Mitsubishi Electric FR-A700 Technical Manual page 281

(4) Selection of clear signal (CLR signal) [Pr.
429]
Use this function to make a drooping pulse 0 for
home position operation, etc.
When [Pr. 429 = 0], the deviation counter is cleared at
the edge of turning ON of the clear signal (CLR). The
CLR signal turns ON in synchronization with the zero
pulse signal of encoder for home position operation,
etc. and clears the deviation counter.
When [Pr. 429 = 1] (initial value), the deviation
counter is cleared while the clear signal (CLR) in ON.
For the terminal used for CLR signal input, set 69 in
any of [Pr. 178 to Pr. 189
selection] to assign the function.
When [Pr. 429 = 0]
Deviation counter
image
CLR
When [Pr. 429 = 1] (initial value)
Deviation counter
image
CLR
2.11.5 Setting the electronic gear [Pr. 420, 421, 424]
Set the ratio of the machine side gear and the motor side gear.
[Pr. ] Name
Command pulse scaling factor
420
numerator
Command pulse scaling factor
421
denominator
Position command acceleration/
424
deceleration time constant
* When the operation panel (FR-DU07) is used, the maximum setting is 9999. When a parameter unit is used, up to the maximum
value within the setting range can be set.
(1) Calculation of the gear ratio [Pr. 420, 421]
The position resolution (travel per pulse
determined by the travel per motor revolution
and the feedback pulses Pf [pulse/rev] of the detector,
and is represented by the following expression.
s
=
Pf
Input terminal function
ON
Counter clear at the edge of
turning ON of the signal
ON
Counter clear while ON
Initial Setting
Value Range
1 0 to 32767
1 0 to 32767
0s 0 to 50s
[mm]) is
[mm]
315
(5) Pulse monitor selection [Pr. 430]
The status of various pulses during running are
displayed.
Set [Pr. 52 DU/PU main display data selection = 6] to
display output frequency monitor.
Count the number of pulses when the servo is ON.
The cumulative pulse value is cleared when the base
is shut off or the clear signal (CLR) is turned ON.
[Pr. 430]
Description
setting
0 The cumulative
command pulse value is
1 displayed.
2
The cumulative feedback
pulse value is displayed.
3
4
The droop pulses are
displayed.
5
9999 Frequency monitor is displayed. (initial value)
A700
(A700)
Description
*
Set the electric gear.
[Pr. 420] is a numerator and [Pr. 421] is a denominator.
*
Used when rotation is not smooth at a large electronic gear
ratio (about 10 times or more) and low speed.
:travel per pulse [mm]
s :1[mm]
Pf :number of feedback pulses [pulse/rev]
(number of pulses after multiplying the number
of encoder pulses by four)
PARAMETER
Display Range
FR-PU04
FR-DU07
FR-PU07
Lower 4 Lower 5
digits digits
Upper 4 Upper 5
digits digits
Lower 4 Lower 5
digits digits
Upper 4 Upper 5
digits digits
Lower 4 Lower 5
digits digits
Upper 4 Upper 5
digits digits
2