DataLoop™ LI23 Loop-Powered Process Meter
Instruction Manual
MN302100 Rev 3
31
Pump Control (
PUMPCTRL
)
The pump control output is used in situations where the relays are used to control pumps. There are two
options available for controlling pumps: on-off (
ON‐OFF
) and pump alternation (
ALTERN
).
ON‐OFF
will turn the relay on at a programmed
on
point and off at a programmed
off
point. Setting the
on
point higher than the
off
point will make the output activate on a high PV value; setting the
on
point lower
than the
off
point will make the output active on a low PV value. The relay will reset automatically.
For pump control applications where two similar pumps are used to control the level of a tank or a well, it
is desirable to have the pumps operate alternately. This prevents excessive wear and overheating of one
pump over the lack of use of the other pump. Pump alternation uses both relays in tandem to alternate
between two similar pumps. The
ALTERN
menu is only available under Output 1 and will automatically set
Output 2 to pump alternation as well. Use the pump
Alternation Time
setting (
ALT.TIME
) to control the al-
ternation based on runtime in addition to level cycles.
On/Off Pump Control (
ON‐OFF
)
When programming a single pump to turn on and off, the
on
and
off
points must be programmed. The
relay will activate at the
on
point and deactivate at the
off
point. On and off delays may optionally be pro-
grammed in order to delay the activation or deactivation of the relay by a certain number of seconds after
reaching either the
on
point or
off
point.
RLY 1
PUMPCTRL
PUMP
ON-OFF
PUMP
DELAY
DELAY
ON
TIME
0000 SEC
DELAY
OFF
TIME
0000 SEC
ON
+00,070.00
ON
GAL
Flashes
Units
OFF
GAL
OFF
+00,060.00
Flashes
Units
