Function; Intended Use; Device Features - Bender ISOMETER isoCHA425 Manual

Function

2 Function
2.1

Intended use

The ISOMETER® monitors the insulation resistance R
standard or according to Combined Charging System (CCS) for nominal system voltage ranges between DC 0 V
and 400 V.
In order to meet the requirements of the applicable standards, customised parameter settings must be made
on the equipment in order to adapt it to local equipment and operating conditions. Please heed the limits of
the range of application indicated in the technical data.
Any other use or a use that goes beyond this constitutes improper use.
To ensure that the ISOMETER® functions correctly, an internal resistance of ≤ 1 k must exist between L+
and L– via the source (e.g. the transformer) or the load.
If the ISOMETER® is installed inside a control cabinet, the insulation fault message must be audible and/or
visible to attract attention.
2.2

Device features

• Monitoring of the insulation resistance R
standard or Combined Charging System (CCS)
• CHAdeMO (Mode CHd):
– Maximum system leakage capacitance 1.6 F per conductor
– Detection of insulation faults in the system voltage range from 50 V to 400 V
– Response time for one-pole insulation faults R
• R ≤ 100 k : max. 1 s
FU
• 100 k < R ≤ 2 M : max. 10 s
FU
– Response time for two-pole insulation faults R
• CCS (Mode dc):
– Detection of insulation faults up to 2 M
– Maximum system leakage capacitance C
– Response time t
an
• Measuring the system leakage capacitance C
• Measuring the nominal system voltage U
• Measuring the residual voltages U
• Selectable start-up delay, response delay and delay on release
• Two separately adjustable response value ranges from 5...250 k (prewarning, alarm)
• Alarm output via LEDs ('AL1', 'AL2'), display, and alarm relays ('K1', 'K2')
• Automatic device self test with connection monitoring
• Selectable N/C or N/O relay operation
• Measured value indication via multi-functional LC display
• Activatable fault memory
• RS-485 (galvanically isolated) including the following protocols:
8 isoCHA425_D00352_03_M_XXEN/08.2023
of DC charging stations in accordance with the CHAdeMO
F
at C ≤ 5 F or R ≤ 100 k : max. 10 s
e F
n
(between L+ and earth) and U
L1e
for DC fast charging stations according to CHAdeMO
F
:
FU
: max. 10 s
FS
: 5 F
e
e
(True-RMS) with undervoltage/overvoltage detection
(between L– and earth)
L2e