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 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 Sleep Mode).

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 con-

nected).

If par. 25-26,

Destage at No-Flow

of lag pumps (fixed speed) before stopping the lead pump (variable speed).

When entering Sleep Mode, the lower status line in the Local Control Panel shows Sleep Mode.

See also signal flow chart in section 22-2*

There are three different ways of using the Sleep Mode function:

216

Remote Site Products - 1-888-532-2706 - www.remotesiteproducts.com

http://www.remotesiteproducts.com/p-20772-Danfoss-131X8135-VLT-Automation-VT-Drive-VFD-FC322-230V-5-HP.aspx

Function: