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Emergency Stop Category 0; 24 Vdc (option L66); Signal And Control Cable (max. 2.5 Mm²) (option M33); Connection Of Auxiliary Voltage And Signal Cable From Above (option M34); Degree Of Protection Ip44 (option M44) - Siemens SINAMICS SM120 Operating Instructions Manual

Control module.
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3.4 Options

EMERGENCY STOP Category 0; 24 VDC (option L66)

The Emergency mushroom-head pushbutton is connected with the safety relay.
The circuit-breaker disconnects the power supply to the converter. The motor coasts down.
Because not all auxiliary circuits are disconnected when you press the mushroom-head
pushbutton, you must switch off the auxiliary power supply at the plant. Otherwise the pre-
charging device or the pre-magnetization equipment (when present) can cause medium-
voltage (>1 kV) to be present in the converter.
See also
Emergency mushroom-head pushbutton (option L45) (Page 44)
Signal and control cable (max. 2.5 mm²) (option M33)
Signal and control cables are connected directly to the terminals on Terminal Module TM31
or TM15 as standard. The maximum connectable cross-section for these cables to the
Terminal Modules TM31 and TM15 is limited to 1.5 mm
With option M33, you can connect signal and control cables with connection cross-sections of
up to 2.5 mm

Connection of auxiliary voltage and signal cable from above (option M34)

This option makes it possible to bring the cables for the auxiliary voltage and signal cables into
the cabinet from the top.

Degree of protection IP44 (option M44)

The degree of protection of the power section is increased from IP43 to IP44. The internal
losses are dissipated by a closed cooling circuit with air-water heat exchanger into the water.

Suitability for marine use (option M66)

The drive design corresponds to the requirements of the following classification societies.
● Lloyds Register
● American Bureau of Shipping
● Germanischer Lloyd
● Bureau Veritas
● Det Norske Veritas•
● Chinese Classification Society
to a terminal strip via screw terminals.
Operating Instructions 07/2015


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