P111 RELAY FUNCTION (continued)
CONTROL FUNCTIONS
HYDRO+ relays are energized to turn controls "ON", and de-energized to
turn controls "OFF". Therefore, if HYDRO+ power is interrupted,
the control is "OFF".
FUNCTION DESCRIPTION SETPOINTS
Time relay operation on elapsed time P114, P115
Storm relay operation on storm conditions P150-P152
Aeration timed relay operation if pumps off P114, P115
Penstock timed relay operation based on level P112, P114, P115
Flush Valve timed relay operation on pump cycles P170-P173
Use the "Time Control" Relay Function to activate a device based
upon elapsed time.
e.g. Timed rake control to keep ram lubricated if idle for long periods.
Use the "Storm Control" Relay Function to activate a device based
upon high levels associated with storm conditions.
e.g. Open gate (valve) to divert storm overflow into a holding vessel.
Use the "Aeration Control" Relay Function to activate a device based upon
elapsed time since all pumps have been "OFF".
e.g. Timed fresh air introduction to reduce gas concentration.
Use the "Penstock Control" Relay Function (HYDRO+ relays RL1
and RL2 only) to activate a device for a specific time if level is
outside a specified band.
e.g. Maintain constant level by time step adjusting upstream Penstock
based on downstream head.
Use the "Flush Valve" Relay Function to activate a device for a specific
time based upon pump cycle frequency.
e.g. Re-circulate into wet well periodically to dilute bottom solids.
values: 60 = Time Control
61 = Storm Control
62 = Aeration Control
63 = Penstock Control
64 = Flush Valve
PARAMETERS
PL-507 77
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