Selecting The Control Mode - Siemens SINAMICS G110M Operating Instructions Manual

5.4.5.4

Selecting the control mode

Suitable applications and typical control properties
U/f control or FCC (flux current con‐
trol) without an encoder
Application
• Horizontal conveyor technology
examples
(conveyor belts, roller conveyors,
chain conveyors)
• Pumps, fans, and compressors with
flow characteristic
Motors that
can be oper‐
ated
The rated current of the motor must lie in the range of 13 % ... 100 % of the rated current of the converter.
Properties
• Responds to speed changes with a
of closed-
typical settling time of
loop motor
100 ms ... 200 ms
control
• Responds to load surges with a typ‐
ical settling time of 500 ms
• 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
Max. output
frequency
Torque con‐ Closed-loop torque control not possible Torque control for speeds > 15 %
trol
Distributed converter for SIMOGEAR geared motors
Operating Instructions, 10/2020, FW V4.7 SP13, A5E31298649B AL
Induction motors
550 Hz
Vector control without an en‐
coder
• Horizontal conveyor technolo‐
gy (conveyor belts, roller con‐
veyors, chain conveyors)
• Extruder
• Centrifuges
• Pumps and compressors with
displacement machines
Induction motors
Encoderless 1FK7 synchronous
motors
Reluctance motors
• 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.
• 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
of the rated speed
Commissioning
5.4 Quick commissioning
Vector control with encoder
• Vertical conveyor technology
(conveyor belts, roller con‐
veyors, chain conveyors)
• Lifters/Lowerers
• Stacker cranes
Induction motors
• Extends the torque accuracy
of ± 5 % to speeds < 15 % of
the rated speed.
240 Hz
Torque control from speeds = 0.
127