janitza UMG 512-Pro, User Manual And Technical Data

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UMG 512-PRO
7.6 Current measurement
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 up to 120 A for 1 second.
The factory-set current transformer ratio is 5/5 A
and must be adapted as needed for the current
transformers used.
Fig. Connection example, “Current measurement via
current transformer”.
L1 N PE L3 L2
S
1
S
2
S
1
S
2 S
1
S
2
S
1
S
2
WARNING
Risk of injury due to high currents and high
electrical voltages!
Severe bodily injury or death can result from:
·Touching bare or stripped leads that are ener-
gized.
·Dangerous live current measurement inputs of
the device and at the current transformers.
Therefore, please note for your system:
· Disconnect the supply of power before
starting work!
· Secure it against being switched on!
· Check to be sure it is de-energized!
· Ground and short circuit! Use the ground
connection points with the ground symbol
for grounding!
· Cover or block off adjacent live parts!
WARNING
Risk of injury due to electrical voltage at cur-
rent transformers!
Current transformers which are operated exposed
on the secondary side can carry hazardous live
high voltage peaks which can lead to serious
bodily injury or death.
Therefore please abide by the following:
· Switch off your installation before com-
mencing work! Secure it against being
switched on! Check to be sure it is de-en-
ergized! Ground and short circuit! Cover or
block off adjacent live parts!
· Avoid exposed operation of the current
transformers.
· Short-circuit unloaded current transformers.
· Before interrupting the current supply, short
circuit the secondary connections of the
current transformers.
· If there is a test switch which automatically
short-circuits the secondary current trans-
former lines, it is sufficient to set it to the
“Test” position, provided that the short-cir-
cuiters have been checked beforehand.
· Only use current transformers with basic
insulation according to IEC 61010-1:2010.
· Fix the attached screw terminal to the de-
vice with the two screws.
· Even current transformers rated as safe for
exposed operation are dangerous to touch if
they are operated exposed.
WARNING
Risk of injury or damage to the device due to
electrical voltage and improper connection!
High measuring currents can cause temperatures
of up to 80 °C (176 °F) at the connections.
Use wiring designed for an operating tempera-
ture of up to 80 °C (176 °F)!