Siemens SINAMICS S120 Manual page 293

Danger to life due to 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 to the motor in the event of incorrectly connected KTY temperature sensor
A KTY temperature sensor connected with incorrect polarity cannot detect if the motor
overheats. Overheating can cause damage to the motor.
• Connect a KTY temperature sensor with the correct polarity.
NOTICE
Overheating of the motor through jumpering the temperature sensor connections
Jumpering of the temperature sensor connections "+ Temp" and "- Temp" results in
incorrect measurement results. Damage to the motor can result if the overheating is not
detected.
• When using several temperature sensors, separately connect the individual sensors to
NOTICE
Overheating of the motor through cables with too high a resistance
Cable length and cable cross-section can falsify the temperature measurement (10 Ω cable
resistance for a PT100 can falsify the measurement result by 10%). Damage to the motor
can result if the overheating is not detected.
• Use only cable lengths ≤ 300 m.
• For cable lengths >100 m, use cables with a cross-section of ≥1 mm
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.
• Recommendation: Use suitable Motion Connect cables.
Cabinet Modules liquid cooled
Manual, 10/2015, A5E37067587A
WARNING
"+ Temp" and "- Temp".
shielded cables twisted in pairs.
9.5 G51 to G54, temperature sensor module TM150
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