janitza UMG 509, Operation Manual And Technical Data

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31
UMG 509
Direct measurement
You can use the UMG 509 to measure currents up to 5A
directly without current transformers.
In this case, it must be taken into consideration that
the direct measurement of the current can only be
performed in three-phase 4-conductor systems with
nominal network voltages up to
• 127V/220V (300V CAT III) according to UL
• 277V/480V (300V CAT III)
and three-phase 3-conductor systems with nominal
network voltages up to
• 277V (300V CAT III) according to UL
• 480V (300V CAT III).
Since the UMG 509 does not feature any integrated
protection for the current measurement, this protection
must be provided in the installation.
UMG
S
2
I
S
1
Einspeisung
Supply
Verbraucher
Consumer
5A Typ C
Ammeter
If you wish to measure the current not only with
the UMG 509 but rather with an ammeter too, the
ammeter must be connected to the UMG 509 in series.
UMG
S
2
I
S
1
Einspeisung
Supply Verbraucher
Consumer
A
(k)S
1
S
2
(l)
P
2
(L) (K)P
1