History Memory; Self Test - Bender ISOMETER iso1685DP-425 Manual

Activation or deactivation is done via
• a digital input
• the menu item Alarm settings
• the BMS bus and Modbus RTU
The standby mode of the ISOMETER®, for example, enables application in coupled systems,
since in interconnected systems only one insulation monitoring device may be connected.
3.3.5 Measured value transmission
All recorded measured values, operating messages and alarms are made available via the BMS
bus or Modbus RTU.

3.4 History memory

All warnings, alarms and device errors are stored in the internal history memory with date and
time stamp. The time the event started, the time of acknowledgement and the end of the
event are recorded. The history memory can be called up and reset via the device menu
"History" on page

3.5 Self test

3.5.1 Self test after connection to the supply voltage
Once connected to the supply voltage, all internal measurement functions, the components
of the process control such as data and parameter memory as well as the connections to earth
are checked. The self test is completed after approx. 60 s. Afterwards, the normal measure-
ment mode begins.
If a device error or a connection fault is detected, the corresponding alarm will be indicated in
the display as well as via the alarm relay K3 (31-32-34). This relay operates continuously in NC
operation, i.e. a device error is signalled even in case of a complete device failure.
During this self test, when the device is being started, the alarm relays are not switched.
TEST
Measurement
√
Coupling
Earth connec-
tion
33 %
16
62).
Test successful
Test not successful
Test not available
(e.g. incorrect device settings).
Test in progress
isoxx1685Dx-x25_D00272_07_M_XXEN/09.2022
Function
(see