janitza UMG 96S 24V, Руководство по эксплуатации

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Page 27
Checking the individual power outputs
If a current transformer is assigned to the
wrong phase conductor, the corresponding
power output will also be incorrectly measured
and displayed.
Assignment of the phase conductor to the cur-
rent transformer at the UMG96S is correct if
there is no voltage between the phase conduc-
tor and the corresponding current transformer
(primary).
The respective current transformers can be
short-circuited on the secondary side to ensure
a current conductor at the voltage measure-
ment input is assigned to the correct current
transformer. The apparent power displayed by
the UMG96S must then be zero in this phase.
If the apparent power is correctly displayed but
the active power is displayed with a “-” sign, the
current transformer terminals are reversed or
power is supplied to the power supply company.
Checking the summation power outputs
If all voltages, currents and power outputs are
correctly displayed for the respective phase
conductor, the summation power outputs meas-
ured by the UMG96S must also be correct. To
confirm this, the summation power outputs
measured by the UMG96S must be compared
with the work of the active power and reactive
power meters located in the incoming supply.
Checking the current direction
Short-circuit two current transformers on the
secondary side. The active power displayed in
the remaining phase of the UMG96S must now:
be positive (+) when active power is imported
and
be negative (-) when active power is supplied
(generator mode).
If no active power is displayed, the assignment
of the voltages to the currents may be incorrect.