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What is the cause and method of rectifying Err 18.0 regeneration overload fault protection and Err 12.0 excessive voltage protection (excessive voltage fault protection caused by regeneration of amplifier A and B frame)?

ID:
40387
Issued:
Apr 3rd, 2017
Updated:
Apr 27th, 2017

What is the cause and method of rectifying Err 18.0 regeneration overload fault protection and Err 12.0 excessive voltage protection (excessive voltage fault protection caused by regeneration of amplifier A and B frame)?

ANSWER

■ Cause: Err18.0 (Regeneration overload fault protection)
If the motor rotation direction and torque direction are opposite, the motor will enter power generation mode and the regenerated energy will return from the motor to the PN voltage unit of the servo-amplifier. If this state persists, the voltage of the PN voltage unit will increase and exceed the withstand voltage of the capacitor, causing it to blow. Before this condition occurs, connect a resistor via a power transistor between the P-N and cause the transistor to turn ON to dissipate the increased energy as heat from the transistor. The regeneration starting voltage is set in the amplifier so that the transistor is turned on to dissipate excessive energy as heat emitted by the regeneration resistor if the voltage is higher than the set voltage, until it falls to below it. To make the built-in regeneration resistor effective, the initial setting makes the ON duty 1% or less (Pr0.16 = 0). If this limit is exceeded, Err18.0 (regeneration overload fault protection) is generated.
■ Action: Err18.0 (regeneration overload fault protection)
(1) If a regeneration overload fault is generated without the motor in operation
Power source voltage check 100-V products 135 V AC, 200-V products 275 V AC or below. If no problem is detected, replace the amplifier.
(2) If a regeneration overload fault is generated with the motor in operation (while checking the regeneration overload rate)
● If the error occurs at constant speed, reduce the load or speed, or increase the motor/amplifier capacity
If an externally-attached regeneration resistor is being not used, install one.
Check if the value of Pr0.16 is appropriate.
(0: Internal resistance, 1: 10% limit for external resistor, 2: No limit for external resistor, 3: No regeneration operation)
● If the error occurs during deceleration, reduce the load, increase the deceleration time, increase stopping time, or reduce the motion speed.
Attach an external regeneration resistor if not used.
If there is no problem with the external regeneration resistor capacity, set Pr0.16=2 and make the regeneration overload fault invalid.
Check if the Pr0.16 value is appropriate.
(0: Internal resistance, 1: 10% limit for external resistor, 2: No limit for external resistor, 3: No regeneration operation) If the error occurs with a speed change, or the speed rapidly changes, set the deceleration time.

■ Cause: Err12.0 Excessive voltage fault protection (Excessive voltage fault protection caused by regeneration of amplifier A and B frames)
As A and B frames do not contain regeneration resistors, regeneration energy increases the P-N voltage. If the voltage exceeds the excessive voltage detection threshold, excessive voltage fault protection Err 12.0 is generated.
■ Action: Err12.0 Excessive voltage protection (Excessive voltage fault protection caused by regeneration of amplifier A and B frames)
To increase regeneration capacity, install an external regeneration resistor. Replace the wiring with an internal resistor (Remove jumpers and shorting bars to eliminate the risk of parallel use with the internal resistor to protect transistor breakage) and connect an external regeneration resistor to B1-B2 for A5, and P-B for A6. Set Pr0.16 = 1 to generate regeneration overload fault at 10% duty, or set Pr0.16 = 2 to make the regeneration overload fault invalid.
The resistance value of the regeneration resistor is determined by the current capacity of the power transistor for driving the internal regeneration resistor. The recommended resistance value as an option is the minimum value. Resistance values below the recommended minimum cannot be used to prevent amplifier breakage. Note that while making the regeneration overload fault invalid, the application of continuously generating regeneration with constant pull-back cannot be used because it would increase heat generation in the amplifier. Regeneration load rate can be checked in the monitor mode of the amplifier front panel “d14.rG” or Panaterm monitor waveform graphics. If the regeneration load rate reaches 100%, a signal is generated that warns of a fault. Regeneration overload warning (warning number A1) is generated at 85% but does not cause any motion to affect the operation.


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