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Authorised Distributors:-
Intech Systems Chennai Pvt. Ltd,
Ph: +91 44 4353 8888 Fax: 044 4353 7888
E-mail: info@intechchennai.com Website: www.intechchennai.com
Digital Heater Element Burnout Detector
K8AC-H
A high-precision Heater Element Burnout
Detector compatible with a wide-range of
heater control methods.
• Screw-less clamp terminals to reduce work.
• Scaling * 1
• NPN or PNP equivalent output.
• Lineup includes models compatible with many heater control
methods, including ON/OFF control, phase control, and cyclic control.
• High-precision heater burnout alarm with digital measurement.
• Contributes to preventative maintenance.
• If the gate function is disabled,
undercurrent/overcurrent relay or for motor or lamp loads.
• Undercurrent detection values can be set separately for CT1 and
CT2. * 2
• CE marking and cUL certi ed (K8AC-H2
*1. K8AC-H2 @@@ Series only.
*2. The overvoltage detection value is the same
undercurrent output.
Note: Consult with your OMRON representativ
control or cyclic control un der the following conditions.
• Using multiple heaters with di erent heater capacities
• Using heaters with varying heater resistance (e.g., halogen heaters)
Features
High-precision Heater
High-resolution Digital Measurement
Burnout Alarm Possible for One of Multiple
Heater Elements
Heater burnout is detected by di gitally processi ng minor current
uctuations.
RST
G3PB
Three-phase
SSR
Current Transformer
Electric
oven
Three-phase
delta-connected heater
Chennai-600 032
* 1
* 1
the gate input can be used as an
@@@ Series pending).
for the CT1 and CT2. Also, there is one
e before using the K8AC with phase
Burnout Alarms with
E5 @@
Digital
Temperature
Controller
K8AC-H @
Digital Heater
Element Burnout
Detector
Wide Current Input Range: 0.200 to 200.0 A AC.
Screw-less Clamp Terminals for Reduced
Work
(K8AC-H2 @@@ Series Only)
Screw-clamp terminals with no screws eliminate the need to control
screw torque and retighten screw.
Easily connect terminal s using ferrules with insulation sleeves.
Easy Scaling Using the External CT Ratio
and Number of CT Passes
(K8AC-H2 @@@ Series Only)
Easily set the scaling just by inpu
number of CT passes.
External
CT
@A/1A
(1) CT ratio
K8AC-CT @
Current Transformer
Heater
tting (1) the CT ratio and (2) the
(2) Number of CT passes
1
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Table of Contents
Related Manuals for Omron K8AC-H2
Summary of Contents for Omron K8AC-H2
- Page 1 • Undercurrent detection values can be set separately for CT1 and CT2. * 2 • CE marking and cUL certi ed (K8AC-H2 @@@ Series pending). *1. K8AC-H2 @@@ Series only. *2. The overvoltage detection value is the same for the CT1 and CT2.
- Page 2 Models with heater burnout alarms for ON/OFF control, phase control, and cyclic control have been added to the lineup. The transistor output of the K8AC-H2@@N uses a photocoupler for Check the current input range, connected CT, and relay output type isolation with the internal circuits, and so either an NPN open- before selecting the model from the product specifications.
- Page 3 Transformers K8AC-CT200L (sold separately) Note: Consult with an OMRON representative if multiple heaters with different capacities are to be connected in parallel or if the heater resistance will vary. Production To Be Discontinued at the End of March 2009 Models with Screw Terminals...
-
Page 4: Specifications Ratings
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 step-down transformer. Contact your OMRON representative for information on transformers. - Page 5 K8AC-H Characteristics Heater control method Models for ON/OFF control (e.g., SSRs or contactors) Models for phase control and cycle control Item Model K8AC-H@@@C@-FLK K8AC-H@@P@-FLK 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...
- Page 6 K8AC-H Current Measurement Ranges by Model I/O Ratings Relay Contact Output K8AC-H@1@@-FLK K8AC-H@2@@-FLK K8AC-H@3@@-FLK Item Model Item Load Resistive load (cosφ = 1) Current 0.200 to 2.200 A AC 2.00 to 22.00 A AC 20.0 to 200.0 A AC measure- Rated load 125 VAC, 0.3 A, 30 VDC, 1 A ment...
- Page 7 SSR alarm output overcurrent alarm output Transistor circuit drive circuit The transistor output of the K8AC-H2@@N uses a photocoupler for Heater burnout, heater layer short isolation with the internal circuits, and so either an NPN open- Transistor circuit, overcurrent alarm output collector output or a PNP equivalent output can be used.
-
Page 8: External Connection Example
No burnout alarm is output, however, when the temperature con- Transistor Output troller control output is OFF. K8AC-H2@@N-FLK Burnouts are detected only while the temperature controller control output is being input to the gate input terminals (11 and 12). Faulty outputs do not occur because heater burnout detection is linked with the temperature controller. - Page 9 • CT1 and CT2 are special products. Use K8AC-CT@@. • The CTs do not have polarity. • Connect only one CT for single-phase heaters. * Consult with your OMRON representative if multiple heaters are connected • Connect two CTs for three-phase heaters. Heater * in parallel different heater capacities, or if a heater with varying heater •...
- Page 10 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.
- Page 11 K8AC-H Operation Main K8AC-H Functions The K8AC-H is a 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 Error Detection The following heater control methods can be used. The following errors are detected according to status.
- Page 12 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 Output Operation Time Charts representative before using a heater with varying resistance values.
- Page 13 K8AC-H Nomenclature Nomenclature and Operations K8AC-H2@@@-FLK K8AC-H1@@@-FLK Name Operation Displays processing values, parameter characters, Main display and set values. RUN (Mea- Lights when the power is turned ON and the surement measurement operation is in progress. operation) OFF at all other times.
- Page 14 K8AC-H Settings Method Settings Methods for SSR and ON/OFF Control Heaters Settings Conditions K8AC-H Parameter Setting Procedure Detecting burnouts in just one heater when ten 300-W rated heaters (Only the minimum settings are shown here. Refer to pages 16 to are connected in parallel to a single-phase 200-V power supply.
- Page 15 K8AC-H Measurement Monitor Value Display Ranges and Functions Other than measuring the heater current, the K8AC-H can measure the power supply voltage, maximum/minimum current, maximum/minimum voltage, and other values. The measurement data can be monitored from a host using RS-485 communications. The measurement monitor value names, display ranges, and functions are given in the following table.
-
Page 16: Setting The Parameter
K8AC-H Operating Procedures Moving between Modes To Gate Mode Press the When the D key is pressed for at least one second in Run Mode, the key for at least 1 s. Gate Mode mode will be switched to Gate Mode. To return to Run Mode from Power ON Press the Gate Mode, press the D key for at least one second. -
Page 17: Parameter List
Parameter Display Note: Displayed only for Number of CT passes 2 the K8AC-H2@@@. : Displayed for all models and settings. ctr2 : May not be displayed depending on the model or settings. CT ratio 2 ndp2... - Page 18 K8AC-H Note: Shaded parameters must always be set regardless of the Parameter Defaults and Descriptions measurement method. Item Param- Parameter name Description Setting range Default Mode eter Restricts access to Adjust Mode or Set Mode from Run Mode. 0: Access enabled to both Adjust Mode and Set Mode. aspt Setting Change Protection 0 to 2...
-
Page 19: Recommended Tools
K8AC-H Dimensions (Unit: mm) Digital Heater Element Burnout Detectors K8AC-H2@@@-FLK 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. K8AC-H1@@@-FLK Recommended Tools... -
Page 20: Optional Parts (Sold Separately)
K8AC-H Optional Parts (Sold Separately) Current Transformer 1.2 dia. K8AC-CT20S 5.8 dia. 10.5 Two, 3.5 dia. Current Transformer Accessories with K8AC-CT20L: Connection Example 2.36 dia. K8AC-CT20L Contact Contact Plug Approx. 3 dia. Lead 12 dia. Plug Two, M3 Depth: 4 max. Approx. -
Page 21: Safety Precautions
9. Do not install the Product in any way that would place a load on it. Noise Countermeasures 10.Use the Current Transformer specified by OMRON. 1. Do not install the product near devices generating strong high 11.Install an external switch or circuit breaker that complies with frequency waves or surges. - Page 22 K8AC-H Q & A Why does the current measured by the K8AC-H decrease during cyclic or phase control? To enable measuring the current accurately for the heater control value, the K8AC-H @@ P @-FLK uses the current input waveform from a gate input and the Current Transformer to compensate the measured current value and burnout alarm value.
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