K8AC-CT20S Omron, K8AC-CT20S Datasheet
K8AC-CT20S
Specifications of K8AC-CT20S
K8AC-CT20S Summary of contents
Page 1
... The overvoltage detection value is the same for the CT1 and CT2. Also, there is one undercurrent output. Note: Consult with your OMRON representative before using the K8AC with phase control or cyclic control under the following conditions. • Using multiple heaters with different heater capacities • ...
Page 2
... Analog control is performed on the output power according to the temperature controller's current output ( mA) when phase control or cyclic control is used. • Heater burnout alarms are stable with the K8AC-H because the heater burnout alarm values are linked with the control output value from the temperature controller. ...
Page 3
... Communications Specifications FLK: RS-485 7. Power Supply Voltage 100-240VAC: 100 to 240 VAC Com- munica- tions 0.200 to 2.200 A output K8AC-H21CC-FLK K8AC-H21CN-FLK RS-485 K8AC-H21PC-FLK K8AC-H21PN-FLK K8AC-CT20S or K8AC-CT20L Com- munica- tions 0.200 to 2.200 A output K8AC-H11CC-FLK K8AC-H11CT-FLK RS-485 K8AC-H11PC-FLK K8AC-H11PT-FLK K8AC-CT20S or K8AC-CT20L Installation method Model Surface-mounted with screws ...
Page 4
... K8AC. The gate function can also be disabled 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 step-down transformer. Contact your OMRON representative for information on transformers. ...
Page 5
... Heater control method Models for ON/OFF control (e.g., SSRs or contactors) Item Model K8AC-H@1@@: 0.200 to 2.200 A (Current Transformer: K8AC-CT20S (5.8 dia.), K8AC-CT20L (12 dia.) *1) Heater current K8AC-H@2@@: 2.00 to 22.00 A (Current Transformer: K8AC-CT20S (5.8 dia.), K8AC-CT20L (12 dia.) *1) Input range input K8AC-H@3@@: 20.0 to 200.0 A (Current Transformer: K8AC-CT200 (12 dia.), K8AC-CT200L (30 dia.) *1) ( 30°C) category II ± ...
Page 6
... Current 0.200 to 2.200 A AC 2.00 to 22. measure- ment range 200 A 100 A 22. 2.200 2.00 A 0.200 A K8AC-CT20S: 5.8-mm through-hole diameter Current or Trans- former K8AC-CT20L: 12-mm through-hole diameter 6 I/O Ratings Relay Contact Output K8AC-H@3@@-FLK Item 20.0 to 200 Rated load Maximum contact voltage Maximum contact current 200 ...
Page 7
... Transistor heater layer short circuit, drive overcurrent alarm output circuit 5 The transistor output of the K8AC-H2@@N uses a photocoupler for isolation with the internal circuits, and so either an NPN open- collector output or a PNP equivalent output can be used. NPN Output PNP Equivalent Output Load ...
Page 8
... SSR. • Use temperature controllers with 24-VDC voltage output (30 VDC max.). • CT1 and CT2 are special products. Use the K8AC-CT@@. • The CTs do not have polarity. • Connect only one CT for single-phase heaters. Connect two CTs for three-phase heaters. ...
Page 9
... Wiring Method When Using the K8AC-H with Cyclic Control Heaters Power supply G32A-EA SSR SSR Cyclic current output Control Unit CT1 CT2 * Consult with your OMRON representative if multiple heaters are connected Heater * in parallel different heater capacities heater with varying heater resistance is used. ...
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 5 A Single-phase 200 V 200 V Delta 200 V connection 200 × ...
Page 11
... Operation Main K8AC-H Functions The K8AC digital heater burnout detector that detects heater burnout by measuring the heater current from various power supply systems. The K8AC-H provides the following functions. Applicable Heater Control Methods The following heater control methods can be used. ON/OFF Control (Contactor/SSR) ...
Page 12
... K8AC-H Voltage Fluctuation Compensation The voltage fluctuation compensation function automatically adjusts the burnout alarm value of the K8AC-H according to 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. Thus, a false burnout alarm output will occur if there is a voltage drop in the heater circuit ...
Page 13
... The decimal point position depends on the input type. output ON). K8AC-H@1@@: 0.100 to 2.300 SSR short circuit K8AC-H@2@@: 1.00 to 23.00 detected (when K8AC-H@3@@: 10.0 to 230.0 heater current is *2. If the display is below 0100, the bar display “----” will be shown. detected with temperature control gate output OFF) ...
Page 14
... Setting Method • Wire the K8AC-H, temperature controller ( current output type), and power regulator (phase control). • Press the L Key on the K8AC-H for at least change from Run Mode to Adjust Mode. • AL-1 (CT1 burnout alarm set value) will be displayed when the mode is changed to Adjust Mode ...
Page 15
... Heater 2 input shift display −999 to 999 isc2 current * Each measurement value can be individually reset. Refer to the K8AC-H Digital Heater Element Burnout Detector User’s Manual (Cat. No. N132) for operating procedures. Modes Groups of setting items are called “modes.” The K8AC-H has five modes. ...
Page 16
... K8AC-H Operating Procedures Moving between Modes Press the key for at least 1 s. Power ON Press the L M and keys Run Mode When the key is released Press the L M and keys for 5 s. Protection Settings Mode Press the Press the and key for at least 1s ...
Page 17
... May not be displayed depending on the model or settings. *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, Adjust Mode, Set Mode, or for a measurement parameter, the status will return automatically to the processing value display. ...
Page 18
... SSR Short Circuit Detection SSR Open Circuit Detection Heater Layer Short Circuit Detection (Overcurrent Detection) Heater Layer Short K8AC-H@1 Sets the operating level for heater layer short circuit (overcurrent) Circuit Alarm Level K8AC-H@2 (Overcurrent Alarm K8AC-H@3 Set Value) Heater Control Method *1 ...
Page 19
... M2 bar terminals: Al 0.5-8WH (Phoenix Contact) M2 bar terminals: Al 0.75-8GY (Phoenix Contact) Note: Securely tighten the terminal screws to the following torque: Power supply terminals: 0.5 N·m I/O terminals: K8AC-H (Unit: mm) To remove a wire, insert the recom- mended flat-blade screwdriver straight into the hole under the screw- less clamp terminal of the wire, and simply release the wire ...
Page 20
... K8AC-H Optional Parts (Sold Separately) Current Transformer K8AC-CT20S Current Transformer K8AC-CT20L 12 dia. 5 Current Transformer K8AC-CT200 (Pre-wired Leads) Current Transformer K8AC-CT200L 20 15 2.8 1.2 dia. 0.5 5.5 5.8 dia. 10.5 21 2.5 Two, 3.5 dia Accessories with K8AC-CT20L: Connection Example 2.36 dia. 30 Contact 9 Approx ...
Page 21
... 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. ...
Page 22
... The compensated current value is displayed appears as if the measured current is lower during cyclic or phase control, but the K8AC-H@@P@-FLK is operating correctly. How do I set the burnout detection alarm of the K8AC- Q 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% ...
Page 23
... OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT LIABILITY event shall the responsibility of OMRON for any act exceed the individual price of the product on which liability is asserted EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS REGARDING THE ...
Page 24
... OMRON products are properly rated and installed for the intended use within the overall equipment or system. ...