UMG 96-PA / UMG 96-PA-MID / UMG 96-PA-MID+
www.janitza.de
26
7.5 Current measurement
The device:
·Is designed for the connection of current trans-
formers with secondary currents of ../1 A and
../5 A.
·Is only approved for current measurement via
current transformers.
·Does not measure DC currents.
The factory-set current transformer ratio is 5/5 A
and must be adapted to the current transformers
used as needed.
WARNING
Risk of injury due to electrical voltage at cur-
rent transformers!
Current transformers which are operated
exposed on the secondary side can carry haz-
ardous 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! Check to be sure it is de-en-
ergized!
·
Avoid exposed operation of the current
transformers.
·
Short circuit unloaded current transformers.
·
Before interrupting the supply of power, it
is essential to short the secondary connec-
tions 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.
·
Observe the documentation for the current
transformers!
WARNING
Risk of injury due to electrical voltage!
At high measuring currents, temperatures of up to
80 °C can occur at the connections.
Use cables that are designed for an operating
temperature of at least 80 °C.
WARNING
Risk of injury due to electrical voltage!
Severe bodily injury or death can result from:
·Touching bare or stripped leads that are ener-
gized.
·Device inputs that pose a hazard when
touched.
Disconnect your system from the power
supply before starting work! Check to be sure
there is no voltage! Ground the system!
Use the ground connection points with the
ground symbol to do so!
Fig.
Connection example, "Current measurement via current
transformer".
L2
L3
N
L1
S1 S2
S1 S2
S1 S2
Load
NOTE
The device only allows the setting of
one current
transformer ratio
for
all phases!
You can configure
current transformer ratios
conveniently via
·The device menu.
·The GridVis
®
software.
For information on current transformer configu-
