Limit; Minimum Switch-Off - Helios EUR EC Instructions D'installation Et D'utilisation

Installation and Operating Specification EUR EC
9.8.5

Limit

Controller Setup
- - - - -
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 %
e. no limit.
Setting depending on device tye in: % or rpm.
9.8.6

Minimum switch-off

Controller Setup
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.
L-BAL-E274-GB 1914 Index 003
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 influences both outputs in operation with two control circuits.
max. modulation, i.
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
This function is primarily significant for installation of the device as a pure P Controller
in refrigeration and air-conditioning technology.
For operation mode speed controller
Display for operation with two control circuits:
"1. Minimum switch-off" for control circuit 1
"2. Minimum switch-off" for control circuit 2
Part.-No.
49/117
100
90
80
L
70
60
50
40
Min.
30
20
10
0 % 50 %
I
S R
1.01
without function!
90
80
70
60
50 -2.0 K
40
Min.
30
20
10
20 °C
7 K
S
Minimum 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
Programming
| |
- - - -
L= 70% Min.= 0 % Max. = 100 %
L = 70% Min. = 35 % Max. = 85 %
100 % D
I
P
28.03.2013
v_limit_cxe_master.vsd
Min. 35 % Max. = 100 %
I
28.03.2013
27 °C
v_min_luft_abschalt_cxe_master.vsd
R