Omron K8AC-H Manual
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Omron K8AC-H Manual

Digital heater element burnout detector
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Digital Heater Element Burnout Detector
K8AC-H
A high-precision Heater Element Burnout
Detector compatible with a wide-range of
heater control methods.
• Compatible with contactor, SSR, cyclic control, and phase
control methods.
• Compatible with a wide range of heater capacities, from 0.200 to
200.0 A AC (range covered by 3 models)
• Voltage fluctuation compensation function enables accurate
heater burnout detection, because power supply voltage
fluctuations resulting in heater current fluctuation will not cause
faulty outputs.
• Detects burnouts for even one heater when using multiple
heaters.
• If the gate function is disabled, the gate input can be used as an
undercurrent/overcurrent relay or for motor or lamp loads (2
circuits).
• CE Marking.
• Contributes to preventative maintenance for heater burnout.
Note: Consult with your OMRON representative before using phase and
cyclic control under the following conditions.
• Using multiple heaters with different heater capacities
• Using heaters with varying heater resistance (e.g., halogen
heaters)
Features
Compatible with Many Heater Control
Methods
The K8AC-H detects burnouts for cyclic and phase control heaters,
which could not be detected by the K2CU.
One Digital Heater Element Burnout Detector can handle single-
phase or three-phase heaters.
Type
ON/OFF control
(connector/SSR)
Item
K8AC-H@@C@-FLK
Single-phase heater
Three-phase heater
Applicable to Wide Current Range
Current can be measured between 0.200 and 200.0 A using an
external current transformer.
Model
K8AC-H11@
Item
Current
0.200 to 2.200 A
measurement range
AC
Appropriate Current
K8AC-CT20S
Transformer model
K8AC-CT20L
Cyclic
Phase
control
control
K8AC-H@@P@-FLK
K8AC-H12@
K8AC-H13@
2.00 to 22.00 A
20.0 to 200.0 A
AC
AC
K8AC-CT20S
K8AC-CT200
K8AC-CT200L
K8AC-CT20L
Monitors Heater Current
The heater current can be checked on the main display. Error status,
such as that for heater burnout alarms, can also be displayed on the
character display.
Measurement values
· Heater current
· Power supply voltage
Error display
· Heater burnout detection
· Overcurrent detection
· SSR short circuit detection
· SSR open circuit detection
Voltage Fluctuation Compensation
Function
The voltage fluctuation compensation function enables accurate
heater burnout detection, because power supply voltage fluctuations
resulting in heater current fluctuation will not cause faulty outputs.
This function is required when detecting minor current fluctuations.
High-precision Heater Burnout
Detection
Digital settings enable high-precision heater burnout detection.
High-precision threshold value setting is possible using current
measurement value display.
CSM_K8AC-H_DS_E_5_1
Main display
1

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Summary of Contents for Omron K8AC-H

  • Page 1 The heater current can be checked on the main display. Error status, such as that for heater burnout alarms, can also be displayed on the The K8AC-H detects burnouts for cyclic and phase control heaters, character display. which could not be detected by the K2CU.

  • Page 2: Model Number Structure

    ■ Model Number Legend K8AC-H1 @@@ -FLK 100-240VAC 2 3 4 5 1. Basic Model 4. Heater Control Type K8AC-H: Digital Heater Element Burnout Detector C: ON/OFF control (SSR or contactor) 2. Product Type P: Phase control or cyclic control 1: Series number 5.

  • Page 3: Ordering Information

    K8AC-H12PT-FLK 20.0 to 200.0 A K8AC-H13PT-FLK Note: Consult with your OMRON representative if multiple heaters are connected in parallel with different heater capacities, or if a heater with varying heater resistance is used. ■ Optional Products (Sold Separately) Current Transformers...

  • Page 4: Specifications

    K8AC-H. The gate function can also be disabled. If it is disabled, the gate input can be used as a normal undercurrent/overcurrent relay. 2. When using the K8AC-H for a 380 to 480-V AC power supply circuit, Use a 2:1 step-down transformer that can supply at least 10 VA to the load.
  • Page 5 K8AC-H@@@C@-FLK K8AC-H@@P@-FLK Heater Input range K8AC-H@1@@: 0.200 to 2.200 A (Current Transformer: K8AC-CT20S (5.8 dia.), K8AC-CT20L (12 dia.) current input (See note 1.)) (at 10 to 30°C) K8AC-H@2@@: 2.00 to 22.00 A (Current Transformer: K8AC-CT20S (5.8 dia.), K8AC-CT20L (12 dia.) category II (See note 1.))

  • Page 6: Transistor Output

    K8AC-H ■ I/O Ratings Relay Contact Output Item Load Resistive load (cosφ = 1) Rated load 125 VAC, 0.3 A, 30 VDC, 1 A Maximum contact 125 VAC, 60 VDC voltage Maximum contact current Maximum switching 37.5 VA, 30 W...

  • Page 7: Open Collector Outputs

    K8AC-H Connections ■ Terminal Arrangement Gate input Terminals Name Description Applicable Current inputs Communications H8AC-H1@C@ H8AC-H1@P@ models Voltage pulses Linear current 1 to 2 Operating Connect to the operating All models 0 to 12 VDC or RS-485 DC 4 to 20 mA...
  • Page 8 K8AC-H ■ External Connection Example Wiring Method When Using the K8AC-H with SSR Control Heaters Operation Description Power supply • If the heater current detected at either CT1 or CT2 falls RS-485 communications below the burnout alarm set value, an alarm is output. The burnout alarm set value can be set separately for CT1 and CT2.
  • Page 9 • Adjust the burnout alarm set value at a 100% output for gradient settings as well. • If using the soft startup function with a power regulator, set the soft startup function on the K8AC-H as well, to prevent malfunctions. Note: Consult with your OMRON representative if multiple heaters •...
  • Page 10 K8AC-H ■ Heater Connection Methods and Current Depending on the heater connection method, the current when an error occurs will be as shown in the following table. Refer to this table when determining burnout alarm set values. Normal condition Abnormal condition...

  • Page 11: Operation

    3. In actual operation there may be effects from factors such as load (heater) imbalances, so conduct an actual test for confirmation before making adjustments if the current change ratio between normal and abnormal operation is slight. 4. Consult with your OMRON representative if multiple heaters are used with different heater capacities. Operation ■...
  • Page 12 Relay output models: SSR indicator lit, OR of all detection status output Voltage Fluctuation Compensation The voltage fluctuation compensation function automatically adjusts the burnout alarm operation level of the K8AC-H depending on voltage fluctuations in the heater circuit. The operating value for burnout detection when multiple heaters are connected is set very close to the normal value.

  • Page 13: Setting Example

    As a result, high-precision detection of heater burnout is not possible. The effect on the heater and setting methods depends on the heater being used. Therefore, consult with your OMRON representative before using a heater with varying resistance values.

  • Page 14: Alarm Indicators

    SSR short circuit SSR short circuit indicator lit detected (when Note: 1. The decimal point position depends on the input type. heater current is K8AC-H@1@@: 0.100 to 2.300 detected with K8AC-H@2@@: 1.00 to 23.00 temperature control gate output K8AC-H@3@@: 10.0 to 230.0 OFF).
  • Page 15 200-V power supply. for information on how to set parameters.) The heater is SSR controlled. 1. Turn ON the power to the K8AC-H. The initial status when power is turned ON is called RUN mode. Normal Heater Current and Heater Current 2.
  • Page 16 This is the shift value for displaying the CT2 heater current measurement set in current measurement parameter CT2. • The value is saved when power is interrupted. Note: Each measurement monitor value can be individually reset. Refer to the K8AC-H Digital Heater Element Burnout Detector User’s Manual (Cat. No. N132) for operating procedures.
  • Page 17 K8AC-H ■ Modes Groups of setting items are called “modes.” The K8AC-H has five modes. Mode Function Alarm operation This is the normal operating mode, used for receiving inputs, executing heater burnout outputs, etc. Executed Operation goes into RUN mode immediately after power is turned ON.

  • Page 18: Operating Procedures

    K8AC-H Operating Procedures ■ Moving between Modes To GATE Mode When the D key is pressed for at least one second in RUN mode, the mode will be switched to GATE mode. To return to RUN mode Press the key for at least 1 s.
  • Page 19 Note: 1. Displayed when the Selectable Protection Level parameter is set to 0. 2. Displayed by the K8AC-H@@P@-FLK. 3. If more than five minutes elapses with no operations performed in Protection Settings mode, ADJ mode, SET mode, or for a measurement parameter, the status will return automatically to the processing value display.
  • Page 20 K8AC-H ■ Parameter Defaults and Descriptions Note: Shaded parameters must always be set regardless of the measurement method. Item Parameter name Description Parameter Setting range Default Mode aspt Protection Selectable Protection Level Restrict access to Adjust Mode (ADJ) and or...

  • Page 21: Current Transformer

    (See note 1.) detection, or output. (This setting is only valid when phase control is selected as the heater control method.) Note: 1. Displayed by the K8AC-H@@P@-FLK. 2. Displayed by the K8AC-H@@C@-FLK. Dimensions Note: All units are in millimeters unless otherwise indicated.
  • Page 22 K8AC-H Current Transformer K8AC-CT20L 2.36 dia. Accessories with K8AC-CT20L: Connection Example • Contact Contact Plug Approx. 3 dia. Lead 12 dia. • Plug Two, M3 Depth: 4 min Approx. 6 dia. (22) Current Transformer K8AC-CT200 (Pre-wired Leads) 12 dia. Two, M3 Depth: 4 max.

  • Page 23: Safety Precautions

    Product is used in such locations. 9. Do not install the Product in any way that would place a load on it. 10.Use only the CTs specified by OMRON. 11.Be sure to install the Product in a panel designed so that fire cannot escape to the exterior of the panel.
  • Page 24 OMRON products are properly rated and installed for the intended use within the overall equipment or system.
  • Page 25 Warranty and Limitations of Liability WARRANTY OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a period of one year (or other period if specified) from date of sale by OMRON. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR PARTICULAR PURPOSE OF THE PRODUCTS.
  • Page 26 General Purpose Relays Click to view products by manufacturer: Omron Other Similar products are found below : APF30318 JVN1AF-4.5V-F PCN-105D3MHZ 5JO-10000S-SIL 5JO-1000CD-SIL 5JO-400CD-SIL LY2S-AC220/240 LYQ20DC12 6031007G 6131406HQ 6-1393099-3 6-1393099-8 6-1393122-4 6-1393123-2 6-1393767-1 6-1393843-7 6-1415012-1 6-1419102-2 6- 1423698-4 6-1608051-6 6-1608067-0 6-1616170-6 6-1616248-2 6-1616282-3 6-1616348-2 6-1616350-1 6-1616350-8 6-1616358-7 6-...

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