Gossen MetraWatt MID U1281 User manual

Operating Instructions
3-349-618-15
3/12.18
MAIN PISTRIBUTION – PRODUCTION
ENERGYMETER|MID
Electronic Active Energy Meters
U1281/U1289/U1381/U1387/U1389
GMC-I Messtechnik GmbH
Südwestpark 15
90449 Nürnberg • Germany
Phone [phone]
Fax [phone]
E-Mail [e-mail]
www.gossenmetrawatt.com
Edited in Germany • Subject to change without notice • A pdf version is available on the Internet

2 GMC-I Messtechnik GmbH
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.

GMC-I Messtechnik GmbH 3
Meaning of Symbols on the Instrument
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. Fur-
ther 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.
!
M111948
EB
8
11

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2 Serial Plate – Terminals
Type designation
UNfN
LED constant
Year of manufacture
Accuracy class
CT: Current transformer transformation ratio
VT: Voltage transformer transformation ratio
Serial number
Pulse outpput
IMIN-IN(IMAX)
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:

GMC-I Messtechnik GmbH 5
Voltage Voltage Voltage
Current Current Current
L3L2L1 N
S0
CurrentCurrentCurrent
Inputs
2.5 mm2 with wire end ferrules or
16 mm2 without wire end ferrule

2 x 1.5 mm2 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

6 GMC-I Messtechnik GmbH
3 Pulse Output – Bus Interfaces
underligned values are default values in as-delivered condition
The interface descriptions for the active energy meters are
available on the Internet under www.gossenmetrawatt.com.
Pulse rates fix V1/V3 V7 V8 fix V9 Programmable V2/V4
Direct
U1281 / U1289
1000puls./kWh 100 — — 1 1000 pulses/kWh
Transformer U1381 / U1387 / U1389
f (secondary)
CT = VT = 1 (Q0) 1000
puls./kWh 100 1000 100

10000
1  1000  10000puls./kWh
CT, VT progr. (Q1) 1000 puls./kWh 100 1000 1  1000  10000 puls./kWh
CTxVT; CT, VT fix (Q9) f (primary) f (primary)
1 10
1000puls./kWh —11000 pulses/kWh
11 100
100 pulses/kWh —0,1100 pulses/kWh
101 1000
10 pulses/kWh —0,0110 pulses/kWh
1001 10000
1 pulses/kWh —11000 pulses/MWh
10001  100000 0,1 pulses/kWh —0,1100 pulses/MWh
100001  1000000 0,01 puls./kWh — 0,01 10 pulses/MWh
R
L
+
20
21
U
t
External Voltage Source
Energy Import
max. 40 V
RL
20
21
U
t
AC/DC
Energy Import
max. 375 V
~
24 V DC
I = max. 100 mA
I = max. 27 mA
U U
External Voltage Source
Standard pulse duration: 30 ms + 5%, Interpulse period: > 30 ms
Pulse duration V7/V8: 130 ms + 5%, Interpulse period: > 130 ms

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4 Display and Control Panel
4.1 Test LED
The test LED is located between the LCD and the serial
plate. The higher the measured power value, the higher the
blink rate. If all currents are lower than the starting current,
the LED lights up permanently.
LED Constant
U128x: 10 000 pulses/kWh
U138x: 100 000 pulses/kWh
4.2 Resolution of Energy Import Main Display (Large Characters)
*
For calibratable main displays (Q0 or Q9), the calibration reading
indicates an additional digit after the decimal point. Therefore,
the leading digit is omitted in the case of 7-digit presentation.
Meter
Feature
CTxVT
min.
CTxVT
max.
Standard
Reading
Calibration
Reading *
Unit
U1281, U1289 — — 123456.7 23456.78 kWh
U138x
Q0 or Q9 1 10 12345.67 2345.678 kWh
Q9
11 100 123456.7 23456.78 kWh
101 1000 1234567 234567.8 kWh
1001 10000 12345.67 2345.678 MWh
10001 100000 123456.7 23456.78 MWh
100001 1000000 1234567 234567.8 MWh
Q1
1 10 123456.7 kWh
11 100 1234567 kWh
101 1000 12345.67 MWh
1001 10000 123456.7 MWh
10001 100000 1234567 MWh

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4.3 Meanings of Symbols on the LCD
U
Main display is not/cannot be calibrated,
if
U is displayed.
Correct connection:
Continously lit phase symbols
Phase failure:
Symbol for affected phase is cleared from display.
Incorrect phase sequence:
Phase symbols blink in the following order: 3-2-1.
Negative power:
Respective phase symbol blinks.
4 quadrant display of instantaneous power: posi-
tive or negative active power P, positive or nega-
tive reactive power Q.
For bus connection: appears when the
meter transmits a data packet.
Main display (active energy Etot* in kWh or MWh)
Auxiliary display (instantaneous power Pmom*)
Error: alternating error code and instantaneous power
* U138x: CT and VT are taken into consideration

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Key Symbols for Parameters Configuration
Key and 2nd key bit blanked:
Parameters CT, VT or S0 configurable according to fea-
tures, can be disabled with enable key.
Key displayed with one key bit:
Parameters CT, VT or S0 disabled,
can be changed after activating enable key.
Key blanked, 2nd key bit displayed:
Parameters CT, VT or S0 (which are / can be calibrated)
are preset at the factory, can be queried in the display
mode, other values can be set.
Key with 2nd key bit displayed: parameters (which can be /
are calibrated) are preset at the factory, other values are
disabled with enable key and can be reset after cancel-
ling the disable function.
Values which are preset at the factory are specified addi-
tionally on the serial plate in as-delivered condition.
Symbols Adjustable
parameters
Disabled
parameters
Fixed/
calibrated
parameters
Feature
CT, VT Q1
S0 V2, V4
CT, VT Q1
S0 V2, V4
CT, VT S0
Q1 and V1/V3/V7/V8/V9
S0 CT, VT V2/V4 and Q0/Q9
CT, VT S0 Q1 and V1/V3/V7/V8/V9
S0 CT, VT V2/V4 and Q0/Q9
S0, CT, VT V1/V3 and Q0/Q9
S0, CT, VT V7/V8/V9 and Q0

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4.4 Key Operation
Querying parameter values CT, VT and S0
Apart from the LCD test, the menu key located between
LCD and serial plate serves to query current paramter val-
ues and, in the case of active energy meters with special
features, to change parameters (provided that the enable
key has been activated before). The sequence can be seen
from the figure on the right.
If no key is pressed for 2 minutes, the display returns auto-
matically to the standard setting.
Parameters can be changed in the following instruments:
Parameters CT, VT for U138x with feature Q1,
parameters S0 for U128x/U138x with feature V2/V4
a) Enabling parameter modifications
The enable key serves to enable or disable paramter
changes. It is located below the terminal cover and is acti-
vated with a pointed object (e. g. ballpen).
Pressing the key for the first time activates operating mode
„Change parameters“ (key off):
Renewed activation disables operating mode „Change
parameters“ (key on):
If the key is not activated for approx. 2 minutes, operating
mode „Change parameters“ is automatically aborted and
blocked.
The key is displayed again:


