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:
Function:
[0]
*
Balanced Priority 1
Turned on first, turned off last.
[1]
Balanced Priority 2
Turned on if no priority 1
pumps are available. Turned
off before priority 1 pumps are
turned off.
[2]
Spare Pump
Turned on last, turned off first.
27-17 Motor Starters
Option:
Function:
Select the type of the mains starter for the fixed
speed pumps. All fixed speed pumps must have
the same starter type.
[0]
*
Direct
Online
[1]
Soft
Starter
This option adds a delay when staging and
destaging pumps. The delay is defined in
parameter 27-41 Ramp Down Delay
and
.
[2]
Star/
Delta
This option adds a delay when staging pumps.
The delay is defined in
27-18 Spin Time for Unused Pumps
Range:
Function:
Size
related
*
[ 0 -
99 s]
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.
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:
Function:
[0]
*
Do not reset
[1]
Do reset
3.24.6 27-2* Bandwidth Settings
Parameters for configuring the control response.
27-20 Normal Operating Range
Range:
Function:
Size
related
*
[ 1 -
100
%]
Enter the maximum offset from the setpoint
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
or
parameter 27-24 Destaging Delay
before a
cascade operation takes place. Normal
operation is operation with at least one
variable speed pump available.
Illustration 3.97 SBW Staging Delay
175ZA671.11
(27-24) SBW destage delay
SBW
SBW
Setpoint
(27-20)
(27-20)
Illustration 3.98 SBW Destaging Delay
27-21 Override Limit
Range:
Function:
100
%
*
[ 0 -
100 %]
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%.
Parameter Description
VLT
®
AQUA Drive FC 202
226
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