Pumps Under Current Protection Relay With Fault Recording 50/60 Hz WDB-1FMT

First, the basic principles of selection

Today, there are no uniform standards for motor protection products on the market, and the model specifications are varied. Manufacturers in order to meet the different needs of users derive a lot of series of products, a wide range of types of users to bring a lot of inconvenience to the user selection, the user should fully consider the actual needs of motor protection in the selection, a reasonable choice of protection and protection To achieve a good protection effect, to improve the reliability of equipment operation, reduce unplanned parking, reduce accident losses.

Second, the basic method of selection
(a) Conditions related to selection:
The selection of motor protection has a reasonable matching relationship between the motor and the protector. The following provides several protection-related conditions and factors, which provide reference for the selection of the user.
1 . Motor: We must first understand the model specifications, motor functional characteristics, protection type, rated voltage, rated current, rated power, power frequency, insulation level and so on. These contents can basically provide reference for the user how to correctly use and maintain and select protectors.
2 . Environmental conditions: Mainly refers to normal temperature, high temperature, cold, corrosion, vibration, sand, altitude, and electromagnetic pollution.
3 , the use of motor: mainly refers to the characteristics of the requirements of mechanical equipment, such as fans, pumps, air compressors, lathes, oil field pumping units and other mechanical characteristics of the load.
4 . Control system: The control modes include manual, automatic, local control, remote control, independent stand-alone operation, and centralized production line control. The starting methods include direct, step-down, star delta, frequency sensitive rheostat, frequency converter, and soft start.
5 . Other aspects: The user's management of on-site production monitoring is more casual or rigorous, and the severity of non-normal downtime impact on production.
There are many relevant factors related to the selection of the protector, such as the installation location, power supply conditions, and the power distribution system, etc.; it is also necessary to consider whether the newly purchased motor protection configuration, or the motor protection upgrade, or the accident motor The perfection of protection, etc.; also consider the difficulty of changing the motor protection mode and the degree of impact on the production; need to comprehensively consider the selection and adjustment of the protector according to the actual working conditions at the site.

♦ Features
-- Integrative structure or Separate structure-- Built-in LED and keypad afford a precise,digital setting-- Three-phase monitoring of short-circuit, locked-rotor,overcurrent, undervurrent, phase loss, phase unbalance,overvoltage,undervoltage-- Earth fault (should couple with ZCT) -- Fault recording -- RS-485 communication port (optional) -- 4-20 mA analog output (optional) unbalance,overvoltage,undervoltage -- 2 C/O output contacts, one for trip,one for alert

♦ Protective Functions
-- Short-circuit -- Locked-rotor -- Overcurrent -- Undercurrent
-- Phase loss -- Phase unbalance -- Overvoltage -- Undervoltage
-- Ground fault

♦ Typical Applications
• Pumps • Fans • Blowers • Motors • Compressors

♦ Technical data