three phases) in the reporting interval

Snap to Clock

15

Yes

Note: The max kWh value for the ZEM-61 is 21,474,836 kWh. Software packages should be configured to compensate for this threshold being crossed.

Settings

The following table lists node specific settings for the ZEM-61 product range. It is also possible to set the counters on cumulative sensors from the Node Settings > Sensor Settings page.

Name

Description

Default Value

Connection Type

Star / Delta, 3-wire / 4-wire

4-wire

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