RKC REX-C900 Instruction Manual

Digital Controller

REX-C100/C400/C410/C700/C900

INSTRUCTION MANUAL

Thank you for purchasing the RKC instrument. In order to achieve maximum performance and ensure proper operation of your new instrument, carefully read all the instructions in this manual. Please place this manual in a convenient location for easy reference.

• An external protection device must be installed if failure of this

instrument could result in damage to the instrument, equipment or injury to personnel.

• All wiring must be completed before power is turned on to prevent

electric shock, fire or damage to instrument and equipment.

• This instrument must be used in accordance with the specifications

to prevent fire or damage to instrument and equipment.

• This instrument is not intended for use in locations subject to

flammable or explosive gases.

• Do not touch high-voltage connections such as power supply

terminals, etc. to avoid electric shock.

• RKC is not responsible if this instrument is repaired, modified or

disassembled by other than factory-approved personnel. Malfunction can occur and warranty is void under these conditions.

• This is a Class A instrument. In a domestic environment, this

instrument may cause radio interference, in which case the user may be required to take adequate measures.

• This instrument is protected from electric shock by reinforced

insulation. Provide reinforced insulation between the wire for the input signal and the wires for instrument power supply, source of power and loads.

• Be sure to provide an appropriate surge control circuit respectively

for the following:

- If input/output or signal lines within the building are longer than 30 meters.

- If input/output or signal lines leave the building, regardless the length.

• This instrument is designed for installation in an enclosed

instrumentation panel. All high-voltage connections such as power supply terminals must be enclosed in the instrumentation panel to avoid electric shock by operating personnel.

• All precautions described in this manual should be taken to avoid

damage to the instrument or equipment.

• All wiring must be in accordance with local codes and regulations.

• All wiring must be completed before power is turned on to prevent

electric shock, instrument failure, or incorrect action. The power must be turned off before repairing work for input break and output failure including replacement of sensor, contactor or SSR, and all wiring must be completed before power is turned on again.

• To prevent instrument damage of failure, protect the power line and

the input/output lines from high currents with a protection device such as fuse, circuit breaker, etc.

• Prevent metal fragments or lead wire scraps from falling inside

instrument case to avoid electric shock, fire or malfunction.

• Tighten each terminal screw to the specified torque found in the

manual to avoid electric shock, fire or malfunction.

• For proper operation of this instrument, provide adequate

ventilation for heat dispensation.

• Do not connect wires to unused terminals as this will interfere with

proper operation of the instrument.

• Turn off the power supply before cleaning the instrument.

• Do not use a volatile solvent such as paint thinner to clean the

instrument. Deformation or discoloration will occur. Use a soft, dry cloth to remove stains from the instrument.

• To avoid damage to instrument display, do not rub with an abrasive

material or push front panel with a hard object.

• Do not connect modular connectors to telephone line.

WARNING

CAUTION

NOTICE

• This manual assumes that the reader has a fundamental knowledge

of the principles of electricity, process control, computer technology and communications.

• The figures, diagrams and numeric values used in this manual are

only for purpose of illustration.

• RKC is not responsible for any damage or injury that is caused as a

result of using this instrument, instrument failure or indirect damage.

• Periodic maintenance is required for safe and proper operation of

this instrument. Some components have a limited service life, or characteristics that change over time.

• Every effort has been made to ensure accuracy of all information

contained herein. RKC makes no warranty expressed or implied, with respect to the accuracy of the information. The information in this manual is subject to change without prior notice.

• No portion of this document may be reprinted, modified, copied,

transmitted, digitized, stored, processed or retrieved through any mechanical, electronic, optical or other means without prior written approval from RKC.

IMNZC21-E1

RKC INSTRUMENT INC.

1. PRODUCT CHECK

C100

(1) Control action

(2) Input type

- 

(1) (2) (3) (4) (6) (7)

F: PID action with autotuning (Reverse action) D: PID action with autotuning (Direct action) W: Heat/cool PID action with autotuning (Water cooling A : Heat/cool PID action with autotuning (Air cooling

(3) Range code

See “9. INPUT RANGE TABLE.”

(4) First control output [OUT1] (Heat-side)

M: Relay contact 8: Current (4 to 20 mA DC) V: Voltage pulse G: Trigger (for triac driving)

(5) Second control output [OUT2] (Cool-side)

No symbol: When control action is F or D. M: Relay contact V: Voltage pulse 8: Current (4 to 20 mA DC)

(6) Alarm 1 [ALM1], (7) Alarm 2 [ALM2]

N: No alarm H: Process high alarm A: Deviation high alarm J: Process low alarm B: Deviation low alarm K: Process high alarm with hold action C: Deviation high/low alarm L: Process low alarm with hold action D: Band alarm P: Heater break alarm (CTL-6 E: Deviation high alarm S: Heater break alarm (CTL-12 with hold action R: Control loop break alarm 5 F: Deviation low alarm with hold action G: Deviation high/low alarm with hold action

C100 cannot be specified in Heat/cool PID action.

For the C100, when control output is trigger output for triac driving, only the

ALM1 is available.

For the C100, there is no second control output.

Heater break alarm cannot be specified in case of ALM1. Also, it isn’t possible

to specify when control output is current output.

As control loop break alarm, only either the ALM1 or ALM2 is selected.

Check that power supply voltage is also the same as that specified when ordering.

 Mounting brackets (C100/C400/C410/C700/C900): 2

 Instruction manual (IMNZC21-E1): 1

C400 C410

- 

C700

(1) (2) (3) (4) (5) (6) (7)

C900

)

2. MOUNTING

2.1 Mounting Cautions

(1) This instrument is intended to be used under the following

environmental conditions. (IEC61010-1)

[OVERVOLTAGE CATEGORY II, POLLUTION DEGREE 2]

(2) Use this instrument within the following ambient temperature and

ambient humidity.

• Allowable ambient temperature: 0 to 50 °C

• Allowable ambient humidity: 45 to 85 % RH

(3) Avoid the following when selecting the mounting location.

• Rapid changes in ambient temperature which may cause

condensation.

• Corrosive or inflammable gases.

• Direct vibration or shock to the mainframe.

• Water, oil, chemicals, vapor or steam splashes.

• Excessive dust, salt or iron particles.

• Excessive induction noise, static electricity, magnetic fields or noise.

• Direct air flow from an air conditioner.

• Exposure to direct sunlight.

• Excessive heat accumulation.

2.2 Dimensions

(

)

C100

(Unit: mm)

C400

(Unit: mm)

C410

(Unit: mm)

8 100

(53)

12 100

100

44 44

100

+0.8 0

+ 0.6

+0.6 0

+ 0.6

+0.8

2.3 Mounting procedures

 C100  When the controllers are mounted on

Mounting bracket

panel with 1 to 5 mm in thickness

Since the mounting brackets are already installed on the controller, insert the controller into the panel front without removal of the brackets.



When the controllers are mounted on panel with 5 to 9 mm in thickness

Remove the mounting brackets from the controller with a slotted screwdriver. Engage each mounting bracket with holes marked with 5-9 on the housing and then insert the controller into the panel from the panel front.

Mounting bracket

Hole for 5 to 9 mm

Hole for 1 to 5 mm

 C400/C410/C700/C900

1. Prepare the panel cutout as specified in 2.2 Dimensions.

2. Insert the instrument through the panel cutout.

3. Insert an upper mounting bracket along the bracket insertion groove from the back, and then engage a projection at the bracket end with a recess at the groove front and also insert metal fitting legs into slots.

4. Tighten a bracket setscrew from the rear of the bracket with Phillips screwdriver. Do not overtighten the bracket setscrew.

5. The other mounting bracket should be installed the same way described in 3. and 4.

C900 is used in the above figures for explanation, but the same mounting procedures also apply to C400/C410/C700.

Insertion recess

Bracket insertion groove

Slot

Bracket setscrew

3. WIRING

+0.6

+0.7 0

To prevent electric shock or instrument failure, do not turn on the power until all the wiring is completed.

WARNING

3.1 Wiring Cautions

• For thermocouple input, use the appropriate compensation wire.

• For RTD input, use low resistance lead wire with no difference in resistance

between the three lead wires.

• To avoid noise induction, keep input signal wire away from instrument

power line, load lines and power lines of other electric equipment.

+0.7

+0.8

• If there is electrical noise in the vicinity of the instrument that could affect

operation, use a noise filter.

- Shorten the distance between the twisted power supply wire pitches to achieve the most effective noise reduction.

- Always install the noise filter on a grounded panel. Minimize the wiring distance between the noise filter output and the instrument power supply terminals to achieve the most effective noise reduction.

- Do not connect fuses or switches to the noise filter output wiring as this will reduce the effectiveness of the noise filter.

Instrument power

• Power supply wiring must be twisted and have a low voltage drop.

• About 5 to 6 seconds are required as preparation time for contact output

every time the instrument is turned on. Use a delay relay when the output line, is used for an external interlock circuit.

• This instrument is not furnished with a power supply switch or fuses.

Therefore, if a fuse or power supply switch is required, install close to the instrument.

- Fuse type: Time-lag fuse

- Recommended fuse rating: Rated voltage 250 V Rated current: 1 A

• For an instrument with 24 V power supply, supply power from a SELV

circuit.

Shorten distance between pitches

Twist these liadwires

Noise filter

OUT

Minimize distance

Instrument Power terminals

IMNZC21-E1

C700

(Unit: mm)

100

67.6

C900

(Unit: mm)

Panel thickness: 1 to 5 mm or 5 to 9 mm (C100) 1 to 8 mm (C400/C410/C700/C900)

100

+0.8 0

100

3.2 Terminal Configuration

C100

larm 1 or Control loop break alarm

larm 2, Heater break alarm or Control loop break alarm

Trigger for triac drive

OUT

NO: Normally open

C400, C410, C900

NO: Normal ly open NC: Normally closed

Trigger for triac drive

OUT

F, D action types

C700

NO: Normally open NC: Normally closed

Trigger for triac drive

OUT

F, D action types

 Specifications

Input:

Input type:

Thermocouple: K, J, R, S, B, E, T, N, PLII,

RTD: Pt100, JPt100 Voltage: 0 to 5 V DC, 1 to 5 V DC

Current: 0 to 20 mA DC, 4 to 20 mA DC

Sampling cycle: Input range: See Input range table

Control method:

ON/OFF, P, PI, or PD actions is available

Control output:

Relay contact output: 250 V AC, 3A (Resistive load) Electrical life: 300,000 times or more (Rated load) Voltage pulse output: 0/12 V DC (Load resistance 600 Ω or more) Current output: 4 to 20 mA DC

Trigger output (for triac driving): Zero cross method for medium capacit

Load voltage used:

Load used: Resistive load

IMNZC21-E1

Alarm output

Relay contact

ALM1

ALM2

Control output

Voltage puls e/

Current

OUT

Voltage pulse/

Current

OUT

Voltage pulse/

Current

OUT

Relay contact

OUT

24V

Relay contact

OUT

24V

Voltage pulse/

Current

OUT2

− +

OUT1

−

W, A action types

24V

Relay contact

−

OUT

24V

Voltage pulse/

Current

OUT2

− +

OUT1

−

W, A action types

W5Re/W26Re, U, L Input impedance: Approx. 1 MΩ

Input impedance: 250 kΩ or more Input impedance: Approx. 250 Ω

0.5 seconds

PID control

(Load resistance 600 Ω or less)

triac driving (100 A or less)

100 V AC line, 200 V AC line

CT input

Current transformer

11 12

Power supply

−

Control output

Power supply

−

Control output

Ground

100−240V

Relay contact

OUT2

OUT1

Ground

100−240V

Relay contact

OUT2

OUT1

Power supply

100−240V

24V

−

24V

Input

TC input

−

RTD input

RTD

Voltage/Cur rent

−

5 6

Input

TC input

−

17 18

21 22 23

RTD input

RTD

9 10 11

14 15 16

CT input

Current transformer input

Voltage/Current

−

Input

TC input

−

Alarm output:

Relay contact output: 250 V AC, 1A (Resistive load)

Heater break alarm function:

Measured current: 0 to 30 A (CTL-6-P-N) 0 to 100 A (CTL-12-S56-10L-N) Input rating: Maximum current rating: 120 mA Input impedance: Approx. 2.5 Ω

Performance:

Display accuracy (at the ambient temperature 23 °°°°C ±±±± 2 °°°°C):

Thermocouple:

± (0.5 % of display value + 1 digit) or ± 3 °C [6 °F] Whichever is greater R and S input: 0 to 399 °C [0 to 799 °F]: ± 6 °C [12 °F] B input: 0 to 399 °C [0 to 799 °F]: Accuracy is not guaranteed.

RTD: ± (0.5 % of display value + 1 digit) or ± 0.8 °C [1.6 °F] whichever is greater

Voltage/Current: ± (0.5 % of span + 1 digit)

RTD input

RTD

Voltage/Current

CT input

Current transformer input

−

Electrical life: 50,000 times or more (Rated load)

Alarm output

•

Terminals whic h are not used acc ording to the controller ty pe are all removed.

•

An example of the C900 is described here, the same wiring examples also apply to C400/C410. (Terminal numbers 17 to 24 are not provided for C400/C410.)

•

Use the solder less terminal appropriate to the screw size.

Recommended tightening torque:

0.4 Nm [4 kgfcm] Maximum allowan ce: 1.0 Nm [10 kgfcm]

Alarm output

•

Recommended tightening torque:

0.4 Nm [4 kgfcm] Maximum all owance: 1.0 Nm [10 kgfcm]

Screw size: M3 x 6 Terminals Nos. 1 to 10 (Power terminal s, Alarm terminals and Out

•

Terminals whic h are not u sed accordi ng to the controller type are all removed.

•

When cont rol output is t rigger outpu t for tria c driving, the n umber of alar m output point s becomes 1.

•

Use the sol derless ter minal appropri ate to

the screw size. Screw size: M3 x 6 Recommended tightening torque:

0.4 Nm [4 kgfcm] Maxim um allowance: 0.7 Nm [7 kgfcm]

6.2 mm (0.24 inch) or less

Relay contact

ALM1

ALM2

Relay contact

ALM1

ALM2

Terminals which are not used according to the control ler type ar e all removed. Use the solderless terminal appropriate to the screw size.

6.2 mm (0.24 inch) or less

Screw size: M3 x 8

Memory backup:

Power:

Power supply voltage:

Power consumption:

6 VA max. (at 100 V AC) 9 VA max. (at 240 V AC) 6 VA max. (at 24 V AC) 145 mA max. (at 24 V DC)

Weight:

C100: Approx. 170 g C700: Approx. 250 g C400/C410: Approx. 260 g C900: Approx. 340 g

larm 1 or Control loop break alarm

larm 2, Heater break alarm or Control loop break alarm

8.1 mm (0.32 inch) or les s

larm 1 or Control loop break alarm

larm 2, Heater break

alarm or Control loop break alarm

Screw size: M3 x 8 Terminals Nos. 11 to 13

ut terminals)

Backed up by Nonvolatile Memory Number of write times: Approx. 100,000 times Data storage period: Approx. 10 years

85 to 264 V AC (Power supply voltage range), 50/60 Hz Rating: 100 to 240 V AC

21.6 to 26.4 V AC (Power supply voltage range), 50/60 Hz Rating: 24 V AC

21.6 to 26.4 V DC (Power supply voltage range) Rating: 24 V DC

(Input terminals)

8.1 mm (0.32 inch) or less

4. PARTS DESCRIPTION

(3)

ALM1

ALM2

OUT

(4)

SET

C100

REX-

(5) (6) (7)

(1)

(2)

C400

OUT1

ALM1

ALM2

OUT2

SET

REX-

(5) (6) (7)

Measured value (PV) display [Green]

(1)

Displays PV or various parameter symbols.

(2) Set value (SV) display [Orange]

Displays SV or various parameter set values (or CT input value).

Indication lamps

(3) Alarm output lamps (ALM1, ALM2) [Red]

ALM1: Lights when alarm 1 output is turned on. ALM2: Lights when alarm 2 output is turned on.

5. SETTING

(3)

OUT1

(1)

(2)

(3)

OUT2

SET

(4)

C400

Autotuning (AT) lamp [Green]

Flashes when autotuning is activated. (After autotuning is completed: AT lamp will become OFF)

Control output lamps (OUT1 [Yellow], OUT2 [Green])

OUT1: Lights when control output is

turned on.*

OUT2: Lights when cool-side control

output is turned on.

OUT2

OUT1

SET

C700, C900

ALM1

ALM2

(1)

(2)

(3)

C900

REX-

C410 (1)

(2)

(3)

ALM1

ALM2

REX-

(5) (6) (7)

C410

(4) (5) (6) (7)

SET

(4) (Set key) Used for parameter calling up

and set value registration.

(5) (Shift key) Shift digits when settings are

changed.

To avoid damage to the instrument, never use a sharp object to press keys.

(6) (DOWN key)

Decrease numerals.

(7) (UP key) Increase numerals.

5.1 Operation Menu

The controller will display the measured value (PV) and the set value (SV).

This is the mode used to set the SV.

Factory set value: 0 °C [°F] or 0.0 °C [°F]

Power ON

Input type and Input range Display

PV/SV Display Mode

This instrument returns to the PV/SV display mode if no key operation is performed for more than one minute.

utomatically

(in 4 sec.)

Press the SET key

SV Setting Mode

SV setting

Press the SET key for 2 seconds.

This mode is used to set the parameters such as alarms, PID constants, etc. (See 5.2 Parameter List.) The followin

(CT)

(AL1)

(AL2)

(HbA)

parameter symbols are displayed as the SET key is pressed.

Current transformer (CT) input value monitor

SET key

Alarm 1 set value (ALM1)

SET key

Alarm 2 set value (ALM2)

SET key

Heater break alarm (HBA) set value

SET key

Parameters which are not related to existing functions on the controller are not displayed.

(LbA)

(Lbd)

(ATU)

(P)

Parameter Setting Mode

Control loop break alar m (LB A) t ime

SET key

LBA deadband

SET key

Autotuning (AT)

SET key

Proportional band

SET key

(I)

(D)

(Ar)

(T)

Integral time

SET key

Deriva tive ti me

SET key

Anti-reset windup

SET key

Heat-side proportioning

SET key

* These parameter are not displayed

Return to the first parameter

in C100 controller.

(Pc)

(db)

(t)

(LCK)

Cool-side proportioning band *

SET key

Deadband *

SET key

Cool-side proportioning

cle *

SET key

Set data lock

SET key

 Input type and input range display

This instrument immediately confirms the input type symbol and input range following power ON. Example: When sensor type of input is K thermocouple.

Symbol

Automatically

Input type symbol *

Unit for input and SV display (Celsius: °C, Fahrenheit: °F, Voltage/current input: no character shown)

Input range high

Input range low

* Input Type Symbol Table

Symbol

Input type

K J R S B E T N PL II

Thermocouple (TC) RTD

JPt

W5Re/ W26Re

U L

100

Voltage

input

Current

input

5.2 Parameter List

The following parameter symbols are displayed as the SET key is pressed.

Parameter symbols which are not related to existing functions on the controller are not displayed.

Symbol Name Setting range Description Factory set value

Current transformer (CT) input

value monitor

Alarm 1 set value (ALM1)

Alarm 2 set value (ALM2)

0.0 to 100.0 A [Display only]

Temperature input: Deviation alarm, Process alarm:

−1999 to +9999 °C [°F] or

−199.9 to +999.9 ° C [°F] Voltage/current inputs: Deviation alarm: −199.9 to +200.0 % Process alarm: −199.9 to +300.0 %

Display input value from the current transformer. [Displayed only when the instrument has the heater break alarm]

Set the alarm 1 set value and alarm 2 set value.

For the alarm action type, see page 7.

Alarm differential gap: Temperature input: 2 or 2.0 °C [°F] Voltage/current inputs: 0.2 % of span

Temperature input: 50 (50.0)

Voltage/current inputs:

5.0

IMNZC21-E1

ature

Symbol Name Setting range Description Factory set value

Heater break alarm (HBA) set

value Control loop break

alarm (LBA) time

LBA deadband 3

0.0 to 100.0 A Alarm value is set by referring to input value

0.1 to 200.0 minutes Set control loop break alarm set value. 8.0

Temperature input: 0 to 9999 °C [°F] Voltage/current inputs: 0 to 100 % of span

Autotuning (AT) 0: AT end or cancel

1: AT start or execution

Proportional band Temperature input:

1 (0.1) to span

0.1 °C [°F] resolution: Within 999.9 °C [°F]

Voltage/current inputs:

0.1 to 100.0 % of span

Integral time 1 to 3600 seconds

(0 second: PD action)

Derivative time 1 to 3600 seconds

(0 second: PI action)

Anti-reset windup (ARW)

Heat-side proportioning cycle

Cool-side proportional band

Deadband Temperature input:

1 to 100 % of heat-side proportional band (0 %: Integral action OFF)

1 to 100 seconds (Not displayed if the control output is

current output.)

1 to 1000 % of heat-side proportional band

−10 to +10 °C [°F] or

−10.0 to +10.0 °C [°F] Voltage/current inputs:

−10.0 to +10.0 % of span

Cool-side proportioning cycle

Set data lock (LCK)

1 to 100 seconds (Not displayed if the control output is current output.)

0100: No set data locked (All parameters changeable)

0101: Set data locked (All parameters locked)

0110: Only the set value (SV) is changeable with the set data locked

Heater Break Alarm (HBA) function

The HBA function monitors the current flowing through the load by a dedicated current transformer (CT), compares the measured value with the HBA set value, and detects a fault in the heating circuit.

Low or No current flow (Heater break, malfunction of the control device, etc.):

When the control output is ON and the current transformer input value is equal to or less than the heater break determination point for the preset number of consecutive sampling cycle, an alarm is activated.

Over current or short-circuit:

When the control output is OFF and the current transformer input value is equal to or greater than the heater break determination point for the preset number of consecutive sampling cycle, an alarm is activated.

Precaution for HBA setting:

• Displayed only for when HBA is selected as Alarm 2.

• HBA is not available on a current output.

• Set the set value to approximately 85 % of the maximum reading of the

CT input.

• Set the set value to a slightly smaller value to prevent a false alarm if

the power supply may become unstable.

• When more than one heater is connected in parallel, it may be

necessary to increase the HBA set value to detect a single heater failure.

• When the current transformer is not connected or the HBA set value is

set to “0.0”, the HBA is turned on.

Control Loop Break Alarm (LBA) function

The LBA function is used to detect a load (heater) break or a failure in the external actuator (power controller, magnet relay, etc.), or a failure in the control loop caused by an input (sensor) break. The LBA function is activated when control output reaches 0 % or 100 %. LBA monitors variation of the measured value (PV) for the length of LBA time. When the LBA time has elapsed and the PV is still within the alarm determination range, the LBA will be ON.

IMNZC21-E1

from the current transformer (CT). Used only for single-phase.

Set the area of not outputting LBA. No LBA deadband functions with 0 set. Differential gap : Temperature input: 0.8 °C [°F ] Voltage/current inputs: 0.8 % of span

Turns the autotuning ON/OFF. 0

Set when PI, PD or PID control is performed. Heat/cool PID action: Proportional band

setting on the heat-side. ON/OFF action control when set to 0 (0.0).

ON/OFF action differential gap: Temperature input: 2 (0.2) °C [°F ]

Temperature input: 30 (30.0)

Voltage/current inputs:

3.0

Voltage/current inputs: 0.2 % of span Set the time of integral action to eliminate the

offset occurring in proportional control. Set the time of derivative action to improve

control stability by preparing for output changes.

Overshooting and undershooting are restricted by the integral effect.

Set control output cycle. Heat/cool PID action:

Heat-side proportioning cycle

Relay contact output: 20

Voltage pulse output/ Trigger output for triac driving: 2

Set cool-side proportional band when heat/cool PID action.

Set control action deadband between heat-side and cool-side proportional bands.

Minus (−) setting results in overlap.

Set control cool-side output cycle for heat/cool PID action.

Relay contact output: 20 Voltage pulse output: 2

Performs set data change enable/disable. 0100

Precaution for LBA setting:

• Displayed only for when LBA is selected as Alarm 1 or Alarm 2.

• No control loop break alarm can be used at heat/cool PID control

action.

• The LBA function can not be activated when AT function is turned on.

• The LBA function is activated when control output reaches 0 % or

100 %. The time required for the LBA output to turn on includes both the time from the initial occurrence of loop failure and the LBA setting time. Recommended setting for LBA is for the set value of the LBA to be twice the value of the integral time (I).

• If LBA setting time does not match the controlled object requirements,

the LBA selling time should be lengthened. If setting time is not correct, the LBA will malfunction by turning on or off at inappropriate times or not turning on at all.

LBA Deadband function

The LBA may malfunction due to external disturbances. To prevent malfunctioning due to external disturbance, LBA deadband (LBD) sets a neutral zone in which LBA is not activated. When the measured value (PV) is within the LBD area, LBA will not be activated. If the LBD setting is not correct, the LBA will not work correctly.

LBD differential gap*

Non-alarm area

Alarm area Alarm area

Low High

A: During temperature rise: Alarm area During temperature fall: Non-alarm area

B: During temper

* TC and RTD inputs: 0.8 °C [°F] (fixed) Voltage/Current inputs: 0.8 % of span (fixed)

A B

Set value (SV) LBD set value

B: During temperature rise: Non-alarm area

rise: Non-alarm area

During temperature fall: Alarm area

0.0

240

100

0 or 0.0

5.3 Changing Parameter Settings

Procedures to change parameter settings are shown below.

To store a new value for the parameter, always press the SET key.

The display changes to the next parameter and the new value will be stored.

A new value will not be stored without pressing SET key after the new

−

value is displayed on the display. After a new value has been displayed by using the UP and DOWN keys,

−

the SET key must be pressed within one minute, or the new value is not stored and the display will return to the PV/SV monitor screen.

”"

Change the set value (SV)

Change the set value (SV) from 0

1. Select the SV setting mode

Press the SET key at PV/SV monitor screen until SV setting screen is displayed.

PV/SV monitor display

(PV/SV display mode)

2. Shift the high-lighted digit

Press the shift key to high-light the hundreds digit. The high-lighted digit indicates which digit can be set.

3. Change the set value

Press the UP key to change the number to 2.

4. Store the set value

Press the SET key to store the new set value. The display returns to the PV/SV monitor screen.

”"

Change parameters other than the set value (SV)

The changing procedures are the same as those of example 2 to 4 in the above "” end shifts to the next parameter. When no parameter setting is required, return the instrument to the PV/SV display mode.

Change the set value (SV)

°°°°

C to 200

°°°°

". Pressing the SET key after the setting

PV/SV monitor display (PV/SV display mode)

SV setti ng display (SV setting mode)

6. OPERATION

”"

All mounting and wiring must be completed before the power is turned on. If the input signal wiring is disconnected or short-circuited (RTD input only), the instrument determines that burnout has occurred.

−

Displays:

Upscale: Thermocouple input, RTD input (when input break)

•

Downscale: Thermocouple input (specify when ordering),

•

RTD input (when short-circuited), Voltage input (1 to 5 V DC), Current input (4 to 20 mA DC)

For the voltage (0 to 5 V DC) or current (0 to 20 mA DC) input, the

•

display becomes indefinite (display of about zero value).

−

Outputs:

Control output: OFF (Heat/Cool control: the control output on

•

both heat-side and cool-side is turned off)

Alarm output: Both of the Alarm 1 and Alarm 2 outputs of this

•

”"

A power failure of 20 ms or less will not affect the control action. When a power failure of more than 20 ms occurs, the instrument assumes that the power has been turned off. When power returns, the controller will retain the conditions that existed prior to shut down.

”"

The alarm hold action is activated when not only the power is turned on, but also the SV is chan

CAUTIONS

instrument are turned on when burnout occurs regardless of any of the following actions taken. (High alarm, low alarm, etc.) In addition, when used for any purposes other than these alarms (event, etc.), specify the Z-124 specification (not to be forcibly turned on).

6.1 Operating Precautions

(1) All mounting and wiring must be completed before the power is turned on. (2) The settings for the SV and all parameters should be appropriate for the

controlled object.

(3) A power supply switch is not furnished with this instrument. It is ready to

operate as soon as the power is turned on.

6.2 Set Data Lock (LCK) Function

The set data lock restricts parameter setting changes by key operation. This function prevents the operator from making errors during operation.

Set value

0100 All parameters [Factory set value] 0101 No parameters [All Locked] 0110 SV

Parameters protected by Set Data Lock function are still displayed for monitoring.

Parameters which can be changed

ed.

6.3 Autotuning (AT) Function

Autotuning (AT) automatically measures, calculates and sets the optimum PID and LBA constants. The following conditions are necessary to carry out autotuning and the conditions which will cause the autotuning to stop.

Caution for using the Autotuning (AT) When a temperature change (UP and/or Down) is 1 minute during Autotuning, Autotuning may be cancelled before calculating PID values. In that case, adjust the PID values manually. It is possible to happen when the set value is around the ambient temperature or is close to the maximum temperature achieved by the load.

"

Requirements for AT star t

Start the autotuning when all following conditions are satisfied:

Prior to starting the AT function, end all the parameter settings other than PID

•

and LBA. Confirm the LCK function has not been engaged.

•

When the autotuning is finished, the controller will automatically returns to PID control.

"

Requirements for AT cancellation

The autotuning is canceled if any of the following conditions exist.

When the set value (SV) is changed.

•

When the PV bias value is changed.

•

When the PV becomes abnormal due to burnout.

•

When the power is turned off.

•

When power failure longer than 20 ms occurs.

•

If the AT is canceled, the controller immediately changes to PID control. The PID values will be the same as before AT was activated.

When AT is completed, the controller immediately changes to PID control. If the control system does not allow the AT cycling process, set each PID constant manually to meet the needs of the application.

°°°°

C or less per

7. INITIAL SETTING

Parameters in the Initialization mode should be set according to the application before setting any parameter related to operation. Once the Parameters in the Initialization mode are set correctly, those parameters are not necessary to be changed for the same application under normal conditions. If they are changed unnecessarily, it ma y result in malfunction or failure of the instrument. RKC will not bear any responsibility for malfunction or failure as a result of improper changes in the Initialization mode.

7.1 Go to Initialization Mode

Turn on the power to this controller. The instrument goes to the PV/SV

display after confirming input type symbol and input range. Press the SET key for five seconds to go to the Parameter Setting Mode

from the PV/SV displ ay. Press the SET key until “LCK” (Set Data Lock display) will be displayed.

The high-lighted digit indicates which digit can be set. Press shift key to

high-light the hundreds digit. (The section in each image of the controller shows the digits which are not high-lighted.)

Press the DOWN key to change 1 to 0.

Press the SET key to store the new set value. The display goes to the

next parameter, and the Initialization mode is unlocked.

Press the shift key for five seconds while pressing the SET key to go to

the Initialization Mode. When the controller goes to the Initialization Mode, “SL1” will be displayed.

CT1 input value display

If the control is set to the initial set mode, all outputs are turned OFF.

7.2 Exit Initialization Mode

When any parameter setting is changed in the Initialization Mode, check all parameter set values in SV Setting Mode and Parameter Setting Mode.

Press the shift key for five seconds while pressing the SET key from any

display in the Initialization Mode. The controller goes back to the operation mode and the PV/SV display will be displayed. Press the SET key for five seconds in the PV/SV display.

Press the SET key until “LCK” (Set Data Lock display) will be displayed.

The high-lighted digit indicates which digit can be set. Press shift key to

high-light the hundreds digit.

Press the SET key to store the new set value. The display goes to the

next parameter, and the Initialization mode is locked.

WARNING

Set data lock functi on display

Set value 0: Initialization mode unlocked 1: Initialization mode locked

CT1 input value display

The parameter displayed varies on the instrument specification.

Initialize code selection display of initialization mode

Set data lock functi on display

CT1 input value display

The parameter displayed varies on the instrument specification.

IMNZC21-E1

7.3 Initial Setting Menu

Display flowcharts in Initialization mode are shown in the following.

Do not change to the section parameters and any parameter in the Initialization mode which is not described in the initial setting menu below. It may result in malfunction or failure of the instrument.

PV/SV display mode or Parameter setting mode

Press the shift key while pressing the SET key for five seconds with the unlocked.

Input type selection

(SL1)

SET key

Temperature unit and

(SL4)

(SL5)

cooling type selection

SET key

selection

SET key

selection

SET key

larm1 type

larm2 type

SET key

(Pb)

(oH)

(AH1)

(AH2)

(SLH)

(SLL)

SET key

PV bias

SET key

ON/OFF action differential gap

SET key

larm 1 differential gap

SET key

larm 2 differential gap

SET key

Setting limiter [high]

SET key

Setting limiter [low]

SET key

7.4 Input Type Selection (SL1)

When any parameter setting is changed in the Initialization Mode, check all parameter set values in SV Setting Mode and Parameter Setting Mode.

Factory set value varies depending on the input type.

Set value Input type Hardware

0000 K 0001 J 0010 L 0011 E 0100 N 0111 R

Thermocouple

1000 S

(TC)

1001 B 1010 W5Re/W26Re 1011 PL II 0101 T 0110 U 1100 Pt100 Ω (JIS/IEC) 1101 JPt100 Ω (JIS) 1110 1111 1110 1111

Conduct setting so as to meet the instrument specification (input type). Setting change between different symbols may cause malfunction, but the setting can be changed when hardware types have the same symbol. However, when the setting is changed, always reset “SLH” and “SLL” (See page 8).

0 to 5 V DC 1 to 5 V DC 0 to 20 mA DC 4 to 20 mA DC

RTD C

Voltage D

Current E

 Change Settings

Example: Change the input type from “K” to “J”

1. Press the SET key. The display will go to SL1.

2. Press the UP key to change the number to 1.

3. Press the SET key to store the new set value.

The display goes to the next parameter.

Input type selection

7.5 Temperature Unit and Cooling Type Selection (SL2)

Inappropriate settings may result in malfunction. Control type between Heat Only and Heat/Cool cannot be changed by this parameter.

IMNZC21-E1

Factory set value varies depending on the instrument specification.

Set

value

Temperature

unit

Description

Cooling type selection

0000 °C Air cooling (A type) or Heat only type (F, D type) 0001 °F Air cooling (A type) or Heat only type (F, D type) 0010 °C Water cooling (W type) 0011 °F Water cooling (W type)

 Change Settings

Example: Change the temperature unit of the Heat only type from “°

1. Press the SET key until SL2 is displayed.

2. Press the UP key to change the number to 1.

3. Press the SET key to store the new set value. The display goes to the

next parameter.

C (0000)” to “°F (0001)”

7.6 Alarm 1 [ALM1] Type Selection (SL4) Alarm 2 [ALM2] Type Selection (SL5)

If the alarm function is not provided with the instrument when shipped from the factory, no alarm output is available by changing SL4 and/or SL5.

SL4 is set to 0000 in the following cases.

• When the instrument does not have ALM1 output

• When Control Loop Break Alarm (LBA) is provided and assigned

to ALM1

SL5 is set to 0000 in the following cases.

• When the instrument does not have ALM2 output

• When Control Loop Break Alarm (LBA) is provided and assigned

to ALM2

• When the SV alarm is provided and assigned to ALM2

• When the Heater Break Alarm (HBA) is provided

Factory set value varies depending on the instrument specification.

Set value Details of setting

0000 No alarm 0001 Deviation high alarm 0101 Deviation low alarm 0010 Deviation high/low alarm 0110 Band alarm 0011 Process high alarm 0111 Process low alarm 1001 Deviation high alarm with hold action * 1101 Deviation low alarm with hold action * 1010 Deviation high/low alarm with hold action * 1011 Process high alarm with hold action * 1111 Process low alarm with hold action *

* Hold action: When Hold action is ON, the alarm action is suppressed at start-up or the control set value change until the measured value enters the non-alarm range.

 Alarm action type

Both of the Alarm 1 and Alarm 2 outputs of this instrument are turned on when burnout occurs regardless of any of the following actions taken (High alarm, low alarm, etc.). In addition, when used for any purposes other than these alarms (event, etc.), specify the Z-124 specification (not to be forcibly turned on).

Deviation high alarm

(Alarm set v alue is greater than 0.)

(Alarm set v alue is less than 0.)

Deviation low alarm

(Alarm set v alue is greater than 0.)

(Alarm set value is less than 0.)

OFF ON

Low High

OFF ON

Low High

Low

OFF

Deviation high/low alarm

Low High

Band alarm

Low

High

Process high alarm

Low High

Process low alarm

ON OFF

Low High

OFFON

( : SV : Alarm set v alue)

OFF ONON

OFF OFFON

OFF ON

High

 Change Settings

Example: Change the ALM1 type from “Deviation high alarm (0001)” to “Deviation low alarm (0101)”

1. Press the SET key three times at SL1 until SL4 is displayed.

2. Press the shift key to high-light the hundreds digit.

3. Press the UP key to change the number to 1.

4. Press the SET key to store the new set value.

The display goes to the next parameter.

7.7 PV bias (Pb)

The value set in the PV bias is added to the input value (actual measured value) to correct the input value. The PV bias is used to correct the individual variations in the sensors or when there is difference between the measured values (PV) of other instruments. Setting range: Temperature input: −1999 to +9999 °C [°F] or

Voltage/current inputs: −199.9 to +200.0 % Factory set value: Temperature input: 0 °C [°F] or 0.0 °C [°F]

−199.9 to +999.9 °C [°F]

Voltage/current inputs: 0.0 %

Continued on the next page.

Continued from the previous page.

 Change Settings

Example: When the temperature is measured by two instruments

When the measured values (PV) are as shown in the following: Main unit = 198 °C Recorder = 200 °C If a PV bias correction value of +2 °C is added to the measured value the

main unit, the displayed value become: Displayed value = Measured value (PV) + PV bias = 198 °C + 2 °C = 200 °C The setting procedures is described in the following.

1. Press the SET key at “Pb” is displayed.

2. Press the UP key to change the number to 2.

3. Press the SET key to store the new set value.

The display goes to the next parameter.

7.8 ON/OFF Action Differential Gap (oH)

Setting range: Temperature input: 0 to 100 °C [°F] or

Voltage/current inputs: −199.9 to +200.0 % Factory set value: Temperature input: 2 °C [°F] or 2.0 °C [°F]

 Change Settings

Example: Change the On/Off Action differential gap from “2 °

1. Press the SET key at “oH” is displayed.

2. Press the UP key to change the number to 4.

3. Press the SET key to store the new set value. The display goes to the

next parameter.

0.0 to 100.0 °C [°F]

Voltage/current inputs: 0.2 % of span

C” to “4 °C”

7.9 Alarm 1 Differential Gap (AH1)

Alarm 2 Differential Gap (AH2)

Setting range: Temperature input: 0 to 100 °C [°F] or

Voltage/current inputs: 0.0 to 10.0 % Factory set value: Temperature input: 2 °C [°F] or 2.0 °C [°F]

 Change Settings

Example: Change the Alarm 1 differential gap from “2 °

1. Press the SET key at “AH1” is displayed.

2. Press the UP key to change the number to 4.

3. Press the SET key to store the new set value. The display goes to the

next parameter.

0.0 to 100.0 °C [°F]

Voltage/current inputs: 0.2 % of span

C” to “4 °C”

7.10 Setting Limiter [High] (SLH)

Setting Limiter [Low] (SLL)

For voltage or current input, set scaling within the input range.

See 9. INPUT RANGE TABLE.

Factory set value varies depending on the instrument specification.

Input type Setting range *

K 0 to 1372 °C 0 to 2502 °F J 0 to 1200 °C 0 to 2192 °F R 0 to 1769 °C 0 to 3216 °F S 0 to 1769 °C 0 to 3216 °F B 0 to 1820 °C 0 to 3308 °F

TC E 0 to 1000 °C 0 to 1832 °F

N 0 to 1300 °C 0 to 2372 °F T −199.9 to +400.0 °C −199.9 to +752.0 °F W5Re/W26Re 0 to 2320 °C 0 to 4208 °F PLII 0 to 1390 °C 0 to 2534 °F U −199.9 to +600.0 °C −199.9 to +999.9 °F L 0 to 800 °C 0 to 1600°F

RTD Pt100 −199.9 to +649.0 °C −199.9 to 999.9 °F

JPt100 −199.9 to +649.0 °C

* Limit setting becomes SLH ≥ SLL.

When changing the high-limit (SLH) and the low-limit (SLL) limiter settings, always set the set-value (SV) within the limiter range.

 Change Settings

Example: The input range (input scale range) is from 0.0 to 100.0 °C,

the setting limiter (high) is 80.0 °

0.0 °C

Setting range

80.0 °C

Setting limiter

(high)

100.0 °C

1. Press the SET key at “SLH” is displayed.

2. Press the shift key to high-light the tens digit.

3. Press the DOWN key to change the number to 8.

Setting limiter [high] displa

4. Press the SET key to store the new set value. The display goes to the next parameter.

8. ERROR DISPLAYS

 Error display

 Overscale and Underscale

Measured value (PV)

[Flashing]

RAM failure (Incorrect set data write, etc.)

PV is outside of input range.

Overscale: PV is above the high input display range limit.

Underscale: PV is below the low input display range limit.

Turn off the power once. If an error occurs after the power is turned on again, please contact RKC sales office or the agent.

Check input type, input range, sensor and sensor connection.

WARNING

To prevent electric shock, always turn off the power before replacing the sensor.

9. INPUT RANGE TABLE

TC/RTD

Input type Range Code Range Code Range Code

W5Re/W26Re

−199.9 to +649.0 °C D 01 −199.9 to +200.0 °C D 02 −100.0 to +50.0 °CD03

Pt100

RTD

0 to 399 °C [0 to 799 °F]: ±6 °C [12 °F]

0 to 399 °C [0 to 799 °F]: Accuracy is not guaranteed.

Voltage/current inputs



Type Range Code Type Range Code

0 to 5 V DC 0.0 to 100.0 % 4 01 0 to 20 mA DC 0.0 to 100.0 % 7 01

1 to 5 V DC 0.0 to 100.0 % 6 01 4 to 20 mA DC 0.0 to 100.0 % 8 01

0 to 200 °C K 01 0 to 400 °C K 02 0 to 600 °C K 03 0 to 800 °C K 04 0 to 1000 °C K 05 0 to 1200 °C K 06 0 to 1372 °C K 07 0 to 100 °C K 13 0 to 300 °C K 14 0 to 450 °C K 17 0 to 500 °C K 20 0 to 800 °F K A1 0 to 1600 °F K A2 0 to 2502 °F K A3 20 to 70 °F K A9

0 to 200 °C J 01 0 to 400 °C J 02 0 to 600 °C J 03 0 to 800 °C J 04 0 to 1000 °C J 05 0 to 1200 °C J 06

0 to 450 °C J 10 0 to 800 °F J A1 0 to 1600 °F J A2 0 to 2192 °F J A3 0 to 400 °F J A6 0 to 300 °F J A7

0 to 1600 °C R 01 0 to 1769 °C R 02 0 to 1350 °C R 04

0 to 3200 °F R A1 0 to 3216 °F R A2   

0 to 1600 °C S 01 0 to 1769 °C S 02 0 to 3200 °F S A1

0 to 3216 °F S A2      

400 to 1800 °C B 01 0 to 1820 °C B 02 800 to 3200 °F B A1

0 to 3308 °F B A2      

0 to 800 °C E 01 0 to 1000 °C E 02 0 to 1600 °F E A1

0 to 1832 °F E A2      

0 to 1200 °C N 01 0 to 1300 °C N 02 0 to 2300 °F N A1

0 to 2372 °F N A2      

−199.9 to +400.0 °C T 01 −199.9 to +100.0 °C T 02 −100.0 to +200.0 °CT03

0.0 to 350.0 °C T 04 −199.9 to +752.0 °F T A1 −100.0 to +200.0 °FTA2

−100.0 to +400.0 °F T A3 0.0 to 450.0 °F T A4 0.0 to 752.0 °FTA5

0 to 2000 °C W 01 0 to 2320 °C W 02 0 to 4000 °F W A1 0 to 1300 °C A 01 0 to 1390 °C A 02 0 to 1200 °C A 03

PLII

0 to 2400 °F A A1 0 to 2534 °F A A2   

−199.9 to +600.0 °C U 01 −199.9 to +100.0 °C U 02 0.0 to 400.0 °CU03

−199.9 to +999.9 °FUA1 −100.0 to +200.0 °F U A2 0.0 to 999.9 °FUA3

0 to 400 °C L 01 0 to 800 °C L 02 0 to 800 °F L A1

0 to 1600 °F L A2      

−100.0 to +100.0 °C D 04 −100.0 to +200.0 °C D 05 0.0 to 50.0 °C D 06

0.0 to 100.0 °C D 07 0.0 to 200.0 °C D 08 0.0 to 300.0 °CD09

0.0 to 500.0 °C D 10 −199.9 to +999.9 °F D A1 −199.9 to +400.0 °FDA2

−199.9 to +200.0 °FDA3 −100.0 to +100.0 °F D A4 −100.0 to +30 0.0 °FDA5

0.0 to 100.0 °F D A6 0.0 to 200.0 °F D A7 0.0 to 400.0 °FDA8

0.0 to 500.0 °FDA9      

−199.9 to +649.0 °C P 01 −199.9 to +200.0 °C P 02 −100.0 to +50.0 °CP03

−100.0 to +100.0 °C P 04 −100.0 to +200.0 °C P 05 0.0 to 50.0 °C P 06

JPt100

0.0 to 100.0 °C P 07 0.0 to 200.0 °C P 08 0.0 to 300.0 °CP09

0.0 to 500.0 °C P 10      

The first edition: APR. 2004 [IMQ00]

HEADQUARTERS: 16-6, KUGAHARA 5-CHOME, OHTA-KU TOKYO 146-8515 JAPAN

PHONE: 03-3751-9799 (+81 3 3751 9799) E-mail: info@rkcinst.co.jp

RKC INSTRUMENT INC.

IMNZC21-E1 APR. 2004

PHONE: 03-3751-9799 (+81 3 3751 9799) E-mail: info@rkcinst.co.jp

FAX: 03-3751-8585 (+81 3 3751 8585)

RKC REX-C900 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1. PRODUCT CHECK

2. MOUNTING

2.1 Mounting Cautions

2.2 Dimensions

2.3 Mounting procedures

3. WIRING

3.1 Wiring Cautions

3.2 Terminal Configuration

4. PARTS DESCRIPTION

5. SETTING

5.1 Operation Menu

5.2 Parameter List

5.3 Changing Parameter Settings

6. OPERATION

6.1 Operating Precautions

6.2 Set Data Lock (LCK) Function

6.3 Autotuning (AT) Function

7. INITIAL SETTING

7.1 Go to Initialization Mode

7.2 Exit Initialization Mode

7.3 Initial Setting Menu

7.4 Input Type Selection (SL1)

7.5 Temperature Unit and Cooling Type Selection (SL2)

7.7 PV bias (Pb)

7.8 ON/OFF Action Differential Gap (oH)

8. ERROR DISPLAYS

9. INPUT RANGE TABLE