Control Techniques unidrive sp User Manual

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x.00
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Menu 5
Unidrive SP Advanced User Guide 121
Issue Number: 7 www.controltechniques.com
The drive thermal protection scheme (see Pr 5.18 on page 115) reduces the switching frequency automatically when necessary to prevent the drive
from overheating. It is possible to disable this feature by setting this bit parameter to one. If the feature is disabled the drive trips immediately when
the IGBT temperature is too high.
This parameter should be set up to give the pole pitch of a linear motor, i.e. the movement of the motor for one cycle of the drive power output
waveforms, if auto-configuration with a linear EnDat encoder is required.
Pr 5.37 shows the actual switching frequency used by the inverter. The maximum switching frequency is set with parameter 05.18, but this may be
reduced by the drive if automatic switching frequency changes are allowed (Pr 5.35=1). Pr 5.37 also indicates if the sample time for the current
controllers have been reduced to allow for SINCOS encoders with lines per revolution that are not a power of two, or closed-loop vector mode
operation without an encoder.
5.35 Disable auto-switching frequency change
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Default
Open-loop, Closed-loop vector, Servo,
Regen
0
Update rate
Background read
5.36 Motor pole pitch
Drive modes Open-loop, Closed-loop vector, Servo
Coding
BitSP FI DETEVMDPNDRANCNVPTUSRWBUPS
2111
Range Open-loop, Closed-loop vector, Servo 0 to 655.35mm
Default Open-loop, Closed-loop vector, Servo 0.00mm
Second motor
parameter
Open-loop, Closed-loop vector, Servo Pr 21.31
Update rate
Background read
5.37 Actual switching frequency
Drive modes Open-loop, Closed-loop vector, Servo
Coding
BitSP FI DETEVMDPNDRANCNVPTUSRWBUPS
11111
Range Open-loop, Closed-loop vector, Servo 0 to 7
Update rate
Background write
Value String Switching frequency (kHz)
Current controller Sample
time (us)
03 3 167
14 4 125
26 6 83
38 8 125
412 12 83
516 16 125
66 rEd 6 167
7 12 rEd 12 167
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Control Techniques unidrive sp Specifications

General

Brand	Control Techniques
Model	unidrive sp
Category	Controller
Language	English