Connecting
7.4 Power supply
NCU 7x0.2
Manual, 02/2011, 6FC5397-0AP20-0BA0
51
Table 7- 4 DC power supply requirements in accordance with EN 61131-2
Rated voltage 24 V DC
Voltage range (average value) 20.4 to 28.8 V DC
Voltage ripple peak-to-peak 5 % (unfiltered 6-pulse rectification)
Ramp-up time at power-on Any
Non-periodic overvoltages ≤ 35 V
Duration of overvoltage ≤ 500 ms
Restoration time ≥ 50 s
Events per hour ≤ 10
Transient voltage interruptions
Outage time ≤ 3 ms
Restoration time ≥ 10 s
Events per hour ≤ 10
Additional references
Recommended power supply units and tables for calculating power consumption for
interconnection with SINAMICS S120 modules can be found in the chapter entitled Control-
Cabinet Construction and EMC Booksize in the SINAMICS S120 Booksize Power Units
Manual.
7.4.3 Connecting the power supply
Wiring the screw-type terminal block
The required 24 V DC load current supply is wired to screw-type terminal block X124.
DANGER
The 24 V direct voltage is to be configured as a protective extra low voltage - DVC A or
PELV.
Supply system lines
Table 7- 5 Cable specification for X124
Characteristics Version
Connector type Screw-type terminals
Connection option Up to 2.5 mm
2
Current carrying capacity Max. 10 A
Max. cable length 10 m
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