Refer to
Staging Mode and Alternation
, par. 25-56, and Figure
7-5 for description of staging and alternation.
2.21.6. 25-8* Status
Readout parameters informing about the operating status of the cascade controller and the pumps
controlled.
25-80 Cascade Status
Option:
Function:
Disabled
Emergency
Off
In Open Loop
Frozen
Jogging
Running
Running FSBW
Destaging
Alternating
Lead Not Set
Read out of the status of the Cascade Controller.
Disabled
: Cascade Controller is disabled (
Cascade Controller
,
Par. 25-00).
Emergency
: All pumps have been stopped by means of a Coast/
Coast inverse or an External Interlock command applied to the
frequency converter.
Off
: All pumps have been stopped by means of a Stop command
applied to the frequency converter.
In Open Loop
:
Configuration Mode
, Par. 1-00, has been set for
Open Loop. All fixed speed pumps are stopped. The variable
speed pump will continue to run.
Frozen
: Staging/destaging of pumps has been locked and ref-
erence locked.
Jogging
: All fixed speed pumps are stopped. When stopped, the
variable speed pump will run at jog speed.
Running
: A Start command is applied to the frequency converter
and the cascade controller is controlling the pumps.
Running FSBW
: The frequency converter is tripped off and the
Cascade Controller is controlling the fixed speed pumps based
on
Fixed Speed Bandwidth
, par. 25-22.
Staging
: The Cascade Controller is staging fixed speed pumps.
Destaging
: The Cascade Controller is destaging fixed speed
pumps.
Alternating
: The
Lead Pump Alternation
, par. 25-50, selection is
different than
Off
[0] and an alternating sequence is taking
place.
Lead Not Set
: No pump available to be assigned as variable
speed pump.
VLT
®
AQUA Drive Programming Guide
2. Parameter Description
MG.20.O2.02 - VLT
®
is a registered Danfoss trademark
241
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