Siemens SINUMERIK 828D Manual page 73

Risk of lightning strike
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 control unit for EMC
and/or functional reasons. For EMC reasons, this connection should only be made at one
point. As a rule, the connection is provided as standard in the PLC I/Os. If this is not the
case in exceptional circumstances, the ground connection should be made on the
grounding rail of the control cabinet.
See also: "EMC Installation Guideline" Configuration Manual
Table 6- 3
Rated voltage
Non-periodic overvoltages
Transient voltage
interruptions
PPU
Manual, 03/2013, 6FC5397-2DP40-3BA1
DANGER
Technical data of the DC power supply
According to EN 61131-2
Voltage range (mean value)
Voltage range (dynamic)
Voltage ripple peak-to-peak
Booting time at POWER ON
Duration of overvoltage
Recovery time
Events per hour
Idle time
Recovery time
Events per hour
Interface description
6.2 Power supply connection
24 V DC
20.4 VDC to 28.8 V DC
18.5 to 30.2 V DC
5% (unfiltered 6-pulse
rectification)
Any
≤ 35 V
≤ 500 ms
≥ 50 s
≤ 10
≤ 3 ms
≥ 10 s
≤ 10
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