Function
20
isoRW425_D00052_03_M_XXEN / 02.2017
3.2.5 Malfunction
In addition to the self test described above, several functions in the insulation
monitoring device are continuously checked during operation. If a fault is de-
tected, the device error (Err) will be signalled, the error code E.xx appears on
the display as an identifier for the error type xx and the LEDs ON/AL1/AL2 will
flash.
If the error occurs again after restarting the device or after a reset to factory
settings, then contact Bender Service.
3.2.6 Assignment of the alarm relays K1/K2
The messages device error, insulation fault, insulation impedance fault,
undervoltage/overvoltage fault, device test or device start can be assigned to
the alarm relays via the "out" menu. An insulation fault is indicated by the
messages +R1, -R1, +R2 and -R2. Messages +R1 and +R2 can be assigned to in-
dicate an insulation fault on conductor L1/+ and the messages -R1 and -R2
could indicate an insulation fault on conductor L2/-. If an assignment is not
possible, for example in the event of a symmetrical insulation fault, the mes-
sage corresponding to + and - are shown together.
The message "test" indicates a self test.
The message "S.AL" indicates a so-called "device start with alarm". After con-
necting to the supply voltage and setting the parameter value to "S.AL = on",
the ISOMETER® starts with the insulation measurement value R
F
= 0 and
Z
F
= 0 in Z mode and displays all activated alarms. The alarms will be cleared
only when the measured values are up-to-date and no thresholds are exceed-
ed. In the factory setting "S.AL = off", the ISOMETER® starts without an alarm.
It is recommended that the value set for the "S.AL" parameter is identical for
both relays.
3.2.7 Measuring and response times
The measuring time is the period essential for the detection of the measuring
value. The measuring time is reflected in the operating time t
ae
.
In R mode, the measuring time for the insulation resistance value is mainly de-
termined by the required measuring pulse duration, which depends on the in-
sulation resistance and leakage capacitance of the system to be monitored.
To Next Page
Loading...
Need help?
General
