GOSSEN METRAWATT U281A Single Phase Digital Energy Meters Instruction Manual

: June 12, 2024
: GOSSEN METRAWATT

GOSSEN METRAWATT U281A Single Phase Digital Energy Meters

GOSSEN-METRAWATT-U281A-Single-Phase-Digital-Energy-Meters-
product

Product Information

Product Name: METRALINE I ENERGY
Model: U281A
Operating Instructions: Single-phase Digital Energy-meters
Features: 4 quadrants single phase active energy meter, direct connected, 0.02 to 40 A, 1 tariff, 1 S0 output
Certification: MID certified

Product Usage Instructions

This device must be installed and maintained ONLY by qualified and duly authorized personnel.
Before installation, ensure that there is no voltage applied to the device.
Refer to the wiring diagram provided in the user manual for proper installation.
Ensure that the cable stripping length is appropriate and the terminal screws are tightened to the recommended torque.
The device can be directly connected for up to 40 A.
Use a screwdriver with PZ1 head for the main terminal screws and a screwdriver blade with 0.8×3.5 mm dimensions for the communication terminals.

4 quadrants single phase active energy meter, direct connected, 0.02 to 40 A, 1 tariff, 1 S0 output

ModelCommunication
U281A 1 S0 Pulse outputs MID certified

RISK OF ELECTRIC SHOCK, BURNS OR EXPLOSION

This device must be installed and maintained ONLY by qualified and duly authorized personnel.
During its installation, be sure there is no voltage applied.

Front View

$GOSSEN-METRAWATT-U281A-Single-Phase-Digital-Energy-Meters-fig- $1$$

Command Button
(–>) imported symbol (for Energy or Power)
7 digit LCD, for Energy and instantaneous values visualization)
(–>) exported symbol (for Energy or Power)
Metrological LED (5000 pulses per kWh)

Displayed values

$GOSSEN-METRAWATT-U281A-Single-Phase-Digital-Energy-Meters-fig- $10$$

The main page is shown at the meter power on, and whenever “Command Button” is not pushed for 20 seconds. This page automatically displays the energy counter which is increasing at that moment; on the top line, the direction of the energy is shown ( – > imported, < – exported).
By pushing the “Command Button”, the following pages will appear (rotating):
- The Active energy that is currently increasing, or the Active energy that has increased more recently (Imported or Exported)
- The alternative Active energy (Exported or Imported)
- The instantaneous Power value (imported or Exported)
- The Line Voltage
- The Line Current
- The Line Frequency
- The Power Factor
- The Firmware Release (*)
- The Firmware Checksum (*)
- The Display test Page (*)
- (*) required by MID normative

$GOSSEN-METRAWATT-U281A-Single-Phase-Digital-Energy-Meters-fig- $2$$

Power factor
Convention according to IEC 62053-23

Dimension

Sealable terminal coversSupport

$GOSSEN-METRAWATT-U281A-Single-Phase-Digital-Energy-Meters-fig- $5$$

Wiring diagram

PZ1Cable stripping length and max. terminal screw torque

40 A direct connection main terminals Screw driver PZ1Cable
Communication terminals Screw driver blade 0.8×3.5 mm

MID calibrated

Applications

Please read this important information!

Intended Use / Use for Intended Purpose

The instrument is a digital multifunctional energy meter certified in accordance with MID. Integrated 4-quadrant measurement permits measurement of energy import and export.
Thanks to MID certification, acquired data (display) can also be used for the purpose of billing energy costs to third parties.
Via integrated communication interfaces, the values are also forwarded to superordinate management systems. Protection against tampering is provided through adequate measures (tamper-proof cover).
The safety of the operator, as well as that of the instrument, is only assured when it’s used for its intended purpose.

Use for Other than Intended Purpose
Using the instrument for any purposes other than those described in the product documentation is contrary to use for the intended purpose.

Liability and Guarantee
Gossen Metrawatt GmbH assumes no liability for property damage, personal injury, or consequential damage resulting from the improper or incorrect use of the product, in particular, due to failure to observe the product documentation. Furthermore, all guarantee claims are rendered null and void in such cases.

Nor does Gossen Metrawatt GmbH accept any liability for data loss.

Scope of Delivery

1 instrument (U281A)
1 operating instructions

Safety Instructions

Read and follow these instructions carefully and completely in order to ensure safe and proper use. Keep it for future reference.

DANGER

Electric shock due to live components!
Life endangering due to electric arcs!

Touching voltage-conducting components is life-endangering!

The installation and any work performed on the instrument may only be carried out by a qualified electrician.
Observe and comply with all safety regulations which are applicable for your work environment.
Wear suitable and appropriate personal protective equipment (PPE) whenever working with the instrument.
During installation, the installation environment must be voltage-free. For that, observe the five safety rules in accordance with DIN VDE 0105-100.

ATTENTION

Faulty installation & incorrect operation
Faulty installation/incorrect operation can damage your instrument/system. Risk of malfunctions and disruptions

Comply with the specified technical data and conditions
Do not install the instrument in potentially explosive atmospheres.
Do not install the instrument in locations where it may be exposed to direct sunlight.
Install and operate the instrument only if it and all connection cables and leads are in good working order and damage-free. Inspect the instrument at regular intervals.
If the instrument doesn’t function flawlessly, permanently remove it from operation and secure it against inadvertent use.

Symbols on the Instrument

European conformity marking
Double insulation (protection category II)
CE and metrology mark with indication of year (M22) and registration number of the notified body for module D, country-specific calibration validity period

CE M 22 0051 398 / MID

Standards, Regulations and Directives

DIN 43880
EN 50470-1
EN 50470-3
EN 60715
EN 62053-31
IEC 62053-23

Transport & Storage

Transport and store the instrument only within the limits of permissible ambient conditions. Also use suitable packaging in order to ensure adequate protection against environmental influences and mechanical stress.

Maintenance

The instrument is maintenance-free. Keep outside surfaces clean.
Clean the instrument only with a dry cloth.

Recalibration

Comply with national recalibration regulations and laws. The calibration period in Germany is 8 years.
A broken manufacturer’s seal means equals invalidated calibration. The instrument must not be used for billing purposes.

Repairs & Manufacturer’s Guarantee

If your instrument requires repair, please contact our service department; see Support & Contact.
Unauthorized modification of the instrument is prohibited. This also includes opening the meter.
If it can be ascertained that the instrument has been opened by unauthorized personnel, no guarantee claims can be honored by the manufacturer with regard to per-sonal safety, measuring accuracy, compliance with applicable safety measures or any consequential damages. If the manufacturer’s seal is damaged or removed, all guarantee claims are rendered null and void.
The instruments are guaranteed for a period of 2 years after shipment. The manufacturer’s guarantee covers materials and workmanship. Damage resulting from use for any other than the intended purpose or operating errors, as well as any and all consequential damage, are excluded.

Disposal & Environmental Protection

The following comments refer specifically to the legal situation in the Federal Republic of Germany. Owners or end users who are subject to other national requirements are required to comply with the respectively applicable national requirements and to implement them correctly on site
The symbol on the left depicting a crossed-out garbage can on wheels refers to the legal obligation of the owner or end user (Ger-man electrical and electronic equipment act ElektroG and German battery act BattG) not to dispose of used electrical equipment and batteries with unsorted municipal waste (“household trash”).
Old devices, electrical or electronic accessories and waste batteries (including rechargeable batteries) used in Germany can be returned free of charge to Gossen Metrawatt GmbH or the service provider responsible for their disposal. Further information can be found on our website.

Technical Data

Data in compliance with EN 50470-1, EN 50470-3 and EN 62053-31| | | direct connection 40 A

S0 Pulse

---|---|---|---
General characteristics

• Housing DIN 43880

|

DIN

| |

1 Module

• Mounting| EN 60715| 35 mm| | DIN rail
•Depth| mm| | 70
• Weight| g| | 60
Operating features

• Connection DIN 43880

|

n° wires

| |

2

• Storage of energy values and config.| Internal flash memory| –| | yes
Approval (according to EN 50470-1, EN 50470-3)

• Reference Voltage Un

|

VAC

| |

230

• Reference Current (Iref)| A| | 5
• Minimum Current (Imin)| A| | 0.25
• Maximum Current (Imax)| A| | 40
• Starting Current (Ist)| A| | 0.02
• Reference Frequency (fn)| Hz| | 50
• Number of phases (number of wires)| –| | 1 (2)
• Certified Measures| kWh| | kWh T1, kWh T1
• Accuracy| Active Energies (accor. to EN 50470-3) and Active Powers|

class

| |

B

Supply Voltage and Power Consumption

• Operating Supply Voltage range

|

V

| |

184 … 276

• Maximum Power Dissipation (Voltage circuit)| VA (W)| | ⩽2 (1)
• Maximum VA burden (Current circuit) @ Imax| VA| | ⩽1
• Voltage Input Waveform| –| | AC
• Voltage impedance| MΩ| | 1
• Current impedance| mΩ| | ⩽20
Overload capability

• Voltage

|

continuous

|

VAC

| |

276

• Voltage range

|

VAC

| |

184 … 276

• Current range| A| | 0.02 … 40
• Frequency range| Hz| | 45 … 65
• Measured Quantities| –| | kWh, kW, V. A, PF, Hz
Display features

• Display type

|

LCD backlightet

|

–

| |

7 (2 Decimal)

• Front mounted red LED (meter constant) proportional to active imp/exp Energy

|

p/kWh

| |

5000

Safety

• Protective class

|

class

| |

II

• Pulse Rate

|

p/kWh – p/kvarh

| |

1000

• For communication moduls connection

(LAN-TCP/IP / M-Bus / Modbus RTU / KNX)

|

–

| |

ja-yes-si

Connection terminals

• Screwdriver for mains terminals head with Z +/-

|

POZIDRIV

| |

PZ1

• Temperature range

|

°C

| |

-25 … +70

Environmental conditions (operating)

• Temperature range

|

°C

| |

-25 … +55

(*) The metering equipment must be installed inside a cabinet with IP rating IP51 or better.

Support and Contact

Please contact us at

+49 911 8602-0
Monday – Thursday: 08:00 Uhr – 16:00 Uhr
Friday: 08:00 Uhr – 14:00 Uhr
support.industrie@gossenmetrawatt.com.

Please contact GMC-I Service GmbH for repairs, replacement parts and calibration:

CE Declaration

The device fulfills all requirements of applicable EU directives and national regulations.
We confirm this with the CE mark.
The CE declaration is available on our website:
https://www.gmc-instruments.de/en/services/download-center/download-center/.

Gossen Metrawatt GmbH