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Marsh Bellofram Diversified Electronics Division SLE Series Phase Monitor

Marsh Bellofram Diversified Electronics Division SLE Series Phase Monitor

Product catalog summary

Overview
The SLE Series by Diversified Electronics is designed to protect 3-phase equipment from phase unbalance, phase loss, and under voltage. It operates by energizing an internal relay when normal voltage is present and de-energizing it when phase loss or voltage anomalies occur. The system automatically resets when conditions normalize and can monitor both Delta and Wye systems without requiring neutral connections in Wye systems.

Key Features

Protection against phase loss, under voltage, and phase unbalance.
Lock shaft adjustment for phase unbalance percentage, under voltage drop-out, and automatic reset.
Compatible with Delta or Wye systems.

Operation
The SLE Series detects phase loss and regeneration conditions, ensuring protection even when a phase is lost during motor operation.

Specifications

Operating Voltage: Models available up to 480 VAC.
Under Voltage Drop-Out Range: Adjustable per model specifications.
Power Required: Varies by model, with a maximum of 7 VA.
Output Rating: DPDT, with varying amperage and voltage ratings depending on the model.
Phase Unbalance Range: Adjustable from 2% to 10%.
Indicators: LED indicates normal conditions.
Response Times: Vary based on operating voltage, with faster response for models up to 300 VAC.
Temperature Rating: Operational from 32° to 131°F, storage from -49° to 185°F.
Weight: 12.5 to 13 oz.

Models and Operating Voltage

SLE-120-ALE: 120 VAC, under voltage range 95-115 Adj.
SLE-230-ALE: 208/240 VAC, under voltage range 185-230 Adj.
SLE-380-ALE: 380 VAC, under voltage range 315-390 Adj.
SLE-440-ALE: 440/480 VAC, under voltage range 370-460 Adj.

Additional Information
Transient protection is rated at 1000 volts for 8 milliseconds, and the system is covered by U.S. Patent Number 4,331,995.

Catalog excerpts

Marsh Bellofram Diversified Electronics Division SLE Series Phase Monitor-1

• Models Available up to 480 VAC PROTECTS 3-PHASE EQUIPMENT AGAINST: • Phase Loss • Under Voltage • Phase Unbalance LOCK SHAFT ADJUSTMENT FOR: • Phase Unbalanced Percent • Under Voltage Drop Out • Automatic Reset • Delta or Wye Systems SLE Series Diversified Electronics atcdiversified.com 800.727.5646 224 Phase Voltage Monitors // SLE Series The SLE Series is designed to protect 3-phase equipment against Phase Unbalance, Phase Loss, and Under Voltage. With normal operating voltage present on all three phases, the internal relay will energize (PICK-UP). When a phase loss occurs or the voltages fall outside the preset unbalance or under voltage settings, the internal relay will de-energize (DROP-OUT). The relay automatically resets when the line conditions return to normal. Both Delta and Wye systems may be monitored. In Wye Systems, connections to neutral are not required. NOTE: When a phase is lost while the motor is running, a condition known as regeneration occurs where a voltage is induced into the open phase nearly equal in magnitude to the normal phase-to-phase voltage. The SLE series is designed to detect this condition when properly adjusted. P h a s e M o n i t o r \\\OPERATION \\\DIMENSIONS (INCHES) \\\WIRING MODEL NUMBER OPERATING VOLTAGE UNDER VOLTAGE DROP-OUT RANGE POWER REQUIRED HYSTERESIS OUTPUT RATING SLE-120-ALE 120 VAC 95-115 Adj. 3 VA Max. 5 VAC DPDT, 5 Amps, Resistive; 345 VA, SLE-230-ALE 208/240 VAC 185-230 Adj. Inductive @ 240 VAC SLE-380-ALE 380 VAC 315-390 Adj. 7 VA Max. 10 VAC DPDT, 3 Amps, Resistive; 360 VA, SLE-440-ALE 440/480 VAC 370-460 Adj. Inductive @ 600 VAC All voltage referenced are phase-to-phase. \\\SPECIFICATIONS OPERATING VOLTAGE See Table Below TRANSIENT PROTECTION 1000 Volts For 8 mSEC RESET Automatic PHASE UNBALANCE RANGE 2% to 10%, Adjustable INDICATORS LED Glows When All Conditions Are Normal RESPONSE TIMES MODELS UP TO 300 VAC Operate 60 Milliseconds Release 0.5 Seconds RESPONSE TIMES MODELS OVER 300 VAC Operate 1 Second Release 2 Seconds TEMPERATURE RATING Operate 32° to +131°F (0° to +55°C) Storage -49° to 185°F (-45° to +85°C) U.S. PATENT NUMBER 4,331,995 WEIGHT 12.5 to 13 oz.

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