Function
21
IRDH575_D00089_05_M_XXEN/01.2020
IRDH575 via the RS-485 interface (BMS protocol) and is then indicated by an
alarm LED and indicated on the display. In the Master mode (Addr. 1), this
alarm message is indicated by the alarm relay K3 as common alarm.
During the insulation fault location process the insulation monitoring func-
tion is deactivated. If the test current falls below the value the EDS4… is capa-
ble of measuring, the insulation fault location process will be stopped by
IRDH575.
3.5.4
Interconnected systems
When using ISOMETER®s in IT systems care shall be taken that only one active
ISOMETER® is connected in each interconnected system. If IT systems are
interconnected via coupling switches, make sure that ISOMETER®s not cur-
rently used are disconnected and deactivated via a control system. IT systems
coupled via diodes or capacitances may also influence the insulation monito-
ring process. Hence, also in this case a central control of the different
ISOMETER®s is required.
Risk of malfunctions due to excessive locating current
on sensitive system parts!
An excessive locating current flowing between the IT system
and earth may cause controller faults in sensitive system
parts, such as the PLC or the relay. Ensure that the level of
the locating current is compatible with the system to be
monitored.
CAUTION
Содержание ISOMETER IRDH575
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