5.4.5.4 Selecting the control mode
Suitable applications and typical control properties
U/f control or FCC (ux current con‐
trol) without an encoder
Vector control without an en‐
coder
Vector control with encoder
Application
examples
• Horizontal conveyor technology
(conveyor belts, roller conveyors,
chain conveyors)
• Pumps, fans, and compressors with
ow characteristic
• Horizontal conveyor technolo‐
gy (conveyor belts, roller con‐
veyors, chain conveyors)
• Extruder
• Centrifuges
• Pumps and compressors with
displacement machines
• Vertical conveyor technology
(conveyor belts, roller con‐
veyors, chain conveyors)
• Lifters/Lowerers
• Stacker cranes
Motors that
can be oper‐
ated
Induction motors Induction motors
Encoderless 1FK7 synchronous
motors
Reluctance motors
Induction motors
The rated current of the motor must lie in the range of 13 % … 100 % of the rated current of the converter.
Properties
of closed-
loop motor
control
• Responds to speed changes with a
typical settling time of
100 ms … 200 ms
• Responds to load surges with a typ‐
ical settling time of 500 ms
6SHHG
/RDG
0RWRU
WRUTXH
W
W
W
PV
• U/f and FCC are suitable for the fol‐
lowing cases:
– For power-up times 0 → rated
speed > 2 s
– For applications with increasing
load torque without load impul‐
ses
• The closed-loop control is insensi‐
tive to inaccurate motor data set‐
tings, e.g. the motor temperature
• The vector control responds to speed changes with a typical set‐
tling time of < 100 ms.
• The vector control responds to load impulses with a typical set‐
tling time of 200 ms.
6SHHG
/RDG
0RWRU
WRUTXH
W
W
PV
• The vector control is required in the following cases:
– For power-up times 0 → rated speed < 2 s
– For applications with fast and high load impulses
• Typically achieves a torque ac‐
curacy of ± 5 % for 15 % …
100 % of the rated speed
• Extends the torque accuracy
of ± 5 % to speeds < 15 % of
the rated speed.
Max. output
frequency
550 Hz 240 Hz
Torque con‐
trol
Closed-loop torque control not possible Torque control for speeds > 15 %
of the rated speed
Torque control from speeds = 0.
Commissioning
5.4 Quick commissioning
Distributed converter for SIMOGEAR geared motors
Operating Instructions, 10/2020, FW V4.7 SP13, A5E31298649B AL 127
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