Supply Concept Of Control Voltage; Internal 24 V Supply Voltage - Lenze 8400 protec Hardware Manual

4.6

Supply concept of control voltage

8400 protec controllers generate the 24 V supply voltage of the control electronics from
the mains voltage by means of an integrated power supply unit (mains−operated supply).
An external 24 V buffer voltage from a safely separated power supply unit (SELV/PELV)
must be connected in order to implement a self−contained supply of the control
electronics.
The 24 V supply voltage is required for the control electronics and other components such
as fieldbus communication and/or drive−based safety.
In addition, the supply voltage is available at the terminals, irrespective of the fact whether
it is fed internally or externally. Information on the supply voltage at the digital and analog
terminals is provided under:
Digital inputs(¶ 64)
ƒ
Digital outputs(¶ 65)
ƒ
Analog inputs(¶ 66)
ƒ
Synchronous serial interface (SSI) (¶ 66)
ƒ
The supply voltage is preferentially used for:
Connecting potential−free contacts to digital inputs
ƒ
Supplying external sensors
ƒ
At an external 24 V supply voltage, the rated values may deviate according to the voltage
source.
4.6.1

Internal 24 V supply voltage

At an internal 24 V supply voltage, the maximally permissible total current of terminals
X4x, X50/X8x is 1 A.
EDS84DPS424 EN 5.0
Supply concept of control voltage
Internal 24 V supply voltage
l
Technical data 4
61