Danfoss VLT AQUA Drive FC 202 Programming Guide

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 rst, turned o last.
[1] Balanced Priority 2 Turned on if no priority 1
pumps are available. Turned
o before priority 1 pumps are
turned o.
[2] Spare Pump Turned on last, turned o rst.
27-17 Motor Starters
Option: Function:
Select the type of the mains starter for the xed
speed pumps. All xed 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 dened in
parameter 27-41 Ramp Down Delay and
parameter 27-42 Ramp Up Delay.
[2] Star/
Delta
This option adds a delay when staging pumps.
The delay is dened in parameter 27-42 Ramp Up
Delay.
27-18 Spin Time for Unused Pumps
Range: Function:
Size
related*
[ 0 -
99 s]
Enter the time to spin unused pumps. If a
xed 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 o 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 conguring the control response.
27-20 Normal Operating Range
Range: Function:
Size
related*
[ 1 -
100
%]
Enter the maximum oset 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 specied 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.
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 oset 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 Danfoss A/S © 05/2018 All rights reserved. MG20OB02
33

Danfoss VLT AQUA Drive FC 202 Specifications

General

Brand	Danfoss
Model	VLT AQUA Drive FC 202
Category	DC Drives
Language	English