77C-LR工业自动化与控制的保护继电器系统规格书PDF中文资料

Description

The single-phase 77C unit is a fully-programmable, electronic overload relay designed to protect any motor drawing 2-800

full load A (external CTs are required above 90 A). Common applications include conveyor systems, HVAC equipment,

saws and grinders, fan motors, and almost any pumping application. The 77C and 777-HVR-SP (family of products) are

for single-phase 100-240 V ac applications.

All of the overload relays provide unsurpassed protection by combining overload, underload, and voltage in one unit.

For standalone applications, the units incorporate a 3-digit LED display that is used for programming, providing real-time

operational information, and displaying diagnostic codes to aid in troubleshooting a fault condition. These units also feature

a communications network port that can be used with communication modules, listed in the 777 accessories section, to

form a Modbus, DeviceNet™, Profibus, or Ethernet network. Up to 99 units can be remotely monitored and controlled from

a PC, PLC, or SCADA system, and data logging through a PC with the optional Solutions software. This capability allows

for a simple, cost-effective way to meet new requirements for arc-flash safety.

Applications

• Conveyor systems

• HVAC equipment

• Saws and grinders

• Fan motors

FEATURES BENEFITS

Built-in display Visual indication for programming, viewing real-time voltage or

current, and last fault code

Programmable voltage and current settings Allows usage on a wide range of systems

3 selectable restart options Choose from automatic, semi-automatic, or manual to best meet

individual application needs

3 programmable restart delay timers Program separate restart delay time for rapid cycle protection, motor

cool down, and dry-well recovery

Remote display compatibility Increases safety through remote display of real-time data and fault

history. Aids with arc-flash safety regulations

Flexible reset Reset can be done through pushbutton on relay or remotely with

optional 777-MRSW or OL-Reset remote reset kit