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K8AC-H

21

Safety Precautions

The following precautions are essential to ensure safety. Always heed 
these precautions.

1.

Do not use or store the Product in the following locations.

 Outdoors or in locations subject to direct sunlight, wind, or rain

 Locations subject to dust, metal powder, or corrosive gases (in 

particular, sulfuric or ammonia gas)

 Locations subject to static electricity or noise

 Locations subject to flooding or exposure to oil

2.

Use DIN Track for installation and mount the Product in the correct 

direction.

3.

Do not touch the terminals when power is being supplied. Electric 

shock may occasionally occur.

4.

Be sure you understand the contents of the Instruction Sheet and 

User’s Manual and handle the Product according to the 

instructions provided.

5.

Check all terminal numbers and polarity when wiring and wire all 

connections correctly.

6.

Tighten terminal screws to the following torque.

 Power supply terminals: 0.5 N·m

7.

Use the Product within the specified temperature and humidity 

ranges.

8.

Do not use the product in locations subject to flammable or 

explosive gases. Explosions may occasionally occur if the product 

is used in such locations.

9.

Do not install the Product in any way that would place a load on it.

10.

Use the Current Transformer specified by OMRON.

11.

Install an external switch or circuit breaker that complies with 

applicable IEC60947-1 and IEC60947-3 requirements and label it 

clearly so that the operator can quickly turn OFF the power.

12.

The product must be handled by personnel who have knowledge 

of electrical systems.

The following precautions are essential to ensure correct use. Always 
heed these precautions.

1.

Do not use the product in the following locations.

 Places subject to radiant heat from heat generating devices.

 Places subject to vibrations or physical shocks.

2.

Make sure to use setting values appropriate for the controlled 

object. Failure to do so can cause unintended operation, and may 

result in accident or corruption of the product.

3.

Do not use thinner or similar solvent for cleaning. Use commercial 

alcohol.

4.

When discarding, properly dispose of the product as industrial 

waste.

5.

To measure correct values, perform aging for approximately 15 

minutes.

6.

Only use this product within a board whose structure allows no 

possibility for fire to escape.

Installation

1.

When wiring, use only recommended crimp terminals.

2.

Do not block areas around the product for proper dissipation of 

heat. (If you do not secure space for heat dissipation, life cycle of 

the product will be compromised.)

Mounting the K8AC-H

Pull down the hook on the bottom of the K8AC-H, and then catch 
the hook on the top of the K8AC-H onto the DIN Track and press 
the K8AC-H onto the DIN Track until it locks into place. 

Removing the K8AC-H

Pull down on the hook with a flat-blade screwdriver and lift up on 
the K8AC-H.

Noise Countermeasures

1.

Do not install the product near devices generating strong high 

frequency waves or surges.

2.

When using a noise filter, check the voltage and current and install 

it as close to the product as possible.

3.

In order to prevent inductive noise, wire the lines connected to the 

product separately from power lines carrying high voltages or 

currents. Do not wire in parallel with or on the same cable as power 

lines.

Other measures for reducing noise include running lines along 

separate ducts and using shield lines.

Wiring

Do not touch terminals or perform wiring while power is supplied to 
the product. Doing so may result in injury or malfunction.

Wire to the correct terminal number. Incorrect wiring may result in 
damage to or burning of components.

Wiring the Push-in Terminals

Directly insert the ferrule in the hole of the terminal to be wired.

Removing Wires from the Push-in Terminals

Insert the recommended flat-blade screwdriver straight into the 
hole to pull out the wire.

Precautions for Safe Use

Precautions for Correct Use

7    8    9   10  11  12  13  14

RUN ADJ SET GA

TE SSR ALM

8

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8

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8

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8

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RUN ADJ SET GA

TE SSR ALM

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7    8    9   10  11  12  13  14

8

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8

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8

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8

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Summary of Contents for K8AC-H Series

Page 1: ...nitor for element burnouts on heaters controlled with power regulators that used a three alarm method Normal monitoring is not possible for circuits that use a power regulator with a six alarm method...

Page 2: ...re linked with the control output value from the temperature controller Compatible with Gradient Settings of Power Controllers When using gradient settings with a power controller set a gate current l...

Page 3: ...tput specifi cations Com munica tions output Current input range 0 200 to 2 200 A 2 00 to 22 00 A 20 0 to 200 0 A 100 to 240 VAC ON OFF control SSR control Two current inputs for either single phase o...

Page 4: ...ut impedance 4 k min Cyclic and phase con trol 4 to 20 mA DC Burnout detection is possible for an input of 7 mA or greater Input impedance 50 max Outputs Relay contact outputs K8AC H C FLK One SPDT re...

Page 5: ...als and output terminals Dielectric strength 2 000 V for 1 min Between terminals and case Between power supply terminals CT primary terminals and gate input terminals communications terminals Between...

Page 6: ...VAC 0 3 A 30 VDC 1 A Maximum contact voltage 125 VAC 60 VDC Maximum contact current 1 A Maximum switching capaci ty 37 5 VA 30 W Minimum applicable load failure rate P value refer ence value 5 VDC 10...

Page 7: ...ct to the operating power supply All models 3 to 4 5 to 6 Outputs Outputs SSR open or short circuit detection results Outputs heater burnout or layer short circuit detection results K8AC H2 N transist...

Page 8: ...CTs for three phase heaters For three phase heaters always set the burnout alarm set values for both CT1 and CT2 5 6 3 4 Transistor Output K8AC H2 N FLK CT2 CT1 3 7 8 9 10 11 12 13 14 1 2 RS 485 X 4 5...

Page 9: ...ransistor Output K8AC H2 N FLK Heater Power supply Power Regulator Temperature Controller 4 to 20 mA current output Operation Description If the heater current detected at either CT1 or CT2 falls belo...

Page 10: ...o after one heater burns out with the current prior to the burnout i e the normal current taken as 1 3 In actual operation there may be effects from factors such as load heater imbalances so conduct a...

Page 11: ...s output accordingly SSR Short Circuit Detection If current is measured when there is no gate input an SSR short circuit error is detected and an alarm is output SSR Open Circuit Detection If current...

Page 12: ...Short Open Circuit Alarm Using the Power Regulator s Gradient Settings The power regulator s gradient settings can be used to prevent malfunction by setting the operation gate current level The relati...

Page 13: ...or over OFF for less than 4 mA SSR SSR error Lights when an SSR error occurs open or short circuit OFF when SSR is normal ALM Alarm Lights for heater burnout or overcurrent OFF at all other times Up k...

Page 14: ...pe P should be selected Type P is also selected for cyclic control Select the appropriate relay or transistor output specifications depending on the application K8AC H Parameter Settings Procedure Onl...

Page 15: ...freshed each time an alarm is output and it is saved in non volatile memory The value is saved when power is interrupted The number of outputs is not counted for the test function After counting to 99...

Page 16: ...r at least 1s Press the L key for at least 1 s Press the S key for at least 1 s Press the L key for at least 1s When the key is released Press the S key for at least 1 s Press the L and M keys Press t...

Page 17: ...layer short circuit detection function SSR open circuit detection function SSR short circuit detection function Output ON delay time Soft startup time Startup lock time Gate input function Alarm hyst...

Page 18: ...99 9 s 0 0 OFF SSR Short Circuit Detection Turns the SSR short circuit detection function ON and OFF ssht ON OFF OFF SSR Open Circuit Detection Turns the SSR open circuit detection function ON and OFF...

Page 19: ...te current level Sets the gate current level for SSR operation This setting is valid only when cyclic or phase control is selected as the heater control method sglv 4 0 to 20 mA 7 0 mA Cycle time 3 Se...

Page 20: ...ntact Approx 3 dia 18 22 Approx 6 dia Plug Contact Lead Plug 100 15 30 30 5 Two M3 Depth 4 max 12 dia 40 40 5 15 Current Transformer K8AC CT200 Pre wired Leads Current Transformer K8AC CT200L 1 8 76 4...

Page 21: ...o can cause unintended operation and may result in accident or corruption of the product 3 Do not use thinner or similar solvent for cleaning Use commercial alcohol 4 When discarding properly dispose...

Page 22: ...larm of the K8AC H P FLK when phase control is used Set the burnout alarm value of the K8AC H P FLK based on the current measurement value with the heater output at 100 This is because the burnout det...

Page 23: ...RODUCTS UNLESS OMRON S ANALYSIS CONFIRMS THAT THE PRODUCTS WERE PROPERLY HANDLED STORED INSTALLED AND MAINTAINED AND NOT SUBJECT TO CONTAMINATION ABUSE MISUSE OR INAPPROPRIATE MODIFICATION OR REPAIR A...

Page 24: ...em as a whole has been designed to address the risks and that the OMRON products are properly rated and installed for the intended use within the overall equipment or system Authorized Distributor In...

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