CG Drives & Automation 01-7492-01r1 Functional description 139
Change Condition [394]
This parameter determines the criteria for changing the
master. This menu only appears if Alternating MASTER
operation is selected. The elapsed run time of each drive is
monitored. The elapsed run time always determines which
drive will be the 'new' master drive.
This function is only active if the parameter “Select Drive
[393]”= “All” is used.
Change Timer [395]
When the time set here is elapsed, the master drive will be
changed. This function is only active if “Select Drive
[393]”=All and “Change Cond [393]”= Timer/ Both.
Drives on Change [396]
If a master drive is changed according to the timer function
(Change Condition=Timer/Both [394]), it is possible to
leave additional pumps running during the change
operation. With this function the change operation will be
as smooth as possible. The maximum number to be
programmed in this menu depends on the number of
additional drives.
Example
If the number of drives is set to 6, the maximum value will
be 4. This function is only active if “Select Drive [393]”=All.
Upper Band [397]
If the speed of the master drive comes into the upper band,
an additional drive will be added after a delay time that is set
in “Start delay [399]”.
Example
Max Speed = 1500 rpm
Min Speed = 300 rpm
Upper Band = 10%
Start delay will be activated:
Range = Max Speed to Min Speed = 1500–300 = 1200 rpm
10% of 1200 rpm = 120 rpm
Start level = 1500–120 = 1380 rpm
394 Change Cond
Default: Both
Stop 0
The Runtime of the master drive
determines when a master drive has to be
changed. The change will only take place
after a:
- Power Up
- Stop
- Standby condition
- Trip condition.
Timer 1
The master drive will be changed if the
timer setting in Change Timer [395] has
elapsed. The change will take place
immediately. So during operation the
additional pumps will be stopped
temporarily, the 'new' master will be
selected according to the Run Time and
the additional pumps will be started again.
It is possible to leave 2 pumps running
during the change operation. This can be
set with Drives on Change [396]
.
Both 2
The master drive will be changed if the
timer setting in Change Timer [395] has
elapsed. The 'new' master will be selected
according to the elapsed Run Time. The
change will only take place after a:
- Power Up
- Stop
- Standby condition.
- Trip condition.
NOTE: If the Status feedback inputs (DigIn 9 to Digin
14) are used, the master drive will be changed
immediately if the feedback generates an 'Error'.
395 Change Timer
Default: 50 h
Range: 1-3000 h
396 Drives on Ch
Default: 0
Range: 0 to (the number of drives - 2)
397 Upper Band
Default: 10%
Range: 0-100% of total min speed to max speed
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