Marsh Bellofram Diversified Electronics Division SLB Series Phase Unbalance Monitor - Marsh Bellofram - #1

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800.727.5646 atcdiversified.com Diversified Electronics SLB Series Phase Voltage Monitors // SLB Series 221 P h as e Un b a l a n c e M o n i t or The SLB Series is designed to protect three-phase equipment against Phase Unbalance, Phase Loss, and Phase Reversal conditions. With normal operating voltages in the proper ABC sequence and the 120 VAC control voltage applied, the internal relay will energize (PICKUP). When any combination of Phase Unbalance exceeding the preset value or Phase Loss or Phase Reversal occurs for longer than the preset drop out time, the output relay will de-energize (DROP-OUT). If the control voltage is removed, the relay will de-energize. The wide input voltage range permits use on any one of several standard line voltages without recalibrating. The unbalance detection level is adjustable from 2% to 15%. Both Delta and Wye systems may be monitored. In Wye systems, connections to neutral are not required. The LED indicator glows when conditions are normal. NOTE: A balanced condition exists and the output relay will energize when there is a complete absence of voltage on all three phases (Terminals 1, 3 and 5) and the control voltage is continuously applied to (Terminals 11 and 12). For this reason, the SLB series is ideally suited for load side monitoring applications. \\\OPERATION \\\SPECIFICATIONS OUTPUT RATING SPDT, 10 Amps @ 120 VAC, 5 Amps @ 240 VAC, Resistive PHASE SEQUENCE ABC (Will Not Operate CBA) OPERATING VOLTAGE See Table Below CONTROL VOLTAGE 120 VAC, 1 Phase, 60 Hz POWER REQUIRED 3 VA, Max. PHASE UNBALANCE RANGE 2% to 15%, Adjustable INDICATORS LED Glows When All Conditions Are Normal RESPONSE TIMES Operate 60 mSEC, Fixed Release 0.1 to 5 SEC, Adjustable TEMPERATURE RATING Operate 32° to +104°F (0° to +40°C) Storage -49° to 185°F (-45° to +85°C) ENCLOSURE Style “E” LEXAN® Surface Mount WEIGHT 1 lb. 2 oz. The SLB Series will not detect an equal and simultaneous reduction in voltage on all three lines (Brown Out). \\\DIMENSIONS (INCHES) \\\WIRING MODEL NUMBER OPERATING VOLTAGE RESET HYSTERESIS SLB-200-ALEA Standard 0-300; 3 Ø Line Voltages 60 Hz Automatic 10% of Unbalance Setting SLB-200-ALER Manual None SLB-400-ALEA Standard 300-500; 3 Ø Line Voltages 60 Hz Automatic 10% of Unbalance Setting All voltages referenced on this page are phase-to-phase.