Table of Contents
Advertisement
2 Parameter Description
25-51 Alternation Event
Option:
2
[0] *
External
[1]
Alternation Time Interval
[2]
Sleep Mode
[3]
Predefined Time
25-52 Alternation Time Interval
Range:
24 h*
[1 - 999 h]
25-53 Alternation Timer Value
Range:
0*
[0 - 0 ]
25-54 Alternation Predefined Time
Range:
Application
[Application dependant]
dependent*
25-55 Alternate if Load < 50%
Option:
[0]
Disabled
[1] *
Enabled
NB!
Only valid if par. 25-50
250
Remote Site Products - 1-888-532-2706 - www.remotesiteproducts.com
http://www.remotesiteproducts.com/p-20772-Danfoss-131X8135-VLT-Automation-VT-Drive-VFD-FC322-230V-5-HP.aspx
Function:
This parameter is only active if the options
been selected in par. 25-50
nation of lead pump takes place every time the event occurs.
Alternation takes place when a signal is applied to one of the digital inputs on the terminal strip and
this input has been assigned to
Alternation takes place every time par. 25-52
Alternation takes place each time the lead pump goes into sleep mode. par. 20-23
be set to
Sleep Mode
[1] or an external signal applied for this function.
Alternation takes place at a defined time of the day. If par. 25-54
set, the alternation is carried out every day at the specified time. Default time is midnight (00:00
or 12:00AM depending on the time format).
Function:
Alternation Time Interval
If
[1] option in par. 25-51
of the variable speed pump takes place every time the Alternation Time Interval expires (can be
Alternation Timer Value
checked out in par. 25-53
Function:
Readout parameter for the Alternation Time Interval value set in par. 25-52
terval
.
Function:
Function:
If Alternation If Capacity <50% is enabled, the pump alternation can only occurs if the capacity is
equal to or below 50%. The capacity calculation is the ratio of running pumps (including the variable
speed pump) to the total number of available pumps (including variable speed pump, but not those
interlocked).
N RUNNING
Capacity
=
N TOTAL
For the Basic Cascade Controller all pumps are equal size.
The lead pump alternation will take place at any pump capacity.
The lead pump function will be alternated only if the numbers of pumps running are providing less
than 50% of total pump capacity.
Lead Pump Alternation
is different from
MG.20.W1.22 - VLT is a registered Danfoss trademark
VLT Automation VT Drive FC322
At Command
[2] or
At Staging or Command
Lead Pump Alternation
. If an Alternation Event is selected, the alter-
Lead Pump Alternation
[121] in
par. 5-1*, Digital Inputs
Alternation Time Interval
Alternation Predefined Time
Alternation Event
).
× 100 %
Off
[0].
Programming Guide
[3] have
.
, expires.
Setpoint 3
must
, is
, is selected, the alternation
Alternation Time In-
Advertisement
Table of Contents
