instrument disconnecting device which interrupts the power supply
to the equipment.
It is also recommended that the supply of all the electrical circuits
connected to the instrument must be protect properly, using
devices (ex. fuses) proportionate to the circulating currents.
It is strongly recommended that cables with proper insulation,
according to the working voltages and temperatures, be used.
Furthermore, the input cable of the probe has to be kept separate
from line voltage wiring. If the input cable of the probe is screened,
it has to be connected to the ground with only one side.
Whether the instrument is 12 V version it’s recommended to use
an external transformer TCTR, or with equivalent features, and to
use only one transformer for each instrument because there is no
insulation between supply and input.
We recommend that a check should be made that the parameters
are those desired and that the application functions correctly before
connecting the outputs to the actuators so as to avoid
malfunctioning that may cause irregularities in the plant that could
cause damage to people, things or animals.
3.4 - ELECTRICAL WIRING DIAGRAM
SUPPLY
Pt1000-NTC
DIG.
SPDT 5A-AC1
2
1
TLZ 11 P
C
C
NC
NO
OUT
5
3 4
7
6
SPDT 16A-AC1
NO
C
SPST-NO 16A-AC1
NC
NO
INPUTS
10
8 9
ALARM
12
11
PROBE
INTERNAL
BUZZER
4 - FUNCTIONS
4.1 - MEASURING AND VISUALIZATION
Via the parameter
“SEnS”
it is possible to select the type of
probes that one wishes to use and which can be:
Thermoresistances PT1000 (Pt10) or thermistores NTC PT-24C2
(Entc).
Once the type of probe used has been selected, through the
parameter
“Unit”,
it is possible to select the temperature unit of
measurement (°C or °F) and, through the parameter
“dP”
, the
resolution of the desired measurement (OFF=1°; On =0,1°).
The instrument allows the measuring to be calibrated, that can be
used for re-calibrating the instrument according to application
needs, through the parameters
“OFS”
.
Using the parameter
“FiL”,
it is possible to set the time constant
for the software filter for measuring the input values to be able to
reduce the sensitivity to measurement disturbances (increasing the
time).
4.2 - TEMPERATURE CONTROL
The regulation of the instrument is ON/OFF and acts on the output
“OUT” depending on the measuring of probe, of the Set Point
“SP”
, the intervention differential
“HSEt”
and the function mode
“Func”
.
Depending on the function mode programmed on the parameter
“Func” the differential is automatically considered by the regulator
with positive values for a Refrigeration control (“Func”=CooL) or
with negative values for a heating control (“Func”=HEAt).
In the event of probe error, it is possible to set the instrument so
that that the output “OUT” continues to work in cycles according to
the times programmed in the parameter
“tonE”
(activation time)
and
“toFE”
(deactivation time).
If an error occurs on the probe the instrument activates the output
for the time “tonE”, then deactivates it for the time “toFE” and so on
whilst the error remains.
Programming “tonE” = OFF lthe output in probe error condition will
remain switched off.
Programming instead “tonE” to any value and “toFE” = OFF the
output in probe error condition will remain switched on.
Remember that the temperature regulation function can be
conditioned by the “Compressor Protection” function described
below.
OUT
SP
Temp.
off
ON
HEAt
OUT
time
HSEt
SP
Temp.
HSEt
time
CooL
ON
ON
ON
ON
ON
off
off
off
4.3 - COMPRESSOR PROTECTION FUNCTION AND DELAY AT
POWER-ON
The function “Compressor Protection” carried out by the machine
aims to avoid close start ups of the compressor controlled by the
instrument in cooling applications.
This function foresees a time control on the switching on of the
“OUT” output associated with the temperature regulation request.
The protection consists of preventing the output being switched on
during the time set in the parameter
“PtC”
and counted depending
on what has been programmed in the parameter
“PSC”
, and
therefore that any activation occurs only after the “PtC” time has
finished.
If during the power on delay phase, the regulator request should
disappear, due to an inhibition caused by the compressor
protection function, the foreseen start up of the output is naturally
cancelled
.
Using the parameter
"PSC", it is possible to set the type of
compressor protection and therefore from when the inhibition time
“PtC” must start.
The parameter “PSC” can be set as:
= 1
: Power on delay
T e m p .
O U T
P tC
o f f
O N
S P
P t C
P tC
"P S C " = 1
tim e
H S E t
o ff
o ff
o ff
O N
O N
= 2
: Delay after power off
O N
O U T
o f f
P t C
P tC
P t C
S P
T e m p .
" P S C " = 2
tim e
H S E t
O N
O N
o ff
o f f
= 3
: Delay between power on phases.
P tC
O U T
o ff
S P
O N
T e m p .
P tC
P tC
tim e
H S E t
" P S C " = 3
o ff
o ff
O N
O N
The function is disabled by programming “PtC” = 0.
During the power on delay phases of the OUT output by inhibiting
the function “Compressor Protection” the led OUT flashes.
TECNOLOGIC spa - TLZ 11
P
- OPERATING INSTRUCTIONS - Vr.01 - 09/05 - ISTR 06947 - PAG. 3
