L87, Insulation Monitoring - Siemens SINAMICS S120 Equipment Manual

Options

8.28 L87, insulation monitoring

8.28 L87, insulation monitoring
Availability of option
This option is available for the following S120 Cabinet Modules:
● Line Connection Module
Description
In non-grounded systems (IT systems), the insulation monitor checks the entire electrically-
connected circuit for insulation faults. It measures the insulation resistance as well as all
insulation faults in the Cabinet Modules, from the supply infeed to the motors. Two response
values (between 1 kΩ and 10 MΩ) can be set. If a response value is undershot, a warning is
output to the terminal. System errors are output via the signaling-relay system.
When the Cabinet Module is delivered, the plant configuration (one or several loads in one
electrically-connected network) and the protection philosophy (immediate shutdown in the
event of an insulation fault or restricted continued motion) can vary. This means that the
signaling relays of the insulation monitor must be integrated by the customer in the fault and
warning sequence.
Safety information
NOTICE
Only one insulation monitor can be used within the same electrically-connected network.
Note
When using the insulation monitor, you must remove the connection clamp for the noise
suppression capacitor (in the Active Interface Module of the Active Line Module, Basic Line
Module, or Smart Line Module).
See the chapter titled "Connections: Operating Cabinet Modules on an isolated-neutral
supply system (IT system)".
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S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A