Pump Alternation - Grundfos SLC Series Installation And Operating Instructions Manual

9.8 Pump alternation

9.8.1 DLC models
DLC pump control panels support four different modes of operation relating to the pump alternation which are based on selected
parameter settings. Additionally, the panel can be set to alternate pumps in the event of a failure.
See section9.9 Adjustable parameters
• Parameters "Pmp1Lead" and "Pmp2Lead" are set to "Off".
Alternating (default) • The (duty) and lag (standby) pumps will alternate for each cycle.
• This mode provides equal wear on both pumps and is recommended for most applications.
• Parameter "Pmp1Lead" is set to "On" and parameter "Pmp2Lead" is set to "Off".
• The lead (duty) pump function is locked to pump 1 and the lag (standby) pump function is locked to
Pump 1 Lead
• No alternation will occur.
• Pump 1 will be the primary pump for the system.
• Pump 2 will only be used during high-flow conditions.
• Parameter "Pmp1Lead" is set to "Off" and parameter "Pmp2Lead" is set to "On".
• The lead (duty) pump function is locked to pump 2 and the lag (standby) pump function is locked to
Pump 2 Lead
• No alternation will occur.
• Pump 2 will be the primary pump for the system.
• Pump 1 will only be used during high flow conditions.
Both Pumps • Parameters "Pmp1Lead" and "Pmp2Lead" are set to "On". Both pumps will run in every cycle.
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for information on how to adjust these parameters.
pump 2.
pump 1.