Danfoss VLT AQUA Drive FC 202 Programming Manual page 228

Parameter Description
27-16 Runtime Balancing
Set the priority of each pump for balancing its running hours.
Pumps with the same priority are staged/destaged based on the
running hours.
Option:
3 3
[0] Balanced Priority 1
*
[1] Balanced Priority 2
[2] Spare Pump
27-17 Motor Starters
Option:
[0] Direct
*
Online
[1] Soft
Starter
[2] Star/
Delta
27-18 Spin Time for Unused Pumps
Range:
Size
related 99 s]
*
CAUTION
Ensure that the value in this parameter does not cause
overpressure in the system.
27-19 Reset Current Runtime Hours
Select option [1] Do reset to reset all current run-time hours to 0.
The run-time hours value is used for run-time balancing.
Option:
[0]
*
[1]
226
Function:
Turned on first, turned off last.
Turned on if no priority 1
pumps are available. Turned
off before priority 1 pumps are
turned off.
Turned on last, turned off first.
Function:
Select the type of the mains starter for the fixed
speed pumps. All fixed speed pumps must have
the same starter type.
This option adds a delay when staging and
destaging pumps. The delay is defined in
parameter 27-41 Ramp Down Delay and
parameter 27-42 Ramp Up Delay.
This option adds a delay when staging pumps.
The delay is defined in parameter 27-42 Ramp Up
Delay.
Function:
[ 0 - Enter the time to spin unused pumps. If a
fixed speed pump has not run in the last
72 hours, it is turned on for this time. This
function prevents the damage caused by
leaving the pump off for too long. To
disable the function, set the value of this
parameter to 0.
Function:
Do not reset
Do reset
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®
VLT AQUA Drive FC 202
3.24.6 27-2* Bandwidth Settings
Parameters for configuring the control response.
27-20 Normal Operating Range
Range:
Size
related
*
Illustration 3.97 SBW Staging Delay
Illustration 3.98 SBW Destaging Delay
27-21 Override Limit
Range:
100
% 100 %]
*
Function:
[ 1 - Enter the maximum offset from the setpoint
100 before a pump may be added or removed. The
%] value is a percentage of parameter 21-12 Ext. 1
Maximum Reference. The system must be
outside the normal operating range for the
time specified in parameter 27-23 Staging Delay
or parameter 27-24 Destaging Delay before a
cascade operation takes place. Normal
operation is operation with at least one
variable speed pump available.
(27-24) SBW destage delay
Function:
[ 0 - Enter the maximum offset from the setpoint
before a pump is added or removed immediately
(for instance, if there was a sudden water
demand). The value is the percentage of
parameter 21-12 Ext. 1 Maximum Reference. This
parameter allows responding to sudden changes
in demand without a delay. The override
functionality can be disabled by setting this
parameter to 100%.
SBW
(27-20)
Setpoint
SBW
(27-20)
MG20OB02