9.9.5
Limit
Controller Setup
After allocation of a digital input (see IO Setup) an adjustable limitation of the modu-
lation can be activated via a digital input (
“
D1
”
,
“
D2
”
, ..).
Display as long as no allocation has been carried out in
“
IO Setup
”
:
|
- - - -
|
The limitation in
fl
uences both outputs in operation with two control circuits.
- - - - -
Limit
“
Limit value
”
= max. possible modulation (e.g.
speed reduction during night operation by
time switch).
Setting range:
“
Limit
”
=
“
Min. Speed
”
to
“
Max.
Speed
”
.
Factory setting: 100 %
max. modulation, i.
e. no limit.
Setting depending on device tye in: % or rpm.
D
P
Min.
L= 70% Min.= 0 % Max. = 100 %
50 %
R
0 %
I
S
100 %
I
L
L = 70% Min. = 35 % Max. = 85 %
28.03.2013
v_limit_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
[%
]
100
Limit (idealized principle diagram)
MODBUS Out:
speed setting over MODBUS
Analog Out:
speed setting over analog output 0 - 10 V
L
Limit
S
Setpoint
R
Pband
D
Speed controller: setting signal
P
P-controller: control deviation
9.9.6
Minimum switch-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. Minimum switch-off
”
for control circuit 1
“
2. Minimum switch-off
”
for control circuit 2
OFF
Min. switch-off
Minimum switch-off = 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
”
).
Minimum switch-off, 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
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v_min_luft_abschalt_cxe_master.vsd
80
70
60
50
40
30
20
10
90
A
n
al
o
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
Operating Instructions
UNIcon MODBUS Master
Programming
L-BAL-E255-GB 1901 Index 001
Part.-No.
55/121