Menu 3 − Frequency Monitoring and Speed Feedback

Mode: Open‑Loop

The drive controls asynchronous machines in open loop control with respect to frequency and current. The open loop asynchronous control is further broken down into vector and fixed boost modes.

 

 


Parameter03.001  Final Demand Reference
Short descriptionDisplays the final reference to the frequency controller
ModeOpen‑Loop
Minimum−VM_FREQMaximumVM_FREQ
Default UnitsHz
Type32 Bit VolatileUpdate Rate16ms
Display FormatStandardDecimal Places2
CodingRO, FI, VM, ND, NC, PT

Final Demand Reference (03.001) shows the fundamental drive frequency demand from the Post Ramp Reference (02.001) and the Hard Frequency Reference (03.022) (if enabled).


Parameter03.005  Zero Frequency Threshold
Short descriptionDefines the threshold for detecting the zero frequency condition
ModeOpen‑Loop
Minimum0.00Maximum20.00
Default2.00UnitsHz
Type16 Bit User SaveUpdate RateBackground read
Display FormatStandardDecimal Places2
CodingRW, BU

If the Post Ramp Reference (02.001) is at or below the level defined by this parameter in either direction Zero Frequency (10.003) = 1, otherwise Zero Frequency (10.003) = 0.


Parameter03.006  At Frequency Lower Limit
Short descriptionDefines the lower limit for detecting the at frequency condition
ModeOpen‑Loop
Minimum0.00Maximum550.00
Default1.00UnitsHz
Type32 Bit User SaveUpdate RateBackground read
Display FormatStandardDecimal Places2
CodingRW

At Frequency  (10.006) is set if the Post Ramp Reference (02.001) is on the boundaries or within the at speed window. Above Set Frequency  (10.007) and Below Set Frequency (10.005) are set if the reference is above or below the window respectively.

If Absolute At Frequency Select (03.009) = 0 reference window mode is used.
The "at speed" condition is true if,

(|Pre-ramp Reference (01.003)| - At Frequency Lower Limit (03.006)) ≤ |Post Ramp Reference (02.001)| ≤ (|Pre-ramp Reference (01.003)| + At Frequency Upper Limit (03.007))

(If the lower limit is less than zero then zero is used as the lower limit.)

If Absolute At Frequency Select (03.009) = 1 absolute window mode is used.
The "at speed" condition is true if,

At Frequency Lower Limit (03.006) ≤ |Post Ramp Reference (02.001)| ≤ At Frequency Upper Limit (03.007)

Note: All flags are cleared if Reference On (01.011) is 0.


Parameter03.007  At Frequency Upper Limit
Short descriptionDefines the upper limit for detecting the at frequency condition
ModeOpen‑Loop
Minimum0.00Maximum550.00
Default1.00UnitsHz
Type32 Bit User SaveUpdate RateBackground read
Display FormatStandardDecimal Places2
CodingRW

See At Frequency Lower Limit (03.006).


Parameter03.008  Over Frequency Threshold
Short descriptionDefines the threshold used to detect the over frequency condition
ModeOpen‑Loop
Minimum0.00Maximum550.00
Default0.00UnitsHz
Type32 Bit User SaveUpdate RateBackground read
Display FormatStandardDecimal Places2
CodingRW

If Over Frequency Threshold (03.008) is set to a non-zero value it defines the over frequency threshold. If the Post Ramp Reference (02.001) exceeds this threshold in either direction an  Over Speed trip is produced. If Over Frequency Threshold (03.008) is set to 0.00 the threshold is 1.2 times the variable maximum for the references which is normally the value of Maximum Reference Clamp (01.006) or M2 Maximum Speed (21.001), but see VM_SPEED_FREQ_REF[MAX] for a full definition.


Parameter03.009  Absolute At Frequency Select
Short descriptionSet to 1 to select absolute at frequency
ModeOpen‑Loop
Minimum0Maximum1
Default0Units 
Type1 Bit User SaveUpdate RateBackground read
Display FormatStandardDecimal Places0
CodingRW

See At Frequency Lower Limit (03.006).


Parameter03.022  Hard Frequency Reference
Short descriptionDefines the value of the hard frequency reference
ModeOpen‑Loop
Minimum−VM_SPEED_FREQ_REFMaximumVM_SPEED_FREQ_REF
Default0.00UnitsHz
Type32 Bit User SaveUpdate Rate4ms
Display FormatStandardDecimal Places2
CodingRW, VM

The Hard Frequency Reference (03.022) is a reference value which does not pass through the ramp system, but is added directly to the Post Ramp Reference (02.001). The Hard Frequency Reference (03.022) is only added when selected by the Hard Frequency Reference Select (03.023) and Reference On (01.011) is active.


Parameter03.023  Hard Frequency Reference Select
Short descriptionSet to 1 to enable the use of the hard frequency reference
ModeOpen‑Loop
Minimum0Maximum1
Default0Units 
Type1 Bit User SaveUpdate Rate4ms
Display FormatStandardDecimal Places0
CodingRW

See Hard Frequency Reference (03.022).


Parameter03.029  Position
Short descriptionDisplays the position counter in frequency or encoder mode
ModeOpen‑Loop
Minimum0Maximum65535
Default Units 
Type16 Bit Power Down SaveUpdate RateBackground
Display FormatStandardDecimal Places0
CodingRO, FI, ND, NC, PT, BU

Indicates the current value of the position counter in Frequency or Encoder mode. Position is reset to 0 if Position Counter Reset (03.032) is 1.


Parameter03.032  Position Counter Reset
Short descriptionSet to 1 to reset the position counter
ModeOpen‑Loop
Minimum0Maximum1
Default0Units 
Type1 Bit VolatileUpdate RateBackground
Display FormatStandardDecimal Places0
CodingRW, NC

When set, this parameter resets the position parameter (Position (03.029)).


Parameter03.035  Position Scaling Numerator
Short descriptionDefines the numerator used for scaling the pulse counter
ModeOpen‑Loop
Minimum0.000Maximum1.000
Default1.000Units 
Type16 Bit User SaveUpdate RateBackground
Display FormatStandardDecimal Places3
CodingRW, BU

Position Scaling Numerator (03.035) and Position Scaling Denominator (03.036) are used to scale the pulse counter down to the required position units. The multiplying factor applied to the counter is defined as:

Position Scaling Numerator (03.035) ÷ Position Scaling Denominator (03.036)


Parameter03.036  Position Scaling Denominator
Short descriptionDefines the denonminator used for scaling the pulse counter
ModeOpen‑Loop
Minimum0.000Maximum100.000
Default1.000Units 
Type32 Bit User SaveUpdate RateBackground
Display FormatStandardDecimal Places3
CodingRW

See Position Scaling Numerator (03.035).


Parameter03.037  Frequency Output or PWM Output Scaling
Short descriptionDefines the scaling factor applied to the frequency or PWM output
ModeOpen‑Loop
Minimum0.000Maximum4.000
Default1.000Units 
Type16 Bit User SaveUpdate RateBackground
Display FormatStandardDecimal Places3
CodingRW, BU

Scale factor applied to the frequency or PWM output.


Parameter03.038  Maximum Output Frequency
Short descriptionDefines the maximum frequency required at the frequency output
ModeOpen‑Loop
Minimum0Maximum3
Default2UnitskHz
Type8 Bit User SaveUpdate RateBackground
Display FormatStandardDecimal Places0
CodingRW, TE, BU

ValueTextDescription
01Fmax 1kHz
12Fmax 2kHz
25Fmax 5kHz
310Fmax 10kHz

Defines the maximum frequency of the output for both frequency and PWM ouput modes as set by Digital I/O 01 mode (08.031). For frequency mode ( Digital I/O 01 mode (08.031) = 2 ) the choice of maximum output frequency depends on the requirement of the output. Due to limitations in the hardware, higher output frequencies do not offer the best resolution at the top end of the frequency range. The table below indicates the resolution at the programmed maximum frequency:

Fmax (kHz) Resolution at Fmax
1 14 bit
2 13 bit
5 12 bit
10 11 bit


Parameter03.042  Frequency Input High Precision
Short descriptionIncrease the frequency input measuring window
ModeOpen‑Loop
Minimum0Maximum1
Default0Units 
Type1 Bit User SaveUpdate RateBackground
Display FormatStandardDecimal Places0
CodingRW

This bit should be set to 1 if a higher accuracy is required than that defined in Maximum Reference Frequency (03.043). If Frequency Input High Precision (03.042) = 1 then the frequency input measurement window is doubled. This doubles the accuracy of the frequency input measurment but increases the response time by two also.

If Frequency Input High Precision (03.042) = 0 then the frequency input measurement window is similar to Commander SK with better response time.


Parameter03.043  Maximum Reference Frequency
Short descriptionDefines the maximum frequency expected at the frequency input
ModeOpen‑Loop
Minimum0.00Maximum100.00
Default10.00UnitskHz
Type16 Bit User SaveUpdate RateBackground
Display FormatStandardDecimal Places2
CodingRW

Defines the maximum frequency expected at the frequency input. The time the frequency is measured over is defined by

Measurement Time = 2048 / Maximum reference frequency

With a maximum measurement time of 0.341 seconds.
2048 is used to give the measurement more stability. The output is 10 bits.
Maximum reference frequency of less than 6kHz will have a lower resolution.


Parameter03.044  Frequency Reference Scaling
Short descriptionDefines the scaling factor applied to the frequency reference
ModeOpen‑Loop
Minimum0.000Maximum4.000
Default1.000Units 
Type16 Bit User SaveUpdate RateBackground
Display FormatStandardDecimal Places3
CodingRW, BU

Scale factor applied to the frequency reference.


Parameter03.045  Frequency Reference
Short descriptionDisplays the frequency reference
ModeOpen‑Loop
Minimum0.00Maximum100.00
Default Units%
Type16 Bit VolatileUpdate Rate16ms
Display FormatStandardDecimal Places2
CodingRO, FI, ND, NC, PT

Indicates the reference input if Digital input 5 mode (08.035) = 4.

The reference has a 16ms filter.


Parameter03.047  Two Point Minimum Frequency
Short descriptionDefines the minimum frequency for scaling the frequency input
ModeOpen‑Loop
Minimum0.00Maximum100.00
Default0.00Units%
Type16 Bit User SaveUpdate RateBackground read
Display FormatStandardDecimal Places2
CodingRW

Frequency input is converted to percentage of Maximum Reference Frequency (03.043) and is then further limited by the following parameters to generate the frequency input reference Frequency Reference (03.045).


Parameter03.048  Drive Reference at Minimum Frequency
Short descriptionDefines the drive reference for scaling the frequency input at minimum frequency
ModeOpen‑Loop
Minimum0.00Maximum100.00
Default0.00Units%
Type16 Bit User SaveUpdate RateBackground read
Display FormatStandardDecimal Places2
CodingRW

See Two Point Minimum Frequency (03.047).


Parameter03.049  Two Point Maximum Frequency
Short descriptionDefines the maximum frequency for scaling the frequency input
ModeOpen‑Loop
Minimum0.00Maximum100.00
Default100.00Units%
Type16 Bit User SaveUpdate RateBackground read
Display FormatStandardDecimal Places2
CodingRW

See Two Point Minimum Frequency (03.047).


Parameter03.050  Drive Reference at Maximum Frequency
Short descriptionDefines the drive reference for scaling the frequency input at maximum frequency
ModeOpen‑Loop
Minimum0.00Maximum100.00
Default100.00Units%
Type16 Bit User SaveUpdate RateBackground read
Display FormatStandardDecimal Places2
CodingRW

See Two Point Minimum Frequency (03.047).


Parameter03.072  Motor speed percent
Short descriptionDisplays the final demand reference as a percentage of the reference clamp
ModeOpen‑Loop
Minimum-150.0Maximum150.0
Default Units%
Type16 Bit VolatileUpdate RateBackground write
Display FormatStandardDecimal Places1
CodingRO, FI, ND, NC, PT

Motor speed percent (03.072) displays the Final Demand Reference (03.001) as a percentage of the reference clamp for the motor direction running. For forward direction the clamp used is either Maximum Reference Clamp (01.006) or M2 Maximum Speed (21.001). For reverse direction the clamp used is the modulas of  either Maximum Reference Clamp (01.006) or M2 Maximum Speed (21.001) if Negative Reference Clamp Enable (01.008) = 0, or the modulas of either Minimum Reference Clamp (01.007) or M2 Minimum Speed (21.002) if Negative Reference Clamp Enable (01.008) = 1.

Motor speed percent (03.072) = | Final Demand Reference (03.001) | x 100 / Reference Clamp used