Model Number; Operating Modes; Compatible Encoders; Table 2-7 Encoders Compatible With Unidrive Sp - Emerson unidrive sp User Manual

Safety Product Mechanical
Information Information Installation
2.2

Model number

The way in which the model numbers for the Unidrive SP range are
formed is illustrated below.
Unidrive product line
SP: Solutions Platform
Complete inverter drive
SP frame size
Voltage rating
2: 200V to 240V
4: 380V to 480V
5: 500V to 575V
6: 500V to 690V
Configuration
0: Wall mount drive
Current rating step
2.3

Operating modes

The Unidrive SP is designed to operate in any of the following modes:
1. Open loop mode
Open loop vector mode
Fixed V/F mode (V/Hz)
Quadratic V/F mode (V/Hz)
2. RFC mode
3. Closed loop vector
4. Servo
5. Regen
2.3.1 Open loop mode
The drive applies power to the motor at frequencies varied by the user.
The motor speed is a result of the output frequency of the drive and slip
due to the mechanical load. The drive can improve the speed control of
the motor by applying slip compensation. The performance at low speed
depends on whether V/F mode or open loop vector mode is selected.
For further details refer to section 8.1.1 Open loop motor control on
page 137.
Open loop vector mode
The voltage applied to the motor is directly proportional to the frequency
except at low speed where the drive uses motor parameters to apply the
correct voltage to keep the flux constant under varying load conditions.
Typically 100% torque is available down to 1Hz for a 50Hz motor.
Fixed V/F mode
The voltage applied to the motor is directly proportional to the frequency
except at low speed where a voltage boost is provided which is set by
the user. This mode can be used for multi-motor applications.
Typically 100% torque is available down to 4Hz for a 50Hz motor.
Quadratic V/F mode
The voltage applied to the motor is directly proportional to the square of
the frequency except at low speed where a voltage boost is provided
which is set by the user. This mode can be used for running fan or pump
applications with quadratic load characteristics or for multi-motor
applications. This mode is not suitable for applications requiring a high
starting torque.
2.3.2 RFC mode
Rotor flux control provides closed loop control without the need for
position feedback by using current, voltages and key motor parameters
to estimate the motor speed.
18
Electrical Getting Basic
installation Started parameters
SP 6 4 0
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Running SMARTCARD
Optimization
the motor operation
It can eliminate instability traditionally associated with open loop control
such as operating large motors with light loads at low frequencies.
For further details, refer to section 8.1.2 RFC mode on page 139.
2.3.3 Closed loop vector mode
1
For use with induction motors with a feedback device installed.
The drive directly controls the speed of the motor using the feedback
device to ensure the rotor speed is exactly as demanded. Motor flux is
accurately controlled at all times to provide full torque all the way down
to zero speed.
2.3.4 Servo
For use with permanent magnet brushless motors with a feedback
device installed.
The drive directly controls the speed of the motor using the feedback
device to ensure the rotor speed is exactly as demanded. Flux control is
not required because the motor is self excited by the permanent
magnets which form part of the rotor.
Absolute position information is required from the feedback device to
ensure the output voltage is accurately matched to the back EMF of the
motor. Full torque is available all the way down to zero speed.
2.3.5 Regen
For use as a regenerative front end for four quadrant operation.
Regen operation allows bi-directional power flow to and from the AC
supply. This provides far greater efficiency levels in applications which
would otherwise dissipate large amounts of energy in the form of heat in
a braking resistor.
The harmonic content of the input current is negligible due to the
sinusoidal nature of the waveform when compared to a conventional
bridge rectifier or SCR/thyristor front end.
See the Unidrive SP Regen Installation Guide for more information
about operation in this mode.
2.4

Compatible encoders

Table 2-7 Encoders compatible with Unidrive SP

Quadrature incremental encoders with or without
marker pulse
Quadrature incremental encoders with UVW
commutation signals for absolute position for
permanent magnet motors with or without marker pulse
Forward / reverse incremental encoders with or
without marker pulse
Forward / reverse incremental encoders with UVW
commutation signals for absolute position for
permanent magnet motors with or without marker pulse
Frequency and direction incremental encoders with
or without marker pulse
Frequency and direction incremental encoders with
UVW commutation signals for absolute position for
permanent magnet motors with or without marker pulse
Sincos incremental encoders
Heidenhain sincos encoders with Endat comms for
absolute position
Stegmann sincos encoders with Hiperface comms
for absolute position
Sincos encoders with SSI comms for absolute
position
SSI encoders (Gray code or binary)
Endat comms only encoders
UVW commutation only encoders*
* This feedback device provides very low resolution feedback and should
not be used for applications requiring a high level of performance
Onboard Advanced Technical
Diagnostics
PLC parameters Data
Encoder type
Unidrive SP User Guide
UL Listing
Information
Pr 3.38
setting
Ab (0)
Ab.SErvo (3)
Fr (2)
Fr.SErvo (5)
Fd (1)
Fd.SErvo (4)
SC (6)
SC.EndAt (9)
SC.HiPEr (7)
SC.SSI (11)
SSI (10)
EndAt (8)
Ab.SErvo (3)
Issue Number: 13