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K8AB-PW1 Datasheet(PDF) 9 Page - Omron Electronics LLC |
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K8AB-PW1 Datasheet(HTML) 9 Page - Omron Electronics LLC |
9 / 10 page K8AB-PW 9 Checking Operation Overvoltage Gradually increase the input from 80% of the setting. The input value will equal the operating value when the input exceeds the setting and the alarm indicator starts flashing. Operation can be checked by the relay output that will start after the operating time has passed. Undervoltage Gradually decrease the input from 120% of the setting and check the operation using the same method as for overvoltage. Example: For monitoring mode set to three-phase three-wire monitoring, a rated voltage of 200 V, and an operating time of 5 s. Note: K8AB-PW @ output relays are normally operative. Connection Diagram How to Measure the Operating Time Overvoltage Change the input suddenly from 0% to 120% of the set value and measure the time until the Unit operates. Undervoltage Change the input suddenly from 120% to 0% of the set value and measure the time until the Unit operates. Operating Time Adjust the slide resistor so that the voltage applied to the K8AB terminals is 120% of the overvoltage set value or 80% of the undervoltage set value when the auxiliary relay operates in a test circuit. Close the switch and use the cycle counter to measure the operating time. Connection Diagram Operating Adjustment Knobs Use a screwdriver to turn the knobs. There is a stopper to prevent the knob from turning any further once it has been turned completely to the left or right. Do not force the knob past these limits. Overvoltage Detection When Only One Phase Exceeds the Overvoltage Threshold The K8AB monitors each of the three-phase voltages. This means an overvoltage is detected if even only one phase exceeds the threshold value. The same applies to undervoltages. Questions and Answers Q Set value Input voltage Alarm indicator Relay output Flashing Lit 5 s 0 to 150 V V1 Three-phase variable autotransformer L1 L2 L3 3 φ, 200 VAC V2 V3 L1 L2 L3 Overvoltage Undervoltage Q L1 L2 L3 ± C 200 V Cycle counter V1 V2 V3 X X/a X/b L1 L2 L3 R1 R2 R1: Slide resistor 200 Ω 200 W R2: 100 Ω 400 W 3 φ, 200 VAC Q Q In the interest of product improvement, specifications are subject to change without notice. ALL DIMENSIONS SHOWN ARE IN MILLIMETERS. To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527. |
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