Trane TR200 Series Programming Manual page 216

22-23 No-Flow Function
Common actions for Low Power Detection and Low Speed Detection (Individual selections not possible).
Option:
[0] * Off
[1] Sleep Mode
[2] Warning
[3] Alarm
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's automatic bypass function,
if [3] Alarm is selected as the No-Flow Function.
22-24 No-Flow Delay
Range:
10 s* [1 - 600 s]
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.
To make it possible to use e.g. an electro-mechanical flow switch to detect a no flow condition and activate Sleep
Mode, the action takes place at raising edge of the external signal applied (otherwise the frequency converter
would never come out of Sleep Mode again as the signal would be steady connected).
Note
If Sleep Mode is to be based on No Flow Detection/Minimum Speed, remember to choose Sleep Mode [1] in
par.22-23 No-Flow Function.
TR200 Programming Guide
Function:
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.
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.
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.
Function:
Set the time Low Power/Low Speed must stay detected to activate signal
for actions. If detection disappears before run out of the timer, the timer
will be reset.
Parameter Description
215