Siemens SINAMICS G120 Operating Instructions Manual page 70

Functions
8.2 Thermal motor protection
The following function is implemented:
Figure 8-2
The device operates in a non-volatile fashion. This means that also when the control supply
voltage fails (24 V DC), the previous trip is saved. When the control voltage fails, the trip
signal is redundantly issued (voltage must be available at the signal if no fault is present).
The sensor cable has a short-circuit and no-load detection function. The module has been
designed so that the temperature sensor (not the device itself) at the motor can be
connected in hazardous zones.
The sensor cable (X3) has protective separation with respect to the 24VDC supply, the other
terminals and the housing (PELV/SELV). The sensor cable can be connected to motors for
TN and IT line supplies up to 690 V.
The measuring circuit cables must be routed as separate control cables. It is not permissible
to use the cores of the motor supply cable or other main supply cables. Shielded control
cables should be used if extremely inductive or capacitive interference is expected as a
result of power cables routed in parallel.
Use in hazardous zones with the danger of gas explosion
The TMP functionality is permitted as associated equipment of device group II, Category (2)
G, i.e. for use in areas where explosive gas atmospheres can occur in normal operation
(Zone 1). Conformance with Directive 94/9 EC Appendix II is confirmed with
PTB 09 ATEX 3008. The safety switching devices, with the appropriate settings, are required
for safe operation of motors, type of protection "Increased safety" (Ex e) and "Flameproof
enclosure" (Ex d) and are used outside hazardous zones.
PTB 09 ATEX 3008 Ex II (2) GD
The increased danger in hazardous zones demand that the following are carefully observed -
the operating instructions, the safety and commissioning notes and standard (EN 60 079-14)
for electrical equipment for hazardous zones with explosive gas atmospheres. A risk analysis
must be drawn-up for the complete plant/system or machine. This device may not be used
for plants/systems or machines with a higher potential of danger than indicated in the
specified ATEX certification.
70
Control supply voltage
Chemical industry module CM240NE with CU250S-2 DP
Operating Instructions, 03/2014, A5E34142527B-AA