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Vector control without an encoder
Vector control without an encoder is used with induction motors.
In vector control without an encoder, the position of the flux and actual speed must be
determined via the electric motor model. The model is buffered by the incoming currents and
voltages. At low frequencies (approx. 0 Hz), the model cannot determine the speed.
For this reason and due to uncertainties in the model parameters or inaccurate measurements,
the system is switched from closed-loop to open-loop operation in this range.
The switchover is governed by time and frequency conditions (p1755, p1756, and p1758). If
the setpoint frequency at the ramp-function generator input and the actual frequency are below
p1755 x p1756 simultaneously, the system does not wait for the time condition.
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Figure 8-16 Switchover conditions
In open-loop operation, the actual speed value is the same as the setpoint value.
To provide the resulting static or dynamic load torque for suspended loads or acceleration
tasks, modify the following parameters:
● p1610 (constant torque increase)
If p1610 is set to 0%, only the magnetizing current r0331 is impressed. For a value of 100%,
the rated motor current p0305 is impressed.
● p1611 (torque increase)
To ensure that the drive does not stall during acceleration, p1611 can be increased or
acceleration pre-control for the speed controller used. The p1611 increase is also advisable
to ensure that the motor is not subject to thermal overload at low speeds.
Vector control without encoder has the following features in the low frequency range:
● Closed-loop operation up to approx. 1 Hz output frequency
● Start-up in closed-loop operation (directly after drive is energized)
● Passes through low frequency range (0 Hz) in closed-loop operation
Note
In this case, the speed setpoint upstream of the ramp-function generator must be greater
than p1755.
Operation
8.4 Functions
SINAMICS GM150 6SL3815-2LN41-4AA2
168
Operating Instructions 04/2017
Содержание SINAMICS GM150
Страница 2: ...20 04 2017 13 25 V27 00 ...
Страница 16: ...Table of contents SINAMICS GM150 6SL3815 2LN41 4AA2 16 Operating Instructions 04 2017 ...
Страница 18: ...Introduction 1 1 About these instructions SINAMICS GM150 6SL3815 2LN41 4AA2 18 Operating Instructions 04 2017 ...
Страница 72: ...Description 3 6 Description of options SINAMICS GM150 6SL3815 2LN41 4AA2 72 Operating Instructions 04 2017 ...
Страница 192: ...Operation 8 5 Fault and system messages SINAMICS GM150 6SL3815 2LN41 4AA2 192 Operating Instructions 04 2017 ...
Страница 228: ...Spare parts SINAMICS GM150 6SL3815 2LN41 4AA2 228 Operating Instructions 04 2017 ...
Страница 232: ...Service Support SINAMICS GM150 6SL3815 2LN41 4AA2 232 Operating Instructions 04 2017 ...
Страница 256: ...Index SINAMICS GM150 6SL3815 2LN41 4AA2 256 Operating Instructions 04 2017 ...
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