Siemens S5-135U/155U Case of a fault, the red LED ªFan Faultº lights up, Terminals Cabling

Central Controllers and Expansion Units Power Supply Units

Selecting Cables The following applies to selecting the cables for the terminals:

Terminals		Cabling
Power supply AC line	Phase	L 1
	Neutral	N
	Protective conductor
Relay terminals, also suitable
to 230 V AC / 3 A

Max. Permissible Cable

Cross-Sections

4 mm2 solid or 2.5 mm2 flexible

4 mm2 solid or 2.5 mm2 flexible

4 mm2 solid or 2.5 mm2 flexible

4 mm2 solid or 2.5 mm2 flexible

Installing and

Removing the Fan

Submodule

Wiring up the Fan Submodule

Switching on the Fan Submodule for the First Time

!

Fault Indications/ Fault Diagnostics

For installing and removing the fan submodule, refer to the instructions in Section 4.3.2 on the power supply unit. These also apply in principle here.

FFor wiring up the fan submodule, refer to the instructions in Section 4.3.2 on the power supply unit. These also apply in principle here.

The fan submodule is switched on when the line voltage for the central controller or expansion unit is switched on.

Caution

If you have set the voltage selector switch on the -3LA11 to 120 V, but the actual voltage value is 230 V, the fan submodule may be damaged when line voltage is switched on.

Fan submodule faults are indicated via relay contacts (ªMonitor Outputº) and an LED.

The following table shows when the relay contacts are open or closed:

Fan Submodule	Relay Contact 1-2	Relay contact 2-3
Switched off	open	closed
In normal operation	closed	open
During fault	open	closed

In the case of a fault, the red LED ªFan Faultº lights up.

System Manual	4-73
C79000-G8576-C199-06