Danfoss VLT Series Programming Manual page 186

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
Range: Function:
0 [0 - 0 ] Read out of the status of the Cascade Controller.
*
25-81 Pump Status
Range: Function:
0 [0 - Pump Status shows the status for the number of
*
0 ] 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: Function:
0 [ 0 - par. Readout parameter for the actual variable
*
25-06 ] 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.
25-83 Relay Status
Array [2]
Range: Function:
0 [0 - 0 ] 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 corresponding element is set to
"Off".
25-84 Pump ON Time
Array [2]
Range: Function:
0 h [0 - Readout of the value for Pump ON Time.
*
2147483647 h] 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.
®
VLT HVAC Drive Programming Guide
25-85 Relay ON Time
Array [2]
Range:
0 h
25-86 Reset Relay Counters
Option:
[0]
[1]
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]
[1]
25-91 Manual Alternation
Range:
0
®
MG.11.CC.02 - VLT is a registered Danfoss trademark
Function:
[0 - Readout of the value for Relay ON time.
*
2147483647 h] 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.
Do not reset
*
Do reset
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 parameter group 5-1*, Digital
Inputs.
Off The pump is active for staging/destaging.
*
On 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:
[ 0 - par. Readout parameter for the actual variable
*
25-06 ] 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.
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