Danfoss VLT FC 100 Series Programming Manual page 221

®
VLT HVAC Drive Programming Guide
25-82 Lead Pump
Option:
0 N/A
25-83 Relay Status
Array [2]
On
Off
25-84 Pump ON Time
Array [2]
*
0 hours [0 – 2147483647 hours]
25-85 Relay ON Time
Array [2]
*
0 hours [0 – 2147483647 hours]
25-86 Reset Relay Counters
Option:
* Do not reset
[0]
[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]
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.
Read out of the status for each of the relays assigned to control the pumps. Every element in the array represents
a relay. If a relay is activated, the corresponding element is set to "On". If a relay is deactivated, the corre-
sponding element is set to "Off".
Readout of the value for Pump ON Time. The Cascade Controller has separate counters for the pumps and for
the relays that control the pumps. Pump ON Time monitors the "operating hours" of each pump. The value of
each Pump ON Time counter can be reset to 0 by writing in the parameter, e.g. if the pump is replaced in case
of service.
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. 25-85, Pump ON Time counter is reset. In
order to use par. 25-04, Pump Cycling, the Cascade Controller is monitoring the Relay ON time.
Function:
par. 25-85, Relay ON Time
Resets all elements in
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
MG.11.C5.02 - VLT ® is a registered Danfoss trademark
3. Parameter Description
counters.
Pump 1-3 Interlock [130 – 132] in par. 5-1*, Digital Inputs
3
.
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