Danfoss VLT Programming Manual page 177

Parameter Description
3.23.5 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 - 0 ] Read out of the status of the Cascade Controller.
*
25-81 Pump Status
Range: Function:
0 [0 - 0 ] Pump Status shows the status for the number of
*
pumps selected in 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
current 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 [2]
Range:
0 [0 - 0 ] Read out of the status for each of the relays assigned
*
25-84 Pump ON Time
Array [2]
Range:
0 h [0 - 2147483647
*
h]
176
Function:
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.
Function:
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 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, e.g. if the pump is replaced in
case of service.
MG.11.CB.02 - VLT
®
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
3.23.6 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 The pump is active for staging/destaging.
*
[1] On The Pump Interlock command is given. If a pump is
25-91 Manual Alternation
Range:
0 [0 - par.
*
25-06 ]
®
is a registered Danfoss trademark
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
25-84 Pump ON Time is reset. In order to use
25-04 Pump Cycling the Cascade Controller
is monitoring the Relay ON time.
Function:
Resets all elements in 25-85 Relay ON Time
counters.
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 Pump 1-3
Interlock [130 – 132] in par. 5-1*, Digital Inputs.
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.