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MG.60.N1.22 - 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
1)
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 -
* Reset on a transition from 0 to 1. A “0” must be sent after reset to enable the next reset.
1)
Part of the LonMark Functional Profile for
Variable Speed Drive 6010 version 1.1
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