17
Model BB4000 Controller Instruction Manual
7.5. Fixed Alternation Parameter P.16 = 5
NOTES:
1. This sequence is used when no alternation is required and when
pump 1 should normally be lead pump. Other pumps may be made
lead by setting Parameter P.39.
2. Discrete Inputs programmed as Pump 1-4 Disable inputs may be
used to disable pumps.
3. Discrete inputs programmed as Call Pump 1-4 Last inputs may be
used to assign pumps to standby status.
4. Discrete Inputs programmed as Sequence Inputs 1-4 may be used to
set the lead pump.
5.
Parameter P.39 may be used to set the lead pump.
6. The Pump Stop Mode (Parameter P.17) has no effect on this se-
quence.
7. Automatic Alternation Enable/Disable (Parameter P.18) has no effect
on this sequence.
8. The External Alternation feature will not function when using this
sequence.
9. If connected to a SCADA system, the lead pump position may be set
by writing to Register 40022 (Same as Parameter P.39).
10.
Time Based Alternation using Parameter P.51 will not function when
using this sequence.
7.6. Stepped On/Off Sequence
Only One Pump Runs at a Time Parameter P.16 = 6
NOTES:
1. This sequence is used in stations where there is a significant difference
in the size of the pumps, and when only one pump is to be allowed
to run at a time. When there is a need for more pumping, the smaller
pump is turned off and the next larger pump is called to run. As the
need for pumping decreases, the larger pump is turned off and a
smaller pump is called to run in its place (provided the Off Levels are
staggered).
2. The Lag Pump Delay operates to give the check valve of the pump
being turned off time to close before another pump is called to run.
3. Discrete Inputs programmed as Pump 1-4 Disable Inputs should be
used to disable pumps that are not able to run. It is critical that the
largest pump in the group have some type of pump fault logic con-
nected to the respective Pump Disable discrete input.
4. Discrete Inputs programmed as Call Pump 1-4 Last will not function
when using this sequence.
5.
Discrete Inputs programmed as Sequence Inputs 1-4 will not function
when using this sequence.
6. Parameter P.39 has no effect on this sequence.
7. The Pump Stop Mode (Parameter P.17) has no effect on this sequence.
8. Automatic Alternation Enable/Disable (Parameter P.18) has no effect
on this sequence.
9. The External Alternation feature will not function when using this
sequence.
10.
The On Generator (Parameter P.15) has no effect on this sequence
11.
Time Based Alternation using Parameter P.51 will not function when
using this sequence.