ASCON TECNOLOGIC R38 - Microprocessor Based Digital Electronic Controller Quick Guide

OUTLINE DIMENSIONS (mm)

Mounting requirements
This instrument is intended for permanent installation, for indoor use only, in an electrical panel which encloses the rear housing, exposed terminals and wiring on the back.

Select a mounting location having the following characteristics:

• It should be easily accessible;
• There is minimum vibrations and no impact;
• There are no corrosive gases;
• There are no water or other fluids (i.e. condensation);
• The ambient temperature is in accordance with the operative temperature (0 ÷ 50°C);
• The relative humidity is in accordance with the instrument specifications (20 ÷ 85%).

The instrument can be mounted on panel (thickness 12 or 29 mm max.). When the maximum front protection (IP65) is desired, the optional screw type bracket (#2) must be mounted.

CONNECTION DIAGRAM

R38: 100/240 Vac model

R38: 24 Vac/dc - 12 Vdc models

General notes about wiring

• Do not run input wires together with power cables;
• External components (like zener barriers, etc.) connected between sensor and input terminals may cause errors in measurement due to excessive and/or not balanced line resistance or possible leakage currents;
• When a shielded cable is used, the shield should be connected to earth at one point only;
• Pay attention to the line resistance; a high line resistance may cause measurement errors.

Thermocouple Input

External resistance: 100W max., error 0.5% of span max..
Cold junction: Automatic compensation from 0 to 50°C.
Cold junction accuracy: 0.1°C/°C after a warm-up of 20 minutes.
Input impedance: > 1 MW.
Calibration: According to EN 60584-1.
Note: Por TC wiring use proper compensating cable preferable shielded.

PT100 Input

Input circuit: Current injection (135 µA).
Line resistance: Not compensated.
Calibration: According to EN 60751/A2.

PTC/NTC/PT1000 Input

Input circuit: Current injection (25µA).
Line resistance: Not compensated.

Output

Outputs Safety notes

• To avoid electrical shocks, connect the supply cables at the end of the wiring procedure;
• For supply connections use 16 AWG or larger wires rated for at last 75°C;
• Use copper conductors only;
• SSR (Solid State Relay) Outputs are NOT isolated. A double or reinforced isolation between instrument output and power supply must be assured by the external solid state relay.

Output 1

Relay

Contact rating: 8 A /250 V cosj =1; 3 A /250 V cosj =0.4;
Operations: 1 x 10 5.

SSR

Logic level 0: Vout < 0.5 Vdc;
Logic level 1: 12 V ±20% @ 1 mA; 10 V ±20% @ 20 mA.

Output 2

Relay

Contact rating: 8 A /250 V cosj = 1; 3 A /250 V cosj = 0.4;
Operations: 1 x 10 5.

SSR

Logic level 0: Vout < 0.5 Vdc;
Logic level 1: 12 V ±20% @ 1 mA; 10 V ±20% @ 20 mA.

Power Supply

100 ÷ 240 Vac

Power consumption: 3.6 VA max.
Supply voltage: 100 ÷ 240 VAC/DC (+10%)

12 Vdc - 24 Vac/dc

Power consumption: 1.44 W (12 V), 3.15VA (24 V) max.;
Supply voltage: 12 VDC (-15 ÷ +10%) 24 VAC/DC (-15 ÷ +10%)

Notes:

1. Before connecting the instrument to the electrical supply, make sure that line voltage is equal to the voltage shown on the identification label;
2. Do not place signal cables parallelly or next to power cables or to noise sources;
3. The power supply input is NOT fuse protected. Please, provide a T type 1A, 250 V fuse externally;
4. The DC power supply is not polarized.

TECHNICAL CHARACTERISTICS

Technical specifications

Case: Plastic, self-extinguishing degree: V-0 according to UL 94.
Front protection: IP 65 (when the screw type bracket is mounted) for indoor locations according to EN 60070-1.
Rear terminals protection: IP 20 according to EN 60070-1.
Installation: Panel mounting.
Terminal block: 11 screw terminals (screw M3, for cables of 0.25 ÷ 2.5 mm² or from 22 AWG to 14 AWG).
Dimensions: 75 x 33 mm, depth 75.5 mm.
Cutout: 71 (-0 ÷ +0.5 mm) x 29 (-0 ÷ +0.5 mm).
Weight: 180 g approximately.
Insulation voltage: 2300 V rms according to EN 61010-1.
Display: One 3 digits red display h 12 mm.
Display updating time: 500 ms.
Sampling time: 130 ms.
Resolution: 20000 counts.
Total Accuracy: ±0.5% F.S.V. ±1 digit @ 25°C of room temperature.
Electromagnetic compatbility and safety requirements:
Compliance: EMC directive 2004/108/CE (EN 61326-1),
LV directive 2006/95/CE (EN 61010-1).
Installation category: II.
Pollution category: 2.
Temperature drift: Is part of the global accuracy.
Operating temperature: 0 ÷ 50°C (32 ÷ 122°F).
Storage temperature: -30 ÷ +70°C (-22 ÷ 158°F).
Humidity: 20 ÷ 85% RH, non condensing.

HOW TO ORDER

Note: The screw type bracket # 2 (necessary to obtain the IP65 front protection) and other options can be requested to our sales offices.

CONFIGURATION PROCEDURES

Introduction

When the instrument is powered, it initially works according to the parameter values loaded in its memory.
The instruments behavior and its performance are governed by the value of the memorized parameters.
At the first start up the instrument will use a "default" parameter set (factory parameter set); this set is a generic one (e.g. a TC J input is programmed).
We recommend that you modify the parameters to suit your application (e.g. set the right input type, Control strategy and define an alarm, etc.).
To change these parameters you will need to enter the "Configuration procedure".

Instrument behaviour at Power ON

At power up the instrument can start in one of the following modes depending on its configuration:

Auto mode

• The display will show the measured value;
• The instrument performs the standard loop control.

Stand by mode (St.bY)

• The display shows alternately the measured value and the message St.bY or od;
• The instrument performs no control (the outputs are OFF);
• The instrument is working as an indicator.

We define the above conditions as "Standard Display".

Front Panel Description

1. Key

• Pressed for 5 s, it allows access to the parameters programming mode.
• In programming mode, it is used for the change of the parameters and for the confirmation of the values.
• Still in programming mode, it can be used together with the key to modify the level of access (operator level or configuration level) of the selected parameter.
• During the normal functioning (not in programming phase), pressed together with the key for 5 s, it allows to lock and unlock the keyboard.
• During the normal functioning (not in programming phase), pressed together with the key for 5 s, it allows the reset or the acknowledgement of the alarms.

2. Key

• In programming mode, it is used for to decrease the values to be programmed and for the selection of the parameters.
• During the normal functioning (not in programming phase), quickly pressed, it allows to visualize and to modify the value of the set point.

3. Key

• In programming mode, it is used to increase the values to be programmed and for the selection of the parameters.
• Kept pressed for 3 s in programming mode it can be used to exit from it and return to the normal functioning.
• Still in the programming mode, it can be used together with thekey, to modify the level of access (operator level or configuration level) of the selected parameter.
• Pressed together with the key for 5 s, it unlocks the keyboard, when previously locked.
• During the normal functioning (not in programming phase), quickly pressed, it allows to visualize the output power.

4. Key

• If programmed through parameter ub. F, pressed for 1 s in the normal functioning mode, it allows the switch on/ off (Stand-by) or to perform one of the possible functions (to start a cycle of Autotuning, etc.).
• During the normal functioning (not in programming phase), pressed together with the P key for 5 s, it allows the reset or the aknowledgement of the alarms.

5. LED Set

• In programming mode, it is used for indicating the level of programming of parameters.
• If = , when the instrument is in Stand-by mode, it remains the only lit LED.
• In normal functioning mode, it flashes when a key is pressed to indicates the pressure has happend on the key.

6. LED Out1

• It indicates the Out1 condition ( compressor or temperature control device) activated (on), deactivated (off) or inhibited (flashing).

7. LED Out2

• It indicates the Out2 condition.

8. LED Tun

• It indicates the Autotuning is in progress.

Entering the configuration parameters

Press key and keep it pressed.

Condition 1:
The instrument shows (lock ON). The keyboard is locked.
Mantaining the pressure on the key, also press the key.
The LED Set begins to flash.

Keep the pressure on the two keys until the display shows (lock OFF).
Now release the keys. The keyboard is now unlocked.
Note: If no button is pressed for a time longer than the time programmed with the Lo parameter, the key lock will be automatically enabled.

Condition 2:
The instrument displays no message. In this situation we can have 2 different cases:

Case 1: The parameters protection (password) is not active.
Press key and keep it pressed for around 5 seconds.
The display shows the code of the first configuration parameter.

With the / keys, select the parameter to be edited.

Case 2: The parameters protection (password) is active.
Press key and keep it pressed for more than 5 seconds.
The display shows the code that identifies the first parameter that has been moved into the Operator level.

Press key. The display shows .
Press key again. The display shows .
With the /keys, program the password and confirm it pushing key again.
Note: The factory default password is 0 (no password).

2.A) If the password is correct, the instrument shows the code that identifies the first configuration parameter.
2.B) If the password is not correct, the instrument shows again.

1. Once entered into the configuration parameters, select the parameter to be modified using the /keys.
2. Press key. The instrument alternatively displays the parameter code and its value.
3. Modify the parameter value using the /keys.
4. Press key to store the new value. The display returns to display the code of the selected parameter.
5. With the /keys, it is therefore possible to select another parameter and to modify it as described at points a, b, c, d.

Note: The instrument shows the parameters applicable to the hardware options in accordance with the specific instrument configuration [i.e. setting "AL1t - Alarm 1 type" equal to nonE (not used), all parameters related with the alarm 1 will be skipped].

To exit from the programming mode do not touch any key for around 30 s, or press key for around 5 s.

Parameter protection through a password

The instrument has a function that protects the parameters through a password, programmable through parameter . If you wish to have this protection, you must set the parameter to the number you would like to be your password and then exit from parameters programming.
When the protection is active, to be able to have access to the parameters, press the key and keep it pressed for about 5 s. Afterwards, the display shows , press again, the instrument shows .
Now, through the and keys, set the number of your password and press again.
If the password is correct the display shows the code that identifies the first parameter and it will be possible to program it with the same procedure as described on the previous paragraph.
The password protection is disabled when = .

If the password is forgotten, use password -.
This allows to access the protected parameters and verify/ modify the parameter.

Customized parameters programming

(levels of parameters programming)

The factory programming hides all the parameters behind the password with exception of the set point 1.
If you wish to modify some parameters, maintaining the protection on the others, after setting the Password through parameter, follow this procedure:
a) Enter the programming through the Password.
b) Select the parameter to be programmable without Password.
c.1) The Set LED is flashing.
The parameter is protected by the password.
c.2) The Set LED is lit but not flashing.
The parameter is not protected by the password.

To modify the level of access of the parameter (in other words: to have the parameter protected or not by the password) press the key and keeping it pressed press the key.
The Set LED will change its state, pointing out the new level of accessibility of the parameter (switched on = not protected; flashing = protected by password).
If the Password is enabled and some parameters have been set as "not protected", entering the programming mode the instrument will first display all the parameters set as "not protected" and then the parameter. By entering the password here all other parameters can be viewed.

Factory Reset (load default parameters)

It is possible to restore the instruments factory configuration. To load the factory default parameter settings, proceed as follows:

• Enter in configuration mode (see 5.4 paragraph).
• If no password is programmed, set different from .
• Exit from configuration mode.
• Press the button for more than 7 seconds. The display shows .
• Release the button and push it again. The display shows .
• Using the and buttons set the value -.

Once the password has been confirmed by pressing the key, the display shows for approximatively 2 s "---", the instruments then runs through the start up procedure resetting all the parameters to the factory defaults.

ON/Stand-By function

When supplied, the instrument can assume 2 different conditions:
ON: Means that the controller activates the programmed control functions.
STAND-BY: Means that the controller activates no control functions and the control outputs are forced to zero (the display results switched ON or OFF according to the parameter setting).

The controller starts in the same way it was before the switch OFF.
The ON/STAND-BY condition can be selected pressing the key for 1 s.
The passage from STAND-BY to ON condition, does not activate the Soft-start (or ) or the Autotuning and hides the alarms. When the instrument is in STAND-BY mode with the display on the display alternates between the measure value and .
When the instrument is in STAND-BY with display OFF, the display is completely dark except for the decimal point of the LSD [Set LED (5)].
When the instrument is in STAND-BY mode (display ON or OFF) it is however possible to enter the parameters programming.

Configuring all the parameters

In the following pages we describe all the instrument parameters. However, the controller shows the parameters applicable to the hardware options in accordance with the specific instrument configuration [i.e. setting "o2F - Alarm 2 function" equal to (not used), all parameters related with that alarm will be skipped].

[1] SPL - Minimum Set Point value
Range: From -99.9 to SPH engineering units.
[2] SPH - Maximum Set Point value
Range: From SPL to 999 engineering units.
[3] SP1 - Set Point
Range: From SPL to SPH engineering units.
[4] SP2 - Second Set Point
When 2 control outputs are programmed with ON/OFF action, the instrument uses SP1 to command OUT1 and SP2 (see following parameter) to command OUT2.
Available: When Out2 has been programmed as control output.
Range: From SPL to SPH engineering units.
[5] AL - Alarm threshold
Available: When Out2 has been programmed as alarm.
Range: -99.9 ÷ 999 engineering units.
[6] tun - Autotuning
Available: When o1.F = PID
Range:

• ALL = the Autotuning is performed at every start up and parameters Pb, Ti and Td are hidden.
• onE = The Autotuning is performed only at the next start up.
• ub = Manual start of the Autotuning through U key (parameters Pb, Ti and Td are visible).

Note: When the Autotuning and the soft start, or the delay at the start up, have been programmed, the instrument performs first the soft start (with the parameters it has in memory) and then performs the Autotuning.

[7] Pb - Proportional band
Available: When o1F = PID and tun = ub.
Range: 1 ÷ 999 engineering units.
[8] ti - Integral time
Available: When o1F = PID and tun = ub.
Range: OFF (excluded)/1 ÷ 500 seconds.
[9] td - Derivative time
Available: When o1F = PID and tun = ub.
Range: OFF (excluded)/1 ÷ 200 seconds.
[10] SEn - Input type

Model	Selection	Sensor	Measuring range
F	J.C	TC J	-40 ÷ 999°C
	Ca. C	TC K	-40 ÷ 999°C
	J.F	TC J	-40 ÷ 999°F
	Ca. F	TC K	-40 ÷ 999°F
A	Pt. C	PT 100	-50.0 ÷ 850°C (autoranging)
	Pt. F	PT 100	-58.0 ÷ 999°F (autoranging)
T	nC.C	NTC	-50.0 ÷ 109°C (autoranging)
	PC.C	PTC	-50.0 ÷ 150°C (autoranging)
	nC.F	NTC	-58.0 ÷ 228°F (autoranging)
	PC.F	PTC	-58.0 ÷ 302°F (autoranging)
	P1.C	Pt 1000	-50.0 ÷ 850°C (autoranging)
	P1.F	Pt 1000	-58.0 ÷ 999°F (autoranging)

[11] dP - Decimal point
Range:

• YES = Autoranging display;
• nO = display without decimal point.

[12] CA - Offset on the displayed value
Range: -300 ÷ 300 engineering units.
[13] Ft - Filter on the displayed value
Range: 0 (excluded)/1 ÷ 20 seconds.
[14] o1F - Out1 function
Range:

• H.rE = PID control with heating action (reverse);
• C.rE = PID control with cooling action (direct);
• on. H = ON/OFF control with heating action (reverse);
• on. C = ON/OFF control with cooling action (direct).

[15] tr1 - Out1 cycle time
Range: 1 ÷ 250 seconds.
[16] o2F - Out2 function
Range:

• When o1F is equal to H.rE or C.rE:
  • no = Not used;
  • HAL = Absolute high alarm;
  • LAL = Absolute low alarm;
  • b. AL = Band alarm (simmetric to the set point);
  • dHA = Deviation high alarm;
  • dLA = Deviation low alarm.
• When o1F = on. H or on. C:
  • no = Not used;
  • HAL = Absolute high alarm;
  • LAL = Absolute low alarm;
  • b. AL = Band alarm (simmetric to the set point);
  • dHA = Deviation high alarm;
  • dLA = Deviation low alarm;
  • SP.C = SP2 - ON /OFF control with cooling action;
  • SP.H = SP2 - ON /OFF control with heating action;
  • nr = ON/OFF Neutral Zone [o2F will make the opposite action to the one programmed on o1F, while the hysteresis (parameter d1) becomes the neutral zone].

Note: The Neutral Zone functioning is used to control the plants with an element that causes a positive increase (ex. Heating, Humidifying etc.) and an element that causes a negative increase (ex. Cooling, Dehumidifying etc.).
The control works on the programmed outputs depending on the measure, on the active Set point "SP", and on the programmed hysteresis "d1".
The controller works in the following way: it switches OFF the outputs when the process value reaches the Set Point and activates the heating output when the process value is lower than [SP - d1], or it switches on the cooling output when the process value is higher than [SP + d1].
Accordingly, the element that causes the positive increase must be connected to the output programmed as heating, while the element of negative increase must be connected to the output programmed as cooling.

Table of the possible combinations

O1F	O2F	Displayed parameters
H.rE	H.AL, L.AL, b. AL, dHA, dLA	SP1, AL
C.rE	H.AL, L.AL, b. AL, dHA, dLA	SP1, AL
on. H	H.AL, L.AL, b. AL, dHA, dLA	SP1, AL
	SP.C, SP.H	SP1, SP2
	Nr	SP1 only
on. C	H.AL, L.AL, b. AL, dHA, dLA	SP1, AL
	SP.C, SP.H	SP1, SP2
	Nr	SP1 only

[17] d1 - Out1 hysteresis or neutral zoneAvailable: When Out1 is equal to hn. H or on. C.
Range: 0.1 ÷ 999 engineering units.
[18] d2 - Out2 hysteresis
Available: When o2F is different from nr.
Range: 0.1 ÷ 999 engineering units.
[19] AL.F - Alarm function
Available: When o2F is programmed as alarm output.
Range:

• AL = Automatic reset Alarm;
• AL.n = Latched Alarm;
• AL.A = Aknowledgeable Alarm.

AL = Automatic reset Alarm

AL.n = Latched Alarm

AL.a = Acknowledged Alarm

[20] AL.t - Inhibition time of the alarm at start up or after a Set Point change
Range: 0 = OFF (any hidding)/0.01 ÷ 9.59 hh.mm.

Note: When the measure reaches the alarm threshold, the instrument disables the hidding of the alarm.

[21] Pct - Compressor protection time
The protection prevents the output cycling and therefore reduces relay wear by waiting for the time setting to elapse before allowing a subsequent switching of the output. In other words, it defines the minimum time that will pass between the switch off of a cooling output and its following reactivation.
Available: When at least one output is programmed ascooling output.
Range: 0 (OFF)/0.01 ÷ 9.59 hh.mm.

Note: This parameter has effect to ALL the cooling outputs.

[22] SSt - Soft start time
Range: 0 (OFF)/0.01 ÷ 9.59 hh.mm.

Note: When the control type is ON/OFF, the time of the soft start becomes an output time delay, the power is forced to 0 and the parameter SSP is hidden.

[23] SSP - Power during Soft Start
Available: When Sst is different from 0.
Range: 0 ÷ 100%.

Note: If programmed = 0, also the alarms and/or the second control output remains = 0 and the instrument displays for the programmed time.

[24] ub. F - key function

Range:

• no = No function;
• Tun = It activates the manual tuning;
• Sb = Stand-by mode;
• Sb.o = Stand-By mode with display off.

[25] PP - Parameters protection Password
Range: 1 ÷ 999.
[26] Lo - Time for the Key lock automatic enable
This parameter allows to set the time that the instrument will wait before to automatically enable the key lock. The time count will re-start after a key pressure.
Range: 0 (lock disabled)/1 ÷ 30 minutes.

ERROR MESSAGES

Out of range signals

The display shows the OVER-RANGE and UNDERRANGE conditions with the following indications:

Over range

Under range

The sensor break will be signaled as follows:

Sensor break

Note: When an over-range or an under-range is detected, the alarms operate as in presence of the maximum or the minimum measurable value respectively.

To check the out of span Error condition, proceed as follows:

1. Check the input signal source and the connecting line;
2. Make sure that the input signal is in accordance with the instrument configuration. Otherwise, modify the input configuration (see section 4).
3. If no error is detected, send the instrument to your supplier to be checked.

List of possible errors

AtE- Auto-tune not finished within 12 hours.
EPr- Possible problem of the instrument memory.
The messages disappear automatically.
When the error continues, send the instrument to your supplier.

GENERAL NOTES

Proper use

Every possible use not described in this manual must be considered as a improper use.
This instrument is in compliance with EN 61010-1 "Safety requirements for electrical equipment for measurement, control and laboratory use"; for this reason it must not be used as a safety equipment.

Ascon Tecnologic S.r.l. and its legal representatives do not assume any responsibility for any damage to people, things or animals deriving from violation, wrong or improper use or in any case not in compliance with the instrument's features.

Whenever a failure or a malfunction of the control device may cause dangerous situations for persons, thing or animals, please remember that the plant has to be equipped with additional safety devices.

Warranty and Repairs

We warrant that the products will be free from defects in material and workmanship for 18 months from the date of delivery. Products and components that are subject to wear due to conditions of use, service life, and misuse are not covered by this warranty. The warranty is limited to repairs or to the replacement of the instrument.
The tampering of the instrument or an improper use of the product will bring about the immediate withdrawal of the warranty's effects.
In the event of a faulty instrument, either within the period of warranty or further to its expiry, please contact our sales department to obtain authorisation for sending the instrument to our company.
The faulty product must be shipped to Ascon Tecnologic with a detailed description of the faults found, without any fees or charge for Ascon Tecnologic, except in the event of alternative agreements.
Before supplying tension to the instrument, make sure that it is perfectly dry.

Disposal

The appliance (or the product) must be disposed of separately in compliance with the local standards in force on waste disposal.

PARAMETER TABLES

ASCON TECNOLOGIC S.r.l.
Viale Indipendenza 56, 27029 - VIGEVANO (PV) ITALY
TEL.: +39 0381 69871 - FAX: +39 0381 698730
http:\\www.ascontecnologic.com
e-mail: info@ascontecnologic.com

Documents / Resources

References

• Ascon Tecnologic – Ascon Tecnologic

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