Trane TR200 - Page 223

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.
NOTE
Do not set par.14-20 Reset Mode to [13] Infinite auto reset when par.22-23 No-Flow Functionis set to [3] Alarm. Doing
so will cause the drive to continuously cycle between runni
ng and stopping when a No Flow condition is detected.
NOTE
If the drive is equipped with a constant speed bypass with an automatic bypass function that starts the bypass if the
drive experiences a persistent alarm condition, be sure to disable the bypass’ automa
tic bypass function, if [3] Alarm
is selected as the No-Flow Function.
22-24 No-Flow Delay
Range: Function:
10 s* [1 - 600 s] Set the time. Low Power/Low Speed must remain detected to activate
signal for actions. If detection disappears before the timer runs out, the
timer will be reset.
22-4* Sleep Mode
If the load on the system allows for stop of the motor and the load is monitored, the motor can be stopped by
activating the sleep mode function. This is not a normal stop command, but ramps the motor down to 0 RPM
and stops energizing the motor. When in sleep mode, certain conditions are monitored to find out when load
has been applied to the system again.
Sleep mode can be activated either from the No Flow Detection/Minimum Speed Detection (must be program-
med via parameters for No-Flow Detection, see the signal flow diagram in parameter group 22-2*, No-Flow
Detection) or via an external signal applied to one of the digital inputs (must be programmed via the parameters
for configuration of the digital inputs, par. 5-1* selecting [66] Sleep Mode). Sleep mode is activated only when
no wake-up conditions are present.
Parameter Description
4-186 TR200 Programming Guide