Saia-Burgess Controls AG
Hardware manual for PCD3 series │ Document 26-789 ENG19│ 2018-06-29
Power supply and connection plan
PCD3.Mxxx0 Classic CPU and expansion enclosure
3-24
3
3.9
Power supply and connection plan
Difference external and internal power supply
●
External
External power supply means the feeding of the inputs and outputs at the
terminal block of the respective module or compact CPU, (analog, relay,
transistor etc.). This common method allows far higher currents than would
be possible within the controller and does not necessarily require qualitative
stabilization.
●
Internal
Internal power supply means the supply of the CPU, RIOs and the switching
electronics of the I/O plug-in modules without inputs/outputs on the terminal
block of the module. The advantage of the internal supply unit is its more
advanced processing and therefore the quality of the DC voltage as it would
have to been supplied via the external, since the user does not have to worry
about the quality of a clean power supply. Except for fast counter and stepper
motor modules of type PCD3.Hxxx.
3.9.1
External power supply
Simple little installations
+18V
0V
GND
L N
19VAC
±15%
Trafo min. 50VA
●
Sensors: Electromechanical switches
●
Actuators: Relays, lamps, small valves with switching currents <0.5A
●
Suitable for PCD3.Mxxxx module:
PCD3.E1xx, E5xx, E6xx, A2xx, A4xx, B1xx,
PCD3.W1xx, W2xx, W3xx, W4xx, W5xx, W6xx