Editing Argon user guide/Braking resistor
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− | + | [[File:Regenres.jpg|400px|thumb|250 Watt 82 ohm regenerative resistor suitable for Argon drive]] | |
+ | Regenerative resistors are usually a required part with servo drives to absorb returned energy from decelerating or braking servo axis. | ||
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+ | Servo drive with motor can act two ways: energy supply and energy generator. The generator behavior occurs during decelerations and this causes current flow from motor to drive power supply capacitors. If that generated energy is not absorbed anywhere, the voltage of capacitors will rise above overvoltage threshold and trigger an (software clearable) overvoltage fault. | ||
Argon supports connecting braking resistor directly to drive [[Argon_wiring#J3_24V_power_and_motor_brake_port|J4 connector]]. | Argon supports connecting braking resistor directly to drive [[Argon_wiring#J3_24V_power_and_motor_brake_port|J4 connector]]. | ||
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==Suitable resistor type== | ==Suitable resistor type== | ||
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Recommended resistor specifications: | Recommended resistor specifications: | ||
− | *Resistance 80-100 ohms | + | *Resistance 80-100 ohms |
− | + | *Power rating 150-300 Watts | |
− | *Power rating 150-300 Watts | + | |
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The 250W resistor in the image can absorb enough peak energy to stop 100 kg mechanical linear axis moving up to 3 m/s. | The 250W resistor in the image can absorb enough peak energy to stop 100 kg mechanical linear axis moving up to 3 m/s. | ||
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==Installation== | ==Installation== | ||
− | + | The image above shows proper wiring of braking resistor. Proper installation has: | |
− | The image | + | |
* Shielded cable with 3 conductors with wire gauge at least 0.75 mm² / 18 AWG | * Shielded cable with 3 conductors with wire gauge at least 0.75 mm² / 18 AWG | ||
* Cable shield AND earth conductor connected to drive PE terminal | * Cable shield AND earth conductor connected to drive PE terminal | ||
* Earth conductor connected to resistor casing. Place toothed locking washers between wire terminal and resistor to break the insulating coating of resistor case. | * Earth conductor connected to resistor casing. Place toothed locking washers between wire terminal and resistor to break the insulating coating of resistor case. | ||
− | * Two other conductors connected to resistor terminals | + | * Two other conductors connected to resistor terminals |
* Resistor should be also mounted on heat sink | * Resistor should be also mounted on heat sink | ||
* Additionally it is a recommended to shield the resistor terminals from accidental touching | * Additionally it is a recommended to shield the resistor terminals from accidental touching | ||
− | + | [[File:Electricshock.png|float|left|32px]] | |
− | + | '''DANGER''' the terminals of the resistors are connected to dangerous voltages. Never touch them before drive power has been [[Power supply safe discharging|safely discharged]]. | |
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