9
TGH1394en/05.2007
2. Safety instructions
2.1 Intended use
EDS... insulation fault location systems have been designed to monitor
unearthed DC, AC and three-phase power supply systems (IT systems)
for insulation faults. Alternating and three-phase systems in the range of
AC 24 to 690 V and DC systems in the range of DC 24 to 500 V can be
monitored. The operating frequency is optionally DC, 50, 60 or 400 Hz.
The nominal system voltage varies with the type of insulation fault test
device used (PGH47., IRDH575).
An EDS system consists of the insulation fault evaluators EDS460/490 or
EDS461/491 and either the A-ISOMETER® IRDH575 or insulation fault
test device PGH. Using measuring current transformers EDS460/490 or
EDS461/491 insulation fault evaluators detect test current signals gener-
ated by the RDH575 insulation monitoring device or PGH... insulation
fault test device and evaluate them.
If the test current is too high, IRDH575 or PGH... may dam-
age sensitive loads (e.g. in control circuits) or may acci-
dentally activate switching operations. Therefore, it is
recommended to use a PGH... with a low test current or to
set a low test current at the IRDH575. The response sensi-
tivity of EDS461/491 insulation fault evaluators is higher
and hence they are capable of evaluating this low test
current.
In case of doubt, please contact a BENDER product man-
ager.
Caution
To Next Page
Loading...