DOLD VARIMETER IMD RL 5898 Tecnica di monitoraggio - Pagina 6
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Notes
Risk of electrocution!
Danger to life or risk of serious injuries.
WARNING
• Disconnect the system and device from the power supply and ensure
they remain disconnected during electrical installation.
• The display of the voltage is not in real time. The Value on the display is
updated at the end of a measuring cycle. Determine voltage free status
by using appropriate instruments!
• The terminals of the control input X1 - X2 have no galvanic separation to
the measuring circuit L(+) - L(-) and are electrically connected together,
therefore they have to be controlled by volt free contacts or bridge. These
contacts ore bridges must provide a sufficient separation depending on
the mains voltage on L(+) - L(-).
• Please do not connect external voltage to terminals X1/X2. The control
must only be made by bridging X1 and X2.
• The coupling unit RL 5898 or RP 5898 must only be used in conjunction
with the RP5897/010 on a voltage system and not just by itself.
!
Attention!
• Before checking insulation and voltage, disconnect the monitoring device
RN 5897 from the power source!
• In one voltage system only one insulation monitor can be used. This has
to be observed when interconnecting two separate systems..
• Device terminals PE1 and PE2 must always be connected via separate
lines to different terminal points of the protective-conductor system.
• The device must not be operated without PE1/PE2 connection!
Attention!
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• The main measuring circuit can be connected with its terminals L(+) and
L(-) both to the DC and also AC side of a mixed network; it is done most
practically where the primary incoming power supply takes place e.g.
with battery networks with connected inverters on the DC side, with
Generators/Transformers with connected Rectifiers or inverters on the
AC-side. To monitor a 3NAC system the device can be connected single
pole, (L(+) and L(-) are bridged, to the neutral of the 3p4w system. The 3
phases have a low-ohmic (approx. 3 – 5 Ω) connection via the transformer
windings so also insulation failures of the not directly connected phases
are detected. Via the display menu in programming mode the correct
type of network needs to be selected (see „Connection Examples").
• If a monitored AC system includes galvanically connected DC circuits
(e.g. via a rectifier), an insulation failure on the DC side can only
be detected correctly, when a current of > 10 mA can flow via the
semiconductor connections.
• If a monitored DC system includes galvanically connected AC circuits
(e.g. via an inverter), an insulation failure on the AC side can only
be detected correctly, when a current of > 10 mA can flow via the
semiconductor connections.
• The measuring circuit of the RN 5897/010 are designed for leakage
capacities up to 1000 µF. The measurement of the insulation resistance
will not be influenced but for the measuring phases longer time periods
are necessary as with smaller capacities. If the max. possible leakage
capacity is known, the device can be adjusted to the required lower
level, which will reduce the response time and measurement time.
• The trigger output Y1/Y2 at RN 5897/010 is galvanic separated from the
rest of the circuit. It determined to be connected to a DOLD insulation
fault location system RR5886 and RR5887. Please do not connect
external voltages.
6
07.07.23 en / 755A