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6.5
Cut-off function
When the output of the controller decreases until reaching the minimum value set, the output is forced to zero and remains at this value until the conditions require an
output value that is greater than or equal to the minimum value set.
The change from the minimum output to zero output and vice-versa is performed using an hysteresis, so as to avoid unwanted fluctuations. The hysteresis can be set
by parameter (default 2% of the operating range of the probes)
By default the function is associated with the position of dipswitch 4.
Dipswitch
Function
Dip4
enable the function selected by par. DIP4 (default Cut-off)
The status of dipswitch 4 has priority over the parameter that enables the associated function.
Associated parameters
par.
Spv
Modb
ECOF
D3
3
COFH
I12
112
DIP4
I20
120
6.6
Output saturation function
If the maximum output set is less than the maximum possible (100% is equivalent to the full mains voltage), when the control output increases until reaching the maximum
value set, the output is forced to the maximum possible and remains there until the conditions require an output value that is less than or equal to the maximum value set.
The change from the maximum output set to maximum output possible and vice-versa is performed using an hysteresis, so as to avoid unwanted fluctuations. The
hysteresis is 2% of the operating range of the probes. By default the function is disabled (alternatively, its status can be set using dipswitch 4).
Associated parameters
par.
Spv
Modb
ESMX
D4
4
6.7
Speed-up function
When the output of the controller changes from zero to value greater than or equal to the minimum value set, the output is forced to the maximum value possible for a time
set by parameter (default 2 seconds). At the end of this time, the output returns to the required value, following the set ramp. The function has the purpose of overcoming
the inertia of the fans, allowing them to operate at low speeds that otherwise would not be possible when starting from standstill. By default the function is enabled
(alternatively, its status can be set using dipswitch 4).
Associated parameters
par.
Spv
Modb
SUPT
I13
113
STEP
I24
124
ESUP
D2
2
Code +030220391 – rel 1.1 07/11/06
CUT-OFF Off
OUT
100%
max
min
setp
range
def
uom
0/1
0
1
2 to 100
2
1%
0 to 8
1
1
SATMAX Off
OUT
100%
max
min
setp
range
def
uom
0/1
0
1
range
def
uom
1 to 5
2
1sec
0 to 10
1
1sec
0/1
1
1
CUT-OFF On
OUT
100%
max
hyst
min
100%
setp
Fig. 6.b
OFF:
function disabled (default)
ON:
function enabled
description
Cut-off function
Cut-off activation hysteresis
Function associated with dipswitch 4
OUT
100%
max
min
100%
setp
Fig. 6.c
description
Saturation function
description
Speed-up duration
Output ramp (minimum time for variation from 0% to 100%)
Function Speed-up
16
100%
0=disabled
1=enabled
0=no function
1=Cut-off
2=Speed-up
3=Output saturation
4=Long impulse phase control
5=Reverse mode
6=Slave mode 1
7=Slave mode 2
8=Slave mode 3
SATMAX On
100%
0=disabled
1=enabled
0=disabled
1=enabled
FCP manual
Table 6.a.or
Table 6.a.p
Table 6.a.q
Table 6.a.r
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