IAI America RCP2-CF - Manual (Page 122)

102
Example) If the start signal for movement to position 2 is input while the actuator is moving to position 1
in the push & hold mode, the actuator will move to the position 10 mm from where it was when
the input signal was input.
No. Position Speed
0 * *
1 50 100
2
10 100















(3) Cumulative errors due to repeated incremental moves
Position data is recognized only as a multiple of the minimum resolution. The minimum resolution is
determined by the lead and the number of encoder pulses. Therefore, a margin of error may occur
between the entered position value and the actual movement of the actuator. If an incremental move is
repeated, this error will accumulate.
The maximum error range for each actuator type is shown below:
RC model number Speed type Lead Maximum error range
RCP2 -RPA 1 mm 0.00125 mm
Low speed 3 mm 0.00375 mm
Medium speed 6 mm 0.0075 mm
RCP2 -SA5
-SA6
-SS
(R) High speed 12 mm 0.015 mm
Low speed 5 mm 0.00625 mm
Medium speed 10 mm 0.0125 mm
RCP2 -SM
-SMR
High speed 20 mm 0.025 mm
Low speed 2.5 mm 0.003125 mm
Medium speed 5 mm 0.00625 mm
RCP2 -RSA
-RXA
-RFA
High speed 10 mm 0.0125 mm
Low speed 4 mm 0.005 mm
Medium speed 8 mm 0.01 mm
RCP2 -RMA
-SA7
RCP2W -SA16
High speed 16 mm 0.02 mm
RCP2 -RTB-20
-RTC-20 Gear ratio
1/20
18
 0.0225
RCP2 -RTB-30
-RTC-30 Gear ratio
1/30
12
 0.015
Example) If an incremental move is repeated 10 times on a RCP2-SM high-speed controller, a maximum
error of 0.025 x 10 = 0.25 [mm] may generate with respect to the final position.
To eliminate these cumulative errors, an absolute command must be executed before the error tolerance is
exceeded.
(4) Ball screw accuracy
The accuracy of the ball screw used in the RCP2 conforms to C10 under the JIS standard.
=
Distance
10 mm
Command position
Start
Position complete
Completed position
Actuator movement
Speed
Position 1 Position 2
Position 2