Danfoss vlt FC 102 Programming Guide

25-47 Destaging Speed [Hz]
Range: Function:
0 Hz* [0 - 0 Hz] Readout of the calculated value for
destaging speed. When removing a
xed speed pump to prevent an
undershoot of pressure, the variable
speed pump ramps up to a higher
speed. When the variable speed
pump reaches the destaging speed,
the xed speed pump is destaged.
Destaging speed is calculated based
on parameter 25-43 Destaging
Threshold and parameter 4-14 Motor
Speed High Limit [Hz].
Destaging speed is calculated with
the following formula:
DESTAGE = HIGH
DESTAGE %
100
where n
HIGH
is motor speed high
limit and n
DESTAGE100%
is the value of
destaging threshold.
Seconds
Variable speed
pump
Motor speed
high limit
Destaging
speed
Motor speed
low limit
Fixed speed
pump
Motor speed
low limit
Destaging
speed
Motor speed
high limit
Seconds
Fixed speed
pump
Motor speed
high limit
Destaging
speed
Motor speed
low limit
Seconds
Controlled stop
command
activated
130BA368.10
Illustration 3.86 Destaging Speed
3.23.4 25-5* Alternation Settings
Parameters for dening the conditions for alternation of
the variable-speed pump (lead), if selected as control
strategy.
25-50 Lead Pump Alternation
Option: Function:
NOTICE
If parameter 25-05 Fixed Lead
Pump is set to [1] Yes, it is only
possible to select [0] O.
Lead pump alternation equalizes
the use of pumps by periodically
changing the pump that is speed-
controlled. This ensures that pumps
are equally used over time.
Alternation equalizes the usage of
pumps by always selecting the
pump with the lowest number of
hours run to stage on next.
[0] * O No alternation of lead pump
function takes place. It is not
possible to set this parameter to
options other than [0] O if
parameter 25-02 Motor Start is set
other than [0] Direct on Line.
[1] At staging Alternation of the lead pump
function takes place when staging
another pump.
[2] At command Alternation of the lead pump
function takes place at an external
command signal or a pre-
programmed event. See
parameter 25-51 Alternation Event
for available options.
[3] At staging or
command
Alternation of the variable-speed
(lead) pump takes place at staging
or according to [2] At command.
Parameter Descriptions Programming Guide
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Danfoss vlt FC 102 Specifications

General

Category	DC Drives
Model	Danfoss VLT FC 102
Output voltage range	0 to rated motor voltage
Power range	0.37 kW to 200 kW
Communication interfaces	RS-485
Protection features	Overvoltage, undervoltage, overcurrent, short circuit, earth fault, overtemperature, motor thermal protection
Cooling method	Air-cooled
Enclosure rating	IP20, IP21, IP55 (depending on model)
Approvals	CE, UL, cUL