ABB ACS310 User Manual page 156

156 Program features
motors. The main difference between traditional PFC and SPFC is the way SPFC
connects auxiliary motors on-line.
SPFC connects auxiliary motors online with a flying start, while the motor is still
coasting. Thus, in some cases SPFC makes it possible to soften the start-up current
while connecting auxiliary motors on-line. This is why lower pressure peaks on the
pipelines and pumps may also be achieved. Connection sequence and powering
routine of auxiliary motors in SPFC is explained more detailed in the diagram. The
motor stopping routine follows always the normal PFC routine.
SPFC powering routine
The diagram below illustrates the SPFC powering routine.
f
out
8109 START
FREQ 1
Start
RO 1 / Motor 1
RO 2 / Motor 2
1. At start, relay RO 1 is closed and motor 1 is connected to the drive output.
2. The drive waits for the time specified by parameter
ensure that the contactor (RO 1) has stabilized and then starts modulating from
zero speed. Motor 1 is the speed regulated motor.
3. When the drive output frequency f
FREQ 1), the start delay for the auxiliary motor
4. When delay 8115
(motor 1 is disconnected from the drive output).
5. The drive waits for
has stabilized.
6. After delay, 8122
the new speed regulated motor.
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Motor 1 is speed reg. motor
1
2
8122 PFC START DELAY
has elapsed, the drive coasts to stop and relay RO 1 is opened
8122 PFC START DELAY
RO 2 is closed and motor 2 is connected to the drive output as
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3 4
Motor 2 is speed reg. motor
6
Motor 1 is aux. motor
5 7
8
8122 PFC START DELAY
8122 PFC START DELAY
8115 AUX MOT START D
8122 PFC START DELAY
rises over the start frequency
out
(8115 AUX MOT START
to ensure that the contactor (RO 1)
Industry Automation
t
to
(8109 START
D) is set.
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