Product description
The ISOMETER® iso685-… is an insulation monitoring device for IT systems in accordance
with IEC 61557-8. It is universally applicable in AC, 3(N)AC, AC/DC and DC systems.
AC systems may include extensive DC-supplied loads (such as rectifiers, inverters, variablespeed
drives).
Application
Function
The insulation monitoring device iso685-… continuously monitors the entire insulation
resistance of an IT system during operation and triggers an alarm when the value falls
below a preset response value. To obtain a measurement, the device has to be connected
between the IT system (unearthed system) and the protective earth conductor (PE).
A measuring current in the μA range is superimposed onto the system which is recorded
and evaluated by a micro-controlled measuring circuit. The measuring time is dependent
on the selected measurement profiles, the system leakage capacitance, the insulation
resistance and possible system-related disturbances.
The response values and other parameters are set using a commissioning wizard or via
different setup menus using the device buttons and a high-resolution graphic LC display.
The selected settings are stored in a permanent fail-safe memory. Different languages
can be selected for the setup menus as well as the messages indicated on the display.
The device utilises a real-time clock for storing fault messages and events in a history
memory with time and date stamp. The settings can be protected against unauthorised
modifications by a password. To ensure proper functioning of connection monitoring,
the device requires the setting of the system type 3AC, AC or DC and the required use of
the appropriate terminals L1/+, L2, L3/-.
Device variants
iso685-D
The device version iso685-D features a high-resolution graphic LC display and control
elements for direct operating of the device functions.
iso685-S
The device version iso685-S neither features a display nor a control unit. It can only be
used in combination with FP200 and is indirectly operated via this front panel.
Option „W“
Device variants with Option „W“ are available for extreme climatic and mechanical conditions.
Measurement method
The iso685 series uses the patented AMPPlus measurement method.
This measurement method allows concise monitoring of modern
power supplysystems,
also in case of extensive, directly connected DC components and
high system leakage capacitances.
Standards
The ISOMETER® iso685 series corresponds to the device standard: DIN EN 61557-8
Certifications
*
* only iso685-D
Device features
• Insulation monitoring for unearthed
systems AC, 3(N)AC 0…690 V,
DC 0…1000 V
• Nominal system voltage expandable via
coupling devices
• Two separately adjustable response
values 1 kΩ…10 MΩ
• Combination of AMPPLUS and other
profile-specific measurement methods
• Continuous measurement of capacitance,
voltage and system frequency
• Predefined measurement profiles to
meet different requirements
• Automatic adaptation to the system
leakage capacitance
• INFO button to display device and network
settings
• Self-monitoring with automatic alarm
message
• History memory with real-time clock
(buffer for three days) for storing 1023
alarm messages with date and time
• Current and voltage output 0(4)…20 mA,
0…400 μA, 0…10 V, 2…10 V (galvanically
separated) which is analogous to the
measured insulation value of the system
• Permanent coupling monitoring of the
measuring lines
• Freely configurable digital and analogue
inputs and outputs
• Two separate alarm relays with potentialfree
contact
• N/O or N/C operation selectable
• High-resolution graphic LC display
• IsoGraph function for time-related representation
of the insulation resistance
• Remote setting of certain parameters via
Internet (web server/option; COMTRAXX®
Gateway)
• Worldwide remote diagnosis via Internet
• Modbus TCP, web server and BCOM
• Multilingual
ISOMETER® iso685-D
• AC, DC or AC/DC main circuits
• AC/DC main circuits with directly connected
DC components, such as rectifiers,
converters, regulated drives
• UPS systems, battery systems
• Heaters with phase control
• Systems including switch-mode power
supplies
• IT systems with high leakage capacitances
