77C-KW工業(yè)自動化與控制的保護繼電器系統(tǒng)規(guī)格書PDF中文資料

Description

The 77C-KW/HP and 77C-LR-KW/HP are fully programmable

pump protection relays which will monitor the voltage and

current for high or low voltage, overload and underload

conditions based on power, in one package. The underpower trip

feature is desirable anytime the current vs.load characteristic is

non-linear or has little change. In general terms, smaller motors

and slow-speed motors have little change in current over the

normal load range. Larger motors that are running light loads will

also show small current changes over the operating load range.

Common uses include pumping applications where motors run

slower than around 3400 rpm and usually have small current vs

load changes; such as slow speed mixer or agitator motors up to

50 hp, and magdrive or can pumps.

FEATURES BENEFITS

Underload protection Increases reliability for non-linear motors where the

load characteristic has little change

Built-in display

Visual indication for programming, viewing real-time

voltage, current, kilowatts or horsepower, and last

fault code

15 programmable

criteria settings

Allows user flexibility to fine-tune the relay for

maximum protection in any application.

Last fault memory Provides instant troubleshooting diagnostics

Remote display

compatibility

Increases safety through remote display of real-time

data and fault history, without the need to open the

cabinet. Aids with arc flash safety regulations.

Flexible reset

Reset options: automatic, manual using pushbutton

on relay, or remotely with optional 777-MRSW or

OL-RESET remote reset kit.

Network

communications

capability

Compatible with Modbus using optional

communications module (RS485MS-2W)