ABB ACS560 Firmware Manual page 136

136 Control macros
SPFC enabled pump control timing diagram.
(Demand - represented by the pro-
Expected
Flow Rate/ cess PID reference)
Pressure
Speed (auxiliary
pump 1)
Auxiliary pump 1 controlled by
drive
Speed (auxiliary
pump 2)
RO2
On
(1) 76.30 Start point 1
(2) 76.55 Start delay
started only when the speed of the auxiliary pump 1 is higher or same as the
start speed (76.30) for the duration mentioned in this parameter.
(3) 76.57 PFC speed hold on
accelerate the auxiliary pump 2 to a speed where it produces flow. For
duration mentioned in the parameter, the auxiliary pump 1 maintains its
speed momentum.
(4) 76.41 Stop point 1
(5) 76.56 Stop delay
speed of the auxiliary pump 1 is lower or same as the stop speed (76.41) for
the duration mentioned in this parameter.
(6) 76.58 PFC speed hold off
to accelerate the auxiliary pump 1 to a speed where it produces flow.
(1)
(2)
(3)
Pump connected directly online through contactor
RO3
On
- Start speed for the auxiliary pump 2.
- Delay time to start auxiliary pump 2. The pump is
- Time used to compensate the time needed to
- Stop speed for the auxiliary pump 2.
- Delay time to turn off the auxiliary pump 2 when the
- Time is used to compensate the time needed
(4)
(6)
(5)
RO3
Off
Time
Time
Time
Relay