I have two pumps that are on VFD's, supplying water. Each runs with identical speed setpoints up to 50%. Above 50% the lead pump will take on the extra load.
should I run these two pumps off of one PID loop and clamp the lag pump to 50% or run off of two PID loops with the lag PID loop clamped at 50%...
as far as the lead lag alternation...should I do that on time or alternate on exceeding 50% on the lead and then returning (which would then switch the lead pump to lag)
should I run these two pumps off of one PID loop and clamp the lag pump to 50% or run off of two PID loops with the lag PID loop clamped at 50%...
as far as the lead lag alternation...should I do that on time or alternate on exceeding 50% on the lead and then returning (which would then switch the lead pump to lag)