janitza UMG 96-S2, User Manual And Technical Data

Page: 42 / 66

UMG 96-S2 www.janitza.com
42
13. Commissioning
13.1 Connecting the supply voltage
·The supply voltage level for the device can
be found on the rating plate or in chap. „18.
Technical data“ on page 58.
·After connecting the supply voltage, the first
measured value display appears on the device.
·If no display appears, check whether the supply
voltage is within the rated voltage range.
13.2 Connecting the measured voltage
·Connect voltages in networks with rated
voltages above 300 VAC to ground via a voltage
transformer.
·Note that the measured voltages of all phases
(L-N and L-L) displayed by the device are in
realistic ranges in comparison to the actual
measured voltages present. In the event of
large deviations, check e.g. the set transformer
ratios.
WARNING
High voltages and currents!
The rated voltages above 300 VAC to ground
present on the device can lead to personal
injuries and destroy the device.
·
Connect voltages in networks with rated
voltages above 300 VAC to ground via
a voltage transformer.
·
Do not exceed the threshold values
specified in the user manual and on the
rating plate! This must also be observed
during inspections and commissioning.
13.3 Connecting the measured current
The device permits
·the connection of ../1 A and ../5 A current
transformers.
·only the measurement of alternating currents
via the current measurement inputs (no DC
currents!).
When connecting the measured current, note
that
·all current transformer outputs except for one
are short circuited.
·the currents displayed by the device are in
realistic ranges in comparison to the currents
actually present. The current displayed by the
device must correspond to the current input,
taking in consideration the current transformer
ratio.
·the device displays approx. 0 amperes in the
short circuited current measurement inputs.
·if necessary, adjust the current transformer
ratio to the current transformer used (standard
setting: 5/5 A).
NOTE
The device is only suitable for the measurement
of alternating voltages and currents! Do not
connect DC currents!
13.4 Checking the phase sequence
Check the direction of the rotating field voltage
in the measured value display of the device.
Normally a “right” rotation field exists (for
additional information, see chap.„12.8.4 Phase
sequence“ on page 41).
13.5 Checking the phase assignment
The assignment of the phase conductor (phase)
to the current transformer is correct if a current
transformer is short circuited on the secondary
side and the current displayed by the device in
the associated phase conductor drops to 0 A.
13.6 Checking the power measurement
1. Short circuit all current transformer outputs
except for one and check the powers
displayed.
2. The device may only display a power in the
phase conductor (phase) with the not short
circuited current transformer output.
3. If this does not hold true, check the
connections of the measured voltage and the
measured current.
If the value of the measured active power is
correct, but the sign is negative, this can have 2
causes:
1. Reversed connections S1(k) and S2(l) on the
current transformer or
2. Active energy is delivered back into the
network.
13.7 Checking the measurement
Correctly connected voltage and current
measurement inputs produce correctly
calculated and displayed individual and sum
powers.