6.3 Fan release / ALM OFF
This function uses a free switching output of the RLU2… (e.g. Q1) for fan release
ALM OFF.
Function and non-
switch off conditions
The fan is released when no alarm is present, that is, with alarm OFF (when ALM
OFF = YES, that is, when the switching output is energized). This is the case when:
• No frost alarm FROST is pending
• There is no fault of the main controlled variable MAINALM
• The controller is not using the COMMIS (commissioning) menu
Use the switching output for changeover (see connection diagram below),
whereby:
Recommendation
• Switching relay deenergized:
Fault status message (frost or fault of main controlled variable), fan OFF
• Switching relay energized:
Fan released
This application example shows a fan controlled by a time switch (switching on /
off):
Connection diagram
Q11
Q14
G0
N1
AC 24 V
M
AC 230 V
K2
Q11
Q14
Q12
K2
Fan
H1
K2
RLU232
• The time switch determines the controller’s operating mode via relay K2 at
operating mode input D1 (Comfort or Protection). The controller provides for
changeover of operating mode or setpoints
• The time switch switches the fan via relay K2
• In the event of fault (frost, sensor error), the controller disconnects the fan from
power and triggers an acoustic alarm (H1)
The fan release function is activated by assigning relay Q1 to the respective output
on submenu MODE under ALM OFF (fan release relay / alarm OFF).
Activation of function
34 / 174
Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Operating modes 29.08.2008
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