H100LonWorksManual
22
Network Input Variables
Function
Variable Name
SNVT Type
Min
Max
Drive Speed Setpoint
nviDrvSpeedStpt
SNVT_switch
N/A
N/A
Drive Speed SetpointScaling
nviDrvSpeedScale
SNVT_lev_percent -163.840%
163.830%
4.2.1 ‘nviDrvSpeedStpt’ and ‘nviDrvSpeedScale’ Variables
Definition
Network input SNVT_switch
nviDrivSpeedStpt
Network input SNVT_lev_percent
nviDrvSpeedScale
Description
Variables ‘nviDrvSpeedStpt’ and ‘nviDrvSpeedScale’ are used for run commands and speed references. The state
variable value for ‘nviDrvSpeedStpt’ decides whether to run or stop an inverter. The inverter stops when the
‘nviDrvSpeedStpt’ state is set to ‘0’, and runs when it is set to ‘1.’
The ‘nviDrvSpeedScale’ variable provides rotation direction information for the inverter. The inverter operates in the
forward direction (Fx) when the ‘nviDrvSpeedScale’ value is set to a positive number, and in the reverse direction (Rx)
when it is set to a negative number.
Frequency reference information is given by a combination of the ‘nviDrvSpeedScale’ and ‘nviDrvSpeedStpt’ variable
values. The ‘nviDrvSpeedScale’ and ‘nviDrvSpeedStpt’ values are in percentages (%).
To calculate the frequency reference, multiply the ‘nviDrvSpeedStpt’ value with the ‘nviDrvSpeedScale’ value, and
then multiply the resulting value (%) with the base frequency. This means that the ‘nviDrvSpeedScale’ variable
provides the scale value for the ‘nviDrvSpeedStpt’ variable.
For Example, if the ’nviDrvSpeedStpt’ value is set to ‘100 (%)’ and the ‘nviDrvSpeedScale’ value is set to ‘-80 (%),’ the
resulting value will be -80% (1 X -0.8 = -0.8). As a result, the inverter operates in the reverse direction, at a frequency
that is 80% of the base frequency (if the base frequency is set to 60.00 Hz) and the resulting frequency reference will
be 48Hz (60.00Hz X 0.8).
The ‘nviDrvSpeedScale’ value range is between -163.840% – 163.830%. Therefore, a value of 0x7fff (+163.835%)
becomes an invalid data.
