UMG 509-PRO
102
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15.3 Residual current detection
Residual current measurement (RCM)
Nominal current
30 mArms
Measuring range
0 .. 40 mArms
Operating current
100 µA
Resolution
1 µA
Crest factor
1.414 (relative to 40 mA)
Load
4 ohms
Overload for 1 s
5 A
Constant overloaded
1 A
Overload 20 ms
50 A
Measurement of residual currents
according to IEC/TR 60755 (2008-01), Type A
Maximum external load
300 ohms (for cable break detection)
Connection capacity of the terminal points (residual current measurement)
Connectible conductors. Only one conductor may be connected per terminal point!
Rigid/flexible
0.14 - 1.5 mm
2
, AWG 28-16
Flexible with wire ferrules without plastic
sleeve
0.20 - 1.5 mm
2
Flexible with wire ferrules with plastic
sleeve
0.20 - 1.5 mm
2
Strip length
7 mm
Tightening torque
0.20 - 0.25 Nm
Cable length
up to 30 m not shielded; greater than 30 m
shielded
Potential isolation and electrical safety of the residual current measurement inputs
·The RCM measurement inputs are double insulated relative to the current and voltage mea-
surement inputs as well as to the supply voltage.
·There is no insulation relative to the temperature measurement input.
·There is only a functional insulation relative to the Ethernet, Profibus, RS-485 and digital I/O
interfaces.
·The connected residual current transformers and the wires to be measured must each have
at least an additional or basic insulation in accordance with IEC61010-1:2010 for the mains
voltage applied.
