Mitsubishi QD75M1, User Manual

Page: 521 / 882

11 - 28
MELSEC-Q
11 MANUAL CONTROL
Restricted items
A manual pulse generator is required to carry out manual pulse generator
operation.
Precautions during operation
The following details must be understood before carrying out manual pulse
generator operation.
(1) The speed during manual pulse generator operation is not limited by the
" Pr.8 Speed limit value".
(2) If the "
Cd.21
Manual pulse generator enable flag" is turned ON while the
QD75 is BUSY (BUSY signal ON), a warning will occur (warning code 100:
start during operation).
(3) If a stop factor occurs during manual pulse generator operation, the operation
will stop, and the BUSY signal will turn OFF.
At this time, the "
Cd.21
Manual pulse generator enable flag" will be left ON,
but manual pulse generator operation will not be possible. To carry out manual
pulse generator operation again, measures must be carried out to eliminate
the stop factor. Once eliminated, the operation can be carried out again by
turning the "
Cd.21
Manual pulse generator enable flag" ON OFF ON.
(4) Pulses will not be output if an error occurs when the manual pulse generator
operation starts.
Important
When the speed command beyond the following calculated value is input into the
positioning module using the manual pulse generator, the servo error "2035: data
error” (detection of the alarm "35: command frequency error at the servo amplifier)
may occur.
The following calculation formula is used to judge whether or not an error will occur.
Output pulse of manual pulse generator
×
Magnification
×
Electronic gear
(number of pulses per revolution/movement amount per revolution)
×
Number of
revolutions of manual pulse generator for one second = Speed command pps
When the speed command is larger than 2500000pps (2.5Mpps), an error may
occur.
[Calculation example for setting]
100pls
×
50
×
131072 / 500
×
2 =2621440pps
(Speed of two revolutions for one second)
=2.6Mpps
Occurrence of data error
With detection of an alarm at the servo amplifier, "2035: data error" will be given
when the command from the positioning module is larger than 2.5Mpps.
Because the command is issued according to the pulse input irrelevant of the
speed limit setting when the manual pulse generator is used for entry, "2035: data
error" will occur if a speed command, which the servo amplifier cannot follow up, is
input.
In the case of a high setting magnification, there is a high possibility of error
occurrence. Therefore, perform the setting so that the setting magnification of the
manual pulse generator decreases to the level where "2035: data error" will not
occur.