UMG 96-PA
/ UMG 96-PA
MID
www.janitza.com
22
7.5 Current measurement
The device:
·is designed for the connection of current
transformers with secondary currents of ../1 A
and ../5 A.
·is only approved for a current measurement
using the current transformer.
·does not measure DC currents.
The default current transformer ratio is set
to 5/5 A and may need to be adjusted to the
current transformer used.
WARNING
Risk of injury due to electric voltage on
current transformers!
High voltage spikes that are dangerous to
touch can arise on current transformers that are
operated open on the secondary side, which
can result in serious injuries or even death.
Therefore, please observe the following:
·
Before starting work, disconnect your
system from the power supply! Verify that
there is no current!
·
Avoid open operation of the current
transformer.
·
Short-circuit the unloaded current
transformer.
·
Before interrupting the power supply, it
is critical to short circuit the secondary
connections of the current transformer.
·
If a test switch is present that automatically
short circuits the secondary lines of the
current transformer, it is sufficient to
put it in the “test” position provided that
the short-circuiters have been checked
beforehand.
·
Only use current transformers that have
a basic insulation according to
IEC 61010-1:2010.
·
Fasten the attached screw-type terminal to
the device with the two screws.
·
Even safe open current transformers are
dangerous to touch if they are operated open.
·
Observe the documentation for the current
transformers!
WARNING
Risk of injury due to electric voltage!
During high measured currents, temperatures
up to 80 °C can arise at the connections.
Use lines which are designed for an operat-
ing temperature of at least 80 °C.
WARNING
Risk of injury due to electric voltage!
Serious personal injuries or death can occur
due to:
·Touching live exposed or stripped cores.
·Device inputs that are dangerous to touch.
De-energize your system before beginning
to work! Check that there is no voltage!
Ground the system!
Use the ground connection point with the
ground symbol for this.
NOTE
You can easily configure the
current
transformer ratios
via
·the device menu (Configuration >
Measurement > Measurement).
·the GridVis
®
software.
Fig.
Example of “Current measurement vFa current
transformer” connectFon
L2
L3
N
L1
S1 S2
S1 S2
S1 S2
Load
