Bandwidth Settings - Danfoss VLT Series Operating Instructions Manual

®
VLT Operating Instructions
27-14 Pump Capacity
Range:
100%* [0%(Off) - 800%]
27-16 Runtime Balancing
Option:
[0] * Balanced Priority 1
[1] Balanced Priority 2
[2] Spare Pump
27-17 Motor Starters
Option:
[0] * Direct Online
[1] Soft starters
[2] Star-delta starters
27-18 Spin Time for Unused Pumps
Range:
0 sec* [0 - 99 sec]
27-19 Reset Current Runtime Hours
Option:
[0] * Do not reset
[1] Reset

1.8.4 Bandwidth Settings, 27-2*

Parameters for configuring control response.
27-20 Normal Operating Range
Range:
10%* [1% – P27-21]
Function:
Pump Capacity sets the capacity of each pump in the system relative to the first pump. This is an
indexed parameter with one entry per pump. The capacity of the first pump is always considered
to be 100%.
Function:
Runtime Balancing sets the priority of each pump for balancing it's running hours. The pumps with
the highest priority will be operated before the lower prioritised pumps. If all pumps are set as spare
pump they will be staged and de-staged as no priority is set. It means staged in the order of 1-2-3
and de-staged as 3-2-1.
Possible selections are:
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:
Motor Starters selects the type of mains starters used on the fixed speed pumps. All of the fixed
speed pumps must be configured the same. Possible choices are:
Adds a delay when staging and de-staging corresponding to the soft-starter ramp time, see par.
27-41 and par. 27-42.
Adds a delay at staging, controlled by par. 27-42.
Function:
Spin Time for Unused Pumps sets the length of time to spin unused pumps. If a fixed speed pump
has not been run in the last 72 hours, it will be turned on for this time. This is to prevent damage
caused by leaving the pump off too long. The spin feature may be disabled by setting the value of
this parameter to 0. Warning - Setting this parameter too large may over pressure some systems.
Function:
Reset Current Runtime Hours is used to reset all of the Current Runtime Hours to zero. This time is
used for runtime balancing.
Function:
Normal Operating Range is the allowed offset from the set-point before a pump may be added or
removed. The system must be outside this limit for the time specified in P27-23 (Staging) or P27-24
(De-staging) before a cascade operation takes place. Normal refers to the system operating with at
least one variable speed pump available. This value is entered as a % of Max Reference (See P21-12
in the VLT AQUA Drive Programming Guide
®
MI.38.C3.02 - VLT is a registered Danfoss trademark
1 Extended and Advanced Cascade Controller
for further information).
Option
1
27