Comparators; Logic Rules; Vlt® Compressor Drive Cds 803 Protections; Mains Input Protection - Danfoss VLT CDS 803 Manual

VLT® Compressor Drive CDS 803
Design Guide
Start
event P13-01
State 1
13-51.0
13-52.0
Stop
event P13-02
State 4
13-51.3
13-52.3
Illustration 10: Order of Execution when 4 Events/Actions are Programmed

3.2.2.9.1 Comparators

Comparators are used for comparing continuous variables (output frequency, output current, analog input, and so on) to fixed pre-
set values.
Par. 13-10
Comparator Operand
Par. 13-12
Comparator Value
Illustration 11: Comparators

3.2.2.9.2 Logic Rules

Combine up to 3 boolean inputs (TRUE/FALSE inputs) from timers, comparators, digital inputs, status bits, and events using the
logical operators AND, OR, and NOT.
Par. 13-41
Logic Rule Operator 1
Par. 13-40
Logic Rule Boolean 1
Par. 13-42
Logic Rule Boolean 2 . . .
. . .
Par. 13-44
Logic Rule Boolean 3
Illustration 12: Logic Rules
3.3 VLT® Compressor Drive CDS 803 Protections
The drive has a range of built-in protection functions to protect itself and the compressor during operation. For details of any re-
quired setup, in particular compressor parameters, refer to the VLT® Compressor Drive CDS 803 Programming Guide listed in
Additional Resources for parameter details and programming.

3.3.1 Mains Input Protection

The VLT® Compressor Drive CDS 803 offers various built-in input protections for the 3-phase power terminals L1, L2, and L3.

3.3.1.1 Mains Supply Failure, Momentary Dropouts, and Surges

During a mains dropout, the drive keeps running until the internal DC-link voltage drops below the minimum stop level, which is
typically around 15% or more below the lowest rated supply voltage of the drive. The mains voltage before the dropout and the
motor load determine how long it takes for the drive to coast.
Danfoss A/S © 2021.05
State 2
13-51.1
13-52.1
Stop
event P13-02
State 3
13-51.2
13-52.2
Stop
event P13-02
Par. 13-11
Comparator Operator
=
TRUE longer than.
. . .
. . .
Par. 13-43
Logic Rule Operator 2
. . .
. . .
Product Overview
AJ330233902305en-000201 / 130R0596 | 19
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