iso1685DP_D00272_03_M_XXEN/08.2017
9
Function
3. Function
3.1 Features
• Insulation monitoring of IT systems up to
iso1685DP-425 AC 1000 V/DC 1500 V
iso1685D-HV-425 AC 2000 V/DC 3000 V
• Measurement of low-resistance insulation faults
• Separately adjustable response values R
an
1 (alarm 1) and R
an
2 (alarm 2)
(both 200 …1 M) for prewarning and alarm
• High-resolution graphic LC display for excellent readability and recording of the
device status
• Automatic adjustment to high system leakage capacitances, selectable range
• Connection monitoring
• Integrated locating current injector up to 50 mA for insulation fault location
(only iso1685DP)
• Device self test with automatic message in the event of a fault
• Alarm relays separately adjustable for insulation faults and device errors
• RS-485 interface (BMS bus), e.g. for controlling insulation fault location
• The integrated µSD card slot cannot be used. The device does not store any data on
the µSD card.
3.2 Product description
The ISOMETER® iso1685Dxx is used for insulation monitoring of extensive IT systems up
to AC 1000 V/DC 1500 V or AC 2000 V/DC 3000 V. The specially developed measurement
method monitors the insulation resistance also in installations where extremely high sys-
tem leakage capacitances against earth exist due to interference suppression methods.
Adaptation to system-related high leakage capacitances also occurs automatically.
The ISOMETER® iso1685Dxx generates locating current pulses required for insulation
fault location. That allows the localisation of the insulation fault using permanently in-
stalled or mobile insulation fault locators.
3.3 Function description
Insulation monitoring is carried out using an active measuring pulse which is superim-
posed onto the IT system to earth via the integrated coupling. When the insulation resist-
ance between the IT system and earth falls below the set prewarning response value
R
an
1, the “ALARM 1” LED lights and the relay K1 (11/12/14) switches. When the insulation
resistance falls below the alarm response value R
an
2, the alarm relay K2 (21/22/24) switch-
es and the “ALARM 2” LED lights.
The locating current injector integrated in the device for insulation fault location is acti-
vated externally via the BMS interface. When starting the insulation fault location, the LED
“PGH ON” signals the locating current pulse.
The ISOMETER® cannot take over the master function. If there is no master in the system,
the device can act as a backup master and communicate with the slaves in the system.
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