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34. Regulation (Model TH-4xxSx1)
All the graphics below refer to automatic speed control.
The fan is a 3 speed on/off model, the outputs are defined as follows:
- digital output
DO3
for speed 1
- digital output
DO4
for speed 2
- digital output
DO5
for speed 3
Parameters
I29
,
I30
,
I31
,
I32
and
I33
are not used in this type of regulation.
• HEATING mode (
M01
=0)
The “
HEAT
” icon is on to indicate that heating mode is active.
The regulation logic is as follows:
speed 1
Fan
speed 3
BHS
(
I07
)
speed 2
(
I26
)
(
I27
)
ON
OFF
Temp.
HH
(
I18
)
Output
Temp.
FB
DO5
DO4
DO3
DO1
- Operation with
M02
=0 or 2 (digital output
DO1
does not control an electric resistance).
If the operating temperature drops below
I07
- (
I18
: 2) relay
DO1
is activated and the fan starts at speed 1 after startup
delay
I36
.
If the temperature continues to fall, the speeds switch as follows:
- speed 1 to speed 2, when the temperature drops below
I07
- (
I18
: 2) - [
I26
x (FB -
I18
)],
- speed 2 to speed 3, when the temperature drops below
I07
- (
I18
: 2) - [
I27
x (FB -
I18
)].
The icon turns on to indicate that heating is active.
If the operating temperature increases to
I07
- (
I18
: 2) the speed remains constant at speed 1, until the operating tem-
perature exceeds
I07
+ (
I18
: 2).
At this point, icon turns off and, depending on the value of parameter
I28,
the fan either stops or continues running:
if
I28
=0 o 2, the fan stops,
if
I28
=1 or 3, the fan stays on at speed 1.
if
I28
=4 or 6, the fan stays on at speed selected manually.
- Operation with
M02
=1 or 3 (digital output
DO1
controls an electric resistance).
If the operating temperature drops below
I07
- (
I18
: 2) relay
DO1
is activated and the fan starts immediately at speed 1
regardless of the startup delay
I36
.
If the temperature continues to fall, the speeds switch as follows:
- the speed switches from speed 1 to speed 2 when the temperature drops below
I07
- (
I18
: 2) - [
I26
x (FB -
I18
)],
- the speed switches from speed 2 to speed 3 when the temperature drops below
I07
- (
I18
: 2) - [
I27
x (FB -
I18
)].
Icons and
turn on to indicate heating active with electric resistance.
If the operating temperature increases to
I07
- (
I18
: 2) the speed remains constant at speed 1, until the operating tem-
perature exceeds
I07
+ (
I18
: 2).
Icons and
now turn off and, depending on the value of
I28,
the fan turns off after delay
I35
or stays on for air re-
circulation:
if
I28
=0 or 2, the fan stops after delay
I35
.
if
I28
=1 or 3, the fan stays on at speed 1.
if
I28
=4 or 6, the fan stays on at speed selected manually.
