janitza UMG 806, User Manual And Technical Data

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UMG 806 www.janitza.com
7.5 Current measurement
The device:
· Measures current exclusively via current trans-
formers.
· Does not measure DC currents.
· Permits the connection of current transformers
with a transformer ratio of ../1 A and ../5 A for
current measurement inputs I1 to I4 (terminals
11-18).
· Has a current transformer ratio of 5/5A (I1 to I4)
as the default setting.
· Permits a residual current measurement via cur-
rent measurement input I5 (terminals 9/10)
The current transformers require a basic insulation
according to IEC 61010-1:2010 for the nominal
voltage of the circuit.
Fig. Connection example for “current measurement”.
L1
N
PE
L3
L2
Load
S1
S1
S1
S1
ATTENTION
Material damage due to disregard of the con-
nection instructions during current measure-
ment.
Failure to comply with the connection requirements
of your device can result in the permissible current
measurement range being exceeded. This can lead
to damage or destruction of or fi re in your device or
system and thus to material damage!
·
Use current transformers for current mea-
surement! The device only allows current
measurement via current transformers!
·
Observe the connection conditions for the
current measurement inputs of your device
and the current transformers!
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 start-
ing 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 current
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 commenc-
ing work! Secure it against being switched
on! Check to be sure it is de-energized!
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 cur-
rent transformers.
· If there is a test switch which automatically
short-circuits the secondary current trans-
former lines, it is suffi cient 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.
· 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)!