# Menu 3 − Frequency Monitoring and Speed Feedback

The drive can operate under Open Loop and RFC modes with respect to frequency and current control and can drive asynchronous machines. The open loop asynchronous control is further broken down into vector and fixed boost modes

Parameter | 03.001 Final Demand Reference
--- | ---
Short description | Displays the final reference to the frequency controller
Minimum | −VM_FREQ | Maximum | VM_FREQ
Default |  | Units | Hz
Type | 32 Bit Volatile | Update Rate | 16ms
Display Format | Standard | Decimal Places | 2
Coding | RO, FI, VM, ND, NC, PT

Open loop mode:
Final Demand Reference (03.001) shows the fundamental drive output frequency from the Post Ramp Reference (02.001) and the Hard Frequency Reference (03.022).

RFC modes:
Final Demand Reference (03.001) shows the reference at the input to the frequency controller, which is the sum of the Post Ramp Reference (02.001) if the ramp output is not disabled and the hard frequency reference (if enabled). If the drive is disabled Final Demand Reference (03.001) shows 0.00.

Parameter | 03.005 Zero Frequency Threshold
--- | ---
Short description | Defines the threshold for detecting the zero frequency condition
Minimum | 0.00 | Maximum | 20.00
Default | 2.00 | Units | Hz
Type | 16 Bit User Save | Update Rate | Background read
Display Format | Standard | Decimal Places | 2
Coding | RW, 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.

Parameter | 03.006 At Frequency Lower Limit
--- | ---
Short description | Defines the lower limit for detecting the at frequency condition
Minimum | 0.00 | Maximum | 550.00
Default | 1.00 | Units | Hz
Type | 32 Bit User Save | Update Rate | Background read
Display Format | Standard | Decimal Places | 2
Coding | RW

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.

Parameter | 03.007 At Frequency Upper Limit
--- | ---
Short description | Defines the upper limit for detecting the at frequency condition
Minimum | 0.00 | Maximum | 550.00
Default | 1.00 | Units | Hz
Type | 32 Bit User Save | Update Rate | Background read
Display Format | Standard | Decimal Places | 2
Coding | RW

See At Frequency Lower Limit (03.006).

Parameter | 03.008 Over Frequency Threshold
--- | ---
Short description | Defines the threshold used to detect the over frequency condition
Minimum | 0.00 | Maximum | 550.00
Default | 0.00 | Units | Hz
Type | 32 Bit User Save | Update Rate | Background read
Display Format | Standard | Decimal Places | 2
Coding | RW

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 0.0 the threshold is based on the variable minimum/maximum for the references and is equal to 1.2 x VM_SPEED_FREQ_REF[MAX].

Parameter | 03.009 Absolute At Frequency Select
--- | ---
Short description | Set to 1 to select absolute at frequency
Minimum | 0 | Maximum | 1
Default | 0 | Units |
Type | 1 Bit User Save | Update Rate | Background read
Display Format | Standard | Decimal Places | 0
Coding | RW

See At Frequency Lower Limit (03.006).

Parameter | 03.022 Hard Frequency Reference
--- | ---
Short description | Defines the value of the hard frequency reference
Minimum | −VM_SPEED_FREQ_REF | Maximum | VM_SPEED_FREQ_REF
Default | 0.00 | Units | Hz
Type | 32 Bit User Save | Update Rate | 4ms
Display Format | Standard | Decimal Places | 2
Coding | RW, 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.

Parameter | 03.023 Hard Frequency Reference Select
--- | ---
Short description | Set to 1 to enable the use of the hard frequency reference
Minimum | 0 | Maximum | 1
Default | 0 | Units |
Type | 1 Bit User Save | Update Rate | 4ms
Display Format | Standard | Decimal Places | 0
Coding | RW

See Hard Frequency Reference (03.022).

Parameter | 03.037 Frequency Output or PWM Output Scaling
--- | ---
Short description | Defines the scaling factor applied to the frequency or PWM output
Minimum | 0.000 | Maximum | 4.000
Default | 1.000 | Units |
Type | 16 Bit User Save | Update Rate | Background
Display Format | Standard | Decimal Places | 3
Coding | RW, BU

Scale factor applied to the frequency or PWM output.

Parameter | 03.038 Maximum Output Frequency
--- | ---
Short description | Defines the maximum frequency required at the frequency output
Minimum | 0 | Maximum | 3
Default | 2 | Units | kHz
Type | 8 Bit User Save | Update Rate | Background
Display Format | Standard | Decimal Places | 0
Coding | RW, TE, BU

Value | Text | Description
0 | 1 | 15.1 bit resolution at Fmax
1 | 2 | 14.1 bit resolution at Fmax
2 | 5 | 12.8 bit resolution at Fmax
3 | 10 | 11.8 bit resolution at Fmax

Defines the maximum frequency required at the frequency output. 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.1, 2, 5, and 10kHz (0 - 3).

Fmax (kHz) | Resolution at Fmax
1 | 10 bit
2 | 9
5 | 8
10 | 7.7

Parameter | 03.072 Motor speed percent
--- | ---
Short description | Displays the final demand reference as a percentage of the reference clamp
Minimum | -150.0 | Maximum | 150.0
Default |  | Units | %
Type | 16 Bit Volatile | Update Rate | Background write
Display Format | Standard | Decimal Places | 1
Coding | RO, FI, ND, NC, PT

Motor speed percent (03.072) displays the Final Demand Reference (03.001) as a percentage of the reference clamp.

If Final Demand Reference (03.001) >= 0.00Hz then

> If Maximum Reference Clamp (01.006) = 0.00Hz then

> > Motor speed percent (03.072) = 0.0%

> else

> Motor speed percent (03.072) = Final Demand Reference (03.001) x 100 / Maximum Reference Clamp (01.006)

else

> If Negative Reference Clamp Enable (01.008) = 1 then

> > If Maximum Reference Clamp (01.006) = 0.00Hz then

> > > Motor speed percent (03.072) = 0.0%

> > else

> > > Motor speed percent (03.072) = -Final Demand Reference (03.001) x 100 / Minimum Reference Clamp (01.007)

> else

> > If Maximum Reference Clamp (01.006) = 0.00Hz then

> > > Motor speed percent (03.072)= 0.0%

> > else

> > Motor speed percent (03.072) = -Final Demand Reference (03.001) x 100 / (-Maximum Reference Clamp (01.006))