Agitator discrimination, however, slows down the HydroRanger I’s speed of response.
Therefore, if fast response is required, especially when aiming the transducer while in
the run mode, and there is no agitator involved, the discriminator should be turned off.
Note: Agitator discrimination will not work if the blades are stationary
and in the transducer’s beam path.
Relays
General
Five on board multi-purpose relays are provided on each HydroRanger I. Each relay
may be assigned to one out of thirteen functions, except relay 5 which has the added
scanner function for differential level operation. Each relay has a corresponding status
LED which is visible through the front cover. For ease of reference, the functions have
been divided into three groups:
•
alarm: alarm ON = LED ON = relay coil de-energized
•
pump: pump ON = LED ON = relay coil energized
•
miscellaneous: contact closed = LED ON = relay coil energized
Complete programming of each relay requires two steps. Refer to the Relay
Programming Chart at the end of this sub-section.
1. select a relay function.
2. enter relay ON/OFF setpoints for function options 1 - 6 and 8 - 10.
OR set control parameters for function options 7, 11, 12, 13 and 14.
Functions
level: » in high alarm or pump down, the function goes on when
level rises to the ON setpoint and goes off when the level
lowers to the OFF setpoint. In low alarm or pump up, the
function goes on when the level lowers to the ON setpoint
and goes off when the level rises to the OFF setpoint.
in bounds: » the relay will be in alarm if the level is inside the zone be-
tween the setpoints.
out of bounds: » the relay will be in alarm if the level is outside of the zone
between the setpoints.
differential: » the high alarm or pump down function goes on when differ-
ential level increases to the ON setpoint and goes off
when the differential level decreases to OFF setpoint.
The low alarm or pump up function goes on when the dif-
ferential level decreases to the ON setpoint and goes off
when the differential level increases to the OFF setpoint.
PL-399 5 – 5
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