7.5
Minimum speed cut off DIP 5
7.5.1
For mode Speed controller
1.01
If no
“
n-min
”
is adjusted,output voltage goes continuously with reduction of the regulating variable
down to
“
0
”
(cutoff below approx. 2 % regulating variable).
Without minimum speed cut OFF (DIP 5 =
|
OFF
|
= factory setting)
•
If minimal speed
“
n-min
”
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
“
n-min
”
).
With minimum speed cut off (DIP 5 =
|
ON
|
)
•
Cutoff below approx. 2 % regulating variable from sestting
“
n-min
”
to
“
0
”
.
•
Switch on again for a regulating variable above 5 % (to setting
“
n-min
”
).
Functional diagram see setting for operation as Speed controller
7.5.2
For operation as P-Controller, PI-Controller
2.01
,
3.01
,
4.01
This function is primarily signi
fi
cant for installation of the device as a pure
P-Controller
(
2.01
,
3.01
).
Without minimum speed cut OFF (DIP 5 =
|
OFF
|
=
factory setting)
•
If no
“
n-min
”
is adjusted, the fan stops with
reaching the desired value.
•
If
“
n-min
”
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
“
n-min
”
).
With minimum speed cut off (DIP 5 =
|
ON
|
)
•
When the setpoint is reached, the modulation is
reduced to
“
0 %
”
, or to the set value if
“
n-min
”
is
speci
fi
ed.
•
For actual value = setpoint disconnection takes
place from
“
n-min
”
to
“
0
”
. Hysteresis (ON / OFF)
approx. 2.5 % of 100 % set value.
nM
50 %
100 %
I
Min.
Min. 35 %
Max. = 100 %
20 °C
S
7 K
R
27 °C
-2.0 K
10.05.2007
v_min_luft_abschalt.vsd
Minimum speed cut off (idealized principle diagram)
nM
Motor speed
S
Setpoint
R
Pband
I
Actual value
7.6
Hardstart function DIP 6
Special function for motorstart with maximum output voltage.
DIP 6 =
|
OFF
|
“
Hardstart
”
function = OFF (factory setting).
After switching the mains voltage on the output voltage rises during the
fi
rmly programmed
run-up time to the given value.
DIP 6 =
|
ON
|
“
Hardstart
”
function = ON.
For a safe starting of the connected fans the function
“
Hard start
”
can be activated.
After switching on (line voltage or enable via digital input
“
D1
”
) the controller generates for
approx. 10 seconds max. voltage
“
100 %
”
ignoring any control or sensor signal.
Afterwards the output voltage adjusts itself to the given or over the control ampli
fi
er calculated
value.
For operation as controller(from mode
2.01
) the
“
Hard start
”
function works also by switching
over the control function (
“
Heating
”
/
“
Cooling
”
).
Operating Instructions
Acontrol
–
model series PXET6Q / PXET10Q
Base setup
L-BAL-E016-GB 1925 Index 007
Part.-No.
17/32
