UMG 509-PRO
36
www.janitza.com
7.8
Residual current detection
The device:
·Is suitable for use as a residual current monitor
(RCM) for monitoring AC currents and pulsating
DC currents.
·Can measure residual currents according to IEC/
TR 60755 (2008-01)
of type A.
Connection of suitable external residual current
transformers with a nominal current of 30 mA can
be made on residual current transformer inputs I5
(terminals 4/5) and I6 (terminals 6/7).
7.8.1
Failure monitoring
The device monitors the ohmic resistance at the
residual current measurement inputs.
If this is greater than 300 ohms, this indicates a
failure of the residual current measurement. This
can occur, for example, due to a cable break.
For more information on failure monitoring, see
the section „12.7 Failure monitoring (RCM)“ on
page 76.
CAUTION
Risk of injury or damage to the meter/your
system due to short circuit!
Inadequate insulation of the operating equip-
ment at the residual current measuring input with
respect to the supply circuits can cause voltages
at the measuring input which represent a haz-
ard when touched or damage to your device or
system.
·
Ensure reinforced or double insulation with
respect to the supply circuits.
·
Isolate residual current measurement inputs
galvanically from each other and galvanical-
ly from the supply voltage!
L2 L3
N L1
Load
PE
Fig. "Residual current measurement via current transformer"
connection variant
INFORMATION
·The ratios for the residual current transformer
inputs via can be configured using the GridVis
®
power grid monitoring software.
·For the measurement inputs I5 and I6, no con-
nection diagram has to be configured.
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