Control Techniques Digitax ST - Page 46

Menu 3
Parameter
structure
Keypad and
display
Parameter x.00
Parameter
description format
Advanced parameter
descriptions
Serial comms
protocol
Electronic
nameplate
Performance
46 Digitax ST Advanced User Guide
www.controltechniques.com Issue Number: 1
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.
See Pr 3.06 and Pr 3.07 on page 45.
3.08 Overspeed threshold
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range 0 to 40,0000 rpm
Default 0
Update rate Background read
3.09 Absolute “at speed” detect
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Default 0
Update rate Background read
3.10
Speed controller proportional gain (Kp1)
3.13
Speed controller proportional gain (Kp2)
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
4 111
Range
0.0000 to 6.5535 (1/ rad s
-1
)
Default 0.0100
Second motor
parameter
Pr 21.17
Update rate Background read
3.11
Speed controller integral gain (Ki1)
3.14
Speed controller integral gain (Ki2)
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
2 111
Range
0.00 to 655.35 s/rad s
-1
Default 1.00
Second motor
parameter
Pr 21.18
Update rate Background read
3.12
Speed controller differential feedback gain (Kd1)
3.15
Speed controller differential feedback gain (Kd2)
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
5 111
Range
0.00000 to 0.65535 s
-1
/rad s
-1
Default 0.00000
Second motor
parameter
Pr 21.19
Update rate Background read