Global
These are navigation links to move inside this page.
SitemapDigital Heater Element Burnout Detector
K8AC-H
A high-precision Heater Element Burnout Detector compatible with a wide-range of heater control methods.
Data Sheet (1645KB)
Quick links to 'K8AC-H' page in your country / territory.
-
- Middle East
-
Please contact our European headquarters.
Get more support via Products links, such as manuals and CAD files.
Ratings
| Power supply voltage | 100 to 240 VAC (50/60 Hz) *2 | |||
| Operating voltage range | 85% to 110% min. of the rated power supply voltage (85 to 264 V) | |||
| Power consumption (at max. load) | 35 VA max. (at max. load) | |||
| Applicable circuits | Single-phase or three-phase (with same model) | |||
| Applicable control methods | Contactor ON/OFF control (e.g., temperature controller with relay output) SSR control (e.g., temperature controller with voltage output) Cyclic control and phase control (e.g., temperature controller with current output) | |||
| Current measurement | Current measurement via two special CTs (Burnout alarm set value can be set separately for each CT.) | |||
| Special CT models *3 | Current input range | Applicable models | ||
| K8AC-CT20S | 0.200 to 2.200 A 2.00 to 22.00 A | K8AC-H[]1[][], K8AC-H[]2[][] | ||
| K8AC-CT20L | ||||
| K8AC-CT200 | 20.0 to 200.0 A | K8AC-H[]3[][] | ||
| K8AC-CT200L | 20.0 to 200.0 A | K8AC-H[]3[][] | ||
| Measurement method | Instantaneous measurement using root-mean-square values | |||
| Gate input signal *1 | Contactor ON/ OFF control | Voltage = 12/24 VDC (continuous input possible to 30 VDC) Input impedance = 4 kΩ min. | ||
| SSR control | ON voltage: 9.6 VDC max., OFF voltage: 1 VDC min. Minimum voltage pulse ON time for burnout detection: 200 ms min. | |||
| Cyclic and phase control | 4 to 20 mA DC (Burnout detection is possible for an input of 7 mA or greater.) Input impedance = 50 Ω max. | |||
| Output | Relay contact output: K8AC- H[][][]C-FLK | One SPDT relay contact output Same output used for heater burnout alarms, overcurrent alarms, SSR short circuit alarms, and SSR open circuit alarms. 0.3 A at 125 VAC (resistive load), 1 A at 30 VDC (resistive load) Maximum switching capacity: 37.5 VA, 30 W Mechanical durability: 50 million operations min., electrical durability: 100,000 operations min. | ||
| Transistor output: K8AC- H[][][]T-FLK | Two NPN open-collector outputs One ALM output: Outputs heater burnout alarms and overcurrent alarms One SSR error output: Outputs SSR short circuit and open circuit alarms. 12 to 24 VDC, 50 mA max. OFF leakage current: 100 μA max., ON residual voltage: 1.5 V max. | |||
| Communications | RS-485 1200, 2400, 4800, 9600, 19200 bps (CompoWay/F) | |||
| Indication method | 7-segment digital display: No. of display digits: 4 (red) LED status indicators: RUN (green), ADJ (orange), SET (orange), GATE (orange), SSR (orange) and ALM (orange) | |||
| Main functions | Heater burnout alarms, overcurrent alarms, SSR short circuit alarms, SSR open circuit alarms, voltage fluctuation compensation, output ON delay timer, energy-saving mode, key protection, and power supply voltage measurement | |||
| Ambient operating temperature | - 10 to +55 ° C (with no icing or condensation) | |||
| Ambient operating humidity | 25% to 85% (with no condensation) | |||
| Storage temperature | - 25 to +65 ° C (with no icing or condensation) | |||
| Altitude | 2,000 m max. | |||
| Dimensions | 35 × 90 × 100 mm (W x L x H) | |||
| Case material | PC (Polycarbonate) | |||
| Case color | Munsell N1.5 | |||
| Mounting method | Mounting to a DIN Track | |||
*1.The gate input enables correct measurement by syncing to heater control. When using it with contactor ON/OFF control, receive the relay contact output from the temperature controller or other controller with an auxiliary relay and then use this signal as the gate input signal to the 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.
*3.Order the CTs separately.
Characteristics
| Model | Models for contactor control and SSR control K8AC-H[][][]C[]-FLK | Models for phase control and cycle control K8AC-H[][]P[]-FLK | |
| Heater current input (at 10 to 30°C) category II | Input range | K8AC-H []1[][]: 0.200 to 2.200 A (Current Transformer: K8AC-CT20S (5.8 dia.), K8AC-CT20L (12 dia.) *1) K8AC-H[]2[][]: 2.00 to 22.00 A (Current Transformer: K8AC-CT20S (5.8 dia.), K8AC-CT20L (12 dia.) *1) K8AC-H[]3[][]: 20.0 to 200.0 A (Current Transformer: K8AC-CT200 (12 dia.), K8AC-CT200L (30 dia.) *1) | |
| Measurement accuracy | ± 3% rdg ± 10 digits max. *2 | ± 6% rdg ± 10 digits max. *2 | |
| Voltage fluctuation compensation category II | Input range | 85 to 264 VAC | |
| Measurement accuracy | ± 3% rdg ± 10 digits max. | ||
| Gate input | Input range | 0 to12 VDC or 0 to 24 VDC ON: 9.6 VDC max., OFF: 1 VDC min. | 4 to 20 mA DC |
| Display cycle | Selectable: Immediate, 0.2 s, 0.5 s, 1.0 s | ||
| Output ON-delay time | 0.0 to 99.9 s (operating time) | ||
| Soft start time | 0.0 to 99.9 s (Used when using the soft start function of a Power Controller) | ||
| Output reset method | Automatic reset | ||
| Output hysteresis | 1 to 999 digits | ||
| Output response time | 500 ms max. | 3.5 s max. | |
| Insulation resistance | 20 M Ω min. (at 500 VDC) between external terminals and case | ||
| Dielectric strength | 2,000 V for 1 min between the external terminals and the case | ||
| Noise immunity | Power supply terminals normal/common mode: ±1,500 V (startup 1-ns square-wave noise, pulse width: 1 μs/100 ns) | ||
| Vibration resistance | Vibration: 10 to 55 Hz, Acceleration: 50 m/s2 for 5 min with 10 sweeps each in X, Y, and Z directions | ||
| Shock resistance | 150 m/s2 (100 m/s2 for relay contacts) 3 times in 6 directions in X, Y, and Z directions | ||
| Maximum allowable input | Current Transformer primary-side current | K8AC-H[]1[][]: 4 A: 30 s, 12 A: 1 s K8AC-H[]2[][]: 40 A: 30 s, 120 A: 1 s K8AC-H[]3[][]: 400 A: 30 s, 1200 A: 1 s | |
| Gate input: 4 to 20 m | 40 mA DC continuous | ||
| Voltage pulse gate input | 30 VDC continuous | ||
| Input impedance | Gate input: 4 to 20 m | 50 Ω max. | |
| Voltage pulse gate input | 4 k Ω max. | ||
| Weight | Approx. 200 g | ||
| Memory protection | Non-volatile memory (number of writes: 100,000 operations) | ||
| Installation environment | Installation Category 2, Pollution Class 2 | ||
| Approved standards | EN 61010-1 (IEC 61010-1) ( TÜV evaluation) | ||
| EMC | EMI: EN61326 Industrial applications Radiated Interference Electromagnetic Field Strength: EN55011 Group 1, class A Noise Terminal Voltage: EN55011 Group 1, class A EMS: EN61326 Industrial applications ESD Immunity: EN61000-4-2: 4 kV (contact discharge), 8 kV (air discharge) Electromagnetic Immunity: EN61000-4-3: 10 V/m 1 kHz sine wave amplitude modulation (80 MHz to 1 GHz) Fast Transient Burst Immunity: EN61000-4-4: 2 kV (power line), 1 kV (I/O signal line) Surge immunity: EN61000-4-5: 1 kV (line to line, power line), 2 kV (line to ground, power line) Conducted Noise Immunity EN61000-4-6: 3 V (0.15 to 80 MHz) Voltage Dip/Interrupting Immunity EN61000-4-11: 0.5 cycle, 0.180°, 100% (rated voltage) | ||
*1.Current Transformers are sold separately.
*2.The values for measurement current apply to combined use with a specialized Current Transformer.
I/O Ratings
Relay Contact Output
| Load | Resistive load (cosΦ = 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 capacity | 37.5 VA, 30 W |
| Minimum applicable load (failure rate P value, reference value) | 5 VDC, 10 mV |
| Mechanical life expectancy | 50,000,000 operations min. (at a switching frequency of 18,000 times/h) |
| Electrical life expectancy (Ambient temperature condition: 20°C) | 100,000 operations min. (at rated load and switching frequency of 1,800 times/h) |
Transistor Output
| Maximum load voltage | 12 to 24 VDC (+10%, - 15%) |
| Maximum load current | 50 mA |
| OFF leakage current | 100 μA max. |
| ON residual voltage | 1.5 V max. |
Communications Specifications
| 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 |
Caution: In the interenst of product improvement, specifications are subject to change without notice.
Top of page
© Copyright OMRON Corporation 2007 - 2009. All Rights Reserved.
