9.3
Pressure control condensers
3.01
and
3.02
3.01
Pressure control condensers (refrigeration)
3.03
Pressure control condensers (refrigerant technology) with 2 sensors.
Automatic control to the pressure sensor with higher value (for two circuit condensers).
9.3.1
Setting for operation as Pressure controller
%
set
0
100
18.07.2011
v_set_pxet.VSD
Setpoint
For
control with active sensors (0 - 10 V, 4 - 20 mA)
Setting range: 0 - 100 %
measuring range of sensor
19.07.2011
v_pband_pxet.VSD
%
Pband
5
30
Pband
Narrow control range = Short control times
Wide control range = Longer control times and more stable control
For
control with active sensors (0 - 10 V, 4 - 20 mA)
Setting range: 5 - 30 %
5 - 30 % measuring range of sensor
18.07.2011
v_nmin_pxet.VSD
%
n-min
0
100
Minimum output voltage (basic speed)
Setting range: 0 -
“
n-max
”
18.07.2011
v_nmax_pxet.VSD
%
n-max
0
100
Maximal output voltage (speed limiter)
Setting range: 100 % - 0 (takes priority over
“
n-min
”
)
Output voltage depending on load
“
Adjusting of CosPhi for motor
”
.
9.3.2
Example Pressure control condensers
Pressure sensor
•
Type MBG-30I
•
Measuring range 0 - 30 bar
•
Output signal 4...20 mA
Settings
•
set
= 50 % 15.0 bar, in use of refrigerant medium table for R507
•
Pband
= 10 % 3.0 bar
U
Motor
50 %
100 %
[bar] / [°C]
50 %
15 bar ^ 34.28 °C @
507
Set
Pband
10 %
12.03.2008
v_diagramm_bar_c.vsd
18 bar ^ 41.53 °C @ 507
n-min. 0 %, n-max. = 100 %
n-min. 35 %, n-max. = 85 %
Idealized principle diagram
Operating Instructions
Dcontrol
–
model series PKDM6..80
Setting for operation
L-BAL-E143-GB 1914 Index 009
Part.-No.
28/40
