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Connecting accessories
12.8 Installation Utility Meter / Janitza UMG 104 (only Solar-Log 1000 and
2000)
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 the voltage measurements are needed to control voltage-dependent reactive power via the Q(U)
function (Although, it is still recommended to perform voltage and current measurements to check that
the reduction function is operating properly). Current and voltage measurements are needed for the other
functions.
The previous chapter explains how to wire the Utility Meter to the Solar-Log™. This chapter deals with con-
necting the Utility Meter for measurements in low- and medium-voltage power grids.
Utility Meter supply voltage / Janitza UMG 104:
•
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) are 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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