Function
22
isoRW425_D00052_03_M_XXEN / 02.2017
An alarm will continuously be signalled until the threshold value of the re-
spective measuring value is not violated (including hysteresis) for the period
of t
off
without interruption. Each time the threshold value is not violated for
the period of t
off
, the delay-on release t
off
restarts once again.
Every alarm message 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 for the preset
time (0…10 s) in the parameter "t" is suppressed.
3.2.8 Password protection (on, OFF)
If password protection has been activated (on), settings can only be made
subject to the correct password being entered (0...999).
3.2.9 Factory setting FAC
Activating the factory setting will reset all modified settings, with the excep-
tion of the interface parameters, to the default upon delivery.
3.2.10 External, combined test or reset button T/R
Reset= Press the external button < 1.5 s
Test= Press the external button > 1.5 s
Stop measuring function = Press and hold the external button
The stop function can also be triggered by an interface command and in this
case it can only be reset via the interface.
Only one ISOMETER® may be controlled via a test/reset button.
A galvanic parallel connection of several test or reset inputs for testing
multiple insulation monitoring devices is not allowed.
3.2.11 Fault memory
The fault memory can be activated or deactivated with the parameter "M" in
the menu "out". When the fault memory is activated, all pending alarm mes-
sages of the LEDs and relays remain available until they are deleted by using
the reset button (internal/external) or the supply voltage U
s
is turned off.
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