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“RFC-A mode stands for “”Rotor Flux Control Asynchronous”” mode, and is used to control AC induction motors. Using RFC-A mode in “”sensorless”” control means that the drive is reading the rotor speed from the EMF on the rotor itself to do closed loop control. Using RFC-A mode in “”closed loop”” or “”vector control”” typically means that the the drive is using a physical speed feedback device to perform closed loop control. RFC-S mode stands for “”Rotor Flux Control Synchronous”” mode, and is used to control AC servo motors with permanent magnet rotors (power factor of “”1””). Using RFC-S mode in “”sensorless”” control means that the drive is reading the rotor speed from the EMF on the magnets on the rotor itself to do closed loop control. Using RFC-S mode in “”closed loop”” means that the drive is using a physical speed feedback device to perform closed loop control, along with hall sensors to determine proper commutation.” “This trip is generated when the DC Bus Voltage level rises above a set level. Generally, this trip occurs when a “overhauling load”, or high-inertia condition exists during deceleration. In basic terms, the motor is converting mechanical energy into electricity, or acting like a generator. This energy must have somewhere to go,which is usually back into the drives DC Bus circuit. There are several ways to prevent this depending on the severity of the mechanical load on the motor,(adjusting Regeneration Current limit, dynamic braking resistor or using a regenerative drive or add-on module). General troubleshooting steps: Parameter 2.004 is set to “Standard” without a DBR. Parameter 2.004 is set to “Fast” if a DBR is being used. Increasing the Deceleration rate in Parameter 2.021 Tuning the current gains in Parameters 4.013 & 4.014 to higher values (i.e. doubled from the autotune)
Changing the operating mode returns all parameters to their default value, including the motor parameters. User security status (00.049) and User Security code (00.034) are not affected by this procedure. Procedure 1. Use the following procedure only if the drive is not enabled. i.e. terminal 31 is open or Pr 06.015 is OFF (0) 2. Enter either the following values in Pr mm.000, as appropriate: 1253 (50 Hz AC supply frequency) or 1254 (60 Hz AC supply frequency) 3. Change the setting Pr 00.048. 4. Either: Press the red reset button Toggle the reset digital input Carry out a drive reset through the communications interface by setting Pr 10.0378 to 100. NOTE: Entering 1253 or 1254 in Pr mm.000 will only load defaults if the setting or Pr 00.048 has been changed.
What is the difference between RFC-A and RFC-S mode on my Unidrive M700?
How do I change the operating mode on my Unidrive M700?
Communications
How do I troubleshoot at Over Voltage (OV) trip on my Unidrive M?
On a Unidrive M700, the communication ports below the keypad are Ethernet communication ports, supporting Modbus TCP and Ethernet IO. On a Undirive M701, the communication ports below the keypad are RS485 serial communication ports, supporting Modbus RTU.
What is the difference between a Unidrive M700 and an M701?
Checking the DBR parameter settings Determine if DBR is sized properly”
I am getting a “Brake R Too Hot” trip on my drive, but I am not using a braking resistor. How do I clear this trip?
If you do not have a brake resistor physically wired to the drive set Pr. 10.030, Pr. 10.031 and Pr. 10.061 all to “0”. This will disable the braking resistor thermal modelling which in turn will disable the Brake R Too Hot trip.
Quick Start
Restoring parameter defaults Restoring parameter defaults by this method saves the default values in the drives memory. User security status (00.049) and User security code (00.034) are not affected by this procedure). Procedure 1. Ensure the drive is not enabled, i.e. terminal 31 is open or Pr 06.015 is OFF (0) 2. Select ‘Reset 50 Hz Defs’ or ‘Reset 60 Hz Defs’ in Pr mm.000.(alternatively, enter 1233 (50 Hz settings) or 1244 (60 Hz settings) in Pr mm.000). 3. Either: Press the red reset button Toggle the reset digital input Carry out a drive reset through communications interface by setting Pr 10.038 to 100.
How do I default my Undirive M700 back to it's factory parameter defaults?
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