Siemens SINAMICS S150 NEMA, Operating Instructions Manual, Page: 129 / 862

Electrical installation
4.9 Additional connections
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
127
Connecting
Table 4- 34 Terminal block X390 – connection for enclosure light with service socket
Terminal Designation Technical specifications
1 L1 115 V AC
Power supply
2 N
3 Protective ground Protective conductor
Max. connectable cross-section: #12 AWG (4 mm²)
4.9.6 Enclosure space heater (option L55)
Description
The enclosure space heater is used at low ambient temperatures and high levels of humidity
to prevent condensation from forming.
For enclosure widths 15.8" (400 mm) and 23.6" (600 mm), one 100-W heater is used. For
enclosure widths ranging from 31.5" (800 mm) to 47.2" (1200 mm), two heaters, 100 W
each, are installed. The power supply for the heating (115 V AC) must be provided externally
and protected with a fuse (max. 10 A).
WARNING
Dangerous voltage as a result of external auxiliary supply
When an external supply voltage for the cabinet anti-condensation heating is connected,
dangerous voltages continue to be present in the cabinet unit even when the mains switch
is open. Death or serious injury can result when live parts are touched.
• Observe the general safety instructions when working on the device.
CAUTION
Burns caused by hot cabinet anti-condensation heating surfaces
During operation, the cabinet anti-condensation heating can reach high temperatures and
cause burns if touched.
•
Allow the cabinet anti-condensation heating to cool down before starting any work.
•
Use the appropriate personnel protection equipment, e.g. gloves.
Note
Providing supply voltage with temperature control
The supply voltage can be provided by means of a temperature control, to avoid
unnecessary operation of the anti-condensation heating at higher ambient temperatures.