9.9.6
Minimum speed cut off
Controller Setup
This function is primarily signi
fi
cant for installation of the device as a pure P Controller
in refrigeration and air-conditioning technology.
For operation mode speed controller
1.01
without function!
Display for operation with two control circuits:
“
1. Min. speed cut off
”
for control circuit 1
“
2. Min. speed cut off
”
for control circuit 2
OFF
Min. speed cut off
Msco = OFF
(factory setting)
If no
“
Min. speed
”
is adjusted, the fan stops with
reaching the desired value.
If
“
Min. speed
”
is adjusted (e.g. 20%), then no dis-
connection of the fan takes place. I.e., always a
minimum ventilation is ensured (fan does not go
under setting
“
Min. speed
”
).
Msco. e.g. -2.0 K
It takes place a disconnection from setting
“
Min.
speed
”
to
“
0
”
, if the given difference is reached re-
lated to the desired value.
At a plus value (+) before reaching the desired value
At a minus value (-) after falling below the desired
value.
I
Min. 35 %
Max. = 100 %
20 °C
S
7 K
R
27 °C
-2.0 K
28.03.2013
v_min_luft_abschalt_cxe_master.vsd
80
70
60
50
40
30
20
10
90
A
n
a
lo
g
O
u
t
[V
]
1
2
3
4
5
6
7
8
9
1
0
M
O
D
B
U
S
O
u
t
[%
]
Min.
Minimum speed cut off (idealized principle diagram)
MODBUS Out:
speed setting over MODBUS
Analog Out:
speed setting over analog output 0 - 10 V
S
Setpoint
R
Pband
I
Actual value
9.9.7
Reverse action of the control function
Controller Setup
For the effect of the regulation there are two functions:
•
ON
for
“
Val>Set=n+
”
increasing Fanlevel for increasing actual value over
Setpoint.
•
OFF
for
“
Val>Set=n+
”
increasing Fanlevel for decreasing actual value below
Setpoint.
Display for operation with two control circuits:
“
1. Actual>Set=n
”
for control circuit 1
“
2. Actual>Set=n
”
for control circuit 2
For special applications an external switch over of the control function is possible (
IO Setup).
ON
Val>Set=n+
Factory setting depending
on selected mode
Example for temperature control (Idealized principle diagram)
Operating Instructions
UNIcon MODBUS Master
Programming
L-BAL-E207-GB 1723 Index 003
Part.-No.
55/114