Operating Instructions
Table Of Contents
- Converter with CU230P-2 Control Units
- Legal information
- Changes in this manual
- Table of contents
- 1 Fundamental safety instructions
- 2 Introduction
- 3 Description
- 4 Installing
- 4.1 Overview of the inverter installation
- 4.2 Installing reactors, filters and braking resistors
- 4.3 Installing Power Module
- 4.4 Installing Control Unit
- 4.5 Connecting inverters in compliance with EMC
- 5 Commissioning
- 6 Adapting the terminal strip
- 7 Configuring the fieldbus
- 8 Setting functions
- 8.1 Overview of the inverter functions
- 8.2 Inverter control
- 8.2.1 Switching the motor on and off
- 8.2.2 Inverter control using digital inputs
- 8.2.3 Two-wire control: method 1
- 8.2.4 Two-wire control, method 2
- 8.2.5 Two-wire control, method 3
- 8.2.6 Three-wire control, method 1
- 8.2.7 Three-wire control, method 2
- 8.2.8 Running the motor in jog mode (JOG function)
- 8.2.9 Switching over the inverter control (command data set)
- 8.3 Setpoints
- 8.4 Setpoint calculation
- 8.5 Motor control
- 8.6 Protection and monitoring functions
- 8.7 Application-specific functions
- 8.7.1 Unit changeover
- 8.7.2 Calculating the energy saving
- 8.7.3 Electrically braking the motor
- 8.7.4 Flying restart – switching on while the motor is running
- 8.7.5 Automatic switch-on
- 8.7.6 Kinetic buffering (Vdc min control)
- 8.7.7 PID technology controller
- 8.7.8 Free technology controllers
- 8.7.9 Monitoring the load torque (system protection)
- 8.7.10 Load failure monitoring
- 8.7.11 Real time clock (RTC)
- 8.7.12 Time switch (DTC)
- 8.7.13 Record temperature via temperature-dependent resistances
- 8.7.14 Essential service mode
- 8.7.15 Multi-zone control
- 8.7.16 Bypass
- 8.7.17 Cascade control and hibernation mode
- 8.7.18 Free function blocks
- 8.8 Switchover between different settings
- 9 Backing up data and series commissioning
- 10 Corrective maintenance
- 10.1 Overview of replacing converter components
- 10.2 Replace Control Unit
- 10.3 Replacing the Control Unit without data backup
- 10.4 Replacing a Control Unit with active know-how protection
- 10.5 Replacing a Power Module
- 10.6 Upgrading the firmware
- 10.7 Firmware downgrade
- 10.8 Correcting an unsuccessful firmware upgrade or downgrade
- 10.9 If the converter no longer responds
- 11 Alarms, faults and system messages
- 12 Technical data
- A Appendix
- Index
Setting functions
8.7 Application-specific functions
Converter with CU230P-2 Control Units
202 Operating Instructions, 04/2014, FW V4.7, A5E34257946B AA
8.7.3.3
Dynamic braking
Typical applications for dynamic braking include:
● Horizontal conveyors
● Vertical and inclined conveyors
● Hoisting gear
For these applications, dynamic motor behavior with different speeds or continuous change
of direction is required.
Principle of operation
CAUTION
Burns when touching a hot braking resistor
A braking resistor reaches high temperatures during operation. Touching the braking
resistor may result in burns.
• Do not touch a braking resistor during operation.
The inverter controls the braking chopper depending on its DC-link voltage. The DC-link
voltage increases as soon as the inverter absorbs the regenerative power when braking the
motor. The braking chopper converts this power into heat in the braking resistor. This
prevents the DC-link voltage from increasing above the limit value U
DC link, max
.
Figure 8-23 Simplified representation of dynamic braking with respect to time