Gossen MetraWatt MID U1281, MID U1289, MID U1387, MID U1389, MID U1381 Operating Instructions Manual

Operating Instructions

ENERGYMETER|MID
Electronic Active Energy Meters
U1281/U1289/U1381/U1387/U1389

MAIN PISTRIBUTION – PRODUCTION

Edited in Germany • Subject to change without notice • A pdf version is available on the Internet

GMC-I Messtechnik GmbH
Südwestpark 15
90449 Nürnberg • Germany
Phone [phone]
Fax [phone]
E-Mail [e-mail]
www.gossenmetrawatt.com

3-349-618-15

3/12.18

1 Safety Precautions – Symbols

– Check the specified nominal voltage on the serial plate

before placing the instrument into service.
– Observe the maximum voltage of the pulse output.
– Make sure the connector cables are not damaged, and

that they are voltage-free while wiring the instrument.
– If it can be assumed that safe operation is no longer pos-

sible, the instrument must be immediately removed from

service (disconnect input voltage!). Safe operation can no

longer be relied upon if the instrument demonstrates visi-

ble damage.

The device may not be placed back into operation until

troubleshooting and repair have been performed, and

calibration and dielectric strength have been tested and

approved at our factory or an authorized service center.
– Voltage conducting parts may be exposed if the cover is

opened.

If balancing, maintenance or repair of a live open instru-

ment is required, work may only be carried out by trained

personnel who are familiar with the dangers involved.

Capacitors inside the instrument may be dangerously

charged, even after it has been disconnected from all

power sources.
– After the instrument has once again been closed subse-

quent to repair or maintenance work, insulation must be

tested with high-voltage in accordance with the values

specified in the technical data.

2 GMC-I Messtechnik GmbH

Meaning of Symbols on the Instrument

!

M111948

EB

8

11

DE MTP 11 B 001 MI-003 Prototype test certificate

Total insulation,
Safety Class II device

Warning concerning a source of danger
(Attention, observe documentation!)

This device may not be disposed of with the trash. Fur­ther information regarding the WEEE mark can be
accessed on the Internet at www.gossenmetrawatt.com
by entering the search term ’WEEE’.

Metrology label with year (M11) and registration
number of the indicated authoring for module D.
Duration of Calibration validity country specific

Label with seal from federally
approved test authority

(for recalibration only)

Tamper-proof sealing

The manufacturer‘s lead seal for calibration protection is
located at the back of the instrument.

Tamper-proof sealing for the terminal cover can be attached
either at the left or right-hand side of the terminal cover.

GMC-I Messtechnik GmbH 3

2 Serial Plate – Terminals

Type designation

U

N

f

N

LED constant

Year of manufacture

Accuracy class

CT: Current transformer transformation ratio

VT: Voltage transformer transformation ratio

Serial number

Pulse outpput

I

MIN

-I

N

(I

MAX

)

External auxiliary

Reverse Action Lock

The values of CT, VT and S on the serial plate can be / are calibrated

Operating

Bus connection

temperature range

voltage

Circuit Symbols

4-L

3-L

2-L

Y

V

U12/U1389:

U1387:

U12/U1381:

4 GMC-I Messtechnik GmbH

Voltage Voltage Voltage

Current Current Current

L3L2L1 N

S0

CurrentCurrentCurrent

Inputs

 2.5 mm

2

with wire end ferrules or

 16 mm

2

without wire end ferrule



 2 x 1.5 mm

2

without wire end ferrule

Voltage:

Current:



2.5 mm

2

with wire end furrule or





2 x 1.5 mm

2

without wire end ferrule

Auxiliary voltage

H

BUS

Enable key

24 V



10%

(Feature H1)

Pulse

output

H

12 3 4 5 6 78 9112021222324

+

–

Tighten screws by hand only! Tightening torque

Note:

Observe the wiring diagram in the terminal cover

Attention:

!

for current terminals (No. 1, 3, 4, 6, 7 and 9) = 2 Nm

for all other terminals (No. 2, 5, 8, 11, 20 to 24) = 0.4 Nm

GMC-I Messtechnik GmbH 5