Page 66 - ELICYLINDER-EC-IAI, CILINDRI ELETTRICI,

EC ELECYLINDER
Correlation of push force and current limit value
In push-motion operation, the push force can be changed by setting the current limit value of the controller between 20% and 70%.
The maximum push force will vary depending on the model, so please refer to the graphs below and on the following page, and select a type based on the needed push force for your intended use.
Correlation of Push Force and Current Limit Value EC-S6/S6£H/R6/RR6/R6£W
Correlation of push force and current limit value
Lead 3
Lead 6
Lead 12
50
00 10 20 30 40 50 60 70 80
Current limit value (%)
EC-R7/RR7/R7£W
Correlation of push force and current limit value
1200 100
90
1000 Lead 4
800 70
Lead 8 60 600 50
400 40 Lead 16 30
EC-S7/S7£H
Correlation of push force and current limit value
400 350 300 250 200 150 100
700
600 Lead 4 500
400 Lead 8 300
200 Lead 16 100 Lead 24
EC-RP4/GS4/GD4/TC4/TW4
Correlation of push force and current limit value
Lead 2
Lead 4 Lead 6
40 50
200
20
10 00
0 10 20 30 40 50 60 70 80 0 10 Current limit value (%)
¢Notes for Slider and Mini Table Types
Lead 20
00 10 20 30 40 50 60 70 80 Current limit value (%)
Lead 24
When performing the push-motion operation with the slider type, and mini table type please limit the push current in order that the reactive moment caused by the push force does not exceed the dynamic allowable moment (Ma, Mb) in the catalog. Please refer to the figures below, which show the working point of the guide moment, for help with calculating the moment. This can be done by considering the offset of the push force application position.
Please note that if excessive force which exceeds the dynamic allowable moment is applied, it may damage the guide and shorten its service life. Please keep this in mind and select a push current that is safely within its limits.
Slider type
Tc:39.5 Tw:38.5
h dimension
Guide moment effective position
Calculation example)
When 200N push operation is performed with EC-S7 at the position shown in the figure at right, the moment applied to the guide is:
Ma = (22+50)×200 = 14400 (N•mm) = 14.4 (N•m).
The dynamic allowable moment for EC-S7 is Ma = 17.7 (N•m), which means it is OK
since 17.7 > 14.4.
Also, should an Mb moment occur due to the push operation, calculate the moment from the overhang and ensure that it is within range of the dynamic allowable moment.
65Reference Data
80
20 30
Current limit value (%)
* During push motion, the speed is fixed to 20 mm/s. If the velocity setting value (V) is less than 20 mm/s, the speed setting of V is used for the push speed but the push force will be unstable.
Slider type
S6 22 S7 22
S6£H 50.5 S7£H 58
200N
Mini table type TC4 10.5 TW4 10.5
*Unit: mm
50mm
h
Push force (N) Push force (N)
h
Push force (N) Push force (N)