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Model 257 - 3-Phase Monitor www.Time-Mark.com

The Model 257 continuously monitors 3-phase power lines for abnormal conditions. When properly adjusted, the Model 257 monitor will detect phase loss on a loaded motor even when regenerated voltage is present.

Manufacturer - Time Mark Corporation
Model # - 258 3-Phase Monitor
Submitted By - Time Mark Corporation (Manufacturer)
Country - United States
Category - Industrial : Industrial Controls : 3-Phase Monitors

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Specifications

Nominal AC Voltage :   120VAC,208/240VAC,380VAC,40VAC
Adjustment Range(VAC) :   85-120,160-240,380-480,300-400
Frequency :   50 Hz,60 Hz, 400 Hz
Power Consumption (W) :   0.75, 1.5, 3.75, 4.5W
Transient Protection :   2500VRMS for 10 msec
Repeat Accuracy :   ± 0.1% of set point (fixed conditions)
Response Time :   50 msec (set or reset)
Dead Band :   Approximately 2%
Output Contacts :   SPDT 10A at 240 VAC resistive
Agency Approval :   UL Recognized* and CSA Certified* (on some models)

Details

The Model 257 continuously monitors 3-phase power lines for abnormal conditions. When properly adjusted, the Model 257 monitor will detect phase loss on a loaded motor even when regenerated voltage is present.

This device consists of a solid-state voltage and phase-angle sensing circuit, driving an electromechanical relay. When correct voltage and phase rotation are applied, the internal relay will energize. A fault condition will de-energize the relay. When the fault is corrected, the monitor will automatically reset (a manual reset version is also available).

The Model 257 does not require a neutral connection and can be used with Wye or Delta systems. Voltage ranges are sufficiently wide to allow for proper adjustment to existing conditions. Both TRIP and NORM condition indicators are provided to aid in adjustment and system trouble-shooting.

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