omRon Thermistor Motor Protection RelayK8AK-TS/-PT C€ Monitor Temperature Rise through Internal Motor Loss • Temperature, phase sequence, and phase loss monitoring with the Din 22.5-mm-sized K8AK-PT Relays. • Side-by-side mounting of K8AK-PT Relays. •Specially designed for internal motor monitoring; no setting required. •Test/Reset Button for confirmation of output operation. • Monitoring also performed for thermistor disconnections and short circuits. • Manual or automatic resetting with the same Relay. A Refer to Safety Precautions on page 8. Refer to page 7 for commonly asked questions. For the most recent information on models that have been certified for safety standards, refer to your OMRON website. Ordering Information List of Models

Connections Terminal Diagram K8AK-PT1 100-240VAC A Control Output Relay output 250 VAC, 5 A (resistive load) 30 VDC, 5 A (resistive load) Input Range Y1-T2 open Automatic output reset Output Method Y1-T2 closed Manual output reset Relay Output Common B Power Supply Voltage Note: 1. Terminal application depends on the model. 2. Do not connect anything to terminals that are shaded in gray. 3. The T1, T2, and Y1 terminals are not isolated from the three-phase voltage input (L1, L2, and L3), which carries a hazardous voltage (480 V max.). Use cables with reinforced insulation for wiring and connect...

For ferrules with an insulation sleeve. 7 to 8 mm max. •Keys Item Note: 1. Use either a solid wire of 2.5 mm2 maximum or a ferrule with insulating sleeve for the terminal connection. The length of the exposed current-carrying part inserted into the terminal must be 8 mm or less to maintain dielectric strength after connection. For 2.5 mm2 or smaller solid wires -1 7 to 8 mm max Recommended ferrules Phoenix Contact • Al 1,5-8BK (for AWG16) • Al 1-8RD (for AWG18) • Al 0,75-8GY (for AWG18) 2. Tightening torque: 0.49 to 0.59 N-m Setting the Output Reset Method Use the Y1 and T2 terminals to set the...

K8AK-TS/-PT Timing Charts ●Automatic Output Reset (Y1-T2: Open) ●Manual Output Reset (Y1-T2: Closed) Power supply voltage Power supply voltage Three-phase Normal input error Three-phase Normal input error 3,100 Ω TS_ALM t1: Power ON lock (0.6 s) ●Test Mode ●Using Y1-T2 as Remote Reset Terminals Power supply voltage Power supply voltage Three-phase input error Three-phase Normal input error 3,100 Ω Open (Automatic output reset) Y1-T2 status* Open (Automatic output reset) Y1-T2 status.* Closed (Manual output reset) Closed (Manual output reset) Relay contacts (11-14) PH_ALM PH_ALM TS_ALM * When...

K8AK-TS/-PT Questions and Answers Checking Operation PTC Thermistor Input Operation Operating Value The input resistance gradually increases from around 1 kΩ. The operating value is the input value for which the alarm indicator (TS_ALM) lights. The contact outputs switch simultaneously so that you can confirm operation. Note: Refer to the timing charts for the operating methods for reference. Can phase loss be detected on the load side? In principle, phase loss cannot be detected on the load side because the K8AK-PT1 measures three-phase voltage to determine phase loss. Is it possible to detect...

Warning Indications K8AK-TS/-PT Safety Precautions Be sure to read the precautions for all models in the website at the following URL: http://www.ia.omron.com/. Electrical shock may occasionally cause serious injury. Confirm that the input voltage is OFF before starting any wiring work and wire all connections correctly. Electrical shock may cause minor injury. Do not touch terminals while electricity is being supplied. There is a risk of minor electrical shock, fire, or device failure. Do not allow any pieces of metal, conductors, or cutting chips that occur during the installation process to...

Precautions for Safe Use 1. Do not use or store the product in the following locations. • Locations subject to water or oil • Outdoor locations or under direct sunlight • Locations subject to dust or corrosive gases (particularly sulfurizing gases, ammonia, etc.) • Locations subject to rapid temperature changes • Locations prone to icing and dew condensation • Locations subject to excessive vibration or shock • Locations subject to wind and rain • Locations subject to static electricity and noise • Habitats of insects or small animals 2. Use and store the product in a location where the ambient...

Terms and Conditions Agreement Read and understand this catalog. Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you have any questions or comments. Warranties. (a) Exclusive Warranty. Omron’s exclusive warranty is that the Products will be free from defects in materials and workmanship for a period of twelve months from the date of sale by Omron (or such other period expressed in writing by Omron). Omron disclaims all other warranties, express or implied. (b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR...

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