ABB ACS560, Firmware Manual

Page: 136 / 514

136 Control macros
SPFC enabled pump control timing diagram.
Speed (auxiliary
pump 1)
Expected
Flow Rate/
Pressure
Pump connected directly online through contactor
Time
Time
(2)
(3)
(1)
(4)
Speed (auxiliary
pump 2)
(5)
Auxiliary pump 1 controlled by
drive
Time
Relay
RO2
On
RO3
On
RO3
Off
(6)
(1) 76.30 Start point 1 - Start speed for the auxiliary pump 2.
(2) 76.55 Start delay - Delay time to start auxiliary pump 2. The pump is
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 - Time used to compensate the time needed to
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 - Stop speed for the auxiliary pump 2.
(5) 76.56 Stop delay - Delay time to turn off the auxiliary pump 2 when the
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 - Time is used to compensate the time needed
to accelerate the auxiliary pump 1 to a speed where it produces flow.
( Demand - represented by the pro-
cess PID reference)