Menu 3 − Frequency Monitoring

Mode: Open‑Loop


Parameter03.005  Zero Speed Threshold
Short descriptionSet to the required zero speed threshold
ModeOpen‑Loop
Minimum0.0Maximum20.0
Default1.0UnitsHz
Type8 Bit User SaveUpdate RateBackground read
Display FormatStandardDecimal Places1
CodingRW, BU

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


Parameter03.006  At Speed Lower Limit
Short descriptionSet to the required minimum at speed threshold
ModeOpen‑Loop
Minimum0.0Maximum599.0
Default1.0UnitsHz
Type16 Bit User SaveUpdate RateBackground read
Display FormatStandardDecimal Places1
CodingRW

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

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

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

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

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

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


Parameter03.007  At Speed Upper Limit
Short descriptionSet to the required maximum at speed threshold
ModeOpen‑Loop
Minimum0.0Maximum599.0
Default1.0UnitsHz
Type16 Bit User SaveUpdate RateBackground read
Display FormatStandardDecimal Places1
CodingRW

See At Speed Lower Limit (03.006).


Parameter03.008  Over Speed Threshold
Short descriptionSet to the required over speed threshold
ModeOpen‑Loop
Minimum0.0Maximum599.0
Default0.0UnitsHz
Type16 Bit User SaveUpdate RateBackground read
Display FormatStandardDecimal Places1
CodingRW

If Over Speed Threshold (03.008) is set to a non-zero value it defines the over speed threshold. If the Post Ramp Reference (02.001) exceeds this threshold in either direction an Over Speed trip is produced. If Over Speed 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].


Parameter03.009  Absolute At Speed Select
Short descriptionIndicates when the motor is running at speed
ModeOpen‑Loop
Minimum0Maximum1
Default0Units 
Type1 Bit User SaveUpdate RateBackground read
Display FormatStandardDecimal Places0
CodingRW

See At Speed Lower Limit (03.006).


Parameter03.075  Initialise Position Feedback
Short descriptionSet to 1 to re-initialise any position feedback device connected
ModeOpen‑Loop
Minimum0Maximum1
Default0Units 
Type1 Bit VolatileUpdate RateBackground read
Display FormatStandardDecimal Places0
CodingRW, NC

If Initialise Position Feedback (03.075) is set to one any position feedback devices connected to the drive position feedback interfaces or any position feedback category option modules will be re-initialised.


Parameter03.076  Position Feedback Initialized
Short descriptionIndicates the initialisation state of position feedback devices connected
ModeOpen‑Loop
Minimum0
(Display: 0000000000)
Maximum1023
(Display: 1111111111)
Default0
(Display: 0000000000)
Units 
Type16 Bit VolatileUpdate RateBackground write
Display FormatBinaryDecimal Places0
CodingRO, NC, PT

Position Feedback Initialized (03.076) contains flags that represent the initialisation state of position feedback devices connected to the drive position feedback interfaces or position feedback interfaces on position feedback category option modules. One indicates that the interface is initialised and zero indicates that the interface is not initialised. The flags are assigned as shown below. 

Bit Position feedback interface
0 P1 Drive
1 P2 Drive
2 P1 Option slot 1
3 P2 Option slot 1
4 P1 Option slot 2
5 P2 Option slot 2
6 P1 Option slot 3
7 P2 Option slot 3
8 P1 Option slot 4
9 P2 Option slot 4

If no option module, or an option module other than a position feedback category module, is fitted in an option slot then the relevant flag is always set to one. If an attempt is made to enable the drive when any of the flags are zero the drive initiates an Encoder 7 trip. If a drive reset is initiated, the bits in Position Feedback Initialized (03.076) are checked, and if any position feedback devices are not initialised an attempt is made to initialise them.

The table below shows the initialisation process for different position feedback devices that can be connected to the drive.

Encoder types Initialisation process
AB, FD, FR
Resolver
None.  Initialisation is immediate and is always successful. The position feedback is set to zero on initialisation.
AB Servo
FD Servo
FR Servo
SC Servo

The absolute position used to control a motor can only be defined accurately after two different changes of state of the UVW commutation signals. Initialisation resets the system that ensures that the UVW signals alone will be used to define the motor position until the encoder has moved through two valid commutation signal state changes. Initialisation is immediate and is always successful. The position feedback is set to zero on initialisation.

SC

The SINCOS interpolation system must be initialised. Initialisation is immediate and is always successful. The position feedback is set to zero on initialisation.

SC Hiperface
SC EnDat
SC SSI

Auto-configuration if required except SC SSI.
The absolute position must be obtained via comms. This may cause a large change in position feedback.
The SINCOS interpolation system must be initialised. This may have a small effect on the position feedback.

EnDat
BiSS
SSI
Auto-configuration if required except SSI.
The absolute position must be obtained via comms. This may cause a large change in position feedback.

SC SC

The absolute position used to control a motor is obtained from the sine and cosine signals provided for one revolution until the marker pulse occurs. The position obtained from the marker pulse is assumed to be a position of zero. Once a marker has occurred the incremental position is used and the single turn sine wave signals are ignored. When the position feedback device is initialised the single turn sine wave signals are used again until another marker event occurs. No part of the initialisation process affects the position feedback seen in parameters, except that the SINCOS interpolation system must be initialised which may have a small effect on the position feedback.  Initialisation is immediate and is always successful.