Mitsubishi Electronics QD75P, QD75D user manual Limit signal

11 MANUAL CONTROL

MELSEC-Q

Precautions during operation

The following details must be understood before inching operation is carried out.

(1)Acceleration/deceleration processing is not carried out during inching operation.

(Pulses corresponding to the designated inching movement amount are output at the first control cycle of the QD75 (1.8 ms). The movement direction of inching operation is reversed and, when a backlash compensation is carried out, first pulses corresponding to the backlash amount are output in the first control cycle of the QD75 and then pulses corresponding to the designated inching movement amount are output in the subsequent control cycles.)

The " Cd.17 JOG speed" is ignored even if it is set. An error will occur in the

following cases (error code: 301).

( Cd.16 Inching movement amount) x (A) > ( Pr.31 JOG speed limit value)

Where (A) is as follows.

•When the unit is pulse: 562.5

•When the unit is other than pulse: 337.5

(2)JOG start signal OFF ON immediately after stop signal ON OFF (within 100 ms) is ignored.

(Operation will not start.)

(3)Set a value other than a "0" in " Cd.16 Inching movement amount".

If a "0" is set, the operation will become JOG operation (Refer to Section 11.2 "JOG operation".

Errors during operation

When the operation is stopped by the stroke limit (limit signal OFF), inching operation can be performed in the direction in which the limit signal turns ON after an error reset. (An error will occur again if the JOG start signal in the direction in which the limit signal turns OFF is turned ON.)

V

Inching operation

Inching operation possible	Inching operation not possible
ON
Upper/lower	OFF
limit signal

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