Danfoss VLT 8000 AQUA Operations Instructions download pdf (Page 27)

MG.60.N2.02 - VLT is a registered Danfoss trademark

VLT

5000 / VLT

6000 HVAC / VLT

8000 AQUA

Network Variable Inputs to VLT

Network

Drive

Control

Input

The most common functions for controlling the

VLT Adjustable Frequency Drive from the

LonWorks network are made readily available.

Those functions and their descriptions are

presented in the table below. The control word

function accesses additional drive capabilities

for network control.

The choice of open loop or closed loop

operation of the drive is selected in parameter

100,

Configuration

Using nviRefPcnt, the drive's reference is

expressed as a percentage of the reference

range. The range is set using parameters 204,

Min. Reference

and 205,

Max. Reference

. In

open loop operation, reference represents the

drive's desired output speed. In this case, set

Min. Reference

to 0 Hz and

Max. Reference

equal to

Max. Frequency

in parameter 202.

In closed loop operation, reference represents

the desired setpoint. It is recommended that

parameters 204 and 205 be set equal to

parameters 201,

Min. Frequency

and 202,

Max. Frequency

Start/Stop

and

Reset fault

SNVT_lev_disc. ST_OFF and ST_NUL are

interpreted as low or “0.” ST_LOW, ST_MED,

ST_HIGH, and ST_ON are interpreted as high

or “1.”

NOTE

To optimize network performance

and for proper drive operation,

use only one of following input

reference commands.

Reference 1

Network variable nviRefPcnt is a signed value.

It represents the desired percentage of the

VLT drive's reference range

Range: -163.840 - 163.835.

All references provided to the drive are added

to the total reference value. If reference is to

be controlled by the LonWorks bus only, ensure

that all other reference inputs are zero. This

means that digital input terminals and analog

input terminals should not be used for reference

signals. The default setting (0%) should be

maintained for preset references in parameters

211 (215) through 214 (218). Also, in closed

loop operation, the default setting (0.0) should

be maintained for drive setpoints in parameters

418 (215) and 419 (218).

Function SNVT type Variable Name Units VLT 6000/8000 VLT 5000

parameter parameter

Start/Stop SNVT_lev_disc nviStartStop Boolean 104 104

*Reset fault SNVT_lev_disc nviResetFault Boolean - -

Reference 1 SNVT_lev_percent nviRefPcnt 0.005% - -

Reference 3 SNVT_freq_hz nviRefHz 0.1 Hz - -

Control word SNVT_state nviControlword 16 Boolean - -

Drive Speed Setpoint

SNVT_switch NviDrvSpeedStpt - Ctrw. + Ref. Ctrw. + Ref.

Setpoint 1 SNVT_lev_percent NviSetpoint1 0.01% 418 215

Setpoint 2 SNVT_lev_percent NviSetpoint2 0.01% 419 216

Bus feedback1 SNVT_lev_percent NviFeedback1 0.01% 535 -

Bus feedback2 SNVT_lev_percent NviFeedback2 0.01% 536 -

Analog output 42 SNVT_lev_percent NviSetAnalog4 0.01% 364 -

Analog output 45 SNVT_lev_percent NviSetAnalog5 0.01% 365 -

* Reset on a transition from 0 to 1. A “0” must be sent after reset to enable the next reset.

Part of the LonMark Functional Profile for

Variable Speed Drive 6010 version 1.1

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Danfoss VLT 8000 AQUA Operations Instructions Page 27

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