Function; Device Features; Product Description; General Product Description - Bender ISOMETER ISO1685 Series Manual

3. Function

3.1 Device features

• Insulation monitoring in extensive unearthed power supply systems up to
AC 1000 V / DC 1500 V
• Measurement of low-resistance insulation faults
• Separately adjustable response values R
(both 200 Ω...1 MΩ) for prewarning and alarm
• Automatic adaptation to high system leakage capacitances up to 2000 µF,
selectable range
• Integrated locating current injector up to 50 mA
• Device self test with automatic fault message in the event of a fault
• Alarm relays separately adjustable for insulation fault 1, insulation fault 2 and device
error
• RS-485 interface (BMS bus), e.g. to control insulation fault location
• µSD card with data logger and history memory for alarms

3.2 Product description

3.2.1 General product description

The ISOMETER® is an insulation monitoring device for IT systems in accordance with IEC
61557-8 and IEC 61557-9. The device is applicable in AC/DC systems.
9
(Alarm 1) and R (Alarm 2)
an1 an2
Function
3.3 Function
Insulation monitoring is carried out using an active measuring pulse which is superimpo-
sed onto the IT system to earth via the integrated coupling.
When the insulation resistance between the IT system and earth falls below the set
prewarning response value R the LED "Alarm 1" lights and the alarm relay K1 swit-
an1
ches. When the values fall below the alarm response value R
and the alarm relay K2 switches.
The locating current injector integrated in the device for insulation fault location is exter-
nally activated via the BMS interface. When starting insulation fault location, the LED
"PGH on" signals the locating current pulse.
The integrated µSD card is used as data logger for storing all relevant events.
The following measured values, statuses and alarms are stored during operation:
• Insulation resistances and leakage capacitances
• System voltages, partial voltages to earth, supply voltages
• Temperatures: current controller of the locating current injector, coupling L1/+,
L2/–
• Insulation fault
• Connection fault
• Device error
Following each device start-up, a new file is generated. If the current file size exceeds 10
MByte during operation, a new file is generated. The file name contains the time and date
of the creation time. Usually, it takes two days until the maximum file size is reached.
Hence, a µSD card with a memory space of 2 GByte can record data for approx. 400 days.
When the card has reached the maximum data volume, always the oldest file will be over-
written. The history memory on the µSD card contains all saved alarms in csv. format.
also LED "Alarm 2" lights
an2 ,
iso1685P_D00003_01_M_XXEN / 12.2016