5.8 Control parameters, circulation pump(s)
Control parameters for circulation pump(s), applications
A333.2 / A333.3
The circulation pumps P1 / P2 can be speed controlled by means of
a 0 - 10 volt signal. The speed control signal comes from the output
M3 (terminals 61 and 56) on the ECA 32 module.
A desired pressure difference between S9 and S10 is set for the
speed control procedure.
The control voltage is expressed as a % value and displayed at the
M3 symbol.
When the pressure difference gets lower than the desired pressure
difference, the control voltage is gradually increased in order to
increase the speed of the circulation pump more than the moment
before. By this, the pressure difference aligns with the desired
pressure difference.
The control voltage remains on a fixed value as long as the pressure
difference corresponds to the desired pressure difference.
The control voltage can be limited to a maximum. and a minimum
% value.
MENU > Settings > Control parameters, circulation pump(s)
Pressure diff. (A333.2 / A333.3)
12322
Circuit
Setting range
Factory setting
1
0.1 . . . 5.0 bar
1.5 bar
Setting of desired pressure difference between S9 and S10 in order to speed
control the circulation pump(s) P1 / P2.
0.1 - 5.0:
Set the desired pressure difference between S9 and
S10 (in bar)
X
= Time
Y
= Pressure
# 1 # = Pressure diff., desired
# 2 # = Actual pressure difference
# 3 # = Neutral zone, Nz
# 4 # = Speed control signal (0 - 10 V)
VI.GU.T2.02
© Danfoss | 2017.09 | 97
Operating Guide ECL Comfort 310, application A333
