P111 RELAY FUNCTION (continued)
PUMP FUNCTIONS
HYDRO+ relays set for a Pump Function are energized to turn pump controls
"ON" (start pump), and de-energized to turn pump controls "OFF" (stop pump).
Therefore, if HYDRO+ power is interrupted, the pump(s) are turned "OFF".
Pumps are started and stopped at the critical Relay A / B Setpoint
(P112 / P113) levels entered.
To
pump down
(reduce level) set P112 > P113.
To
pump up
(increase level) set P112 < P113
Use "duty assist" Pump Functions if all pumps are to assist each other
(run at the same time, if necessary) to meet demand.
Use "duty backup" Pump Functions if a pump is to take over for another
(stop the previous running pump), failing to meet demand (due to pump
malfunction, intake blockage, etc.).
"Assist" and "Backup" Pump Functions cannot be mixed.
Use "fixed" Pump Functions to have setpoints fixed to the Relay Number
for which they are altered. (Pumps don’t rotate lead and lag).
Use "alternate" Pump Functions to have setpoints sequentially rotated
between pumps (each time all pumps are stopped) for equal pump use.
Use "service ratio" Pump Functions to have setpoints re-assigned to pumps
to meet the Pump Service Ratio (P122) predetermined usage.
Use the "fofo" Pump Function to have setpoints reassigned so the first pump
on is the first pump off, regardless of setpoint entry order.
values: 50 = fixed duty assist
51 = fixed duty backup
52 = alternate duty assist
53 = alternate duty backup
54 = service ratio duty assist
55 = service ratio duty backup
56 = fofo alternate duty assist
PL-507 76
To Next Page
Loading...
