Siemens SINUMERIK MCU1720, Руководство по эксплуатации оборудования

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Requirements of DC power supplies
WARNING
Electric shock when connected to an unsafe power supply
When equipment is connected to an unsafe power supply, exposed components may be at a
hazardous voltage level, which might result in serious injury or death.
The DC power supply must be designed as a circuit of category PELV/DVC A according to IEC/
UL/EN 61800‑5‑1.
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 MCU 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 VDC
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
Duration of overvoltage ≤ 500 ms
Recovery time ≥ 50 s
Events per hour ≤ 10
Transient voltage interruptions
Outage time ≤ 3 ms
Recovery time ≥ 10 s
Events per hour ≤ 10
Further information
More information about recommended power supply units and tables for calculating the current
drawn for SINAMICS S120 module lineups can be found in the
● SINAMICS S120 Booksize Power Units Manual
Connecting
8.8 Power supply X80
MCU 1720
70
Equipment Manual, 09/2019, A5E47437728B AB