Solar working station operation manual SR881
- 32 -
4.5.2 nMIN Solar circuit pump speed adjusting
（
RPM speed controlling
）
Description:
P1 output can be configured to function either as RPM controlled output or simple switch
output. When this function is activated, the output is RPM controlled output; when parameter
is set as “nMIN”100%” the output becomes a normal switch output.
Normal switch output
: circuit pump speed controlling is deactivated, pump is operated with
a fixed speed, and flow rate is not changed.
RPM control output:
(speed controlling is activated), the control system attempts to
maintain a constant temperature difference between collector and tank. The pump
performance is continuously adjusted and the volume flow of pump is increased or reduced,
depending on the temperature difference.
Setup steps
:
To access main menu FUN, then select submenu nMIN, “nMIN 30” displays on screen.
►Press “SET” button, parameter “30” blinks on the
screen
►Press “+”“―” button, to adjust speed of circuit pump,
adjustable range (30
～
100%), factory set is 30%
► Press “ESC” button to exit the menu or wait for 20 seconds to exit automatically,
parameters are saved automatically.
4.5.2.1 DTS Standard temperature difference
（
for circuit pump’s speed adjusting
）
Description:
When the switch-on temperature difference (
△
T ON) reaches, solar pump is triggered, and
then within 20 seconds, pump speed reaches to its minimum speed (30%). Whereafter,
controller checks continuously, when the standard temperature difference (DTS) reaches,
the speed of pump increases one grade (10%), temperature difference RIS increases every
1
o
C, speed of pump increases 10% until it reaches to its maximum speed 100%. Through
setting the temperature difference increase rate (RIS) can achieve the controlling of pump
speed. If temperature difference drops to the switch-off TD (
△
T OFF), circuit pump is
ceased.
