Panasonic A4P Series instruction manual Limit Sensor + Z phase, 120

Homing Operation

Limit Sensor + Z phase

Example: Z phase count = 3 at an operation in a positive direction

		Direction of homing
	Positive direction￿				Negative direction￿
	limit sensor				limit sensor
			Z phase
(1) A starting point is at any place ￿				L-SPD
other than on the negative limit ￿
sensor			H-SPD
(2) A starting point is on the negative ￿				L-SPD
limit sensor

Detect the home sensor and the limit sensor in a reverse direction, not in a direction of homing, by 16.Pr30 (Homing speed (high)), decelerate, and stop. After that, detect the limit sensor turning off in a direction of homing by 16.Pr31 (Homing speed (low)), count the Z phase specified times by 16.Pr3B (homing Z phase count setting) and define that point as a home position.

• Parameters related to this operation

Parameter number		Description￿
￿	30￿	Specify the high speed for the homing operation (0 to 6000 r/min).￿
￿
	31￿	Specify the low speed for the homing operation (0 to 6000 r/min).￿
￿
	32￿	Specify the offset operation speed if the home offset operation is performed (0 to 6000 r/min). For the home
￿	￿	offset operation, refer to page 124.￿
￿	33￿	Specify the acceleration for the homing operation in a range between 0 to 3000 r/min.￿
16.Pr**￿
	34￿	Specify the deceleration for the homing operation in a range between 3000 to 0 r/min.￿
￿	35￿	Specify an operating direction for the homing. (0: positive direction, 1: negative direction)￿
￿
	36￿	Specify a type of homing. ([3]: Limit sensor + Z phase)￿
￿
	37￿	Specify whether or not to perform the home offset operation. (0: Not perform, 1: Perform) For the home offset
￿	￿	operation, refer to page 124.￿
￿	3B￿	Specify the Z phase that an operation stops. ([3] (the 3rd Z phase) in this example)￿
32.Pr**	01	Specify the home offset (–2147483647 to 2147483647 pulses). If the home offset is not required, specify “0”.

Caution

1)If any of the set values of the parameters below is “0”, an operation trips due to homing error protection (error code No. 68) and stops according to an operation at alarm occurrence.

•16.Pr30 (Homing speed (high))

•16.Pr31 (Homing speed (low))

•16.Pr33 (Homing acceleration setting)

•16.Pr34 (Homing deceleration setting)

2)Also, if the over-travel inhibit input is enabled in an operating direction under any of the conditions below during homing, an operation trips due to homing error protection (error code No. 68) and stops according to an operation at alarm occurrence.

•A limit sensor in a traveling direction has been detected during detection of specified count of Z phase How to decelerate at the detection of a limit sensor depends on the settings of SV.Pr55 (Over-travel inhibit input operation setting). (For a set value = 0 or 2, deceleration-and-stop. For a set value = 1 or 3, stop in the deceleration time “0”.)

3)We would like to ask you to design so that a sensor signal does not vary (beyond the sensor signal width) when the motor is decelerating after it detects the limit sensor.

4)We would like to ask you to design so that the Z phase of the motor does not turn on near the Z phase detection start position (L-SPD out of the negative limit sensor area in a figure shown above). The number of Z phase counts may vary.

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