Categories | Motor Protection Relay |
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Brand Name: | GINRI |
Model Number: | WDB-1FMT |
Certification: | CE,CCC |
Place of Origin: | CHINA |
MOQ: | 20Pcs |
Payment Terms: | L/C, T/T, Western Union,Paypal |
Supply Ability: | 20000Pcs per month |
Delivery Time: | 1-30 days upon order quantity |
Packaging Details: | Relay is standard seaworthy package,1pcs individual box or 5pcs in a middle box, 200pcs per carton. Base quotation is blank package. OEM design is acceptable. |
Indicators: | LED display,2LEDs indicating trip, alert |
Output type: | 1 C/O for trip,1 C/O for alert |
Working conditions: | -25 ~65 , 85%RH,non-condensing |
Operating current range: | 1-10A,5-50A,10-100A,20-200A 80-400A,400-600A,600-800A |
Overvoltage: | 0-999V |
Overcurrent: | 1-999A |
Voltage Monitoring 3 Phase Undervoltage Relay Screw Fixing Mounting 50/60 Hz
Why need the 4-20mA analog output
The 0-5V standard signal is not suitable for remote transmission, and does not meet the needs of 1-5V, 4-20mA input meters. This requires conversion, and the transmitter is one of the options for conversion. Transmitter becomes the middle bridge of signal conversion, electric protector can choose 4-20MA analog output, can make the signal transmission of protector more sensitive, thus improve the accuracy of protection
♦ 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 Typical Applications
-- Short-circuit Pumps
-- Locked-rotor Fans
-- Overcurrent Blowers
-- Undercurrent Motors
-- Phase loss Compressors
-- Phase unbalance
-- Overvoltage
-- Undervoltage
-- Ground fault
The reason maybe makes motor protector broken
In practical applications, there are many reasons that can cause
the motor to burn down. It can be divided into the following
categories:
(1) Motor overload caused by various reasons, the current is too
large;
(2) Current imbalance caused by too low or high voltage, unbalanced
phase, or lack of phase (including phase failure due to contactor
failure);
(3) The return air pressure caused by refrigerant leakage or
pipeline problems is too low, and the motor cooling is
insufficient;
(4) damage to the winding insulation or high water content of the
refrigerant, short circuit burned, etc. Theoretically, the overload
protector can effectively cope with the first two conditions, while
the thermal protector can cope with the first three conditions. The
“short circuit” in the fourth case may be related to the quality or
installation, or it may be related to the high water content of the
metal chips or the refrigerant. In actual use, several situations
may occur at the same time, and each other is a cause and effect.
It may not be possible to use a brand-new compressor as a
laboratory, and the problems are often simplified. The biggest
limitations of currently used thermal protectors and overload
protectors are that they cannot prevent all of the above-mentioned
phenomena from happening. Therefore, the protection of the motor
can only stay in the “cooling therapy” afterwards, that is,
temporarily stopping the compressor. Cool naturally and then
operate again. Thermal protectors and overload protectors do not
have a limited number of pull-in times, and the motor is often
burned in the "protection - operation - reprotect - rerun" cycle.
For emergencies, such as winding insulation damage or short circuit
caused by copper shavings, etc., the motor will be instantly burned
at high temperature, and the thermal protector and overload
protector will not react and cannot be protected.
♦ Technical data
Type | WDZ-1Z | WDZ-1F | WDZ-1F2 |
Rated voltage | 220VAC,380VAC ,50/60Hz | ||
Current range | 1-10A,5-50A,10-100A,20-200A,80-400A,400-600A,600-800A | ||
Protective functions | short-circuit, locked-rotor, overcurrent, undervurrent, phase loss, phase unbalance,overvoltage,undervoltage, earth fault | ||
Optional functions | RS-485 communication port | ||
Indicators | LED indicating voltage,current,operation status | ||
Output contacts | 1 C/O for trip,1 C/O for alert | ||
Contact capacity | 3A 380VAC | ||
Dimensions (H x W x D) | 118×54×135mm | 101×54×77mm(LED part) | 101×54×77mm(LED part) |
Mounting | screw fixing | LED part panel mounted and CT part screw fixing | LED part panel mounted |