Vibration And Shock; Control Structures; Control Structure Open Loop; Local (Hand On) And Remote (Auto On) Control - Danfoss VLT Compressor Drive CDS 803 Design Manual

Product Overview

2.5 Vibration and Shock

The frequency converter has been tested according to the
2 2
procedure based on the shown standards, Table 2.2.
The frequency converter complies with requirements that
exist for units mounted on the walls and floors of

2.6 Control Structures

Select open loop or closed loop in parameter 1-00 Configuration Mode.

2.6.1 Control Structure Open Loop

Reference
handling
Remote
reference
Auto mode
Hand mode
Local
reference
scaled to
Hz
LCP Hand on,
off and auto
on keys
Illustration 2.1 Open-loop Structure
In the configuration shown in Illustration 2.1,
parameter 1-00 Configuration Mode is set to [0] Open loop.
The resulting reference from the reference handling system
or the local reference is received and fed through the ramp
limitation and speed limitation before being sent to the
motor control. The output from the motor control is then
limited by the maximum frequency limit.
2.6.2 Local (Hand On) and Remote (Auto
On) Control
The frequency converter can be operated manually via the
local control panel (LCP) or remotely via analog/digital
inputs or serial bus. If allowed in parameter 0-40 [Hand on]
Key on LCP, parameter 0-44 [Off/Reset] Key on LCP, and
parameter 0-42 [Auto on] Key on LCP, it is possible to start
and stop the frequency converter via LCP by pressing
[Hand On] and [Off/Reset]. Alarms can be reset via the
[Off/Reset] key.
12
®
VLT Compressor Drive CDS 803
P 4-14
Motor speed
high limit [Hz]
Remote
Reference
Local
P 4-12
Motor speed
low limit [Hz]
Danfoss A/S © 12/2015 All rights reserved.
production premises, and in panels bolted to walls or
floors.
IEC/EN 60068-2-6 Vibration (sinusoidal) - 1970
IEC/EN 60068-2-64 Vibration, broad-band random
Table 2.2 Standards
100%
P 3-4* Ramp 1
P 3-5* Ramp 2
0%
Ramp
100%
-100%
Hand Off
On Reset
Illustration 2.2 LCP Keys
Local reference forces the configuration mode to open
loop, independent on the setting of parameter 1-00 Config-
uration Mode.
Local reference is restored at power-down.
To motor
control
P 4-10
Motor speed
direction
Auto
On
MG18N202