Operating instructions type-lines CXE/AVC (E)
Date 0917
TBL02_13-GB 0917
Art.-Nr. 00153342-GB
Seite 40 / 63
12.4 Sensor Alarm ON / OFF
Function only in controller mode!
For “Analog IN 1” and if activated for sensor 2 Analog IN2. In case of an interruption or short-circuit in the sensor
conductor, or in case of measured values that lie outside of the device’s measurement range, an error message can
occur via the alarm symbol in the display and a relay.
The sensor malfunction indicator is factory set to off so that error messages do not interfere with start-up operations.
When the alarm sensors are set to
OFF,
the sensor malfunctions are stored merely for informational purposes as
“messages” in “Events”.
For Alarm OFF
Message in “Events“
For Alarm ON
Display alternating to actual value
12.5 Limit
An adjustable limitation of the modulation can be activated via a digital input („D1“, „D2“, ..)
(depending on the programming,
as long as no allocation is carried out: Display: - - - - -.
)
IO Setup).
Limit value= max. possible modulation (e.g. speed reduction during night operation by time switch).
Limit value= max. possible modulation
(e.g. speed reduction during night operation by
time switch).
Setting range Limit „Max. Speed“ up to
„Min. Speed“
Factory setting 100 %^ max. modulation, i. e.
no limit.
12.6 Minimum speed cut off
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
1.01
without function!
•
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 disconnection
of the fan takes place. I.e., always a minimum ventilation is
ensured (fan does not go under setting "Min. speed”.
•
Msco
=
ON
It takes place a disconnection from setting "Min. speed” to
"0", if the given difference is reached related to the
desired value. At a plus value (+) before reaching the
desired value at a minus value (-) after falling below the
desired value.
Min. speed
Idealized principle diagram
Max. speed
100
%
50 %
speed
0 50 % 100 %
Speed controller: setting signal
Setpoint
←
Pband
→
P-controller: control deviation
limit
limit 70 %, Min 0 %, Max 100
%
limit 70 %, Min 35 %, Max 85
%
10 K
Pband
Min.
100 %
50 %
modulation
n-min = 35 % n-max = 100 %
Actual
20 °C
Setpoint