Contents
Alarm
Fanuc Alarm 90 REFERENCE RETURN INCOMPLETE
Fanuc Alarm Description
21 Model B
The reference position return cannot be performed normally because the reference position return start point is too close to the reference position or the speed is too slow. Separate the start point far enough from the reference position, or specify a sufficiently fast speed for reference position return. Check the program contents.
OR
1. The reference position return cannot be performed normally because the reference position return start point is too close to the reference position or the speed is too slow.Separate the start point far enough from the reference position, or specify a sufficiently fast speed for reference position return.
2. During reference position return with the absolute–position detector,if this alarm occurs even though condition 1 is satisfied, do the following:After turning the servo motor for the axis at least one turn, turn the power off and then on again. Then perform reference position return.
30i, 31i, 32i Model A
1. The reference position return cannot be performed normally because the reference position return start point is too close to the reference position or the speed is too slow. Separate the start point far enough from the reference position, or specify a sufficiently fast speed for reference position return.
2. An attempt was made to set the zero position for the absolute position detector by return to the reference position when it was impossible to set the zero point. Rotate the motor manually at least one turn, and set the zero position of the absolute position detector after turning the CNC and servo amplifier off and then on again.
Troubleshooting
Contents
Reference position return was executed when the following condition is not satisfied:
The CNC received one rotation signal at least one time when the axis is moving to the reference position at a speed higher than a speed equivalent to 128 pulses of position error amount(DGN300).
Countermeasures
CAUTION
After the pulse coder or motor is exchanged, reference position or machine’s standard point may be different from former one. Please set it correctly.
Reference
A speed more than 128 pulses is required because if speed is lower that this, one–rotation signal does not function stably, causing improper position detection.
If bit 0 of parameter No. 2000 is set to 1, a speed corresponding to a positional deviation of 1280 pulses or more is required.
Parameter No. 1836 can be set to 128 or less, as the minimum positional deviation with which reference position return is possible. (If the parameter is set to 0, 128 is assumed as the minimum positional deviation.
If bit 0 of parameter No. 2000 is set to 1, a value equal to ten times the set value is used for checking.)