Control Techniques Digitax ST Advanced User's Manual page 46

Parameter
Menu 3
structure
3.08 Overspeed threshold
Bit SP
Coding
Range 0 to 40,0000 rpm
Default 0
Update rate Background read
If the speed feedback (Pr 3.02) exceeds this level in either direction an overspeed trip is produced. If this parameter is set to zero the overspeed
threshold is automatically set to 1.2 x SPEED_FREQ_MAX.
The motor speed and the motor voltage can be monitored to detect that the motor is accelerating in an uncontrolled way because the motor phasing
angle has not been set up correctly in Pr 3.25 (Pr 21.20 if motor map 2 is selected). If the overspeed threshold is set to zero phasing angle error
monitoring is enabled. If the overspeed threshold is set to any other value this feature is disabled.
3.09 Absolute "at speed" detect
Bit SP
Coding
1
Default 0
Update rate Background read
See Pr 3.06 and Pr 3.07 on page 45.
3.10 Speed controller proportional gain (Kp1)
3.13 Speed controller proportional gain (Kp2)
Bit SP
Coding
Range
0.0000 to 6.5535 (1/ rad s
Default 0.0100
Second motor
Pr 21.17
parameter
Update rate Background read
Speed controller integral gain (Ki1)
3.11
Speed controller integral gain (Ki2)
3.14
Bit SP
Coding
Range
0.00 to 655.35 s/rad s
Default 1.00
Second motor
Pr 21.18
parameter
Update rate Background read
Speed controller differential feedback gain (Kd1)
3.12
Speed controller differential feedback gain (Kd2)
3.15
Bit SP
Coding
Range
0.00000 to 0.65535 s
Default 0.00000
Second motor
Pr 21.19
parameter
Update rate Background read
46
Keypad and
Parameter x.00
display
FI DE Txt VM DP ND RA NC NV
FI DE Txt VM DP ND RA NC NV
FI DE Txt VM DP ND
4
-1
)
FI DE Txt VM DP ND
2
-1
FI DE Txt VM DP ND
5
-1 -1
/rad s
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Parameter Advanced parameter
description format descriptions
PT US RW BU
1 1
PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
Serial comms Electronic
protocol nameplate
PS
1
PS
PS
1
PS
1
PS
1
Digitax ST Advanced User Guide
Issue Number: 1
Performance