5 Operation
5.5 Commissioning with control signal terminals (default settings)
DC1-S…20…, DC1-S…OE1 Variable Frequency Drives
05/21 MN040058EN
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5.5.1 Starting single-phase motors
The speed of single-phase motors is essentially controlled the same way as
on three-phase motors: by adjusting the voltage and frequency.
The only difference is in how single-phase motors start.
While three-phase motors will follow the V/Hz curve from the beginning,
single-phase motors require a start boost.
Once a single-phase motor starts, the speed will be adjusted based on the
V/Hz curve, just like on three-phase motors.
①
Voltage
at desired speed
Voltage
•
The voltage is increased linearly from
V-Boost
(P-11) all the way to the
rated motor operating
voltage
(P-07) .
•
The duration of the starting operation is defined
by
t-Boost
(P-33).
•
After
t-Boost
(P-33) elapses, the voltage goes to
the value required for the desired speed under
consideration of the deceleration ramp set with
t-dec
(P-04).
①
Frequency
at desired speed
Frequency
•
The output frequency is constant during the
entire starting operation and is equal to
f-Boost
(P-32).
•
After
t-Boost
(P-33) elapses, the frequency goes
to the value required for the desired speed under
consideration of the deceleration ramp set with
t-dec
(P-04).
U
P-07
t
①
P-11
P-33
P-04
f
P-32
t
①
P-33
P-04
Summary of Contents for PowerXL
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