Electrical Installation 11/03
SINAMICS G150
4-38 Operating Manual
4.9.11 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.
Connection
Table 4-30 F127/F125 – connection for thermistor motor protection unit
Equipment designation Function description
F127 T1, T2 Thermistor motor protection (warning)
F125 T1, T2 Thermistor motor protection (shutdown)
The PTC thermistor sensors are connected directly to terminals T1 and T2 of the
evaluation unit.
Table 4-31 Maximal line 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) are
described in "Additional Operating Instructions" in the operating manual.
4.9.12 PT100 Evaluation Unit (Option L86)
Description
NOTE
The PT100 evaluation unit and the parameters for the measurement channels are
described in "Additional Operating Instructions".
The PT100 evaluation unit can monitor up to 6 sensors. The sensors can be
connected using a two-wire or three-wire system. With the two-wire system, inputs
Tx1 and Tx3 must be assigned. With the three-wire system, input Tx2 must also be
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