Seneca Z-DAQ-PID Manual de usuario

Page 1

MI003419

MI002642-E

SENECA s.r.l.

Via Austria 26, PADOVA –ITALY

Tel. +39.049.8705355 –8705359 Fax. +39.049.8706287

Web site: www.seneca.it

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This document is property of SENECA srl. Duplication and reprodution are forbidden, if not authorized. Contents of the present

documentation refers to products and technologies described in it. All technical data contained in the document may be modified

without prior notice Content of this documentation is subject to periodical revision.

To use the product safely and effectively, read carefully the following instructions before use. The product must be used only for the use

for which it was designed and built. Any other use must be considered with full responsibility of the user. The installation,

programmation and set-up is allowed only for authorized operators; these ones must be people physically and intellectually suitable.

Set up must be performed only after a correct installation and the user must perform every operation described in the installation

manual carefully. Seneca is not considered liable of failure, breakdown, accident caused for ignorance or failure to apply the indicated

requirements. Seneca is not considered liable of any unauthorized changes. Seneca reserves the right to modify the device, for any

commercial or construction requirements, without the obligation to promptly update the reference manuals.

No liability for the contents of this documents can be accepted. Use the concepts, examples and other content at your own risk. There

may be errors and inaccuracies in this document, that may of course be damaging to your system. Proceed with caution, and although

this is highly unlikely, the author(s) do not take any responsibility for that. Technical features subject to change without notice.

USER MANUAL

Z-DAQ-PID

Universal input with pid controller

USER MANUAL –Z-DAQ-PID

Seneca Z-PC Line module: Z-DAQ-PID

The Z-DAQ-PID module acquires one universal input signal (voltage, current, potentiometer,

thermo-couple, thermo-resistance, m-voltmeter) and converts it to an analog format (with PID

regulation).

General characteristics

Three operating mode: conversion with PID regulator, conversion without PID regulator, manual

(constant output configurated through ModBUS register)

Two output types: analog or ON/OFF (time of high-state digital signal is directly proportional to

the analog signal)

Universal input: voltage, current, potentiometer, thermocouple (TC), RTD (Resistance

Temperature Detector) , m-voltmeter

Analog Output: voltage type, active current type, passive current type

Slew-rate, burn-out, output limiters setup

Modbus address and baudrate configurable by Dip-Switches

1. Features

INPUT

Number

Resolution

15 bits

Sampling time

Configurable between: 5 ms (“Fast”, no rejection), 16.66 ms

(rejection to 60 Hz) or 20 ms (rejection to 50 Hz)

Filter

Configurable between: 0 (no filter is applied), from 1 (min) to 19

(max)

Response time

Sampling time + 6 ms

Voltage-type IN

Scale range is configurable: from 0 V to 10 V. Input

impedance:>5M

Current-type IN (mA-

passive module/mA-

active module)

Scale range is configurable: from 0 mA to 20 mA. Internal shunt:

50It’s possible to power the sensor by: itself (mA-passive module)

or module (mA-active module) using #7 screw terminal (max 25 mA

to max 17 V, short-circuited protected)

USER MANUAL –Z-DAQ-PID

Potentiometer-type IN

Scale range is configurable: from 1 kto 100 k(with parallel

resistor R=330to connect externally). Excitation current:1 mA.

Input impedance:>5M

Thermocouple-type IN

For TC type: J, K, R, S, T, B, E, N. Input impedance:>5 M.

Automatic detection if a TC interruption occurs

RTD-type IN

For RTD type: PT100, PT500, PT1000, NI100. Resistance measure

(for 2,3 or 4-wires connection) and wire-resistance measure (for 3,4-

wires connection). Excitation current: 1.1 mA (PT100) and 0.11

mA(PT1000, PT500). Automatic detection if a wire or RTD

interruption occurs

Millivoltmeter-type IN

Scale range is configurable: from -10 mV to 80 mV. Input

impedance:>5 M

Errors related to max

measuring range

Accuracy

Thermal

stability

Linearity error

EMI

Voltage or current-type

input

0.1%

0.01%/°K

0.05%

<1% (2)

TC-type input:

J,K,E,T,N

0.1%

0.01%/°K

0.2°C

<1% (2)

TC-type input:R,S

0.1%

0.01%/°K

0.5°C

<1% (2)

TC-type input:B (3)

0.1%

0.01%/°K

1.5°C

<1% (2)

Cold junction

compensation (for TC-

type input)

2°C between

0-50°C

POT-type IN

0.1%

0.01%/°K

0.1%

<1%

RTD-type IN (4)

0.1%

0.01%/°K

0.02% (if t>0°C)

0.05% (if t<0°C)

<1% (5)

(1) For the input scale ranges, see “Connections”

(2) Influence of wire resistance: 0.1 V/

(3) Output zero if t<400°C

(4) For RTD type: PT100, PT500, PT1000, NI100. All the errors have to be calculated with

reference to resistive value

(5) Influence of wires resistance: 0.005%/, max20

USER MANUAL –Z-DAQ-PID

OUTPUT

Number

Resolution

14 bit

Signal-amplitude

limiting

The output signal can be amplitude-limited by an “output limiter”

Voltage-type OUT

Configurable between: 0-5 V, 0-10 V (with minimum load resistance:

1 k). Saturation value: 10.5 V

Current-type OUT

(active or passive)

Configurable between: 0-20 mA, 4-20 mA (with maximum load

resistance: 600 ). Saturation value: 21 mA. “Active current” =the

output: already powered on, needs to be connected to the passive

module; “passive current” =the output: powered off, needs to be

connected to the active module

Errors related to max

measuring range

Errors related

to max

measuring

range

Accuracy

Thermal

stability

Linearity

error

Voltage-type OUT

0.1%

0.01%/°K

0.01%

<1%

Voltage-type OUT

(active or passive)

0.1%

0.01%/°K

0.01%

<1%

CONNECTIONS

RS485 interface

IDC10 connector

RS232 interface

Jack stereo 3.5 mm connector: plugs into COM port

1500 Vac ISOLATIONS

Between: power supply, ModBUS RS485, analog input,

analog output

USER MANUAL –Z-DAQ-PID

POWER SUPPLY

Supply voltage

10 –40 Vdc or 19 –28 Vac (50Hz - 60Hz)

Power

consumption

Min: 0.5 W; Max: 2 W

The power supply transformer necessary to supply the module must comply with EN60742

(Isolated transformers and safety transformers requirements).

USER MANUAL –Z-DAQ-PID

2. Connections

For potentiometer input connection: you must add externally a R=330 , P=1 k-

100 k



3. Temperature Input Ranges

The input rages are shown in the following tables for Thermocouple:

TC-type

Scale range

TC-type

Scale range

-210°C..1200°C

-50°C..1768°C

-200°C..1372°C

-50°C..1768°C

-200°C..1000°C

250°C..1820°C

-210°C..1300°C

-200°C..400°C

The input scale range values, for RTD are shown in the following table.

RTD-type

Scale range

RTD-type

Scale range

PT100

-210°C..650°C

PT1000

-200°C..210°C

USER MANUAL –Z-DAQ-PID

PT500

-200°C..750°C

NI100

-60°C..250°C

4. Operation Modes

There are six possible functioning modalities for the Z-DAQ-PID, with reference to the following

figure:

- conversion with PID, analog output

- conversion with PID, ON/OFF output

- conversion without PID, analog output

- conversion without PID, ON/OFF output

- manual (constant output), analog output

- manual (constant output), ON/OFF output

With reference to the following figure, the lowest part shows the Z-DAQ-PID setting procedure in

three steps: input setting, operating modality setting, output setting.

In particular, there are three operating modes, each of them allows to supply a ON/OFF output or

an analog output:

USER MANUAL –Z-DAQ-PID

Operating modality

Description

Conversion with PID

The analog output is a function of the analog input

processed by the PID transfer function. Moreover, analog

output is directly proportional to the analog input

Conversion without PID

The analog output is directly proportional to the analog

input

Manual

(constant output without

PID)

The analog output is input-indipendent. Anyhow, the input

is acquired and can be found in the RS485 registers (only

reading)

Slew rate allows to limit the slope of the signal (see reg.40031 and 40032) and burn-out allows to

overwrite the OUT-Fault value (reg.40020, 40021) to the reg.40105, 40106 (burn-out overwriting

is available only for analog output).

Operating modality is configurable by software or by FunctionMod register (40007.[15:8]), with

reference to the “RS485 registers table”.

There are two output type of Z-DAQ-PID, regardless of operating modality:

Out type

Description

Analog

OUT is an analog signal

ON-OFF

(see the following figures)

OUT is a ON/OFF signal. High state output is OUT-ES,

low state output is OUT-SS

If out type is “ON/OFF”, the Z-DAQ-PID module allows to have a ON/OFF output with activation

time tON (time corresponding to the high-state output) directly proportional to OUTL.

To understand the ON/OFF out type functioning, see the following figure.

USER MANUAL –Z-DAQ-PID

It is possible to limit upper time of high-state ON/OFF output (reg.40029) and to limit lower time

of low-state ON/OFF output (reg.40030). The cycle time is reg.40028 (constant frequency of

ON/OFF output=1/cycle time).

CONVERSION WITH PID

In “Conversion with PID” operating mode, the output (analog or ON/OFF) is a function of the

analog input processed by the PID transfer function. Moreover, output is directly proportional to

the analog input.

USER MANUAL –Z-DAQ-PID

PID regulation allows to incline input signal PV (process value) to SP (set point value) with

particular properties (rise time, overshoot, steady-state error, settling time, etc…). In the following

figure is shown the Z-DAQ-PID module used as PID.

In particular, “e” means the difference between set-point and process-value:

Signal error e = (process value –set point) means PID regulation direct-type (for example: used

for cooling)

Signal error e = (set point –process value) means PID regulation reverse-type (for example: used

for heating)

The PID regulation is described by the following parameters:

Term

Parameter

Meaning

Proportional

Proportional band

40025

Integral

Integral time

40026

Derivative

Derivative time

40027

where Tsample means the PID sampling time (it is equal to 100ms).

If BP decreases

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