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Functional description
The electronical three phase measurement
system determines and digitalizes the effective
values of voltages and currents in 50/60 Hz net-
works.
The operating voltage for operation of UMG96L
is generated by the measuring voltage L1-N. A
random test measurement is carried out each
second at all current and voltage inputs. Meas-
uring signal interruptions, which last longer than
one second are safely recognized.
For each random test one period is scanned.
From those sampled values the microproces-
sor calculates the electric quantities. These
measured values are indicated within the pro-
grammable display. The energy as well as the
minimum and maximum values are stored
every 15 minutes whereas the programmed
data are stored immedately is a none volatile
memory (EEPROM).
The scanning frequency for all measuring in-
puts is calculated from the net frequency of
phase 1. At a net frequency of 50Hz the scan-
ning frequency is 2,5kHz and for 60Hz it is
3,0kHz.
Diagr. Generation of the operating voltage from
measurement voltage.
Product description
Intended use
The UMG96L is suitable for fix mounting and
the measurement of voltage, current, power
etc. in low voltage switchgear. The measure-
ment is designed for 3 phase systems with neu-
tral conductor (TN and TT-mains).
The UMG96L is suitable for mounting in fix and
weather protected panels. Conducting panels
must be earthed.
Due to the high resistance against interference,
the UMG 96L is suitable for continous and un-
supervised operation.
As the UMG96L receives its power from phase
L1 of the measuring voltage, at least phase L1
and the neutral conductor N must be con-
nected.
The attached voltage must be within the range
of the measuring and operation voltage shown
on type plate.
Either ../5A or ../1A current transformers can be
connected to the current measuring inputs.
The connection of the measuring and operat-
ing voltage is carried out on the back side of
the UMG96L via all-insulated spring power
clamps.
The measuring and operating voltages must be
connected to the UMG 96L via a separation
(switch or power switch) and an overcurrent
protection fuse (2-10A) in the building installa-
tion. The separation (switch or power switch)
must be near the UMG 96L and easily accessi-
ble.
UMG96L
Generation of oper-
ating voltage
L2
L3
N
L1
PE
Voltage measurement
3M
3M
3M
