P 116 BOUND ALARM HYSTERISIS
For ‘in bounds’ and ‘out of bounds’
Relay Functions (P111 = 2 and 3
respectively), a hysterisis or dead
band prevents relay chatter due to
material level fluctuations
at the upper or lower setpoint.
Enter hysterisis in % of span or
units of P005. (Factory set at 2%).
The hysterisis value is applied
above and below the upper
and lower bound setpoints.
PUMP SETPOINT MODIFIERS (P121 and P122)
P121 (G) RATE PUMP
Use this feature when more than one relay is set for a "Pump" Relay
Function (P111), to start pumps by rate rather than by level.
During operation, when all pumps are OFF and the level reaches the
Relay A Setpoint, the first pump is turned ON.
If more than one relay (5 max.) is set for a "pump" Relay Function, pumps
will be started in sequence until the level changes at a rate greater than the
corresponding Filling (pump up)/Emptying (pump down) Indicator (P702 /
P703) value, or until all pumps are running (which ever occurs first).
(If the surface is within 5% of Span (P007) from the Relay B Setpoint, and
rate falls below the P702 / P703 value, the pump is held "OFF").
This feature is preset to " on " if Relay Set Up is set for " Wet Well 2 " or
" Reservoir 2 " (P100 = 2 or 4) and " off " for any other Relay Set Up value.
values: 0 = off (pump by level)
1 = on (pump by rate)
P122 PUMP SERVICE RATIO
Use this feature to predetermine pump usage if a "Pump Service Ratio"
Relay Function (P111 = 54 or 55) is selected.
When more than one pump is assigned a Pump Service Ratio value
(in any time units) and a pump start is required (Relay A Setpoint, P112),
the pump with the least running hours (with respect to the assigned ratio
values) is started.
Conversely, when a pump stop is required (Relay B Setpoint (P113),
the pump with the most running hours (as compared to the assigned
ratio values), stops.
values: 0.000 to 9999
P116, hysterisis
e.g. in bounds, lower setpoint
PARAMETERS
PL-507 79
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