Danfoss VLT HVAC Series, Руководство по программированию, Страница: 265 / 338

25-27 Stage Function
Option: Function:
If the stage function is set to
Disabled
[0], par.25-28
Stage Function Time
will not be activated.
[0] Disabled
[1] * Enabled
25-28 Stage Function Time
Range: Function:
15 s* [0 - 300 s] Stage function time is programmed to avoid frequent staging of the fixed speed pumps. The stage
function time starts if it is
Enabled
[1] by par.25-27
Stage Function
, and when the variable speed
pump is running at
Motor Speed High Limit
, par.4-13
Motor Speed High Limit [RPM]
or par.
4-14
Motor Speed High Limit [Hz]
, with at least one fixed speed pump in the stop position. When
the programmed value of the timer expires, a fixed speed pump is staged.
25-29 Destage Function
Option: Function:
The de-stage function ensures that the lowest number of pumps are running to save energy and to
avoid dead head water circulation in the variable speed pump. If the de-stage function is set to
Disabled [0], the par.25-30 Destage Function Time will not be activated.
[0] Disabled
[1] * Enabled
25-30 Destage Function Time
Range: Function:
15 s* [0 - 300 s] The de-stage function timer is programmable to avoid frequent staging/de-staging of the fixed
speed pumps. The de-stage function time starts when the adjustable speed pump is running at par.
4-11
Motor Speed Low Limit [RPM] or par.4-12 Motor Speed Low Limit [Hz] , with one or more fixed
speed pumps in operation and system requirements satisfied. In this situation, the adjustable speed
pump contributes a little to the system. When the programmed value of the timer expires, a stage
is removed, avoiding dead head water circulation in the adjustable speed pump.
VLT ® HVAC Drive Programming Guide 3 Parameter Description
MG.11.C6.22 - VLT ® is a registered Danfoss trademark
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