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Emerson Powerdrive F300 - Additional Parameters for RFC-S Sensorless Control

Emerson Powerdrive F300
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Powerdrive F300 User Guide 127
Issue Number: 2
Each bit in this parameter has the following functions:
Example
Pr 10.037=8 (1000
binary
) Th Brake Res trip is disabled
Pr 10.037=12 (1100
binary
) Th Brake Res and phase loss trip is disabled
Stop on non-important trips
If bit 0 is set to one the drive will attempt to stop before tripping if any of
the following trip conditions are detected: I/O Overload, An Input 1 Loss,
An Input 2 Loss or Keypad Mode.
Disable braking resistor overload detection
For details of braking resistor overload detection mode see Pr 10.030.
Disable phase loss trip
Normally the drive will stop when the input phase loss condition is
detected. If this bit is set to 1 the drive will continue to run and will only
trip when the drive is brought to a stop by the user.
Disable braking resistor temperature monitoring
Size 3, 4 and 5 drives have an internal user install braking resistor with a
thermistor to detect overheating of the resistor. As default bit 3 of
Pr 10.037 is set to zero, and so if the braking resistor and its thermistor
is not installed the drive will produce a trip (Th Brake Res) because the
thermistor appears to be open-circuit. This trip can be disabled so that
the drive can run by setting bit 3 of Pr 10.037 to one. If the resistor is
installed then no trip is produced unless the thermistor fails, and so bit 3
of Pr 10.037 can be left at zero. This feature only applies to size 3, 4 and
5 drives. For example if Pr 10.037 = 8, then Th Brake Res trip will be
disabled.
Disable parameter freeze on trip
If this bit is 0 then the parameters listed below are frozen on trip until the
trip is cleared. If this bit is 1 then this feature is disabled.
When Serial Address (11.023), Serial Mode (11.024), Serial Baud Rate
(11.025), Minimum Comms Transmit Delay (11.026) or Silent Period
(11.027) are modified the changes do not have an immediate effect on
the serial communications system. The new values are used after the
next power-up or if Reset Serial Communications (11.020) is set to one.
Reset Serial Communications (11.020) is automatically cleared to zero
after the communications system is updated.
Pr 00.053 is the motor thermal time constant of the motor, and is used
(along with the motor rated current Pr 00.046, and total motor current
Pr 00.012) in the thermal model of the motor in applying thermal
protection to the motor.
Setting this parameter to 0 disables the motor thermal protection.
For further details, refer to section 8.4 Motor thermal protection on page
132.
6.3.10 Additional parameters for RFC-S sensorless
control
If sensorless mode is being used and is active (i.e. Sensorless Mode
Active (03.078) = 1) and the motor speed is below Rated Speed (00.045)
/ 10 then a special low speed algorithm must be used to control the
motor. RFC Low Speed Mode (00.054) is used to select the algorithm to
be used.
0: Injection
A high frequency signal is injected into the motor to detect the motor flux
axis. This can be used in a similar way to operation with position
feedback except that for the drive to remain stable the speed controller
bandwidth may need to be limited to 10 Hz or less and the current limit
may need to be limited (see Low Speed Sensorless Mode Current
(00.055)).
Bit Function
0 Stop on non-important trips
1 Disable braking resistor overload detection
2 Disable phase loss stop
3 Disable braking resistor temperature monitoring
4 Disable parameter freeze on trip
Open-loop mode RFC-A and RFC-S modes
Reference Selected (01.001) Reference Selected (01.001)
Pre-skip Filter Reference (01.002) Pre-skip Filter Reference (01.002)
Pre-ramp Reference (01.003) Pre-ramp Reference (01.003)
Post Ramp Reference (02.001) Post Ramp Reference (02.001)
Frequency Slaving Demand
(03.001)
Final Speed Reference (03.001)
Speed Feedback (03.002)
Speed Error (03.003)
Speed Controller Output (03.004)
Current Magnitude (04.001) Current Magnitude (04.001)
Torque Producing Current
(04.002)
Torque Producing Current
(04.002)
Magnetising Current (04.017) Magnetising Current (04.017)
Output Frequency (05.001) Output Frequency (05.001)
Output Voltage (05.002) Output Voltage (05.002)
Output Power (05.003) Output Power (05.003)
D.c. Bus Voltage (05.005) DC Bus Voltage (05.005)
Analog Input 1 (07.001)* Analog Input 1 (07.001)*
Analog Input 2 (07.002)* Analog Input 2 (07.002)*
00.052 {11.020} Reset Serial Communications
RW Bit ND NC
OL
Ú
Off (0) or On (1)
Ö
Off (0)RFC-A
RFC-S
00.053 {04.015} Motor Thermal Time Constatnt
RW Num US
OL
Ú
1.0 to 3000.0 s
Ö
89.0 sRFC-A
RFC-S
00.054 {05.064} RFC Low Speed Mode
RW Txt US
OL
Ú Ö
RFC-A
RFC-S
Ú
Injection (0), Non salient (1)
Ö
Non salient (1)

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