Bender ISOMETER isoCHA425 Manual page 9

Function
3.2.2 Function tests of relay in the charging station and the vehicle
If the ISOMETER® is disconnected from the voltage source to be monitored single-pole
during a function test of the charging station or vehicle relay, a false alarm can happen
depending on the location of an existing insulation fault. For insulation faults above
250 kΩ, the false alarm can be avoided by a resistance of 200 kΩ connected directly
between the terminals "L+" and "L-".
3.2.3 Isolation from the system to be monitored
If the device has no supply voltage or is in stop mode, it decouples terminals "L+" and
"L-" internally from the IT system being monitored. In this case, an insulation measure-
ment up to DC 400 V can be carried out using an insulation tester.
3.2.4 Monitoring the insulation resistance
The two parameters that monitor the insulation resistance, R1 and R2, can be found in the
response value menu "AL" (see table on
than the value R2. If the insulation resistance R
ues R1 or R2, an alarm message will be signalled. If R
hysteresis value (see table on page 16), the alarm will be cleared.
3.2.5 Undervoltage/overvoltage monitoring
In the response value menu "AL" (see
ing the nominal system voltage U can be activated or deactivated. The maximum und-
n
ervoltage value is limited by the overvoltage value.
The r.m.s. value of the nominal system voltage U
voltage U reaches, falls below or exceeds the limit values (U < or U >), an alarm will be
n
signalled. If the maximum permissible nominal system voltage U
is exceeded, an alarm message will be initiated even when the overvoltage limit value has
been deactivated. The alarm will be deleted when the limit values plus hysteresis (see
page 16) are no longer violated.
3.2.6 Self test/error codes
The integrated self test function checks the function of the insulation monitoring device,
and connection monitoring checks the connections to the system to be monitored. The
alarm relays are not switched during the self test. This can be changed using the param-
eter "test" in the alarm assignment (menu "out",
dicates "tES".
When malfunctions are detected or connections are missing, the LEDs "ON"/"AL1"/"AL2"
flash. The respective error codes ("E.xx") will be indicated on the display and the relay "K2"
9
page 16). The value R1 can only be set higher
reaches or falls below the activated val-
F
exceeds the values R1 or R2 plus the
F
page 16), the parameters (U < and U >) for monitor-
is monitored. If the nominal system
n
set for the ISOMETER®
n
page 17). During the test, the display in-
Function
switches. The relays can be assigned to a device error with the parameter "Err" in the "out"
menu in the alarm assignment.
Error codes
If, contrary to expectations, a device error should occur, error codes will appear on the
display. Some of these are described below:
Error code
PE connection error
"
The connections E
E.01 Action:
Check connection, eliminate error. The error code will be erased auto-
matically once the error has been eliminated.
Connection fault system
The internal resistance of the system is too high or the connection
" "
or L- to the system is interrupted. The terminals
E.02
nected false.
Action:
Check connection, eliminate error. The error code will be erased auto-
matically once the error has been eliminated.
Connection fault system voltage reversal
" "
The terminals L+
E.03
tored with reversed polarity. Detection from U
Measurement technique error:
Due to system interferences or a device error, the insulation measuring
value is no longer updated. The pre- and main alarm are set for the insu-
lation measuring value simultaneously.
E.05 Calibration invalid after software update:
In case of a software update, E.05 appears together with E.08 if the new
software is no longer compatible with the calibration of the device. Eit-
her the previous software version must be installed or the device must
be calibrated new in the factory.
The permissible system leakage capacitance according to the datasheet
E.07
is exceeded.
A calibration error was detected during the device test.
Action:
E.08
If the error continues to exist after checking the device connections,
there is an error inside the device.
Description
" " "
or KE to earth are interrupted.
" " "
L+ und L-
" "
und L- are connected to the DC system to be moni-
< -30 V .
n DC
isoCHA425_D00352_01_M_XXEN/10.2019
" "
L+
"
are con-