Frequency Sensitive Relays WILMAR™ Protective Relays – WOF & WUF Series Function: 81 O/U • ANSI/IEEE C37.90-1978 • UL file No. E58048 • CSA file No. LR61158 Application: The output contacts of frequency relays are energized when the frequency exceeds the adjustable set point. Overfrequency and underfrequency relays are available in 50, 60 and 400Hz. Combination over/ underfrequency “band pass” relays are also available. These are energized at rated frequency and deenergized during overfrequency or underfrequency conditions. Frequency Differential relays are energized above the preset frequency. The pick-up and drop-out frequency settings are independently adjustable. 2 1/ 2 5 /8 3 1 /8 4 2 1/ 4 3 / 1 4 4 / 1 2 Time Delay / DIA. 4 HOLES 11 64" Standard Time Delay A minimum, fixed inverse time delay is incorporated in PART NUMBER SELECTION all frequency relays to prevent nuisance tripping and is represented by the typical curves shown below. Note: Dimensions in inches. Multiply values by 25.4 for dimensions in mm. Typical Curves (WOF Series) Typical Curves (WUF Series) 90 60 Overfrequency Relay Model WOF-12-6070 85 58 Hz. Setting 55 Adjustable Time Delay If additional time delay is required, a suffix "T" must be added to the part number. This allows the minimum fixed time delay to be field-adjustable up to 20 seconds 55 Hz. Setting 80 50 75 45 70 Hz. Setting 40 70 65 Hz. Setting 62 Hz. Setting 65 50 Hz. Setting Underfrequency Relay Model WUF-12-5060 35 PART NUMBER SELECTION 30 60 0 1 2 3 4 5 6 0 1 Pick-Up Time Delay (sec) 2 3 4 5 6 Drop-Out Time Delay PRODUCT SPECIFICATIONS Part Number WOF/WUF Nominal Voltage (±20%) ................. 120, 230, 380 and 460 volts Nonimal Frequencies ....................... 50, 60 and 400 Hz. Trip Point .......................................... Screwdriver adjustable. Adjustment range in accordance with ordering information. Operating Temperature .................... -20oC to +65oC Differential ........................................ The frequency pitch-up to drop-out differential is .5% max Voltage Drift ..................................... ± .05% maximum frequency error for input voltage variation of ±10% Time Delay ........................................ See Time versus Frequency curves Surge Withstand Capability ............. In compliance with C37.90B ANSI/IEEE Output Contacts ............................... One set N.O., one set N.C. Sample Part No. WUF-12-5060-T Type: WUF = Underfrequency WOF = Overfrequency Input Voltage (VAC) 12 = 120 23 - 230 38 = 380 46 = 460 Frequency Range 4050 = 40-50 HZ 5060 = 50-60 HZ 6070 = 60-70 HZ 3540 = 350-400 HZ 4045 = 400-450 HZ (overfrequency only) Time Delay Options blank = Per Time Curve T = Adjustable Consult factory for additional models. Contact Ratings ................................ 5 amp resistive at 120 VAC or 28VDC Notes: 1. Remove black screws for access to the frequency and the time adjustments. 2. Clockwise rotation of the frequency potentiometer will raise the frequency trip point. 3. Clockwise rotation of the time adjustment, option "T" will increase the time for overfrequency relays and dropout time for underfrequency relays.. Tyco Electronics / www.tycoelectronics.com / Factory Direct Technical Support: 800-253-4560, ext. 2023 (U.S., Canada, Mexico) or 805-220-2020, ext. 2023 (International) 39