The PowerFlex 755 AC Drive is designed with a number of safety features to assist protect anyone working with or near the drive as well as the drive itself and the equipment it controls. Several of the safety features of the PowerFlex 755 AC Drive are listed below:
1. Safe Torque-Off (STO):
This feature lowers the motor’s torque when the drive is halted, preventing the motor and the machinery it controls from moving suddenly.
When STO is engaged, the drive’s output is shut off and the motor’s torque is decreased. The motor will therefore be assured to stop moving until the STO function is reset. In addition to protecting humans from the movement of the motor, STO can also prevent damage to the machinery that the motor is regulating.
When the STO function is activated by a switch or other device, the drive is typically told to shut down the output and reduce torque from the motor. While some STO devices could be externally mounted to the drive, others might be built right inside the drive.
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2. Safe Speed Monitor (SSM):
This procedure monitors the drive’s output speed and compares it to a predetermined safe speed limit. If the speed restriction is exceeded, the drive will shut down to prevent dangerous operation.
The SSM function can be especially useful in situations when the motor speed needs to be carefully regulated for safety. For instance, when a motor is powering a conveyor belt or other piece of moving equipment, the SSM function can be used to regulate how swiftly it goes in order to protect the safety of employees nearby.
Before utilising the SSM function, the user must first choose a motor speed restriction that is safe. This limitation is often based on the requirements of the application and is meant to ensure the safe operation of the motor and the machinery it controls. After the safe speed restriction has been established, the SSM function continuously measures the motor’s speed and compares it to the safe speed limit. If the motor speed exceeds the safe speed limit, the drive will halt and a message will show.
3. Safe Stop 1 (SS1):
This function enables a regulated motor deceleration to a safe halt when a fault or emergency stop is detected.
When SS1 is engaged, the drive employs a controlled ramp down in motor speed to slow the motor down and bring it to a safe stop. As a result, there are less likely to be any sudden stops or jerky movements that might threaten persons or property. The SS1 function helps the engine and equipment survive longer by avoiding wear and tear caused by sudden stops in addition to ensuring a secure stop.
The SS1 function is often activated by a switch or other device that tells the drive to start the controlled deceleration. Some SS1 devices could be included within the drive’s design, while others might be connected to the drive outside.
4. Safe Stop 2 (SS2):
Safe Stop 2 (SS2) is an additional security function of the Allen Bradley PowerFlex 755 AC Drive. The SS2 feature adds an additional level of safety by monitoring the drive’s output and making sure that the motor stops safely in the event of a fault or emergency stop.
When SS2 is activated, the drive monitors the output and begins a controlled deceleration of the motor to a safe stop in the event that a defect or emergency stop is detected. As a result, there are less chances of unexpected pauses or movements from the machinery the motor controls endangering persons or property. The SS2 function can also help shield the engine and other gear from harm caused by abrupt stops.
5. Motor overload protection:
Motor overload avoidance is another safety feature of the PowerFlex 755 AC Drive. This feature aims to protect the motor from damage caused by high heat buildup as a consequence of overloading or other issues. An increased current flow and overheating brought on by overloading might ruin the motor’s insulation, windings, and bearings.
To prevent motor damage from overloading, the PowerFlex 755 AC Drive incorporates a number of motor overload prevention systems. A good example of this is thermal overload protection, which monitors the motor’s temperature and reduces the drive’s power if it increases over a safe threshold. The drive also incorporates current overload protection, which monitors the motor’s current usage and reduces the output of the drive if the current rises over a safe level.
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6. Ground fault protection:
The PowerFlex 755 AC Drive also has ground fault protection. A ground fault develops when an electrical current flows from an energised conductor to the ground or another conductive surface. Ground faults can be caused by a variety of causes, such as defective insulation, moisture, or contact with a conductor. Ground faults may be dangerous because they may cause fires, equipment damage, or even electrical shock.
The PowerFlex 755 AC Drive incorporates ground fault protection to help reduce these dangers. The drive’s ground fault protection circuitry monitors the current flowing through its ground channel and turns off the drive’s power if a ground fault is discovered. This reduces the likelihood that a ground fault may result in an electrical shock and equipment damage.
7. Short circuit protection:
The drive features short circuit protection to help prevent damage to both the drive and the equipment it controls in the event of a short circuit.
8. Overvoltage/Undervoltage protection:
The drive monitors the input voltage and will shut off if it rises or falls outside of a predetermined range, helping to protect the drive and other equipment from damage.
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