免责声明
Littelfuse产品并非为以下用途而设计，也不应被用于这些用途：包括但不限于汽车、航空航天、医疗、救生、维生、核设施、高可靠性应用、用于手术植入体内的装置，或者在产品故障或运行无法达到理想状态的情况下会造成人身伤害、死亡或财产损失的任何其他应用。除非在适用的Littelfuse产品文档中已有明确说明。 如果将产品用于相关Littelfuse文件中未明确说明的任何其他用途，则产品不享受Littelfuse质保。 如果将产品用于相关Littelfuse文件中未明确说明的其他用途，则Littelfuse不会为因此造成的任何索赔或损失承担责任。 除非经Littelfuse另行许可，否则Littelfuse产品的销售和使用应遵守Littelfuse销售条款与条件。 "Littelfuse"包括Littelfuse, Inc.及其所有附属实体。
The PLM series is a three-phase voltage monitor that continuously monitors each of the three phases. It monitors both delta and wye systems, and a connection to neutral is not required. The microcontroller circuit design protects against undervoltage, voltage unbalance, phase loss, and phase reversal. Protection is ensured when regenerated voltages are present.
工作原理
The output relay is energized and the LED glows green when all voltages are acceptable and the phase sequence is correct. Under and unbalanced voltages must be sensed for a continuous trip delay period before the relay de-energizes. Reset is automatic upon correction of the fault condition. The output relay will not energize if a fault condition is sensed as power is applied. The LED flashes red during the trip delay, then glows red when the output de-energizes. The LED flashes green/red if phase reversal is sensed.
Field Adjustment
Set the voltage adjustment knob at the desired operating line voltage for the equipment. This adjustment automatically sets the undervoltage trip point. Apply power. If the PLM fails to energize, (LED glows red) check wiring of all three phases, voltage, and phase sequence. If the phase sequence is incorrect, the LED flashes green/red. To correct this, swap any two line voltage connections at the mounting socket. No further adjustment should be required.
功能与特色
- Quick octal 8-pin mounting
- Proprietary microcontroller-based circuitry
- LED diagnostics
- Isolated, 10 A, SPDT output contacts
- Adjustable, nominal voltage set point
- Simple 3-wire connection for delta or wye systems
- ASME A17.1 Rule 210.6
- NEMA MG1 14:30, 14:35
- IEEE C62.41-1991 Level B