Safety instructionsSafety instructions
EDS44x_D00201_07_M_XXDE/06.2020
9
12 measuring current transformers can be connected for each EDS44x. Up to 50 EDS44x
can be linked via BS bus (Bender sensor bus, RS-485 interface with BS protocol) and there-
by, up to 600 outgoing circuits can be monitored.
The scanning time for all measuring channels is at least 6 seconds, depending on the pro-
file.
Intended use also implies:
• The observation of all information in the operating manual
• Compliance with test intervals
In order to meet the requirements of applicable standards, customised parameter set-
tings must be made on the equipment in order to adapt it to local equipment and oper-
ating conditions. Please heed the limits of the area of application indicated in the
technical specifications.
Any other use than that described in this manual is regarded as improper.
2.5 Requirements for reliable insulation fault location
The EDS44x has the task of locating the insulation fault downstream of the measuring
current transformer R
Fd
. To do this, it must reliably detect the locating current caused by
the insulation fault. This is only possible under the following conditions:
• One current transformer must be connected to each activated channel.
• The locating current I
L
is within the specific range. See chapter 14, Technical data
• The upstream capacitances
C
Lu
must be at least as high as the downstream capaci-
tances
C
Ld
.
• The system leakage capacitance must not be too high (refer to "Diagrams" on
page 41 )
• The residual current can be within the following range: 100 mA…10 A (EDS440) or
100 mA…1 A (EDS441).
• Along with the amplitude, the frequency of the residual current influences the relia-
ble detection of the locating current. With regard to this, observe the "Fault curve
EDS440" on page 51 and the "Fault curve EDS441" on page 51.
2.6 Periodic verification
The EDS system monitors itself during operation.
We recommend to activate the test function on each connected EDS44x regularly. There
are several ways to start a test:
• Select standard display and then press the "TEST" button on the front panel of the
EDS44x
• Press an external TEST button connected to the EDS44x
• Send a TEST command from an iso685 device via the BS bus.
Observe the applicable national and international standards, which require regular test-
ing of electrical equipment.
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