ISOSCAN® EDS440 and EDS441
9.2.2.2 Operating mode of the relays
The relay mode can be adapted to the application:
• n/c Normally closed - n/c operation of contacts 13-14 / 23-24
(The alarm relay is energised in normal operation.)
• n/o Normally opened - n/o operation of contacts 13-14 / 23-24
(The alarm relay is de-energised in normal operation.)
9.2.2.3 Digital current output (M+)
Figure 9-3: Connection example of the digital output
The digital current output is located at M+ of the X1 plug.
If a function is assigned and active, the digital current output drives 20 mA. Otherwise no current is driven.
9.2.2.4 Functional description
Up to three functions can be assigned to one output. The functions are linked via an OR operator:
Function 1
Function 2
Function 3
Response
≥1
Possible output funcions
off The function is not used.
I
ΔL
Output status changes if an insulation fault is detected on one of the measuring channels.
(EDS function)
I
Δn
Output status changes if the residual current is exceeded. (RCM function)
Device error Output status changes in the event of an internal device error.
Connection fault Output status changes when one of the following measuring current transformer
connection faults occurs:
•
Measuring current transformers defective
•
Power supply cable interrupted
•
Power supply cable short-circuited
EDS44x_D00201_10_M_XXEN/11.2023 53
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