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ASDA-A3

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Troubleshooting

AL056 Excessive motor speed

Trigger condition

and cause

Condition: when the filtered motor speed exceeds the setting of P1.111, the servo

drive immediately switches to the Servo Off state and displays this alarm.

Cause: this alarm is to remind the user that the motor speed has reached the

upper limit of the current setting (P1.111).

1. Check the reason for the high motor speed, such as the set value of P1.111 is

too small, the bandwidth is not set properly, or the linear motor parameter

Checking method

and corrective action

setting does not match the linear motor specification.

2. Evaluate the motor speed and the condition of the mechanical parts.

If allowable, increase the speed and the set value of P1.111.

How to clear the

alarm?

DI.ARST

14

AL057 Feedback pulse is lost

Condition: when P2.081 is set to 1, the servo drive will detect if there is pulse

Trigger condition

and cause

leakage. When the pulse leakage exceeds the set value of P2.082, this alarm is

triggered.

Cause:

1. Pulse leakage occurs during motor operation.

2. The pulse signal is interfered by noise.

1. Check if pulse leakage has occurred to the motor encoder feedback due to

noise interference.

2. If there is interference, check the following items:

(a) Check if the motor is properly grounded. Make sure the ground end

(green) of the power cable is grounded to the servo drive heat sink.

(b) Use shielded cable for the feedback signal cable. Make sure the signal

cable is separated from the power supply or any high-current cables to

avoid interference.

Checking method 3. If the encoder feedback type is a square-wave digital signal, check if the motor

and corrective action

speed is too fast and exceeds the maximum limit of 16 MHz that the hardware

can receive (the limit is 4 times the frequency).

4. In addition to eliminating the noise interference, if the encoder type is a

square-wave digital signal, you can also filter the noise by setting the

applicable filter functions. When the main encoder signal source is CN2

(PM.003.U = 0), set PM.003.Z. When the main encoder signal source is CN5

(PM.003.U = 1), set P1.074.U.

5. Set the maximum speed limit of the motor with P1.055.

How to clear the

alarm?

6. Check if P2.083 is set correctly.

Cycle power on the servo drive.

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