Siemens S5-135U/155U - Manual (Page 136)

4-70
System Manual
C79000-G8576-C199-06
4.5 Fan Submodules
4.5.1 Technical Description
The fan submodule variants 6ES5 988-3LA11 (230 V AC) and
6ES5 988-3NA11 (24 V DC) are described in the following section.
A fan submodule has the following function:
S
Heat dissipation
The fan submodule dissipates any excess heat created in the central
controller or expansion unit.
The following terminals and LEDs are fitted on the front plate (the front
plate of the -3LA11 is shown as an example):
6ES5
988-3LA1
1
AC 230V
CAUTION!
Disconnect
before
removing
Voltage selector
inside the unit!
AC line
L1 N
SIEMENS
Monitor Output
Use copper wire 60/75 ° C only!
Tightening torque: terminals 0,8Nm/ 1,8 Nm
Fan
Fault
Relay max.
250V AC/3A
1 3 2
power supply!
12
3
45
67
8
91
0
ID Label Element Purpose
1 Protective conductor terminal for fan submodule and housing.
2 ZStrain reliefs for connecting cables, with metal contact surface for cable
shields.
3 230V AC Screw
terminals
L1, N AC connection
(details for -3LA11)
24V DC Screw
terminals + – 24 V DC supply
(details for -3NA11)
4 Monitor Output Relay output Standstill of one or both fans is signaled via LED and relay contact.
5 Fan Fault Red LED The LED lights up to indicate a fan fault.
Connections and
LEDs
Central Controllers and Expansion Units Power Supply Units