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54
Function block
In addition to the pre-defi ned optional functions, function blocks consisting of ther-
mostat functions, timer and differential functions are available. With the help of
these function blocks, further components, 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 interconnected (AND gate). This means
that the conditions of all the activated functions have to be fulfi lled (e. g. thermostat
and timer) for switching the allocated relay. As soon as one condition is not fulfi lled,
the relay is switched off.
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 fulfi lled as well.
Allocate the reference sensor in the Sensor channel.
Adjust the maximum temperature limitation with Th(x)off > Th(x)on and the mini-
mum temperature limitation with Th(x)on > Th(x)off. The temperatures cannot be
set to an identical value.
D
T function
The relay allocated to the function block is switched on as soon as the adjust-
ed switch-on temperature difference (
D
Th(x)on) is reached. It is switched off as
soon as the adjusted switch-off temperature difference (
D
Th(x)off) is reached. The
switching conditions of all other activated functions of the function block have to
be fulfi lled as well.
The
D
T function is equipped with a speed control function. A set temperature dif-
ference and a minimum speed can be adjusted. The non-adjustable rise value is 2 K.
Reference relay
Up to 5 reference relays can be selected.
Whether the reference relays are to be switched in series (AND) or in parallel
(OR) can be adjusted in the Mode channel.
OR mode
If at least one of the reference relays is active, the switch-on condition for the
function block is considered fulfi lled. The switching conditions of all other activated
functions of the function block have to be fulfi lled as well.
AND mode
If all reference relays are active, the switch-on condition for the function block is
considered fulfi lled. The switching conditions of all other activated functions of the
function block have to be fulfi lled as well.
Note:
For more information about timer adjustment, see page 11.
Note:
If more than one function block has been activated, relays of numerically
higher function blocks may not be used as reference relays.
Function
Thermostat a
Tha- S3*
Thb-S4
Timer
R3*
RX
D
T-S3>S4*
Thermostat b
D
T function
Timer
Reference relay
Reference relay
1. in parallel (OR)
2. in series (AND)
Reference relay
Reference relay 1
Reference relay 1
Reference relay 2
Reference relay 2
Reference relay 3
Reference relay 3
Reference relay 4
Reference relay 4
Reference relay 5
Reference relay 5
* exemplary selection, sensors and relays can be allocated freely
Relay
Summary of Contents for SC5.14
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