1592002241 XT141C-D GB r1.0 08.07.2016
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8.
PROPORTIONAL FUNCTION
The PID function modulates the activation of the first output using an appropriate ON/OFF cycle:
the duration of the cycle is imposed by the parameter “Cyt”. If the factory set values of the
parameters relating to the PID control are not are not optimised for the process being controlled,
you can utilise the following method to find more appropriate parameter values:
1)
Select ON/OFF control Ft=1.
2)
Impose Set 1 = 10% less than the normal working temperature (as long as it is compatible
with the characteristic of the process being controlled).
3)
Impose the differential Hy1 = 3% of the value of the SET 1.
4)
Start the process from the start up and wait until the temperature control settles and cycles
regularly.
5)
Monitor the process temperature (possibly with a chart recorder) recording the values at
regular intervals. In this way it is possible to determine the time between 2 successive
maximum (Tp) and maximum variations in temperature (dT) see fig.
Values for “Pb”, “Int”, “dEt”, “Cyt” will be obtained by the following method: Pb = 2xdT, Int = Tp/2,
dEt = Tp/8, Cyt = Tp/20.
Other adjustments around these values can be made bearing in mind that:
••••
Proportional action
depends on the deviation between the set point and the relative value.
••••
Derivative action
takes account the speed of the variations of the controlled process.
••••
Integral action
integrates the deviation of the process in time.
NOTE:
An increase of the proportional band reduces the oscillations but increases the deviation, use
“Rs” parameter to adjust the band.
An excessive decrease of the proportional band reduces the deviation but increases the system
oscillations.
A decrease in the value of “Integral action time” leads to an increased incisiveness of the integral
action and annuls the deviation at full speed.
A small but constant deviation can lead to a large contribution of the integral action.
9.
INSTALLATION AND MOUNTING
XT141C
shall be mounted on vertical panel, in a 29x71 mm hole, and fixed using the special
brackets supplied.
To obtain an IP65 protection grade use the
front panel rubber gasket (mod. RG-C).
The temperature range allowed for correct
operation is 0
÷
60 °C. Avoid places subject to
strong vibrations, corrosive gases, excessive
dirt or humidity. The same recommendations
apply to probes. Let air circulate by the
cooling holes.
Instruments
XT141D
shall be mounted on an omega DIN rail.
The temperature range allowed for correct operation is 0
÷
60 °C. Avoid places subject to strong
vibrations, corrosive gases, excessive dirt or humidity. The same recommendations apply to
probes. Let air circulate by the cooling holes.
10.
ELECTRICAL CONNECTIONS
The instruments are provided with screw terminal block to connect cables with a cross section up
to 2,5 mm
2
. Before connecting cables make sure the power supply complies with the instrument’s
requirements. Separate the input connection cables from the power supply cables, from the
outputs and the power connections. Do not exceed the maximum current allowed on each relay,
in case of heavier loads use a suitable external relay.
11.
SERIAL CONNECTIONS
All models can be connected to the monitoring and supervising system XJ500 using the serial
port. The external XJ485 serial module to interface the instrument with the monitoring and
supervising system XJ500 is required.
The standard ModBus RTU protocol it is used.
NOTE: Instruments with current or voltage input and 230V or 115V supply, cannot be
connected to the XJ485 serial module.
12.
HOW TO USE THE HOT KEY
12.1
HOW TO PROGRAM A HOT KEY FROM THE INSTRUMENT (UPLOAD)
1.
Program one controller with the front keypad.
2.
When the controller is ON, insert the “
Hot key
” and push
o
o
o
o
key; the
"uPL"
message
appears followed a by flashing
“End”
3.
Push “
SET”
key and the
End
will stop flashing.
4.
Turn OFF the instrument remove the
“Hot Key”,
then turn it ON again.
NOTE
: the “
Err
” message is displayed for failed programming. In this case push again
o
o
o
o
key if
you want to restart the upload again or remove the “
Hot key
” to abort the operation.
12.2
HOW TO PROGRAM AN INSTRUMENT USING A HOT KEY (DOWNLOAD)
1.
Turn OFF the instrument.
2.
Insert a
programmed “Hot Key” into the 5 PIN receptacle
and then turn the Controller
ON.
3.
Automatically the parameter list of the
“Hot Key”
is downloaded into the Controller
memory, the “
doL
” message is blinking followed a by flashing
“End”.
4.
After 10 seconds the instrument will restart working with the new parameters.
5.
Remove the
“Hot Key”.
.
NOTE
the message “
Err
” is displayed for failed programming. In this case turn the unit off and
then on if you want to restart the download again or remove the “
Hot key
” to abort the operation.
13.
DIGITAL INPUT
XT141C / XT141D has 1 free contact digital input. It is programmable in 5 different
configurations by the “
i1F
” parameter.
13.1
INVERT THE KIND OF ACTION: HEATING-COOLING (I1F = C-H)
This function allows to invert the regulation of the controller for both the outputs: from direct to
inverse and viceversa.
13.2
REMOTE ON/OFF (I1F = OFF)
This function allows to switch ON and OFF the instrument.
13.3
GENERIC ALARM (I1F = EAL)
As soon as the digital input is activated the unit will wait for “
did
” time delay before signalling the
“
EAL
” alarm message. The outputs status don’t change. The alarm stops just after the digital
input is de-activated.
13.4
SERIOUS ALARM MODE (I1F = BAL)
When the digital input is activated, the unit will wait for “
did
” delay before signalling the “
bAL
”
alarm message. The relay outputs are switched OFF. The alarm will stop as soon as the digital
input is de-activated.
13.5
ENERGY SAVING (I1F = HES)
The Energy Saving function allows to change the set point1 value as the result of the SET1+ HES
(parameter) sum. This function is enabled until the digital input is activated.
14.
ALARM SIGNALS
Message
Cause
Outputs
“PFo”
Probe broken or absence
Alarm output ON; Output 1 and 2 according
parameters “So1” and “So2” respectively.
“PFc”
Probe short circuited
Alarm output ON; Output 1 and 2 according
parameters “So1” and “So2” respectively.
“HA”
Maximum temperature alarm Alarm output ON; Other outputs unchanged.
“LA”
Minimum temperature alarm Alarm output ON; Other outputs unchanged.
“EAL”
External alarm
Output unchanged.
“bAL”
Serious external alarm
Output OFF.
14.1
ALARM RELAY STATUS
Status of the instrument
AS = CL
AS = oP
Instrument off
5-6 closed
5-6 closed
Normal operating
5-6 closed
5-6 open
Alarm present
5-6 open
5-6 closed
14.2
SILENCING BUZZER / ALARM RELAY OUTPUT
Once the alarm signal is detected the buzzer, if present, can be disabled by pressing any key.
The alarm relay status depends on the tbA parameter: with tbA=yES the relay is disabled by
pressing any key, with tbA=no the alarm relay remains enabled as long as the alarm lasts. The
display signal remains as long as the alarm condition remains.
14.3
ALARM RECOVERY
Probe alarms “
PFo
”, “
PFc
” start few seconds after the fault in the probe; they automatically stop
few seconds after the probe restarts normal operation. Check connections before replacing the
probe.
Max. and min. alarms “
HA
” and “
LA
” automatically stop as soon as the variable returns to normal
values.
Alarms “
bAL
” and
“EAL”
recover as soon as the digital input is disabled.
15.
TECHNICAL DATA
Housing:
self extinguishing ABS.
Case: XT141C
frontal 32x74 mm; depth 60mm;
XT141D:
4 DIN modules 70x85 mm; depth
61mm.
Mounting:
XT141C
panel mounting in a 71x29 mm panel cut-out;
XT141D:
DIN RAIL
Protection:
IP20.
Frontal protection:
IP65 with frontal gasket RG-C (optional).
