Siemens SINAMICS S120 Manual page 230

Line Modules
5.5 Active Line Modules Chassis-2
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.
• Only use temperature sensors that fully comply with the specifications of the safety
• If safe electrical separation cannot be guaranteed (for linear motors or third-party
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.
NOTICE
Damage to the motor in the event of incorrectly connected KTY temperature sensor at
terminals X41:3,4
If a KTY temperature sensor is connected with incorrect polarity, it is not possible to detect
when the motor overheats. Overheating can cause damage to the motor.
• Connect a KTY temperature sensor with the correct polarity.
NOTICE
Looping the circuit breaker into the EP terminal circuit for infeed units capable of
energy recovery
If the upstream circuit breakers are not controlled from the SINAMICS drive group in the
case of infeed units capable of energy recovery, then this can have a damaging reaction on
the section that has been shut down when the circuit breaker is opened. As a consequence,
under certain circumstances, the components connected in the line supply section involved
could be damaged as a result of overvoltage.
• If, for infeed units capable of energy recovery, the upstream circuit breaker is not
228
WARNING
isolation.
motors, for example), use a Sensor Module External (SME120 or SME125) or Terminal
Module TM120.
shielded cables twisted in pairs.
controlled from the SINAMICS drive group, then an auxiliary contact of the circuit breaker
should be looped into the circuit associated with the EP terminals.
Air-cooled chassis power units
Equipment Manual, 06/2020, 6SL3097-5AE00-0BP3