ISOMETER® iso1685FR / iso1685FRM

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.

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 output. Communication takes place via Modbus RTU. The DIP switch can be used to switch between the BMS and Modbus protocol.

Insulation monitoring is carried out using an active measuring signal which is superimposed via the integrated coupling of the IT system to earth.
If the impedance value Ze between the IT system and earth falls below the set response value Zan, the alarm LEDs ALARM 1 and ALARM 2 light up, and the alarm relays K1 and K2 are
switched on. In addition to the active method, an optional passive method can be activated which monitors the unbalance of the IT system by measuring the voltage between the star
point and earth of the IT system. If the voltage UN-PE between the star point and earth exceeds the set response value Uan, the alarm LEDs ALARM 1 and ALARM 2 light up and the alarm relays K1 and K2 switch.
Both measuring methods (active and passive) work in parallel to the alarm relays K1 and K2.
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:

Impedance Z_e between the system and earth
Insulation fault Re between the system and earth (when the system capacity has been set)
Voltage between the star point and earth
System frequency
Insulation fault
Connection fault
Device error

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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.

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 output. Communication takes place via Modbus RTU. The DIP switch can be used to switch between the BMS and Modbus protocol.

Insulation monitoring is carried out using an active measuring signal which is superimposed via the integrated coupling of the IT system to earth.
If the impedance value Ze between the IT system and earth falls below the set response value Zan, the alarm LEDs ALARM 1 and ALARM 2 light up, and the alarm relays K1 and K2 are
switched on. In addition to the active method, an optional passive method can be activated which monitors the unbalance of the IT system by measuring the voltage between the star
point and earth of the IT system. If the voltage UN-PE between the star point and earth exceeds the set response value Uan, the alarm LEDs ALARM 1 and ALARM 2 light up and the alarm relays K1 and K2 switch.
Both measuring methods (active and passive) work in parallel to the alarm relays K1 and K2.
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:

Impedance Z_e between the system and earth
Insulation fault Re between the system and earth (when the system capacity has been set)
Voltage between the star point and earth
System frequency
Insulation fault
Connection fault
Device error

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Kenmerken

Insulation monitoring of AC and 3NAC systems with low leakage capacitance (< 200 nF)
Fast tripping due to the patented SSCP (Synchron Sine Correlation Principle) measurement method: Notification of an insulation fault or shutdown within 150 ms
Impedance measurement between the system and earth (detection of ohmic and capacitive insulation faults)
Response value Z_an: 10…1000 kΩ
Configurable interference detection for the active method (interference level, consecutive number of disrupted measurement periods) with the possibility of
triggering a device error in the event of continuous interference
Measurement of the star point shift to earth (UN-PE)
Visual signalling of alarms, or connection or device errors via LEDs
2 redundant alarm relays for the notification of insulation faults

Connection monitoring of L1/+, L2/–
Monitoring of the earth connection 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; can be switched using the DIP switch)
The BMS bus is used to output measured values and for configuration of 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 unauthorised or accidental parameter changes

Toepassingen

Systems with very low leakage capacitance Ce ≤ 200 nF where very fast alarm response is necessary.
See Wiring diagram