8.5.2
Requirements for the power supply
External 24 V power supply
Power is supplied to the NCU by an external 24 V power supply (e.g.: SITOP). The following
power consumption values for an NCU provide a configuration basis for calculating the 24 VDC
power supply.
Table 8-3
Input voltage specification
Typ. current consumption
1)
Max. power consumption
2)
0.65 A
11.1 A
1)
NCU only (processor, memory, etc.)
2)
NCU with full load at all outputs (digital outputs, USB, DRIVE-CLiQ, PROFIBUS DP, etc.)
Requirements of DC power supplies
WARNING
Electric shock as a result of an unsafe DC power supply
If an unsafe DC power supply is connected, exposed components may be at a hazardous
voltage level, which can result in serious injury or death.
• As DC power supply, use a Category PELV/DVC A circuit according to EN 61010-1.
WARNING
Electric shock due to inadequately protected power supply cables
If power supply cables are inadequately protected, then lightning strikes can result in a surge
voltage. This can result in death, serious injury and material damage.
In the case of supply lines > 10 m, protectors must be installed at the device input in order to
protect against lightning (surge).
The DC power supply must be connected to the ground/shield of the NCU for EMC and/or
functional reasons. For EMC reasons, this connection should only be made at one point. This
connection is normally provided as standard in the S7-1500 I/Os. In exceptional circumstances
when this is not the case, the ground connection should be made on the grounding rail of the
control cabinet; please also refer to /EMC/EMC Installation Guide.
Table 8-4
DC power supply requirements according to EN 61131-2
Rated voltage
24 V DC
Voltage range (average value)
20.4 VDC to 28.8 VDC
Voltage ripple peak-to-peak
5% (unfiltered 6-pulse rectification)
Ramp-up time at POWER ON
Any
Non-periodic overvoltages
≤ 35 V
Connecting
8.5 Power supply
NCU 1740
64
Equipment Manual, 10/2021, A5E51087503B AA
Содержание SINUMERIK ONE NCU 1740
Страница 48: ...Dimension drawings 6 1 NCU 1740 dimension drawing NCU 1740 48 Equipment Manual 10 2021 A5E51087503B AA ...
Страница 52: ...Installation 7 4 Mounting the NCU without spacers NCU 1740 52 Equipment Manual 10 2021 A5E51087503B AA ...
Страница 96: ...Technical data 11 3 Recycling and disposal NCU 1740 96 Equipment Manual 10 2021 A5E51087503B AA ...
Страница 156: ...Connectable components 12 3 PP 72 48D PN 2 2A PN NCU 1740 156 Equipment Manual 10 2021 A5E51087503B AA ...
Страница 160: ...Safety symbols NCU 1740 160 Equipment Manual 10 2021 A5E51087503B AA ...