Johnson Controls VS3 Series User Manual

173
Appendix A—Description of parameters
VARIABLE SPEED DRIVE SERIES III LIT-12012999—June 2018 www.johnsoncontrols.com
Code Modbus ID Parameter Application RO/RW
P6.1.6 312 Motor Thermal Time 1,2,3 RW
This parameter is used to set the time constant of the motor to reise to 63% of thermal
laod. The motor thermal time is specific to the motor design and it varies between different
motor manufacturers.
If the motor’s t6–time (t6 is the time in seconds the motor can safely operate at six times the rated
current) is known (given by the motor manufacturer) the time constant parameter can be set based on
it. As a rule of thumb, the motor thermal time constant in minutes is equal to 2xt6. If the drive is in stop
stage, the time constant is internally increased to three times the set parameter value. The cooling in
the stop stage is based on convection and the time constant is increased.
Figure 63. Motor temperature calculation
Time Constant T
*
Time
Fault/Warning
P9.8
* Changes by motor size and adjusted with P9.10.
Motor Temperature
= (I/I
T
)
2
x (1-e
-t/T
)
Motor
Current
I/I
T
Trip Area
105%
Motor
Temperature
Θ
P6.1.7 313 Stall Protection 1,2,3 RW
Use this parameter to set the device reaction after a “Motor Stalled” condition has occured. This is
customer selectable based off of current level, frequency level and time.
0 = No Action
1 = Warning
2 = Fault
3 = Fault, Coast

Johnson Controls VS3 Series Specifications

General

Brand	Johnson Controls
Model	VS3 Series
Category	Inverter
Language	English