Mitsubishi Electronics QD75D, QD75P user manual Precautions during operation, Pr.48

8 OPR CONTROL

Restrictions

MELSEC-Q

A pulse generator with a zero signal is required.

When using a pulse generator without a zero signal, generate a zero signal using an external signal.

Precautions during operation

(1)An error "Start at OP (error code: 201)" will occur if another machine OPR is attempted after a machine OPR completion when the OPR retry function is not set

("0" is set in "

Pr.48

OPR retry").

(2) Machine OPR carried out from the near-point dog ON position will start at the

" Pr.47 Creep speed".

(3)The near-point dog must be ON during deceleration from the OPR speed " Creep speed".

Pr.47

The workpiece will continue decelerating and stop if the near-point dog is turned OFF before it has decelerated to the creep speed, thus causing an error "Dog detection timing fault (error code: 203)".

		V	Pr. 46 OPR speed
				Pr. 47 Creep speed
				t
			ON
			Near-point dog OFF
		ON
Machine OPR start	OFF
(Positioning start signal)
		ON
OPR request flag	OFF
[ Md.31 Status : b3]
OPR complete flag	OFF
[ Md.31 Status : b4]
Md.26 Axis operation status Standing by		In OPR		In error
Md.34 Movement amount	Inconsistent	0
after near-point dog ON
Md.20 Current feed value	Inconsistent	Value the machine moved is stored		Address at stop

Md.21 Machine feed value

Fig. 8.3 Operation when the near-point dog is turned OFF before the creep speed is reached

(4)When a machine OPR is stopped with the stop signal, perform a machine OPR again. If the restart command is turned ON after a stop with the stop signal, an error "OPR restart not possible" (error code: 209) occurs.

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