LOHER DYNAVERT T PWM Inverters

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LOHER DYNAVERT T PWM Inverters

General description

LOHER DYNAVERT T can be flexibly integrated into any automation concept – whether using conventional control technology or bus systems.

LOHER DYNAVERT T can be connected to any of the normally encountered line supply voltages – and can feed both synchronous and asynchronous motors. All of the drive requirements are taken into consideration from the word go – from the coupling, through the motor, cables, drive inverter, line supply situation and connection to the supervisory control system.

Features

Explosion protection

• ATEX‑certified for motors located in hazardous zones
• A main contactor is not required

Safe Torque Off

• The Safe Torque Off function prevents unexpected starting in compliance with EN 60204‑1, implemented according to EN 954‑1, Category 3

Power unit

• This corresponds to the EMC Directives (EN 61800-3 environment 2) as a result of the line filter integrated as standard·
• Low harmonics fed back into the line supply as a result of the integrated line reactor
• Output filter to permit longer motor cables
• Insulation monitoring for IT line supplies for 500/690 V drive units as well as ground fault monitoring for TN and TT line supplies integrated in the 400 V drive units
• Wide supply voltage range
• Low motor noise and low drive inverter and motor losses as a result of the optimized pulse pattern
• Normal fuses can be used for protection (gL characteristic)

Control section

• High level of personnel and plant protection through protective separation between the analog and digital control peripheral and the power unit according to VDE 0106/EN 50178

Operator control and setting

• Transparent operator control and setting using a menu-prompted 4-line plain text display with membrane keypad at the drive inverter – or up to 1,000 m away in the main control room via RS485
• Extensive functions using the Windowsbased PC operator control program

Communication

• Communication via a conventional terminal strip with freely‑programmable digital and analog inputs/outputs, with
  • parameterizable limit value signals
  • parameterizable timers
  • parameterizable damping elements
  • parameterizable drive inverter behavior when inputs/outputs respond
• Communication and parameterization via
  • PC using IMS (Inverter Management Software) via RS232/RS485
  • external operator panel via RS485
  • bus systems such as PROFIBUS DP or Modbus RTU

Drive behavior for LOHER DYNAVERT T

• Synchronous and asynchronous motors can be controlled
• Two closed‑loop control types for induction motors:
  • field‑oriented control for applications demanding a high dynamic performance
  • space‑vector control for standard applications (without feedback)
• Optimum braking without supplementary equipment using super‑saturation control

The following generally apply

• Automatic slip compensation
• Stall protection using current limiting control
• Flying restart circuit to connect to a rotating motor
• Automatic adaptation of the overload times
• Parameterizable DC braking for precise braking down to standstill
• Closed‑loop torque control