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LTR-5 INSTRUCTIONS FOR USE
Thank you for having chosen a LAE electronic product. Before installing the instrument, please read these instructions carefully
to ensure maximum performance and safety.
DESCRIPTION
INDICATIONS
Thermostat output
Fig.1 — Front panel
Setpoint button.
Increase button.
Decrease button.
Exit / Stand-by button.
INSTALLATION
Insert the controller through a hole measuring 71x29 mm.
Make sure that electrical connections comply with the paragraph "wiring diagrams". To reduce the effects of electromagnetic
disturbance, keep the sensor and signal cables well separate from the power wires.
Fix the controller to the panel by means of the suitable clips, by pressingly gently; if fi tted, check that the rubber gasket
adheres to the panel perfectly, in order to prevent debris and moisture infi ltration to the back of the instrument.
Place the probe T1 inside the room in a point that truly represents the temperature of the stored product.
OPERATION
DISPLAY
During normal operation, the display shows either the temperature measured or one of the following indications:
OFF
Controller in stand-by
E1
In tuning: timeout1 error
Probe T1 overrange or failure
In tuning: timeout2 error
OR
E2
TUN / 5.4 Controller in autotuning
E3
In tuning: overrange error
SETPOINT (display and modifi cation of desired temperature value)
press button
for at least half second, to display the setpoint value.
By keeping button
pressed, use button
or
to set the desired value (adjustment is within the minimum SPL and the
maximum SPH limit).
When button
is released, the new value is stored.
STAND-BY
Button
, when pressed for 3 seconds, allows the controller to be put on a standby or output control to be resumed (with
SB=YES only).
CONTROLLER AUTOTUNING IN PID MODE
Before starting
Adjust the setpoint 1SP to the desired value.
Set 1Y=PID.
Make sure that the 1PB value matches the desired control mode (1PB<0 for heating; 1PB>0 for refrigeration).
Start autotuning
Keep buttons
+
pressed for 3 seconds. 1CT blinks on the display.
With
+
or
set the cycle time in order to defi ne the dynamic of the process to be controlled.
To start autotuning press
+
or wait for 30 seconds. To abort the autotuning function, press
During autotuning
During the entire autotuning phase, the display alternates
with the actual temperature measured.
In case of power failure, when power is resumed, after the initial autotest phase, the controller resumes the autotuning
function.
To abort the autotuning, without modifying the previous control parameters, keep button
After the autotuning has taken place successfully, the controller updates the control parameters and start to control.
Errors
If the autotuning function failed, the display shows an error code:
E1 timeout1 error: the controller could not bring the temperature within the proportional band. Increase 1SP in case of
heating control, vice versa, decrease 1SP in case of refrigerating control and re-start the process.
E2 timeout2 error: the autotuning has not ended within the maximum time allowed (1000 cycle times). Re-start the autotuning
process and set a longer cycle time 1CT.
E3 temperature overrange: check that the error was not caused by a probe malfunction, then decrease 1SP in case of heating
control, vice versa increase 1SP in case of refrigerating control and then re-start the process.
To eliminate the error indication and return to the normal mode, press button
X
.
Control improvement
To reduce overshoot, reduce the integral action reset 1AR.
To increase the response speed of the system, reduce the proportional band 1PB. Caution: doing this makes the system less
stable.
To reduce swings in steady-state temperature, increase the integral action time 1IT; system stability is thus increased,
although its response speed is decreased.
To increase the speed of response to the variations in temperature, increase the derivative action time 1DT. Caution: a high
value makes the system sensitive to small variations and it may be a source of instability.
RECALIBRATION
Have a precision reference thermometer or a calibrator to hand.
Ensure that OS1=0 and SIM=0.
Switch the controller off then on again.
During the auto-test phase, press buttons
X
+
, and keep them pressed till the controller shows 0AD.
With buttons
and
select 0AD or SAD: 0AD allows a calibration of 0, inserting a constant correction over the whole
scale of measurement. SAD allows a calibration of the top part of the measurement scale with a proportional correction
between the calibration point and 0.
Press
to display the value and then use
reference instrument.
Exit from calibration by pressing button
X
.
CONFIGURATION PARAMETERS
Setup menu is accessed by pressing buttons
With button
or
select the parameter to be modifi ed.
Press button
to display the value.
By keeping button
pressed, use button
or
When button
is released, the newly programmed value is stored and the following parameter is displayed.
To exit from the setup, press button
X
or wait for 30 seconds.
PAR
RANGE
DESCRIPTION
SCL
1°C;
Readout scale.
2°C;
1°C : measuring range
-50/-19.9 ... 99.9/150°C for LTR-5T
°F
-40/-19.9 ... 99.9/125°C for LTR-5C
0.0 ... 99.9 %r.H. for LTR-5A
2°C : measuring range
-50 ... 150°C for LTR-5T
-40 ... 125°C for LTR-5C
00 ... 99 %r.H. for LTR-5A
°F : measuring range
-60 ... 300°F for LTR-5T
-40 ... 250°F for LTR-5C
Caution: upon changing the SCL value, it is then absolutely necessary to re-configure the parameters relevant to the
absolute and relative temperatures (SPL, SPH, 1SP, 1HY, etc..).
SPL
-50..SPH
Minimum limit for 1SP setting
SPH
SPL.150°
Maximum limit for 1SP setting
1SP
SPL... SPH
Setpoint (value to be maintained in the room).
1Y
HY / PID
Control mode.
With 1Y=HY you select control with hysteresis: parameters 1HY and 1CT are used.
With 1Y=PID you select a Proportional-Integral-Derivative control mode: parameters 1PB, 1IT, 1DT, 1AR, 1CT will
be used.
1HY
-19.9...19.9°C Thermostat differential [control with hysteresis].
Set 1HY on a value greater than zero to make the output work in refrigerating mode, vice versa set on a value lower
than zero to make the output work in heating mode. With 1HY=0 the output is always off.
ON
OFF
1SP
Fig. 1a. ON/OFF refrigerating control (1Y=HY, 1HY>0)
1PB
-19.9...19.9°C Proportional band [PID control].
Set 1PB on a value greater than zero to make the output work
in refrigerating mode, vice versa set on a value lower than
zero to make the output work in heating mode. With 1PB=0
the output is always off.
With a proportional controller, the temperature is controlled
by varying the time of activation of the output. The nearer the
temperature to set point, the less time of activation. A small
proportional band increases the promptness of response
of the system to temperature variations, but tends to make
it less stable. A purely proportional control stabilises the
X
.
temperature within the proportional band but does not cancel
the deviation from the set point.
1IT
0...999s
Integral action time [PID control].
The steady-state error is cancelled by inserting an
integral action into the control system. The integral action
X
pressed for 3 seconds.
time, determines the speed with which the steady-state
temperature is achieved, but a high speed (1IT low) may be
the cause of overshoot and instability in the response. With
1IT=0 the integral control is disabled.
1DT
0...999s
Derivative action time [PID control].
Response overshoot in a system controlled by a Proportional-
Derivative controller may be reduced by inserting a derivative
action in the control. A high derivative action (1DT high)
makes the system very sensitive to small temperature
variations and causes instability. With 1DT=0 the derivative
control is disabled.
1AR
0...100%
Reset of integral action time referred to 1PB [PID control].
Decreasing the parameter 1AR reduces the integral control action zone, and consequently the overshoot (see figure
on paragraph 1IT).
1CT
0...255s
Cycle time.
In the ON/OFF control (1Y=HY), after the output has switched on or off, it will remain in the new state for a minimum
time of 1CT seconds, regardless of the temperature value.
In the PID control (1Y=PID), the cycle time is the period of time in which the output completes a cycle (Time ON +
Time OFF). The faster the system to be controlled reacts to temperature changes, the smaller the cycle time should
be, in order to obtain a greater temperature stability and less sensitivity to load variations.
1PF
ON / OFF
Output state in case of probe failure.
+
or
to make the read value coincide with the value measured by the
BAU
SIM
OS1
+
X
for 5 seconds.
ADR
to set the desired value.
WIRING DIAGRAMS
230V~
ON
230V ~
OFF
T[°]
T[°]
1SP+1HY
1SP-1HY
1SP
Fig. 1b. ON/OFF heating control (1Y=HY, 1HY<0)
Overshoot
Steady-state error
1SP
1PB
Process
temperature
Time
Overshoot
1SP
1PBx1AR%
1PB
integral control
Process
action area
temperature
Time
Overshoot
1SP
1PB
Process
temperature
Time
NON / SBY
With BAU=SBY, the stand-by button is enabled.
0...100
Display slowdown.
-12.5..12.5°C Probe T1 offset.
1...255
LTR-5 address for PC communication.
RS485
TTL
V
rH
data I/O
data I/O
9 10 11
V+
VIN
V-
OUT1
OUT1
16(4)A
12(4)A
2
3
4
2
3
4
6
7
230V~
LTR-5AQRE-A
RS485
data I/O
10
11
OUT1
12V
3
4
6
7
-
+
S.S.R.
LTR-5CSFE-B
TECHNICAL DATA
Power supply
LTR-5...D
12Vac/dc±10%, 2W
LTR-5...E
230Vac±10%, 50/60Hz, 2W
LTR-5...U
115Vac±10%, 50/60Hz, 2W
Relay outputs (LTR-5..R..)
LTR-5.SR..
OUT1 16(4)A
LTR-5.QR..
OUT1 12(4)A
SSR drive (LTR-5..F..)
OUT1
15mA 12Vdc
Inputs
LTR-5A...:
0-1V
LTR-5C...:
NTC 10KΩ@25°C, part No. LAE SN4...
LTR-5T...:
PTC 1000Ω@25°C, part No. LAE ST1...
10
11
Measuring Range
LTR-5A...:
0...99%r.H.
LTR-5C...:
-40...125°C
LTR-5T...:
-50...150°C
6
7
Measuring accuracy
LTR-5A...:
<±0.7%r.H. in the measuring range
LTR-5C...:
<±0.3°C -40...100°C; ±1°C out of that range
LTR-5T...:
<±0.3°C -50...140°C; ±1°C out of that range
Operating conditions
LTR-5TSRE-B
-10 ... +50°C;
15...80% r.H.
CE (Reference Norms)
EN60730-1; EN60730-2-9;
EN55022 (Class B);
EN50082-1
Front protection
IP55
VIA PADOVA, 25
31046 ODERZO /TV /ITALY
TEL. +39 - 0422 815320
FAX +39 - 0422 814073
www.lae-electronic.com
E-mail: sales@lae-electronic.com
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