ULTRATWIN (UL)
INSTRUCTION MANUAL
70
Example 2 Reservoir Control (pump Up)
A sump is typically used to temporarily hold water or effluent, and when the
level reaches a specific point, the sump is pumped down, with the fluid
being transferred to another process.
The application is to be assigned to Point 2 (Transducer 2)
In this example, there are two pumps, which will be set to alternate duty
assist, so they come on alternately. Pump 1 is to be set to relay 2, pump 2 to
relay 3, and the low-level alarm to relay 1. This will operate as follows:
During normal operation,
pump 1
will come on at 7.0 feet and pump up to
8.0 feet. The setpoints are then shifted to
pump 2
, which will come on
first
next time
. During peak periods, when
pump 1
cannot cope,
pump 1
will
come on at 7.0 feet and
pump 2
will come on at 5.0 feet and pump up to
8.0 feet. The setpoints are then shifted to
pump 2
, which will come on
first
next time
. If both pumps cannot cope, and the level falls to 1.0 feet, then
the alarm relay (relay 3) will come on and go off when the level rises to 1.5
feet. This will indicate insufficient capacity of the pumps.
50%. Pump 2 on (P233), 5.0 feet
0% - Empty level
80%. Pump 1&2 off (P224, P234), 8.0 feet
10% - Low alarm on (P213), 1.0 feet
Empty distance (P105), 11.0 feet
70%. Pump 1 on (P223), 7.0 feet
100%. Span (P106), 10.0 feet
15%. Low alarm off (214), 1.5 feet
