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UMG 103
Product Description
Intended use
The UMG103 is intended to be used for the measurement and calculation of
electrical variables such as voltage, current, power, work, harmonic components,
etc. in building installations, at distribution boards, circuit-breakers and busbar
trunking systems.
The UMG103 is permanently installed in control cabinets or small distribution
boards. It can be installed in any position. The measurement results can be read
out via the RS485 interface.
The UMG103 draws its power supply voltage from the measuring-circuit voltage.
The UMG103 is designed for operation in low-voltage distribution systems, in which
overvoltage category III (300 V) impulse voltages can occur.
The UMG103 can measure L-N voltages of up to 240 V and short-term overvoltages
up to 300 Vrms.
The current measurement inputs of the UMG103 are connected via external ../1A
or ../5A current transformers.
The UMG103 is only conditionally suitable for measurements in medium and
high-voltage distribution systems, as it draws the power supply voltage from the
measuring-circuit voltage and therefore loads the voltage transformer with a non-
linear current. Special safety provisions are to be applied to the measurements in
medium and high-voltage distribution systems, which are not dealt with here.
The UMG103 fulfils the test requirements for use in industrial areas.
The UMG103 bridges power failures of max 80 ms with a mains voltage of
230 V AC.
The UMG103 saves all min-, max-, energy values as well as runtime counters in a
non-volatile memory approximately every 5 minutes.
The refresh time of the measured values depends on the set net frequency (at 50Hz:
200ms; at 60Hz: 167ms).
