Time switch
88
Example:
Time switch with two time programs, each with three time windows
Entire menu view:
DES: TIME
INPUT VARIABLE:
OUTPUT VARIABLE:
Mo
Tu
We
Th
Fr
Sa Su
The first time program is active on all workdays
06.00 - 07.30 h
Switched on on workdays at 06:00 AM and off at 07:30 AM
12.00 - 21.00 h
etc.
00.00 - 00.00 h
Time window not used
Mo Tu We Th Fr
Sa
Su
The second time window is active on the weekend
05.00 - 07.00 h
Switched on at 05:00 AM and off at 07:00 AM
12.00 - 22.00 h
etc.
00.00 - 00.00 h
Time window not used
If using a set value, the following lines appear according to the time matrix:
Set val if TP not
cmpl.: 5° C
Entry of a set value outside the time window, during blockage or
with enable = OFF
If another function uses the blockage input, the following will appear:
Min.time block.cond:
0 Days 5.0 min
The condition has to be met for at least five minutes
Blocking Time:
0 Days 10.0 hr
Then, the time switch is blocked for 10 hours
Legionella protection
is another
example
. Here, the time switch function is used to heat up the
cylinder to 60°C at night to prevent legionella from forming. If this temperature is reached anyway
during the day (such as by the solar system), there is no need of additional heating, and the function
is blocked:
A comparison function (thermostat) at the blocking input lets the first meter run (“Min.time
block.cond”) as long as the cylinder is hotter than 60°C. If the set meter time has been reached (five
minutes), a second time meter blocks the time switch until it has expired (10 hours). The cylinder is
therefore not heated up once again at night using oil, gas, or electricity if the protective temperature
was already reached during the day.
While the time switch is already blocked once the first meter time (“Min.time block.cond ”) has been
reached, the second meter (blocking time of time switch) only begins to run when the blockage input
returns to the status "OFF."
