UMG 509-PRO
74
www.janitza.com
12.5 Measured current
The device:
·Is designed for the connection of current trans-
formers with secondary currents of ../1 A and ../5
A.
·Does not measure DC currents.
·Has current measurement inputs which can be
loaded at 120 A for 1 second.
The factory-set current transformer ratio is 5/5 A
and must be adapted to the current transformers
used as needed.
Proceed as follows when connecting the mea-
sured current:
1.Short-circuit all current transformer outputs
except one.
2.Connect the measured current via the terminal
on the back of the device and secure it suffi-
ciently with the two screws.
3.Compare the current displayed on the device
with the applied input current.
·The currents must match, taking into account
the current transformer ratio.
·In the short-circuited current measurement
inputs, the device must indicate approx. zero
amperes.
Sign of phase shift angle (U/I):
·Positive (+) with capacitive load
·Negative (-) with inductive load
Fig. Phasor diagram
Current (displayed with a short
phasor)
Voltage (displayed with a long
phasor)
WARNING
Material damage due to disregard of the con-
nection instructions!
Voltages and currents outside the permissible
measuring range can destroy the device.
Comply with the measuring range specifica-
tions from the technical data.
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