Danfoss VLT HVAC Series Programming Manual page 265

VLT ® HVAC Drive Programming Guide
25-27 Stage Function
Option:
[0] Disabled
[1] * Enabled
25-28 Stage Function Time
Range:
15 s* [0 - 300 s]
25-29 Destage Function
Option:
[0] Disabled
[1] * Enabled
25-30 Destage Function Time
Range:
15 s* [0 - 300 s]
Function:
If the stage function is set to Disabled
Function:
Stage function time is programmed to avoid frequent staging of the fixed speed pumps. The stage
function time starts if it is Enabled
Motor Speed High Limit
pump is running at
Motor Speed High Limit [Hz]
4-14
the programmed value of the timer expires, a fixed speed pump is staged.
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 Destage Function Time
[0], the par.25-30
Function:
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]
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.
MG.11.C6.22 - VLT ® is a registered Danfoss trademark
[0], par.25-28 Stage Function Time
[1] by par.25-27 Stage Function , and when the variable speed
Motor Speed High Limit [RPM]
, par.4-13
, with at least one fixed speed pump in the stop position. When
will not be activated.
or par.4-12 Motor Speed Low Limit [Hz]
3 Parameter Description
will not be activated.
3
or par.
, with one or more fixed
3-241