Functional Description; Sd Card - Bender ISOMETER isoPV1685P Manual

2.4

Functional description

Insulation monitoring is carried out using an active measuring pulse which is superimposed onto the IT system
to earth via the integrated coupling. If the insulation resistance between a PV system and earth falls below
the set prewarning response value R
resistance falls below the alarm response value R
switches. The relay K3 switches in case of device or connection failures.
The locating current injector integrated in the device for insulation fault location is either activated externally
via the BMS interface or via the internal backup master function if no external master has been connected.
When starting the insulation fault location, the LED PGH ON signals the locating current pulse.
The insulation fault location can be started manually via the digital input 1, e.g. for insulation fault location
with mobile insulation fault locators (e.g. EDS195).
Installation inside a control cabinet
If the ISOMETER
visible to attract attention.
IT systems with several ISOMETER
Only one ISOMETER
interconnected via tie switches, ISOMETER
or switched to inactive.
If IT systems are coupled via capacitors or diodes, a central control of the various ISOMETER
Prevent measurement errors!
In galvanically coupled DC circuits, an insulation fault can only be detected correctly if a minimum current
of > 10 mA flows through the rectifiers.
Unspecified frequency range
Depending on the application and the selected measurement profile, continuous insulation monitoring
is also possible in low frequency ranges. For IT systems with frequency components above the specified
frequency range, there is no influence on the insulation monitoring.
2.4.1

SD card

The integrated SD card is used as data logger for storing all relevant events.
The following measured values, statuses and alarms are stored during operation:
• Insulation resistance and leakage capacitance
• System voltage, partial voltages to earth, supply voltages
• Temperature locating current injector
• Temperature coupling L+, L–
• Insulation fault
• Connection faults and device errors
Following each start-up, a new log file is generated. If the current file size exceeds 10 MB during operation, a
new file is generated. The file name contains the time and date of the creation time. The typical time that is
needed until the maximum file size is reached is approximately 2 days. Hence, a SD card with a memory space
of 2 GB can record data for approx. 400 days.
When the maximum data limit is reached on your card, the oldest file in each case will be overwritten. The
history memory that is also copied to the SD card contains all alarms in .csv format.
, the LED ALARM 1 lights up and relay K1 switches. If the insulation
an1
® is installed inside a control cabinet, the insulation fault message must be audible and/or
® s
® may be connected in a galvanically connected system. In IT systems that are
, the LED ALARM 2 lights up and the alarm relay K2
an2
® s that are not required must be disconnected from the IT system
isoPV1685P_D00007_09_M_XXEN / 07/2024
ISOMETER® isoPV1685P
® must be used.
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