Area
Component
Functions
1
Line power input
•
AC line power supply to the
adjustable frequency drive.
2
Rectifier
•
The rectifier bridge converts
the AC input to DC current to
supply inverter power.
3
DC bus
•
Intermediate DC bus circuit
handles the DC current.
4
DC reactor
•
Filters the intermediate DC
circuit current.
•
Provides line transient
protection.
•
Reduces the root mean square
(RMS) current.
•
Raises the power factor
reflected back to the line.
•
Reduces harmonics on the AC
input.
5
Capacitor bank
•
Stores the DC power.
•
Provides ride-through
protection for short power
losses.
6
Inverter
•
Converts the DC into a
controlled PWM AC waveform
for a controlled variable
output to the motor.
7
Output to motor
•
Regulated 3-phase output
power to the motor.
8
Control circuitry
•
Input power, internal
processing, output and motor
current are monitored to
provide efficient operation
and control.
•
User interface and external
commands are monitored and
performed.
•
Status output and control can
be provided.
Table 1.2 Legend to
1.4.3 Enclosure Sizes and Power Ratings
For enclosure sizes and power ratings of the adjustable
frequency drives, refer to
chapter 9.9 Enclosure Sizes, Power
.
1.4.4 Safe Torque Off (STO)
The VLT
®
Midi Drive FC 280 adjustable frequency drive
supports Safe Torque Off (STO). See
Sizes, Power Ratings and Dimensions
for details about the
installation, commissioning, maintenance and technical
data of STO.
1.5 Approvals and Certifications
For compliance with the European Agreement concerning
International Carriage of Dangerous Goods by Inland
Waterways (ADN), refer to
ADN-compliant Installation
in the
VLT
®
Midi Drive FC 280
Design Guide
.
Applied standards and compliance for STO
Use of STO on terminals 37 and 38 requires that the user
satisfies all provisions for safety including relevant laws,
regulations and guidelines. The integrated STO function
complies with the following standards:
•
IEC/EN 61508: 2010 SIL 2
•
IEC/EN 61800-5-2: 2007 SIL2
•
IEC/EN 62061: 2012 SILCL of SIL2
•
EN ISO 13849-1: 2008 Category 3 PL d
1.6 Disposal
Do not dispose of equipment containing
electrical components together with
domestic waste.
Collect it separately in accordance with
local and currently valid legislation.
Introduction
VLT
®
Midi Drive FC 280
4
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