54
Critical collector temperature
If the temperature set in parameter
crit. t.
is exceeded on a solar collector, solar pump is
blocked. This function protects other solar component from destruction by too hot solar fluid.
crit. t. (°C)
................... Solar collector critical temperature.
Solar consumer no. for collector/tank cooling (-)
.................................... No. of solar consumer used for safety functions of collector and tank
cooling.
Solar pump control through PWM
The pump is controlled by PID controller to the desired temperature difference between solar
collector and the active solar consumer. Upon switching the solar pump on the power is set to
maximum for the period defined in parameter purge time, then the speed drops to minimum
and is increased/decreased following the predefined period by the set control step.
solar PWM pump (on/off)
.................................... Switching on the PWM pump function.
set. differ. (K)
............. Desired temperature difference between solar collector and storage
tank.
purge time (mm:ss)
.................................... Purging time (time when pump is running at maximum power after
switching on).
PWM profile (sol., heat.)
.................................... PWM profile according to VDMA standard (default is solar).
min. power (%)
........... Minimum speed of PWM pump.
max. power (%)
.......... Maximum speed of PWM pump.
ctrl.period (s)
.............
Control period of the control algorithm (how often the algorithm
intervenes in the control of the pump).
ctrl.step (%)
................ One control step of the controller (how much will the speed of the pump
be increased/reduced during one control step).
