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BETA Switching
Timers
7
LF6, 5TT1 3 timers for buildings
9/18
Siemens ET B1 · 10/2008
9
■
Schematics
Switching example: 7LF6 111 timer in 4-wire circuit,
L-momentary contact, resettable
Typical circuit for new installation with separate cable routing for
pushbuttons and lights. The additional DI switch allows external
switching to continuous light. A time switch can also be used.
An additional attic circuit is also available, which operates
independently of the timer, but on the same electrical circuit.
The timer can be restarted before the set time expires.
t
e
= runtime
Switching example: 7LF6 111 timer in 3-wire circuit,
N-momentary contact, resettable
Can only be used with a limited number of wires. The timer can
be restarted before the set time expires. While this 3-wire circuit
with N-momentary contact is technically possible, it does not
comply with DIN VDE 0100-460. However, it is used in old
systems for replacement purposes.
t
e
= runtime
Switching example: 7LF6 112 timer for fans up to 200 VA
The switch switches the light on immediately, e.g. in a toilet. After
a delay of approx. 1 minute, the fan is switched on. When the
light is switched off, the fan continues to run for the time set at
the timer.
t
e
= runtime
Switching example: 7LF6 115 energy-saving timer with
advance warning
The timer is connected in the same way as the 7LF6 111 timer in
a 4-wire circuit or 3-wire circuit. The energy-saving timer
switches on if pressed once and switches off when it is pressed
again. If it is not switched off manually, it is automatically
switched off after the set time, or max. 60 minutes. 20 and
40
seconds before expiry, the light flashes briefly twice (50 ms)
to warn of the impending switch-off. This allows time to reset the
switch while the light is still on. Prior to the warning time, a push
of the button ends the timing interval.
t
e
= runtime
Switching example: 7LF6 110 timer in 3-wire circuit,
L-momentary contact, resettable
Circuit for new installation with shared cable routing for pushbuttons
and lights. The timer can only be restarted after the set time
expires.
t
e
= runtime
Switching example: 7LF6 113 timer with advance warning
The timer is connected in the same way as the 7LF6 111 timer in
a 4-wire circuit or 3-wire circuit. 20 and 40 seconds before expiry,
the light flashes briefly twice (50 ms) to warn of the impending
switch-off. This allows time to reset the switch while the light is
still on.
t
e
= runtime
I2_10916a
L2
e
e
e
N
DE
L N
2 1
L
I2_10912a
230
V AC
I2_10917a
L2
e
e
e
N
L
L N
2 1
I2_10913a
230
V AC
N
L
L N
2 1
I2_10914a
230
VAC
!
N
L
2
N
L
I2_10915a
230
V AC
© Siemens AG 2008