Pump Interlock; Manual Alternation; Main Menu - Analog I/O Option Mcb 109 - Group - Danfoss VLT Programming Manual

®
VLT HVAC Drive Programming Guide

25-90 Pump Interlock

Array [2]
Option:
[0] * Off
[1] On

25-91 Manual Alternation

Range:
0 N/A* [Application dependant]

3.24 Main Menu - Analog I/O Option MCB 109 - Group 26

3.24.1 26-**, Analog I/O Option MCB 109
The Analog I/O Option MCB 109 extends the functionality of VLT HVAC Drive frequency converters, by adding a number of additional, programmable
analog inputs and outputs. This could be especially useful in Building Management System installations where the frequency converter may be used as
de-central I/O, obviating the need for an outstation and thus reducing cost.
Consider the diagram:
Function:
In this parameter, it is possible to disable one or more of the fixed lead pumps. For example, the
pump will not be selected for staging on even if it is the next pump in the operation sequence. It is
not possible to disable the lead pump with the Pump Interlock command.
The digital input interlocks are selected as
Inputs
.
The pump is active for staging/destaging.
The Pump Interlock command is given. If a pump is running it is immediately destaged. If the pump
is not running it is not allowed to stage on.
Function:
Readout parameter for the actual variable speed pump in the system. The Lead Pump parameter is
updated to reflect the current variable speed pump in the system when an alternation takes place.
If no lead pump is selected (Cascade Controller disabled or all pumps interlocked) the display will
show NONE.
MG.11.C9.02 - VLT ® is a registered Danfoss trademark
3 Parameter Description
Pump 1-3 Interlock
[130 – 132] in
par. 5-1*, Digital
3
253