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iso415R-x_D00401_00_M_XXEN / 04.2021
Function
2.3.5 Connection monitoring E/KE
The connection monitoring E/KE continuously checks the low-resistance connection of the
ISOMETER® between terminal E and earth with the input KE. If the resistance is too high, the alarm
E/KE is triggered and indicated by the LEDs.
The alarm can be assigned to relay K1 via the interface register "Alarm assignment E/KE". If the
fault memory is not enabled, the alarm is automatically cleared after the connection fault has
been eliminated.
2.3.6 Manual self test
By pressing the T/R button for > 3 s and < 6 s or by executing the Modbus function "Test", the de-
vice simulates an insulation fault and the connection to the system is checked. All LEDs light up.
This message can be assigned to relay K1 via the interface register "Alarm assignment Test". After
automatic completion of the test, the signalling status before the test is restored even if the fault
memory is enabled.
i
The test button should be pressed and the self test, including the relay function, should
be checked annually.
2.3.7 Malfunction
If an internal device error occurs, the status LED lights up RED. The error code can be queried via
the device interfaces.
2.3.8 Alarm assignments to the alarm relay
Based on the table „3.2.1.3 Relay“ on page 15, the alarms can be assigned to the relay via the
device interface.
2.3.9 Delay times
t
b
,
t
,
t
on
and
t
off
The times
t
b
,
t
,
t
on
and
t
off
described below delay the output of alarms via LEDs, relay and Modbus
RTU.
2.3.9.1 Recovery time
t
b
The recovery time is the time the device needs to be ready for measurement after connecting the
supply voltage
U
s
.
2.3.9.2 Start-up delay
t
After connecting the supply voltage
U
S
, the measuring function is delayed by the set time
t
(0…1800 s) plus the recovery time
t
b
.
2.3.9.3 Response delay
t
on
The insulation monitoring device requires the operating time t
ae
from the moment the measured
value falls below a response value until this violation is detected. The corresponding alarm is only
set if the violation is detected without interruption for the duration of the response delay time t
on
(0...1800 s). The total response time t
an
is the sum of the operating time t
ae
and the response delay
time t
on
.
