57
In addition to the pre-defined optional functions,
function blocks consisting of thermostat functions,
timer and differential functions are available. With
the help of these function blocks, further compo-
nents, resp. functions can be controlled.
to each function block, sensors and free relays can
be allocated. sensors already in use can be allocated
again without impeding their control functions.
Within a function block the functions are intercon-
nected (anD gate). this means that the conditions
of all the activated functions have to be fulfilled (e.
g. thermostat and timer) for switching the allocated
relay. as soon as one condition is not fulfilled, the re-
lay is switched off.
Function block
Function
Function block 1
Relay
3
Thermostat
thermostat a- S3
thermostat b- S4
Differential function
∆
T
∆
T
Sen. 1
Sen. 2
Timer
Timer
tha-s3
thb-s4
t-s3>s4
timer
r3
Thermostat function
the relay allocated to the function block is switched
on, when the adjusted switch-on temperature (th(x)
on) is reached. It is switched off when the adjusted
switch-off temperature (th(x)off) is reached. the
switching conditions of all other activated functions
of the function block have to be fulfilled as well.
allocate the reference sensor in the
Sensor
channel.
adjust the maximum temperature limitation with
th(x)off> th(x)on and the minimum temperature
limitation with th(x)on> th(x)off. the temperatures
cannot be set to an identical value.
∆
T function
the relay allocated to the function block is switched
on as soon as the adjusted switch-on temperature
difference (
Δ
th(x)on) is reached. It is switched off
as soon as the adjusted switch-off temperature dif-
ference (
Δ
th(x)off) is reached. the switching condi-
tions of all other activated functions of the function
block have to be fulfilled as well.
the
Δ
t function is equipped with a speed control
function. a set temperature difference and a mini-
mum speed can be adjusted. the non-adjustable rise
value is set to 2 K.
295931-36390-8667 SOM 8 plus_en.indb 57
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