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Pump Stop Mode - Parameter P.17
This Parameter establishes which pump is the next one to be stopped, when there are two or more pumps on.
The Controller has a corresponding “Pump Off Level” setting for each of the “Pump On Level” settings. For the
“Pump Stop Mode” feature to operate, the “Pump Off Level” settings must be set on different levels. If all the
“Pump Off Level” settings are set on the same level it does not matter what Parameter P.17 is set on.
First On Last Off - In this mode, as the level reaches one of the “Pump Off Level” settings, the pump that was
most recently turned on is turned off, leaving the one that was call to run first still running.
First On First Off - In this mode, as the level reaches one of the “Pump Off Level” settings, the pump that was
most recently turned on is left on and the pump that has been on the longest is turned off. This results in a longer
cool down period for each pump between starts. This mode works the best in stations where one pump is required
to run for a long period of time, with an occasional need for an additional pump.
Automatic Alternation - Parameter P.18
This Parameter is provided so that normal automatic alternation may be disabled (turned off). Typically, normal
alternation is disabled only in applications that have an external Time Clock used to alternated the pumps.
(The Time Clock would be connected to a Discrete Input programmed for “External Alternation” , Function 6.)
Parameter
Default
Value Setting Definitions
P.17
2 Pump Stop Mode 1 = First On Last Off 2 = First On First Off
Parameter
Default
Value Setting Definitions
P.18
1 Automatic Alternation 1 = Enabled 2 = Disabled
Forced Lead Pump Position - Parameter P.39
This Parameter is provided so that a fixed sequence may be established with the selected pump always as lead.
For example setting Parameter P.39 on 1 will cause a fixed pump call sequence of 1-2-3-4. Parameter P.39
may also be changed by writing a 0,1,2,3 or 4 to SCADA Register 40022.
Parameter
Default
Value Setting Definitions
P.39
0
Forced Lead Pump Position SCADA Register 40022
0 = Normal Alternation 1(2,3,4) = Pump 1(2,3,4) as Lead
Time Based Alternation - Parameter P.51
This feature may be used to ensure that alternation periodically occurs even in applications that tend to run one
pump for a long period of time. The internal Time Clock starts and runs whenever at least one pump is called to
run. When it times out, it forces the alternation of the pumps and then resets the Time Clock. The Time Clock is
also reset each time a Normal Alternation Occurs.
Parameter
Default
Value Setting Definitions
P.51
0
Time Based Alternation Time Clock Range: 1 - 255 1/6 hour
0 = Disabled 1 = 1/6 hour 6 = 1 hour 48 = 8 hours 144 = 24 hours
PUMP CALL SEQUENCE - Setup Parameters
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