25-81 Compressor Status
Option:
Function:
Compressor Status shows the status for the
number of compressors selected in
25-06 Number of Pumps
. It is a readout of the
status for each of the compressors showing a
string, which consists of compressor number
and the current status of the compressor.
Example: Readout is with the abbreviation like
“1:D 2:O” This means that compressor 1 is
running and speed controlled by the
frequency converter and compressor 2 is
stopped.
[X] Disabled
The compressor is interlocked either via
25-90 Pump Interlock
, or signal on a digital
input programmed for Compressor (number
on compressor) Interlock in parameter group
5-1* Digital Inputs
. Can only refer to fixed
speed compressors.
[O] Off
Stopped by the cascade controller (but not
interlocked).
[D] Running on
Frequency
Converter
Variable speed compressor, regardless if
connected directly or controlled via relay in
the frequency converter.
[R] Running on
Mains
Running on mains. Fixed speed compressor
running.
25-82 Lead Compressor
Option:
Function:
0 N/A Readout parameter for the actual variable speed
compressor in the system. It is updated to reflect the
current variable 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
h
*
[0 –
2147483647
h]
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.
25-85 Relay ON Time
Array [2]
0
h
*
[0 –
2147483647
h]
Readout of the value for Relay ON time. The
Cascade Controller has set 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 Pump ON Time
counter is
reset. In order to use
25-04 Pump Cycling
, the
Cascade Controller is monitoring the Relay
ON time.
25-86 Reset Relay Counters
Option:
Function:
[0]
*
Do not reset
[1]
Do reset
Resets all elements in
25-85 Relay ON Time
.
6.14.6 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 parameter group
5-1* Digital
Inputs
.
[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
Option:
Function:
[0]
*
0 = Off -
Number of
Compressors
This parameter is only active if the options
At Command
or
At Stating or Command
are
selected in
25-50 Lead Compressor
Alternation
.
The parameter is for manually setting of
what compressor to be assigned as
variable speed compressor. The default
value of Manual Alternation is
[0] Off
. If a
Parameter Descriptions
Operating Instructions VLT
®
CDS302 and CDS303
116
MG34M302 - VLT
®
is a registered Danfoss trademark/Commercial Compressor
6
6
