Page 84
SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS
A5E33329501
mmmm
m
Gener
a
l Oper
at
ion
Set Relays to SERVICE RATIO DUTY BACKUP (SRB)
Set the Service Ratio for each pump
Set the ON Setpoints
Set the OFF Setpoints
When a pump start is required (ON Setpoint), the pump with the fewest running hours (with
respect to the assigned ratio values) starts.
Conversely, when a pump stop is required (OFF Setpoint), if multiple pumps are running
simultaneously, the pump with the most running hours (as compared to the assigned ratio
values) stops.
Parameter
Value
Description
SRB
Sets the control algorithm used to trip the
pump relay to SERVICE RATIO DUTY BACKUP.
Only one pump can run at a time. Pump usage
is based on RUN time rather than last used.
Parameter
Sample
Value
Description
2.7.1.10. Service Ratio Pump 1
25
Sets the ratio to: 25% for pump 1, i.e. pump 1
will run 25% of the time.
2.7.1.11. Service Ratio Pump 2
75
Sets the ratio to: 75% for pump 2, i.e pump 2
will run 75% of the time
Parameter
Sample
Value
Description
1.3 m
Sets the level at which the first pump turns on.
1.2 m
Sets the level at which the second pump turns
on.
Parameter
Sample
Value
Description
0.4 m
Sets the level at which the first pump turns off.
0.3 m
Sets the level at which the second pump turns
off.
Notes:
•
The SITRANS LUT400 will not sacrifice other pumping strategies to ensure that
the service ratio is held true
•
If the pump ratios are set to the same value, then the ratio equals 1:1 and all
pumps are used equally (default)
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