iMOTION™ controller, driver & IPM

Level 1
Level 1

# How to confirm the value CatchMAXspeed and BrakeMaxSpeed in iMotion1.0 firmware

Using iMotion1.0 firmware, the MCEWizard will output two parameters: CatchMaxSpeed and BrakeMaxSpeed affecting CatchSpin function. My questions : 1\how to set those two parameter according to specific application? 2\ whether restrictions are there for those two parameters when motor controling use CatchSpin function?
1 Solution
Moderator
Moderator

# Re: How to confirm the value CatchMAXspeed and BrakeMaxSpeed in iMotion1.0 firmware

Hi @Fergus_wang,

These parameters determine starting of the motor which is already spinning before turning on the inverter due to external forces like wind etc...

Ques 1) how to set that two-parameter according to a specific application?

Certain applications like fan the rotor may be rotating due to wind or due to some other external factors which make the motor rotate even before the start. For these kinds of applications if the motor is started from zero speed it will create noise and other disturbances to avoid this motor will be started from its existing speed and reach closed-loop state. So these parameters have to be chosen based on the speed of the free run of the motor due to external reasons ( Wind or any other drive connected to the motor)

Ques 2) whether restrictions are there for those two parameters when motor controlling use the CatchSpin function?

Setting these parameters at a very low speed can lead to failure in the startup of the motor if the free-run speed is higher than the set value.

Setting these parameters at a very high speed may damage the windings due to high current flow and back-emf will be higher than the DC Bus voltage.

These values must be chosen based on the free-run speed of the motor before turning on the inverter and based on the rated speed condition of motor.

CatchMaxSpeed( Max Forward Catch Speed)  - This is the maximum speed at which forward catch spin is attempted

BrakeMaxSpeed( Max Reverse Catch Speed )  - This is the maximum speed at which reverse catch spin is attempted

If the free-run speed is above the set threshold motor will not be started until the speed is within the limit.

Could you please try using iMotion 2.0 firmware?

Thanks,

Krupashankar

Moderator
Moderator

# Re: How to confirm the value CatchMAXspeed and BrakeMaxSpeed in iMotion1.0 firmware

Hi @Fergus_wang,

These parameters determine starting of the motor which is already spinning before turning on the inverter due to external forces like wind etc...

Ques 1) how to set that two-parameter according to a specific application?

Certain applications like fan the rotor may be rotating due to wind or due to some other external factors which make the motor rotate even before the start. For these kinds of applications if the motor is started from zero speed it will create noise and other disturbances to avoid this motor will be started from its existing speed and reach closed-loop state. So these parameters have to be chosen based on the speed of the free run of the motor due to external reasons ( Wind or any other drive connected to the motor)

Ques 2) whether restrictions are there for those two parameters when motor controlling use the CatchSpin function?

Setting these parameters at a very low speed can lead to failure in the startup of the motor if the free-run speed is higher than the set value.

Setting these parameters at a very high speed may damage the windings due to high current flow and back-emf will be higher than the DC Bus voltage.

These values must be chosen based on the free-run speed of the motor before turning on the inverter and based on the rated speed condition of motor.

CatchMaxSpeed( Max Forward Catch Speed)  - This is the maximum speed at which forward catch spin is attempted

BrakeMaxSpeed( Max Reverse Catch Speed )  - This is the maximum speed at which reverse catch spin is attempted

If the free-run speed is above the set threshold motor will not be started until the speed is within the limit.

Could you please try using iMotion 2.0 firmware?

Thanks,

Krupashankar