15
6
Idle Speed adjustment
Water Ring Vacuum Pumps.
Start up the varivac in “AUTO” and get the plant up to vacuum with the selector in
“Milk” and then open one cluster.
Close the cluster and listen to the pump, the vacuum level may rise slightly at this point,
this is normal. If the pump hunts, go to parameter #203 and raise the setting until the
pump just stops hunting (the water ring is collapsing causing this effect).
If the pump does not hunt but the vacuum rises significantly, lower this setting to just
above the seal collapse position. This setting will need to be changed for “wash” also.
If the system is a two pump & motor set up (twin), this setting will also need to be
changed in Setup #2 PLUS parameter #225 will need setting at 2.5Hz above this setting.
Maximum speed is set at 55 Hz; by opening clusters until the top speed is reached (this
can be seen on the top of the screen by pressing the “Display” button). The speed can be
raised until the kilowatt reading is approximately 15% above the nameplate rating. If
doing this with a two pump & motor set up, parameter #226 in Setup #1 will need to be
set to 2.5Hz below the new maximum setting.
Blower and Oil vane Vacuum Pumps.
Start up the varivac in “AUTO” and get the plant up to vacuum with the selector in
“Milk” the vacuum level may rise slightly at this point if so lower the minimum speed of
the pump using parameter #201 to return to the normal milking level normal milking
level parameter #439 will have. This setting will need to be changed for “wash” also.
If the vacuum seems to be about right when it is running in auto adjust
If the system is a two pump & motor set up (twin), this setting will also need to be
changed in Setup #2
PLUS
parameter #225 will need setting at 2.5Hz above this setting.
Maximum speed is set at 55 Hz, by opening clusters until the top speed is reached (this
can be seen on the top of the screen by pressing the “Display” button). The speed can be
raised until the kilowatt reading is approximately 15% above the nameplate rating. If
doing this with a two pump & motor set up, parameter #226 in Setup #1 will need to be
set to 2.5Hz below the new maximum setting.
High speed or high performance types of vacuum pumps may clatter when running at low
speeds when all of the clusters are closed off this is normal and will go away when the
cups are placed on the cows.
This is caused by the vanes of the pump dropping as there is not enough centrifugal force
to spin them out this happens because the pump has such a huge vacuum over capacity in
the plant (over spec pump for plant). This can be over come by increasing the minimum
speed of the pump such that it minimizes the clatter and doesn’t increase the vacuum too
much at idle.
