Safety Information - Siemens SINAMICS S120 Manual

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9.14 K50, Sensor Module Cabinet-Mounted SMC30
9.14.2

Safety information

Electric shock in the event of voltage flashovers at the temperature sensor
Voltage flashovers in the signal electronics can occur in motors without safe electrical
separation of the temperature sensors.
• Use temperature sensors that fully comply with the specifications of the safety isolation.
NOTICE
Damage when connecting an impermissible number of encoder systems
If more than the maximum permissible number of encoder systems are connected to a
Sensor Module, this will cause damage.
• Only connect one encoder system to a Sensor Module.
NOTICE
Device failure as a result of unshielded or incorrectly routed cables to temperature sensors
Unshielded or incorrectly routed cables to temperature sensors can result in interference
being coupled into the signal processing electronics from the power side. This can result in
significant disturbance of all signals (fault messages) up to failure of individual components
(destruction of the devices).
• Only use shielded cables as temperature sensor cables.
• If temperature sensor cables are routed together with the motor cable, use separately
• Connect the cable shield to ground potential through a large surface area.
Note
Diminished level of interference immunity due to equalizing currents via the electronics
ground
Ensure that there is no electrical connection between the encoder system housing and the
signal cables, or the encoder system electronics.
If this is not carefully observed, under certain circumstances the system will not be able to
reach the required interference immunity level (there is then a danger of equalization
currents flowing through the electronics ground).
378
WARNING
shielded cables twisted in pairs.
Cabinet Modules liquid cooled
Equipment Manual, 04/2020, A5E37067587A