Bender ISOMETER iso1685FR, Manual

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15 iso1685FR(M)_D00002_02_M_XXEN/06.2017
3. Function
3.1 Features
• Insulation monitoring of AC and 3(N)AC systems with low leakage capacitance (< 200 nF)
• Fast tripping due to the patented SSCP (Synchronous Sine Correlation Principle) measuring method:
Notification of an insulation fault or shutdown within 150 ms
• Measuring the impedance between the system and earth (detection of ohmic and capacitive insulation
faults)
• Response value Zan: 10 kΩ…1000 kΩ
• Configurable interference detection for the active method (Interference level, consecutive number of
disturbed measurement periods) with the possibility of triggering a device fault in the event of conti-
nuous interference
• Measuring the neutral point shift to earth (UN-PE)
• Visual signalling of alarms, or connection or device errors via LEDs
• 2 redundant signaling relays for the notification of insulation faults
• Connection monitoring of L1/+, L2/–
• Monitoring of the earth connections E/KE
• Self test at device start with automatic notification in the event of a fault
• iso1685FR: RS-485 interface (BMS bus) to output measured values and for configuration
• iso1685FRM: RS-485 interface (BMS bus and Modbus RTU; switched using the DIP switch)
The BMS bus is used to output measured values and to configure the device.
Modbus RTU is used to communicate with the Modbus-analogue converter M-7024. By means of the
converter, the iso1685FRM provides an analogue output.
• μSD card with data logger and history memory for alarms
• Protection against unauthorized or accidental parameter changes
3.2 Product description
3.2.1 General product description
The ISOMETER® iso1685FR… is an insulation monitoring device for IT systems in accordance with IEC 61557-8.
It is applicable for use in AC systems.
3.2.2 Particularities of the ISOMETER® iso1685FRM
The only difference between the ISOMETER® iso1685FRM and the ISOMETER® iso1685FR is the following:
By means of the Modbus-analogue converter M-7024, the ISOMETER® iso1685FRM provides an analogue out-
put. Communication takes place via Modbus RTU. The DIP switch can be used to switch between the BMS and
Modbus protocol.
Further information is available in the following chapter:
• Activating the Modbus RTU protocol: "chapter ISOMETER®s iso1685FRM DIP switch assignment"
• Connection: "chapter 5.2.3 Anschlussplan mit Modbus RTU (ISOMETER® iso1685FRM)" und
"chapter 5.2.5 Step-by-step connection of the iso1685FRM ISOMETER®"