Danfoss VLT AQUA Drive FC 202 Programming Manual page 218

Parameter Description
3.22.5 25-8* Status
Readout parameters informing about the operating status
of the cascade controller and the pumps controlled.
25-80 Cascade Status
3 3
Range:
0 [0 - 25 ]
*
25-81 Pump Status
Range: Function:
0 [0 - Pump status shows the status for the number of
*
25 ] pumps selected in parameter 25-06 Number of Pumps.
It is a readout of the status for each of the pumps
showing a string, which consists of pump number
and the status of the pump.
Example: Readout is with the abbreviation like "1:D
2:O" This means that pump 1 is running and speed
controlled by the frequency converter and pump 2 is
stopped.
25-82 Lead Pump
Range:
0 [ 0 - par.
*
25-06 ]
25-83 Relay Status
Array [9]
Range:
0 [0 - 4 ] Readout of the status for each of the relays
*
25-84 Pump ON Time
Array [10]
Range:
0 h [0 -
*
2147483647 h]
216
Function:
Readout of the status of the cascade controller.
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 shows N1.
Function:
assigned to control the pumps. Every element in
the array shows a relay. If a relay is activated, the
corresponding element is set to On. If a relay is
deactivated, the corresponding element is set to
Off.
Function:
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, for example, if the pump is
replaced at a service.
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®
VLT AQUA Drive FC 202
25-85 Relay ON Time
Array [9]
Range:
0 h [0 -
*
2147483647 h]
25-86 Reset Relay Counters
Option:
[0] Do not reset
*
[1] Do reset
3.22.6 25-9* Service
Parameters used if there is a service on 1 or more of the
pumps controlled.
25-90 Pump Interlock
Array [10]
Option: Function:
[0] Off The pump is active for staging/destaging.
*
[1] On
25-91 Manual Alternation
Range:
0 [ 0 - par.
*
25-06 ]
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 parameter 25-84 Pump ON Time is reset.
To use parameter 25-04 Pump Cycling, the
cascade controller is monitoring the relay
ON time.
Function:
Resets all elements in parameter 25-85 Relay
ON Time counters.
In this parameter, it is possible to disable 1 or more of
the fixed lead pumps. For example, the pump is not
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 [130] Pump
1 Interlock – [132] Pump 1 Interlock in parameter group
5-1* Digital In/Out.
The pump interlock command is given. If a pump runs,
it is immediately destaged. If the pump does not run,
it is not allowed to stage on.
Function:
Readout parameter for the actual variable speed
pump in the system. When an alternation takes
place, the lead pump parameter is updated to
reflect the current variable speed pump in the
system. If no lead pump is selected (cascade
controller disabled or all pumps interlocked), the
display shows N1.
MG20OB02