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Janitza UMG 104 (Utility Meter)
Janitza UMG 104
7 Janitza UMG 104 (Utility Meter)
7.1 Janitza UMG 104
The Solar-Log™ Utility Meter is a universal metering device. It can be integrated in both low- and medium-
voltage networks (via a transformer) and is needed for various functions:
•
controlling voltage-dependent reactive power via the Q(U) function
•
controlling reactive power at the feeding point
•
recording the measurement data needed for the response signals sent to the grid operator
Only voltage measurements are required for voltage-dependent reactive power reduction Q(U). However,
we still recommend using both current and voltage measurements to be able to check that the reduction
function is operating properly. Current and voltage measurements are needed for the other functions.
Utility Meter supply voltage:
•
95-240Vac, 45-65Hz or 135-340Vdc
The Utility Meter's measuring inputs have the following limits:
•
Voltage line conductor AC (without a voltage transformer): 10…300 V AC
•
Voltage phase AC (without a voltage transformer): 17…520 V AC
•
Current (without a current transformer) 0.005, 7.5 A
•
Frequency of the fundamental component: 45 ..65 Hz
The limit may not be exceeded. For this reason, a measuring transformer needs to be installed for most
applications.
We recommend the following transformer ratio:
•
Voltage: Secondary 100V
e.g. at 20kV grid converter 20000:100V
•
Current: Secondary 5A
e.g. 100:5A
Note
The Utility Meter that we use is produced by the company Janitza.
Refer to the Janitza UMG 104 manual for further technical details.
We cannot guarantee the functionality of other Janitza devices.
► The operating modes Utility Meter (U / U+I) is only possible with the Solar-Log 1000 and
2000.
Note
The Utility Meter cannot be connected to the inverters with a single bus.
For this reason, use one RS485 connection for the inverters and one RS485 connection for the
Utility Meter.
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