Deactivating The Device; Measured Value Transmission; History Memory; Self Test - Bender ISOMETER isoHR1685DW-925 Manual

Function

3.3.3 Deactivating the device

If the device is deactivated, it does not measure the insulation resistance, the message
Device inactive appears on the display. The IT system is NOT being monitored!
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 sys-
tems, since in interconnected systems only one insulation monitoring device may be
connected.

3.3.4 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 (see "History" on page 26).

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 compo-
nents of the process control such as data and parameter memory as well as the connec-
tions to the system or lifting arm and to earth are checked. The self test is completed after
approx. 60 s. Afterwards, the normal measurement mode begins.
If a device error or a connection fault is detected, the corresponding alarm will be indicat-
ed in the display as well as via the alarm relay K3 (31-32-34). This relay operates continu-
ously in N/C operation, i.e. a device error is signalled even in case of a complete device
failure.
10
Function
During this self test, when the device is being started, the alarm relays are not switched.
TEST
Measurement
√
technology
Coupling
Connection
33 %

3.5.2 Automatic self test

All supply voltages are continuously monitored. The following tests are continuously car-
ried out in the background:
• Connection E-KE
• Temperature monitoring of the coupling
A self test is automatically run at 24-hour intervals.
During the automatic self test, the alarm relays K1 (11-12-14) and K2 (21-22-24) are not
switched. K3 will not be switched either.

3.5.3 Manual self test

The self test is started via the test button of the ISOMETER®.
The following tests are only carried out in the manual self test mode:
• Internal Flash
• CPU register
• Watchdogs
• Oscillator
• Restart of the device including re-initialisation and recalibration
• Connection monitoring PE
During the manual self test, all alarm relays are switched.
Test successful
Test not successful
Test not available
(e.g. incorrect device settings).
Test is being carried out.
isoHR1685DW-925_D00369_01_M_XXEN/02.2021