● Observe the wiring rules.
● The maximum cross-section of the connection is 2.5 mm
2
. A strain relief is not present.
Note
Diagnostics of the redundant power supply
Diagnostics can be enabled for the redundant power supply in the commissioning wizard of the
CFU. You can find information on this in section "Using a wizard for CFU configuration
(Page 72)".
Requirements
● The plugs are available (X80 or X81, section "Article numbers (accessories / spare parts)
(Page 181)").
● Only wire the plugs when the power supply is switched off.
● Observe section "Wiring rules (Page 55)".
Tools required
You need a screwdriver with a 3 mm to 3.5 mm blade width to loosen or connect cables.
Fastening the cable to the plug
You can find information on connecting the cables in section "Selecting connection system
(Page 62)".
Slot for the power supply of the CFU
Insert the plug into the CFU (X80 or X81).
Display of the supply voltage
The "PS1" and "PS2" LEDs indicate whether a power supply is connected (see section
"Diagnostics via LED displays (Page 107)“):
● X80: "PS1" LED lights up green
● X81: "PS2" LED lights up green
Removing a wire
Plug with screw-type terminals Plug with push-in terminals
1. Open the terminal with the
screwdriver.
2. Remove the cable from the plug.
1. Using the screwdriver, press the spring opener as far as
it will go and pull the cable out the terminal.
2. Pull the screwdriver out of the spring release.
Connecting
7.3 Connecting the power supply to the CFU
SIMATIC CFU
58 Commissioning Manual, 08/2019, A5E39252870-AD
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