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12.2.3.2
Power supply
Requirements for the power supply
Inadequately fused supply cables can be life-threatening
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/shielding of the Control Unit for EMC
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
Rated voltage
Non-periodic overvoltages
Transient voltage interrup‐
tions
X1 terminal
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.
NCU 1750
Equipment Manual, 10/2023, A5E45627807B AH
DANGER
12.2 PP 72/48D PN and PP 72/48D 2/2A PN
According to EN 61131-2
Voltage range (average value)
Voltage range (dynamic)
Voltage ripple peak-to-peak
Ramp-up time at POWER ON
Duration of overvoltage
Recovery time
Events per hour
Outage time
Recovery time
Events per hour
Wiring area
Torque
Conductor material
Connectable components
24 V DC
20.4 V DC to 28.8 V DC
18.5 VDC to 30.2 V DC
5% (unfiltered 6-pulse rectifi‐
cation)
Any
≤ 35 V
≤ 500 ms
≥ 50 s
≤ 10
≤ 3 ms
≥ 10 s
≤ 10
AWG 28 to AWG 12
0.51 Nm
Only use copper conductors
121
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