COMECO RT284U Operation Manual

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Page 1

Specifications

Case

Input Outputs:

Electromechanical relay SSR MOS gate Output for external SSR

- K1

- K2

Serial Interface

Power Supply

Excitation Voltage (Vaux) Consumption Measurement Error Temperature Drift RTD Line Error Cold-junction Error Operating Temperature / Humidity Protection Class: front / terminals

 'B',  'H',  'V',  'Q',  'S',  'L',

 'R1',  'R2'

programmable up to 2 5A/250VAC with NO/NC or NO contact  1A/250VAC,  0.2A/250VAC

0.1A/60V, optically isolated

5...24 VDC, 30 mA

 relay,  SSR,  MOS gate,  for ext. SSR  relay,  SSR,  MOS gate,  for ext. SSR  RS485, isolated,  RS485 for "PolyMonitor", isolated  230 VAC,  90…250 VAC/DC,  24 VDC,

 12...24 VAC/DC,

 ...................................

 10...30 V, 30 mA,  ........................

less than 3 VA

≤ ± 0.3% from span ≤ 0.02% from span for 1 °C ≤ ± 0.001%/Ω at R

lin

≤ 50 Ω

≤ ± 1 °C at air temperature -10…80 °C

-10…65 °C / 0…85% RH  IP65,  IP54 / IP20

Warranty and Support

………………………….

serial number

…………………………. manufacturing date

QC check mark …….……(passed)

(stamp)

88 Slavyanska Str. P.O.Box 378 Plovdiv 4000, BULGARIA tel: +359 32 646523, 646524 fax: +359 32 634089, 646517

e-mail: [email protected]

QD-8.2.4-WC

Warranty

COMECO warrants this product to be free from defects in materials and workmanship for 2 years. If your unit is found to be defective within that time, we will promptly repair or replace it. This warranty does not cover accidental damage, wear or tear, or consequential or incidental loss. This warranty does not cover any defects caused by wrong transportation, storage, installation, or operating (see 'Specifications').

Technical support

In the unlikely event that you encounter a problem with your COMECO device, please call your local dealer or contact directly our support team.

COMECO Inc., P.O.Box 378, Plovdiv 4000, BULGARIA, tel: +359 32 646523, 646524, fax: 634089

e-mail: [email protected], WWW .COMECOGROUP.COM

RT284U

wi t h k eyboard

OP E RATIO N MA N U AL

Please read this Operation Manual before mounting and operating!

Save the Manual for future references!

Wiring

Important notes:

♦

Strictly observe the requirements for RS485 network building!

♦

With DC power supply, the polarity does not matter.

♦

In case of 90...250 VAC/DC power supply, grounding the device via separate wire is mandatory for covering safety standards.

Input signal wiring

Connect the input with regard to its type through the respective and depending on the case type (see 'Specifications') terminals on the device back.

3-wire current transmitters can be supplied from Vaux. Voltage transmitters must be supplied externally!

Output wiring

Connect the outputs with regard to their types (see 'Specifications') via the respective terminals.

RS485 wiring

Connect the unit to RS485 network line via the respective terminals (connector).

Power supply wiring

Connect the right power supply voltage for your device (see 'Specifications').

More detailed

wiring diagrams are available at comecogroup.com under 'Support' tab.

Communication Protocol

Table 2

Parameter Symbol

Value

Input Type

inp

pt100, pt1000, ptc1, ptc2, r.0.1k, t.c.b, t.c.j, t.c.k, t.c.r, t.c.s, t.c.t, u, u.0.10, i.0.20, i.4.20

Unit

unit

c, f

Point Position

pnt

0, 1, 2, 3

Input Low

i.hi

-1999...9999

Input High

i.lo

-1999...9999

Input Correction

i.cor

-1999...9999

Address

addr

1...254

Baud Rate

baud

1200, 2400, 4800, 9600

Gradient

grad

0...9999

Filter Time

f.t

0...9999

Filter Band

f.b

0...M

Input Value

p.v

Error Info

error

* Input Value (read-only)

numerical value with ISU

- measured input value

sat.lo

- ADC under-range

sat.hi

- ADC over-range

inp.br

- sensor break

break

- device failure

noise

- noisy measurement

** Error Info

- initializes non-volatile memory

-1

- error FAiL (read-only)

1...29

- errors ER01... ER29 (read-only)

Protocol architecture

♦

The protocol is based on UART protocol with:



Baud Rate - as defined by parameter Baud Rate;



Data bits - 8;



Parity Control - Even;



Stop bit - 1.

♦

ASCII protocol is used for communicating, and the information is exchanged in frames.

♦

Each frame consists of 1, or 2 words separated by byte 32 (SPACE), and ends with bytes 13 (CR) and 10 (LF). The first word in the frame denotes a parameter 'Symbol' as taken from Table 2 and the second word (if needed) is the parameter 'Value', both spelled with only small Latin letters, digits, dots, and/or the '-' sign.

Device activating

♦

To respond to commands, the device should be active.

♦

For a device to be activated, it must receive a Uх command, where 'х' is the value of the parameter Address or the value '255' (if device address is unknown), and respond to it with ok..

♦

If a device does not respond even to U255, check the UART protocol settings, chiefly Baud Rate value.

PROGRAMMABLE CONTROLLER

27-05.12

Page 2

Overview

RT284U is a low-cost multifunctional programmable controller. Its universal input accepts the most common RTDs, thermocouples, and linear signals. The device can be equipped with up to 2 relay outputs, which can control various actuators using ON/OFF control algorithm, and the optional RS485 interface enables networking. RT284U allows adjusting of the built-in digital filters and the programmable output delay, resulting in increased operation reliability in case of industrial interferences.

Input Setting

♦

Open the case.

♦

Follow the diagrams on the left to find the configuration jumpers J1 and J2, located on the main board (cases 'B', 'H', 'V', 'L', 'R1' and 'R1') or on the outer side of the right board (cases 'Q' and 'S').

♦

To set input 0...10 V, short out J2.

♦

To set any of the other possible input types, short out J1.

Declaration of Conformity

The undersigned hereby declares, on behalf of COMECO Inc., that this device has been manufactured in compliance with standards EN 61000 and EN 61010, and meets the requirements of Directives 2004/108/EC and 2006/95/EC.

Vladimir Sakaliyski CEO COMECO Inc.

Waste Disposal

Do not dispose of electronic devices together with household waste material!

If disposed of within European Union, this product should be treated and recycled in accordance with the laws of your jurisdiction implementing the WEEE Directive 2002/96 on the Waste Electrical and Electronic Equipment.

Communication Protocol

Notes:

♦

RT284U adds 3 spaces in the beginning of the response.

♦

RT284U returns decimal point even when the value is integer.

♦

#13 (CR) is byte 0x0D; #10 (LF) is byte 0x0A.

♦

The U255 command should be used only in case just one slave is presented.

Protocol examples:

PC or other device:

RT284U response:

activating device number 10

U10#13#10 ok.#13#10

reading filter time

f.t#13#10 f.t 0015.#13#10

writing filter time of 30

f.t 30#13#10 f.t 0030.#13#10

reading input value of 27.5

p.v#13#10 p.v 027.5#13#10

invalid command.

command not recognized

parity error.

parity error detected

not a number.

attempt to write symbols for numerical parameter

point error.

value resolution greater than parameter’s one

out of range.

value out of range

unit is busy.

writing is allowed only to device at Basic level

read only.

parameter is read-only

can't save.

problem with writing in non-volatile memory

♦

The device remains active until it receives another Uх command, but with different device address, a FAiL error, or with reset.

♦

Any Baud Rate value change through the communication interface also deactivates the device.

Reading from a device

♦

If the frame consists of only one word, it is recognized as a command for reading.

♦

The device responds to it by returning the same word and its value, according to Table 2.

Writing in a device

♦

If the frame consists of two words, it is recognized as a command for writing.

♦

With writing, transferred are the same two words that would have been received at the respective command for reading from the device.

♦

After successful writing, the device responds with the respective command for reading, except for the baud command.

Other device responses

♦

When Error Info value is -1, the device substitutes any command for error reading.

♦

RT284U responses in case of incorrect protocol use are given on the left.

Reset

To reset the device, send command reset.

Mounting

Panel mounting ('B' / 'H' / 'V' / 'Q' / 'S' / 'L')

♦

Place RT284U into an appropriate panel cut-out.

♦

Tighten it into place using the enclosed mounting bracket(s).

Rail mounting ('R1')

♦

Insert the upper rail edge into the upper plastic groove of the rail-installing mechanism on the back side of the unit.

♦

Press the unit towards the lower rail edge until the moving part of the installing mechanism clicks.

Rail mounting ('R2')

The device can be easily mounted on every 35 mm rail conforming to EN50022 by the means of a standard UNDECAL socket base.

Electro-Magnetic Interference (EMI) Issues

Important note:

A built-in RC noise suppression circuit is connected in parallel with relay contacts. Full AC voltage isolation is NOT provided when relay contacts are open. Small AC current (≈ 1.5 mA at 230 VAC) still flows through the RC circuit!

♦

All signal wires must be shielded. They must not be packaged together with power cables!

♦

Never lay the signal wires close to inductive or capacitive noise sources, such as relays, contactors, motors, etc.!

♦

All shields have to be grounded ONLY at one end, as closer as possible to the controller terminals!

♦

Avoid sharing supply lines with powerful consumers, especially with inductive loads, switched on and off.

♦

To stop unwelcome interference signals entering through the power supply lines, use shielded 1:1 isolation transformer!

♦

Shunt all switched (not only those switched by the controller) inductive consumers with special suppression networks: RC group and varistor - for AC loads, or diode - for DC loads.

♦

If the controller operates in a very powerful EMI area, it has to be mounted inside a grounded metal shielding box!

♦

To protect the interface from electro-magnetic disturbances, follow the RS485 standard guidelines.

'B' / 'H' / 'V'

'R1'

'L'

'Q'

'S'

'R2'

Page 3

Parameter Symbol Description

Configuration Parameters

(These parameters are part of Configuration level)

Input Type

inP

Type of signal that can be connected to the device input

Unit

unit

Temperature measurement unit

Point Position



Pnt

Display decimal point position

Input Low

ILo

Display value at low limit of the linear input range

Input High

IHi

Display value at high limit of the linear input range

Input Correction

Icor

Constant to be added to the measured input value

Address

Addr

Device address

Baud Rate

bAud

Serial interface rate

Gradient

GrAd

Maximum input signal change during the sampli ng period (120 ms)

Filter Time

Relative time constant of the input filter

Filter Band

Zone around the measured value, within which the filter is active

SP limit Low

%[L

Set-point Low limit

SP limit High

%[H

Set-point High limit

Direction 1

diR1

Control action direction of output K1

Direction 2

diR2

Control action direction of output K2

Parameters of the control algorithm

(These parameters are part of Parametric level)

+ Differential 1

[e1

Positive Differential of output K1

- Differential 1

me1

Negative Differential of output K1

Time On 1

ym1

ON duration of output K1

Time Off 1

y\1

OFF duration of output K1

Hold 1

HLe1

Holds the output reaction of output K1

The same 5 parameters, but with index 2 - for output К2

Parameters of Basic (operating) level

Set Point 1

%[1

Set-point value of output K1

Set Point 2

%[2

Set-point value of output K2

Input Filtration

Peak filter

This filter is intended for eliminating pulse spikes (peaks), which can appear in the input signal, in the following way:

♦

RT284U measures the input signal value every 120 ms (sample time).

♦

The measured values are compared subsequently. The filter checks the difference between the last two samples. If it does not exceed Gradient value, the device accepts the signal as normal.

♦

If the last measured value differs from the previous one by more than the Gradient value, the filter output is held until the device determines a presence of a normal signal. It is possible only if the input signal has not been changed with more than the Gradient value for four subsequent samples.

♦

If the device has not determined a normal signal for 20 subsequent samples, noiS appears on the display (see 'Basic level').

Low-pass filter

This first-order filter acts ONLY within a certain band around filter output value. This has been designed to cut periodic noises outside the communication signal spectrum.

♦

Filter operation is defined by two parameters:

Filter Time (defines filter time constant) and Filter Band (defines filter active band

around filter output value).

♦

If the newly measured value differs from the filter output by more than Filter Band, the filter resets with a new initial output value (newly measured value).

Output Control

Control output operation

♦

The control outputs operate according to the control algorithm parameters.

♦

The outputs deactivate with the value change of one of the following configuration parameters - Point

Position, Input Low, Input High, and Input Correction

- and remain inactive till Basic level is entered.

♦

The outputs deactivate also when an error has been detected (see 'Error messaging').

ON/OFF control algorithm

The static characteristic

of a relay controlled

by an ON/OFF algorithm

is shown on the left drawing.

Output hold

For eliminating undesirable

switches of the relay output,

additional parameter (Hold)

is assigned to hold

the output reaction

for certain period of time.

Output pulse mode

When a relay is forced

to ON by the control

algorithm, it can either

stay ON or pulse

depending on Time On and

Time Off parameter values.

Setting any of these

parameters to '0'

disables the Pulse mode.

Table 1

Value Unit

Notes

Pyh or Pyt - Pt100: -100…850 °C or Pt1000: -100…600 °C

Ptx1 or Ptx2 - PTC 1k or 2k: -50...150 °C

R)1

- resistive linear: 0…1 kΩ

yc-b

- T/C "B": 200...1800 °C

yc-J

- T/C "J": -20...1000 °C

yc-"

- T/C "K": -20...1300 °C

yc-r

- T/C "R": 0...1700 °C

yc-S

- T/C "S": 0...1700 °C

yc-t

- T/C "T": -40...400 °C

- voltage linear: 0…100 mV

I)20 or I$20 - current linear: 0…20 mA or 4…20 mA

w)10

- voltage linear: 0…10 V

.Cor .F - °C or °F

x1, x0.1, x0.01, x0.001 - when indicating values with the input-signal measurement unit (ISU)

-1999 ... 9999 ISU These parameters make sense ONLY in case of a linear input signal!

-1999 ... 9999 ISU OFFSET 1…254 -

!2, @4, $8, (6 bps 1200, 2400, 4800 (factory-set), or 9600 bps

0 … 9999 ISU used for input peak filtration; Value '0' cancels the filtration. 0 … 9999 - This parameter and the following one define a low-pass input filter.

0 … M ISU

temperature: whole part of M ≤ 100; linear: M = 25% of input range

within input range ISU

These parameters keep the Set point in safe limits, preserving it from random changes.

cooL, hEAt - ('cooling' , 'heating')

These parameters are accessible in the presence of the corresponding relay. 0 ... 9999 ISU lower than (High input range - Set Point 1)! 0 ... 9999 ISU lower than (Set Point 1- Low input range)!

0 ... 9999 sec. Value '0' disables Pulse mode.

0 ... 9999 sec.

These parameters are accessible in the presence of the corresponding relay.

within input range ISU

Page 4

Error Messaging

Message Parameters Error type

FAiL

all

Incorrect memory

br"

Service required!

ER01 GrAd

Out of range

ER02 \t

Out of range

ER03 \b

Out of range

ER04 %[L

Out of range

ER05 %[H

Out of range

ER06

%[L, %[H

%[L> %[H

ER11, ER21 ym1, ym2 Out of range

ER12, ER22 y\1, y\2 Out of range

ER13, ER23 HLe1, HLe2 Out of range

ER14, ER24 [e1, [e2 Out of range

ER15, ER25 me1, me2 Out of range

ER16, ER26 %[1, %[2

Out of range (%[L… %[H)

ER17, ER27

%[x - me x

Lower than Input Low Range Limit

ER18, ER28

Exceeds Input High Range Limit

ER29 Addr

Out of range

♦

In some cases, RT284U finds non-conformities in parameter values that must be corrected before operating at Basic level.

♦

The device indicates such kind of problems by displaying error messages as given on the left.

♦

If FAiL appears on the display, try debugging by turning the power off/on.

♦

If the problem persists,

press and hold or send command error 0

via the communication interface to restore the default (factory) settings.

Parameter Programming

Some parameters

are accessible only when the respective functionality is installed. (see 'Specifications').



- Changing

Point Position value reflects the real value of all parameters with ISU!

E.g.: changing

Point Position value from (х1) to (х0.1) would change a Set-point value of 100 to 10.0!!!

Controller parameters

RT284U is a programmable device whose service behavior is determined by a set of parameters. All the parameters, along with their names, symbols, and value ranges, are given in Table 1.

Setting numerical parameter value

♦

Enter parameter value adjustment mode (see 'Program Levels').

♦

The whole part of the value together with the left zeroes appears on the display, and the rightmost digit blinks.

♦

To select another digit, press .

♦

The 3 rightmost digits can accept values from 0000 to 9999, and the leftmost digit can also accept the values ---- and ````.

♦

To increase or decrease the blinking digit

value, use respectively or .

♦

Confirm the adjusted value by pressing

simultaneously

♦

If the new value has not been confirmed and no key has been pressed for a certain period of time, value adjustment automatically ceases, and the parameter retains its initial value.

Setting symbolic parameter value

♦

Enter parameter value adjustment mode (see 'Program Levels').

♦

Read the blinking parameter value.

♦

To change the value, use or ,

and to confirm, press

♦

If the new value has not been confirmed and no key has been pressed for a certain period of time, value adjustment automatically ceases, and the parameter retains its initial value.

Program Levels

Basic level

At Basic level, RT284U indicates the measured input value (PV) with a resolution, according to the Point Position parameter.

♦

If the whole part of PV cannot be entirely displayed, the unit generates blinking 'overflow' messages (oL or -oL, depending on PV sign).

♦

If PV is out of its operating range (the input range according to Table 1, extended by 5% on both sides), the device displays blinking symbolic messages: <__> (under-range) or {++} (over-range). When PV is out of physical range, the unit displays ----.

♦

Upon entering Basic level, RT284U may display the init message, indicating that some time is necessary for filter initialization.

♦

The noiS message may appear as a result of the peak filter operation (see 'Input filtration').

♦

To enter parameter value adjustment mode for Set Point 1,

press and hold until %[1 appears on the display.

To view the Set-point value, release the key.

♦

To enter parameter value adjustment mode for Set Point 2, follow the same procedure,

but start with the key.

Program Levels

Parametric level

This level contains the control algorithm parameters. If no relay output is installed, this level does not show up.

♦

Enter from Basic level by pressing and holding until PAr appears

on the display. Release the key. If the key is not released on time, RT284U enters Configuration level.

♦

Choose a parameter

using and .

♦

To enter parameter value

adjustment mode, press .

♦

If no key has been pressed for a while, the device automatically returns to Basic level, storing all confirmed changes.

♦

For quick exiting and saving,

use key combination + .

Configuration level

This level contains the configuration parameters of the device.

♦

Enter from Basic level by pressing and holding until conF

appears on the display.

♦

To access and adjust the configuration parameters, follow the algorithm described in 'Parametric level'.