Danfoss VLT FC 103 Programming Manual page 157

Parameter Description
25-82 Lead Compressor
Option: Function:
0 N/A Readout parameter for the actual variable speed
compressor in the system. The Lead Compressor
parameter is updated to reflect the current variable
3 3
speed compressor in the system when an alternation
takes place. If no lead compressor is selected (Cascade
Controller disabled or all compressors interlocked) the
display will show NONE.
25-83 Relay Status
Array [2]
On
Off Read out of the status for each of the relays assigned to
control the compressors. 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 Compressor ON Time
Array [2]
0 [0 –
h 2147483647
*
h]
25-85 Relay ON Time
Array [2]
0 [0 –
h 2147483647
*
h]
25-86 Reset Relay Counters
Option:
[0] Do not reset
*
[1] Do reset
156
®
VLT
Readout of the value for Compressor ON
Time. The Cascade Controller has sete
counters for the compressors and for the
relays that control the compressors.
Compressor ON Time monitors the
"operating hours" of each compressor. The
value of each Compressor ON Time counter
can be reset to 0 by writing in the
parameter, e.g. if the compressor is replaced
in case of service.
Readout of the value for Relay ON time. The
Cascade Controller has sete counters for the
compressors and for the relays that control
the compressors. Compressor cycling is
always done based on the relay counters,
otherwise it would always use the new
compressor if a compressor is replaced and
its value in 25-84 Compressor ON Time
counter is reset. In order to use
25-04 Compressor Cycling, the Cascade
Controller is monitoring the Relay ON time.
Function:
Resets all elements in 25-85 Relay ON Time.
MG16H102 - VLT
Refrigeration Drive Programming Guide
3.19.7 25-9* Service
Parameters used in case of service on one or more of the
compressors controlled.
25-90 Compressor Interlock
Array [2]
In this parameter, it is possible to disable one or more
of the fixed lead compressors. For example, the
compressor will not be selected for staging on even if
it is the next compressor in the operation sequence. It
is not possible to disable the lead compressor with the
Compressor Interlock command.
The digital input interlocks are selected as [130 – 132]
Compressor 1-3 Interlock in Digital Inputs, parameter
group 5-1*.
[0] Off The compressor is active for staging/destaging.
*
[1] On The Compressor Interlock command is given. If a
compressor is running it is immediately destaged. If the
compressor is not running it is not allowed to stage on.
25-91 Manual Alternation
Range:
0 [ 0 - par.
*
25-06 ]
®
is a registered Danfoss trademark
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.