Thermistor Motor Protection Unit (Option L83/L84) - Siemens SINAMICS S150 Operating Instructions Manual

Electrical installation
4.9 Other connections
4.9.12

Thermistor motor protection unit (option L83/L84)

Description
This option includes the thermistor motor protection unit (with PTB approval) for PTC
thermistor sensors (PTC resistor type A) for warning and shutdown. The power supply for
the thermistor motor protection unit is provided inside the converter where the evaluation is
also performed.
Option L83 triggers the "external alarm 1" (A7850) if a fault occurs.
Option L84 triggers the "external fault 1" (F7860) if a fault occurs.
Connection
Table 4-34
The PTC thermistor sensors are connected directly to terminals T1 and T2 of the evaluation
unit.
Table 4-35
Diagnosis
Messages output during operation and in the event of faults (meaning of LEDs on -F125, -
F127) are described in "Additional Operating Instructions" in the operating manual.
86
F127/F125 – connection for thermistor motor protection unit
Equipment designation
-F127:T1,T2
-F125: T1, T2
Maximum cable length for the sensor circuit
Line cross-section in mm²
2.5
1.5
0.5
Description of Functions
Thermistor motor protection (alarm)
Thermistor motor protection (shutdown)
Line length in m
2 x 2800
2 x 1500
2 x 500
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A