Operation
54
EDS460-490_D00085_01_M_XXEN/02.2016
5.CT monitor
Enable or disable monitoring of the measuring current transformers.
ON
Measuring current transformers are monitored.
Open circuit, short circuit or missing measuring current transformers
generate an alarm message. The "ALARM 1" LED lights up.
OFF Measuring current transformers are not monitored.
6.Inverter (EDS460/490 only)
Inverters are a major source of interference for the monitored system.
ON Channel is optimised for inverters. Insulation fault location takes
longer in this sub-circuit.
OFF Channel is not optimised for inverters. Insulation faults cannot be re-
liably detected in circuits containing inverters.
7.Alarm I(d)
If the residual current exceeds > 10 A (EDS460/490) resp. > 1A (EDS461/491),
an alarm message is displayed (Alarm 1). This alarm message can be deactiva-
ted.
ON Alarm when the residual current response value is exceeded.
OFF No alarm when the residual current response value is exceeded (for
specific applications only).
8.Relay mode (EDS490/491 only)
The EDS490-D/-L resp. the EDS491-D/-L has an alarm relay for each measuring
channel. Set the relay mode of operation for each relay.
N/O-T
N/O operation. Relay switches in the event of an alarm or a test.
N/C-T N/C operation. Relay switches in the event of an alarm or a test.
N/O N/O operation. Relay only switches in the event of an alarm.
N/C N/C operation. Relay only switches in the event of an alarm.
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