What would cause the driver not do its job in the following scenario. The follow
ID: 1714900 • Letter: W
Question
What would cause the driver not do its job in the following scenario. The following is a block diagram of a DC motor control system. The motor is used to turn a mechanical load. The motor has an electro-mechanical brake. When the controller sends a signal, the brake will engage, thus stopping the motor. While at rest, a user requested the motor to move CW via the controller, but the motor did not have any motion. Let us identify the cause of this problem.
Note the EMO is the emergency off system.
EMODC Power 2 Supply ControllerGnd_ Brake Driver Over current Dir Gnd circuit breakerExplanation / Answer
1 - Brakes Block:
Disengage the brakes block completely, i.e physicsl connection to the motor an with controller (via wires). Now send the command from controller to ceck if the motor moves.
outcome 1: motor does not move = brakes block has nothing to do with the fault
outcome 2: motor starts to move
Do: connect the brakes block to controller but not to the motor and then send command via controller to move motor
Check 1: is the motor moving ? Yes = physical connection of brakes block to the motor of is faulty
No = physical connection of brakes block to the motor is not faulty
Do: connect the brakes block to the motor but not the wires of motor to the ontroller
Check: is the motor moving ? Yes = connection of brakes block to the controller is faulty
No = connection of brakes block to the controller is not faulty
2 - EMO
Disengage EMO. send command from controller to the motor to move it.
Check 1: Is the motor moving ? Yes = EMO is faulty
No = EMO isn't the problem
3 - Motor:
Disengage the motor from all connections (driver/brakes etc).
Check: Does the motor moves on providing the (rated) voltage/current ?
No = Motor is faulty
Yes = Motor is just fine
4 - Driver:
Disengage driver from motor and brakes block Send the command from controller towards the driver to move the motor
Check:
Do the driver have output ? (you can check using CRO or DMM)
Yes = Driver is working fine
No = Driver is Faulty
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