L87, Insulation Monitoring - Siemens SINAMICS S120 Manual

Danger of injury through contact with hot surfaces on the cabinet anti-condensation heating
In operation, the cabinet anti-condensation heating can reach high temperatures, which can
cause burns if touched.
• Allow the cabinet anti-condensation heating to cool down before starting any work.
• Wear the appropriate personnel protection equipment, e.g. gloves.
Note
Provide a temperature controlled supply voltage
The supply voltage can be provided by means of a temperature control, to prevent the anti-
condensation heating unnecessarily operating at a higher ambient temperature.
9.35

L87, insulation monitoring

Availability of option
This option is available for the following S120 Cabinet Modules:
● Basic Line Connection Modules
● Active Line Connection Modules
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.
Note
Number of insulation monitors
Only one insulation monitor can be used within the same electrically-connected network!
Cabinet Modules liquid cooled
Manual, 10/2015, A5E37067587A
CAUTION
9.35 L87, insulation monitoring
Options
389