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Network
The most common functions for controlling the
VLT Adjustable Frequency Drive from the
Drive
LonWorks network are made readily available.
Control
Those functions and their descriptions are
Input
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 .
Function
Start/Stop
*
Reset fault
Reference 1
Reference 3
Control word
Drive Speed Setpoint
Setpoint 1
Setpoint 2
Bus feedback1
Bus feedback2
Analog output 42
Analog output 45
*
Reset on a transition from 0 to 1. A
Part of the LonMark Functional Profile for
1)
Variable Speed Drive 6010 version 1.1
26
SNVT type
Variable Name
SNVT_lev_disc
nviStartStop
SNVT_lev_disc
nviResetFault
SNVT_lev_percent nviRefPcnt
SNVT_freq_hz
nviRefHz
SNVT_state
nviControlword
1)
SNVT_switch
NviDrvSpeedStpt
SNVT_lev_percent NviSetpoint1
SNVT_lev_percent NviSetpoint2
SNVT_lev_percent NviFeedback1
SNVT_lev_percent NviFeedback2
SNVT_lev_percent NviSetAnalog4
SNVT_lev_percent NviSetAnalog5
"
"
0
must be sent after reset to enable the next reset.
Network Variable Inputs to VLT
VLT
®
5000 / VLT
®
6000 HVAC / VLT
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).
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."
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.
Units
VLT 6000/8000
parameter
Boolean
104
Boolean
-
0.005%
-
0.1 Hz
-
16 Boolean
-
-
Ctrw. + Ref.
0.01%
418
0.01%
419
0.01%
535
0.01%
536
0.01%
364
0.01%
365
MG.60.N2.02 - VLT is a registered Danfoss trademark
®
8000 AQUA
NOTE
VLT 5000
parameter
104
-
-
-
-
Ctrw. + Ref.
215
216
-
-
-
-
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