X1 Power Supply - Siemens NCU 7x0.3 PN Series Manual

9.2.3.2

X1 power supply

Properties
This interface is intended exclusively for the connection of the external 24 V power supply.
On the module side, the power supplies are protected against:
● Polarity reversal
● Short-circuit (elec. current limitation of the outputs)
● Overload (self-restoring PTC fuse - Multifuse)
Requirements placed on the DC power supply
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 I/O module for EMC
and/or functional reasons. For EMC reasons, this connection should only be made at one
point; see also EMC Installation Guide.
Table 9- 13
Rated voltage
Non-periodic overvoltages
Transient voltage
interruptions
NCU 7x0.3 PN
Manual, 09/2011, 6FC5397-1EP40-0BA0
DANGER
Requirements of the DC power supply
According to EN 61131-2
Voltage range (average value)
Voltage range (dynamic)
Voltage ripple peak-to-peak
Booting time at POWER ON
Duration of overvoltage
Recovery time
Events per hour
Outage time
Recovery time
Events per hour
Connectable components
9.2 PP 72/48D PN
24 V DC
20.4 V DC 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
99