Assembly and connecting
CX50x0 27Version: 1.9
UL requirements
DANGER
Compliance of the UL requirements
For the compliance of the UL requirements the CX-Controllers should only be supplied by a 24 VDC supply
voltage, supplied by an isolating source and protected by means of a fuse (in accordance with UL248),
rated maximum 4 Amp.by a 24 VDC power source, that has to satisfy NEC class 2. A NEC class 2 power
supply shall not be connected in series or parallel with another (class 2) power source!This UL require-
ments are valid for all supply voltages of the CX-Controllers!
DANGER
Compliance of the UL requirements
To meet the UL requirements, the CX-Controllers must not be connected to unlimited power sources!
Power contact PE
NOTE
Powerkontakt "PE"
The “PE” power contact must not be used for other potentials. "PE" und "0V" (24V CX-System supply) have
to be on the same potential. (connected in the cabinet) The wiring the cabinet has to follow the Norm EN
EN 60204-1:2006: Safety of machinery - Electrical equipment of machines - (PELV = Protective Extra Low
Voltage) EN 60204-1:2006 chapter 6.4.1:b): One side of the circuit or a point of the energy source of the
circuit must be connected to protective earth system
NOTE
Interrupt power supply / switching off
If the power supply should be disconnected the "0V" must not be disconnected. Always disconnect the
“24V” wire first. Otherwise there can be electrical current flow via the shield. Possibly connected devices
with own power supply (e.g. panel) must have the same electrical potential for "PE" and "GND" as the CX-
unit. Otherwise the CX-unit and/or the connected device can be damaged.
Also see about this
2 Mounting of passive terminals to the power supply of CX50x0 [}28]
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