Trane TR200 - 22-23 No-Flow Function

If (Error x Gain) jumps with a value equal to what is set in par. 20-14 Maximum Reference/Feedb. the PID con-
troller will try to change the output speed equal to what is set in par. 4-13
Motor Speed High Limit [RPM] /
par. 4-14
Motor Speed High Limit [Hz] but in practice of course limited by this setting.
The proportional band (error causing output to change from 0-100%) can be calculated by means of the formula:
(
1
Proportional Gain
)
×
(
Max Reference
)
Always set the desired for par. 20-14 Maximum Reference/Feedb. before setting the values for the PID controller in
parameter group 20-9*.
20-94 PID Integral Time
Range: Function:
20.00 s* [0.01 - 10000.00 s] Over time, the integrator accumulates a contribution to the output from
the PID controller as long as there is a deviation between the Reference/
Setpoint and feedback signals. The contribution is proportional to the
size of the deviation. This ensures that the deviation (error) approaches
zero.
Quick response on any deviation is obtained when the integral time is
set to a low value. Setting it too low, however, may cause the control to
become unstable.
The value set, is the time needed for the integrator to add the same con-
tribution as the proportional part for a certain deviation.
If the value is set to 10,000, the controller will act as a pure proportional
controller with a P-band based on the value set in par. 20-93
PID Propor-
tional Gain. When no deviation is present, the output from the propor-
tional controller will be 0.
22-22 Low Speed Detection
Option: Function:
[0] * Disabled
[1] Enabled Select Enabled for detecting when the motor operates with a speed as
set in par. 4-11
Motor Speed Low Limit [RPM] or par. 4-12 Motor Speed
Low Limit [Hz].
22-23 No-Flow Function
Common actions for Low Power Detection and Low Speed Detection (Individual selections not possible).
Option: Function:
[0] * Off
[1] Sleep Mode The drive will enter Sleep Mode and stop when a No Flow condition is
detected. See parameter group 22-4* for programming options for Sleep
Mode.
[2] Warning The drive will continue to run, but activate a No-Flow Warning [W92]. A
drive digital output or a serial communication bus can communicate a
warning to other equipment.
[3] Alarm The drive will stop running and activate a No-Flow Alarm [A 92]. A drive
digital output or a serial communication bus can communicate an alarm
to other equipment.
How to program the Frequency Converter
BAS-SVX19C-EN 6-53