Operating instructions

Electrical installation
4.9 Other connections
Drive converter cabinet units
Operating Instructions, 10/2008, A5E00288214A
89
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- 33 F127/F125 – connection for thermistor motor protection unit
Equipment designation Description of function
-F127: T1, T2 Thermistor motor protection (alarm)
-F125: T1, T2 Thermistor motor protection (shutdown)
The PTC thermistor sensors are connected directly to terminals T1 and T2 of the evaluation
unit.
Table 4- 34 Maximum cable length for the sensor circuit
Line cross-section in mm² Line length in m
2,5 2 x 2800
1,5 2 x 1500
0,5 2 x 500
Diagnostics
Messages output during operation and in the event of faults (meaning of LEDs on -F125,
F127) are described in the "Additional Operating Instructions" of the Operating Instructions.
4.9.13 PT100 evaluation unit (option L86)
Description
Note
The PT100 evaluation unit and the parameters for the measurement channels are described
in the "Additional Operating Instructions".