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VLT Automation VT Drive FC322
Programming Guide
2.21.7 25-9* Service
Parameters used in case of service on one or more of the pumps controlled.
25-90 Pump Interlock
Array [2]
Option:
[0] *
Off
[1]
On
25-91 Manual Alternation
Range:
0*
[Application dependant]
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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.20.W1.22 - VLT is a registered Danfoss trademark
2 Parameter Description
Pump 1-3 Interlock
par. 5-1*, Digital
[130 – 132] in
2
253
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