Table of Contents
Advertisement
Electrical installation
4.9 Additional connections
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 motor when KTY temperature sensor is connected incorrectly
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
Overheating of the motor due to jumpering of the temperature sensor connections
Jumpering 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
Device failure due to 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 twisted-pair,
• Connect the cable shield at both ends to ground potential over a large surface area.
Note
Incorrect temperature measured values as a result of cables with an excessively high
resistance
An excessively long cable length or an excessively small cable cross-section can falsify the
temperature measurement (for a PT100, 10 Ω cable resistance can falsify the measurement
result by 10%). As a consequence, excessively high measured values are output, which
could lead to the motor being unnecessarily tripped prematurely.
• Only use cable lengths ≤ 990 ft (300 m).
• For cable lengths > 330 ft (100 m), use cables with a cross-section of ≥1 mm
154
WARNING
"+Temp" and "-Temp".
separately-shielded cables.
Operating Instructions, 12/2018, A5E36652151A
.
2
Enclosed Drives
Advertisement
Table of Contents
