X1 Power Supply; Requirements For The Power Supply - Siemens SINUMERIK 828D Manual

5.3

X1 power supply

5.3.1

Requirements for the power supply

The DC power supply is always referenced to ground and may not be generated by an
autotransformer.
User interfaces must be powered via a DC power supply with safe isolation to EN 61800-5-
1.
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 5- 2
Rated voltage
Non-periodic overvoltages
Transient voltage
interruptions
Digital inputs
The 24 V supplied at X1 are used to supply the 72 digital inputs.
If the internal supply voltage is not used to supply the digital inputs, this can optionally be
replaced by an external power supply (24 V DC). The reference ground of the power supply
source must each be connected with X111, X222, X333, pin 1 (GND). X111, X222, X333, pin
2 (P24OUT) then remains open.
PP 72/48D 2/2A PN I/O module
Manual, 03/2010
DANGER
Requirements 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
Connection
5.3 X1 power supply
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
21