Function
21
isoEV425_D00126_09_M_XXEN/03.2019
Operating time t
ae
The operating time t
ae
is the time required by the ISOMETER® to determine
the measured value. The insulation resistance measured value depends on
the insulation resistance R
F
and the system leakage capacitance C
e
. High sys-
tem leakage capacitances and system interferences lead to longer operating
times.
Response delay t
on
The response delay t
on
is set uniformly for all messages in the menu "t" using
the parameter "ton". This delay can be used for interference suppression in
the case of short measuring times. An alarm will only be signalled when a
threshold value of the respective measured value is violated for the period of
t
on
without interruption. Every time the threshold value is exceeded within
the time t
on
, the response delay "ton" restarts once again.
Every alarm message listed in the alarm assignment has its own timer for t
on
.
Delay on release t
off
The delay on release t
off
can be set uniformly for all messages in the menu "t"
using the parameter "toff".
An alarm will continuously be signalled until the threshold value of the re-
spective measured value is not exceeded (including hysteresis) for the period
of t
off
without interruption. Each time the threshold value is not exceeded for
the period of t
off
, the delay on release t
off
restarts once again. Every alarm mes-
sage listed in the alarm assignment has its own timer for t
off
.
Start-up delay t
After connection to the supply voltage U
S
the alarm indication is supressed for
the preset time (0…10 s) specified for parameter "t".
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