Danfoss VLT HVAC Series Programming Manual page 273

VLT ® HVAC Drive Programming Guide
25-85 Relay ON Time
Array [2]
Range:
0 h* [0 - 2147483647 h]
25-86 Reset Relay Counters
Option:
[0] * Do not reset
[1] Do reset
3.23.7 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 N/A* [0 - par. 25-06 N/A]
Function:
Readout of the value for Relay ON time. The Cascade Controller has separate counters for the pumps
and for the relays that control the pumps. Pump cycling is always done based on the relay counters,
otherwise it would always use the new pump if a pump is replaced and its value in par.25-84
ON Time is reset. In order to use par.25-04
Relay ON time.
Function:
Resets all elements in par.25-85
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/de-staging.
The pump interlock command is given. If a pump is running, it is immediately de-staged. 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.C6.22 - VLT ® is a registered Danfoss trademark
Pump Cycling the Cascade Controller is monitoring the
Relay ON Time counters.
Pump 1-3 Interlock
[130 – 132] in
3 Parameter Description
Pump
3
par. 5-1*, Digital
3-249