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K8AC-H

6

Current Measurement Ranges by Model

I/O Ratings

Relay Contact Output

Transistor Output

Communications Specifications

200 A

Model

20 A

2 A

100 A

Current
measure-
ment
ran

g

e

Current
Trans-
former 

Item

K8AC-H

@

1

@@

-FLK

0.200 to 2.200 A AC

K8AC-CT20S: 5.8-mm through-hole diameter 

or

K8AC-CT20L: 12-mm through-hole diameter 

K8AC-H

@

2

@@

-FLK

2.00 to 22.00 A AC

K8AC-H

@

3

@@

-FLK

20.0 to 200.0 A AC

K8AC-CT200: 

12-mm through-hole 

diameter 

or

K8AC-CT200L: 

30-mm through-hole 

diameter

2.200 A

2.00 A

22.00 A

20.0 A

200.0 A

0.200 A

Item

Load

Resistive load (cos

φ

 = 1) 

Rated load

125 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 mA

Mechanical life expectancy

50,000,000 operations min. (at a switching 

frequency of 18,000 times/h)

Electrical life expectancy
(Ambient temperature con-
dition: 20°C)

100,000 operations min. (at rated load and 

switching frequency of 1,800 times/h)

Maximum load voltage

12 to 24 VDC (+10%, 

15%)

Maximum load current

50 mA

OFF leakage current

100 

μ

A max.

ON residual voltage

1.5 V max.

Item

Communications

RS-485

Transmission method

Two-wire, half-duplex

Synchronization method

Start-stop synchronization

Baud rate

1,200, 2,400, 4,800, 9,600, or 19,200 bps

Transmission code

ASCII

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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