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AMALGAMATED INSTRUMENT RM4-IV, Руководство по эксплуатации и инструкция

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AMALGAMATED INSTRUMENT RM4-IV Скачать руководство пользователя страница 39

7.2

PI relay control setpoint

Display:

A

x.

SP

Range:

Any display value

Default Value:

0

The control setpoint is set to the value in displayed engineering units required for the control
process. The controller will attempt to vary the control output to keep the process variable at the
setpoint. Note that the control setpoint value can be reached and adjusted via the “easy access”
mode (see “Explanation of functions” chapter) if the

ACCS

function is set to

EASY

. This feature

could be useful if the setpoint is to be frequently changed.

Process above
setpoint

Process below
setpoint

Process at
setpoint

SETPOINT

PROCESS

TIME

7.3

PI relay control span

Display:

ctrI SPAN

Range:

Any display value

Default Value:

100

The function of the control span is to define the limit to which the PI control values will relate. The
control span value will be common to all control relays i.e. if more than one control relay output is
being used then each of these relays operates from the same control span setting. The span value
defines the range over which the input must change to cause a 100% change in the control output
when the proportional gain is set to

1.000

. This function affects the overall gain of the controller

and is normally set to the process value limits that the controller requires for normal operation.
For example if the control setpoint (

A

x.

SP

) is

70

and the

ctrI SPAN

is

20

and

A

x.

PG

is set

to

1.000

then an error of

20

from the setpoint will cause a 100% change in proportional control

output. For example with

A

x.

SP

at

70

,

ctrI SPAN

at

20

,

A

x.

PG

at

1.000

and

A

x

bS

at

0.000

a display reading of

50

or lower (

A

x.

SP

minus

ctrI SPAN

) the control output will be

at 100% i.e. the relay will be on continuously. The control output will then gradually adjust the
on/off time as the display value reaches the setpoint.
For instruments with more than one input where the number of decimal points displayed may vary
the control span will take on the value of the main display and so may or may not match the
decimal points shown in the input being controlled. e.g. a control span of 2.00 will act as a control
span of 20.0 if the input to be controlled is displayed with only 1 decimal point.

RM4IVMAN-2.1-0

39 of

49

Содержание RM4-IV

Страница 1: ...100mVDC 1VDC 10VDC or 100VDC or Slidewire Operation and Instruction Manual AMALGAMATED INSTRUMENT CO ABN 80 619 963 692 Unit 5 28 Leighton Place Hornsby Telephone 61 2 9476 2244 e mail sales aicpl com...

Страница 2: ...installation 5 3 Electrical installation 6 4 Function tables summary of setup functions 11 5 Explanation of functions 15 6 Calibration 34 7 Setting up the relay PI controller 38 8 Specifications 48 9...

Страница 3: ...power supply input voltage or current and optional retransmission output is provided by the RM4 thereby eliminating grounding and common voltage problems This isolation feature makes the RM4 ideal for...

Страница 4: ...ated transmitter supply excitation voltage 25mA max Not to be used with the standard 24VDC unregulated transmitter supply Isolated RS232 RS485 or RS422 serial communications 8 bit ASCII or Modbus RTU...

Страница 5: ...rd rails EN50022 Cut the DIN rail to length and install where required To install the instrument simply clip onto the rail as shown below To remove the instrument lever the lower arm downwards using a...

Страница 6: ...in this manual to confirm proper selection of voltage polarity and input type before applying power to the instrument When power is applied the instrument will cycle through a display sequence indica...

Страница 7: ...3 1 Signal input connections See section 3 3 for details of link settings RM4IVMAN 2 1 0 7 of 49...

Страница 8: ...8 of 49 RM4IVMAN 2 1 0...

Страница 9: ...2 I Remote input Choose momentary or latching switch to suit function selected 3 3 Configuring the input board Remove the circuit board from the case following the instructions below Link settings for...

Страница 10: ...10 of 49 RM4IVMAN 2 1 0...

Страница 11: ...eset time delay for the designated alarm relay x 0 to 9999 0 See 4 1 5 6 20 Axn o or Axn c Alarm relay x action to normally open de energised or normally closed energised Axn o or Axn c Axn o See 4 1...

Страница 12: ...CAL OFSt Calibration offset Any display value n a 5 23 25 ZERO RNGE Zero range limit Any display value or OFF OFF 5 24 25 CAL ZERO Zero reference point for ZERO RNGE operation n a n a 5 25 25 USER En...

Страница 13: ...5 38 31 dISP Display visual warning flashing mode FLSH or or FLSH 5 39 32 bAUd RAtE Baud rate for serial communications Optional 300 600 1200 2400 4800 9600 19 2 or 38 4 9600 5 40 32 PrtY Parity for s...

Страница 14: ...ally fitted Display Relay 1 Relay 2 Relay 3 Relay 4 AxLo AxHi AxHY Axtt Axrt Axn o or Axn c AxSP or Axt1 etc n a A1 A2 etc Ax OPEr n a n a Ax SP n a n a ctrI SPAN n a n a Ax PG n a n a Ax IG n a n a A...

Страница 15: ...Remove power from the instrument Hold in the button and reapply power The display will indicate as part of the wake up messages when the message is seen you can release the button 2 When the wake up m...

Страница 16: ...to the next setpoint Note this easy access also functions in the same manner for the PI control setpoint relay and or analog PI output if PI control is available The instrument must be set in the man...

Страница 17: ...lays and sets the low setpoint value for the designated alarm relay x Note x will be replaced by the relay number when displayed e g A1Lo for relay 1 Use this low setpoint function if a relay operatio...

Страница 18: ...the AxHi function and use the or v push buttons to set the value required then press F to accept this value The high alarm setpoint may be disabled by pressing the and v push buttons simultaneously W...

Страница 19: ...he input must rise above the setpoint value plus the hysteresis value to reset the alarm e g if A1Lo is to 20 0 and A1Hy is set to 10 0 then the alarm output relay will activate when the display value...

Страница 20: ...n then press F to accept this selection Example If set to A1n o alarm relay 1 will be open circuit when the display is outside alarm condition and will be closed short circuit across terminals when th...

Страница 21: ...sity This function is useful in reducing glare when the display needs to be viewed in both light and dark ambient light levels To set dull level go to the duLL function and use the or v push buttons t...

Страница 22: ...ption fitted Refer to the separate RM4 Din Rail Meter Optional Output Addendum booklet supplied when this option is fitted for wiring details and link settings Displays and sets the analog retransmiss...

Страница 23: ...resolution without loss of accuracy in ap plications where it is undesirable to display to a fine tolerance To set the display rounding value go to the drnd function and use the or v push buttons to...

Страница 24: ...put PI control Display rec ctrI Range on or OFF Default Value OFF Analog output mode seen only when analog output option is fitted This function allows selection of on or OFF for PI control analog out...

Страница 25: ...Range n a Default Value n a Zero point calibration for ZERO RNGE function see section 6 5 5 26 4mA input scale Display USER En4 Range Any display value Default Value n a 4mA input scale value use only...

Страница 26: ...display readings alternatively the display can be forced to return to live measurement by pressing the F To reset the peak memory hold the P pressed for 3 seconds or remove power to the display Lo Val...

Страница 27: ...alley memory The minimum value stored in memory will be displayed Otherwise operates in the same manner as the Hi function described above HiLo toggle between Hi and Lo displays This function allows t...

Страница 28: ...t the brGt function and the brightness level set at the duLL function 5 31 Access mode Display ACCS Range OFF EASY NONE or ALL Default Value OFF Access mode the access mode function ACCS has four poss...

Страница 29: ...lectrical input at that time irrespective of the 7 segment display value e g assume the remote input is set to tARE and A1Hi is set to 100 If the instrument is tared at a display reading of 30 then th...

Страница 30: ...nd retransmission can rise but not fall whilst the remote input switch is closed When the remote input switch is opened the retransmission value will remain fixed i e it will not rise or fall although...

Страница 31: ...50 then once the display reading falls below 50 the message or will flash on and off or the display value will flash on and off instead of the normal display units see dISP function 5 39 This message...

Страница 32: ...Set baud rate seen only with serial output option Refer to the separate RM4 Din Rail Meter Optional Output Addendum booklet supplied when optional outputs are fitted Select from 300 600 1200 2400 480...

Страница 33: ...fitted Allows several units to operate on the same RS485 interface reporting on different areas etc if RS485 is available The host computer or PLC may poll each unit in turn supplying the appropriate...

Страница 34: ...be present at the input terminals for CAL1 and CAL2 Note CAL1 and CAL2 can be set independently The procedure for entering the first scaling point CAL1 is as follows a Ensure that an input signal is...

Страница 35: ...utton to abort the scaling If the scaling has been accepted the CAL End message should be seen Example Flow chart showing scaling using two live inputs Enter via mode CAL Place at the input a low leve...

Страница 36: ...used instead of performing a two point calibration when a constant measurement error is found to exist across the entire range To perform a calibration offset press the and v buttons simultaneously at...

Страница 37: ...reading of 10 the zero range function will allow the display to zero only if the current display reading is between 490 and 510 To perform a calibration zero press the and v buttons simultaneously at...

Страница 38: ...ctions chapter for details of operation when Ax AL is selected If Ax tP is selected then the chosen relay will operate in pulse width control mode If Ax Fr is selected then the chosen relay will opera...

Страница 39: ...value defines the range over which the input must change to cause a 100 change in the control output when the proportional gain is set to 1 000 This function affects the overall gain of the controlle...

Страница 40: ...e setpoint The proportional gain action can be reversed by setting a negative gain i e with a negative gain the on time will reduce as the error increases With a proportional gain of 1 000 and an erro...

Страница 41: ...creasing as value approaches 80 Reading 80 or above relay permanently off 70 0 500 50 0 Reading 50 or below relay permanently on Reading 50 to 70 relay pulses with off time increasing as value approac...

Страница 42: ...on to try to correct at the rate of 20 per minute Too high an integral gain will result in instability To low an integral gain will slow down the time taken to reach the setpoint The optimum setting w...

Страница 43: ...ut bias setting to maintain the control process setpoint value For example with a bias Ax bs set at 50 minimum limit set at 20 and a maximum limit of 30 the actual bias when the process is at the setp...

Страница 44: ...ease the proportional gain until a steady process cycling is observed Once the steady cycling state is achieved note the difference between the display value and the control setpoint value Gradually i...

Страница 45: ...with PI pulse width control refer to the appropriate sections as shown below for these common functions Ax SP Control setpoint refer to section 7 2 ctrI SPAN Control span refer to section 7 3 Ax PG Pr...

Страница 46: ...ly off 70 0 500 50 0 Reading 50 or below relay pulses at maximum frequency Reading 50 to 90 relay pulses with frequency decreasing as value approaches 90 period increased by 50 at 70 compared to minim...

Страница 47: ...steady cycling state is achieved note the difference between the display value and the control setpoint value Gradually increase or decrease the bias value until the displayed value matches or cycles...

Страница 48: ...Form A rated 5A resistive Programmable N O or N C 8 2 Optional outputs Third relay Rated 0 5A resistive 30VAC or DC May be configured as form A or form C if the third relay is the only option fitted F...

Страница 49: ...the manu facturer freight paid and if accepted for free repair will be returned to the customers address in Australia free of charge When returning the product for service or repair a full descriptio...

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