Technical Data 　Linear actuator 　Power Cylinder Selection

Selection ：U Series

Conditions required for selection

Machine to be used and application

Thrust or load N{kgf}

Stroke mm

Speed mm/s

Frequency of use 　cycles /min

Hours of operation per day, and number of operating days per year

Type of load of machine used

Operating environment

Supply voltage 、Frequency

Selection procedure

Determination of model STEP1

Determine the type (UB or UC) according to the application and operation method.

Determination of model No. STEP2

  • (1) Calculate annual traveling distance from the stroke, frequency of operation and hours of operation.

    Annual traveling distance km = Actual stroke m×Frequency of use  /day ×Number of operating days / year ×10-3

  • (2) Calculate the operation factor from the characteristics of load and the machine used, referring to Table 1.
  • (3) Multiply thrust or load by operation factor to obtain a corrected thrust.
  • (4) Determine the frame No. from the “Expected Traveling Distance” shown below on this page according to the corrected thrust and annual traveling distance, and select an applicable model from the standard model list (click here) based on the stroke, speed, power supply voltage and frequency.

Table 1 Service factor

Load characteristics Example of machine used Service factor
Smooth operation without impact
Low inertia 		Damper, opening/closing of valve
Conveyor switching device 		1.0～1.3
Operation with light impact
Medium inertia 		Opening/closing of hopper gate, various transfer equipment, various lifter elevation 1.3～1.5
Operation with large impact/vibration
High inertia 		Heavy object conveyance by carriage, buffer for belt conveyor, inversion opening/closing device for large lid 1.5～3.0

Note )The above operation factor table shows general guidelines, and please apply the appropriate factor depending on actual condition.

Characteristics check STEP3

  • (1) Use the Power Cylinder within a frequency of operation below (Table 2).
  • (2) Check the load time ratio.
  • (3) Check the coasting distance and stop accuracy in Table 3 below.

Table 2 Allowable frequency of operation

Series name/type LPUB・LPUC
Motor Capacity (kW) 0.75 1.5 2.2 3.7 5.5 7.5 11 15
Thrust ・Speed 6000S 6000L 6000M 6000H
8000S 8000L 8000M 8000H
12000L 12000M 12000H
16000L 16000M 16000H
22000L 22000M 22000H
32000L 32000M 32000H
50000L 50000M 50000H
cycles (Number of times/min ) 4 4 4 4 3 3 2 2
Percentage duty cycle (%ED) 25%ED

Note) The above frequencies of operation are values determined by heat generation of the motor. They are not values taking life of the cylinder body into consideration.

Allowable frequency of operation for the Power Cylinder U series is within a range which satisfies the number of starting times and load time ratio in the above table. The load time ratio is expressed by the following equation.

Percentage duty cycle (%ED) = Operation time of one cycle Operation time of one cycle + stop time ×100%

Table 3 Coasting distance and stop accuracy (Reference )

Units ：mm
Installation method Brake internal connection Brake external connection ※
Lifting load Suspended load Lifting load Suspended load
Model No. Coasting distance Stopping Precision Coasting distance Stopping Precision Coasting distance Stopping Precision Coasting distance Stopping Precision
LPUB6000
LPUC6000 		S 0.6 ±0.2 0.8 ±0.2 0.5 ±0.1 0.6 ±0.1
L 2.7 ±0.6 4.4 ±1.2 1.8 ±0.4 3.4 ±0.9
M 4.5 ±1.0 7.4 ±2.0 2.7 ±0.5 5.5 ±1.5
H 7.6 ±1.7 12.2 ±3.2 4.6 ±0.9 9.0 ±2.4
LPUB8000
LPUC8000 		S 1.9 ±0.4 2.9 ±0.7 1.3 ±0.2 2.2 ±0.5
L 3.6 ±0.8 5.8 ±1.6 2.2 ±0.4 4.3 ±1.1
M 5.6 ±1.2 8.4 ±2.1 3.4 ±0.7 6.1 ±1.5
H － － － － 5.4 ±1.0 8.7 ±2.0
LPUB12000
LPUC12000 		L 2.1 ±0.5 3.0 ±0.8 1.3 ±0.2 2.2 ±0.5
M 3.5 ±0.8 5.1 ±1.3 2.1 ±0.4 3.6 ±0.9
H － － － － 3.6 ±0.7 5.9 ±1.4
LPUB16000
LPUC16000 		L 2.8 ±0.6 4.0 ±1.0 1.7 ±0.3 2.8 ±0.7
M － － － － 2.6 ±0.5 4.0 ±0.9
H － － － － 3.9 ±0.7 8.6 ±2.4
LPUB22000
LPUC22000 		L － － － － 1.3 ±0.3 2.0 ±0.4
M － － － － 2.0 ±0.4 4.2 ±1.0
H － － － － 2.7 ±0.5 4.4 ±1.1
LPUB32000
LPUC32000 		L － － － － 1.3 ±0.3 2.0 ±0.4
M － － － － 2.0 ±0.4 4.2 ±1.0
H － － － － 2.7 ±0.5 4.4 ±1.1
LPUB50000
LPUC50000 		L － － － － 1.3 ±0.3 2.0 ±0.4
M － － － － 2.0 ±0.4 4.2 ±1.0
H － － － － 2.7 ±0.5 4.4 ±1.1

※Click here for the wiring of the brake external connection.

Type of load

Lifting load

Lifting load

Suspended load

Suspended load

Vertical operation

Note) Anti-rod rotation is required for actual operation.

Coasting distance ：This indicates a distance from a time when the limit switch or the stop button is operated until the cylinder stops. This coasting distance varies depending on how the load is applied and the operation circuit.

Stopping Precision ：This indicates variation of the stop position when stop is repeated.

Guide for life

Use the traveling distance of the cylinder (nut) as guide to select the Power Cylinder U series with expected life.

Traveling distance of cylinder (nut)

The life of a ball screw is determined by flaking of the rolling surface caused by its fatigue. Check the rough life with this chart of expected traveling distance.
However, in case of great impact or where lubrication or maintenance is not performed properly, the expected traveling distance becomes substantially shorter.

Expected traveling distance (km) = Actual load stroke (m)×Frequency of use (/day )×Number of operating days / year ×10-3×Expected number of years

The chart on the right-hand side is based on L10 life. L10 life expresses in traveling distance a life that can be reached by 90% or more of all ball screws. If you select a power cylinder based on the life, select model No. from this chart.

If the load greatly fluctuates in the middle of stroke, calculate the equivalent load (PM) by the following formula.

PM = PMIN + 2×PMAX 3

PM：Equivalent load N{kgf}

PMIN：Minimum load N{kgf}

PMAX：Maximum load N{kgf}

For further expected traveling distance, please consider the N version (click here).

Expected traveling distance

Expected traveling distance

Selection example

Operation method ：Hopper gate open/close (Stop at middle two points, press and stop at extend limit and retract limit )

Required thrust ：41.2kN{4200kgf}

Stroke ：1000mm

Speed ：1000mm/s in approximately 45 seconds

Frequency of use ：One reciprocation/60 minutes (1 reciprocation/hour )

Operating hours ：8 hours/day, 250 days operation/year  Durable years approximately 5 years

Load characteristics ：Operation with light impact, loaded when extend and retract

Operating environment ：Outdoor installation, dusty, temperature 0℃ to 35℃

Power Supply ：220V 60Hz

Determination of type

With press and stop, internal stop → Select C type

Determination of model No.

  • 1.Service factor ：1.3
  • 2.Corrected thrust ：41.2kN{4200kgf}×1.3 = 53.6kN{5460kgf}
  • 3.Model No. ： LPUC 6000 L10 K2 J

    K2...Stop at two middle points

    J......With Bellows (Much dust )

Characteristics check

  • 1.cycles
    • cycles ：2 times/60min＜4 times/min
    • Percentage duty cycle ：
      1000mm 22mm/sec ※ ×2 times (1 reciprocation) 60 min ×60sec  ×100 = 2.5% < 25%

      ※Speed calculation 　1000mm / 45sec = 22mm / sec

  • 2.Number of total press (pull) stop times：2 times/1 reciprocation, durable years: 5 years (250 days/year)
    • 2×1×8×250×5＝2 x 104 times＜10 x 104 times

Life check

  • 1.Annual traveling distance ：1.0×2×1 time /Time ×8 hours / day ×250 days / year ×10-3 = 4km
  • 2.Expected traveling life ：4km×5 years = 20km
  • 3.Equivalent load ：PM = 53.6 + 2×53.6 3 = 53.6kN{5460kgf}

※This calculated value satisfies the expected traveling life of LPUC 6000 according to the above load-expected traveling life diagram.

Cautions for selecting ：U Series

Brake holding force

Load holding force while the Power Cylinder U series stops is more than the rated thrust, therefore, power cylinder can hold the load more than rated thrust. This holding force is generated by brake motor. The brake is of a spring braking type that performs braking operation by spring force during stoppage, and brake torque has 150% or more of the motor rated torque.

※Select a power cylinder of a sufficient thrust, allowing for a safety rate so that the loads used (static and dynamic) do not exceed the rated thrust.

Stoppage by Brake

This method operates and stops the brake by the limit switch or operation of the stop button, and allows for positioning on multi-stages such as the upper limit, lower limit and middle of the stroke. Coasting distance and stop accuracy vary depending on operating speed and load.

When accurate positioning is required, or operation speed is high, brake individual turnoff is recommended. Take coasting distance to set the limit switch position and the output stop signal.

Reference values are shown in Table 3 above.

Allowable number of pressing stops for C type

When push/pull stopping at high frequency

When using the Power Cylinder at a frequency of ten or more times a day, refer to the total stop times for every type in the following table.

Type LPUC6000～LPUC32000
Speed S,L M H
Reference total stop numbers (×104 times） 10 3 ※
  • Note)
    1.When the Power Cylinder is used for push (pull) stopping, brake external wiring is recommended.
  • 2.When the Power Cylinder is used more frequent turn in above table, it is recommended to stop with the stroke adjusting LS.
  • 3.When the Power Cylinder is used with press (pull) stop, strength of the mating equipment shall be 250% or more of the rated thrust.
  • 4.When the power cylinder is stopped, use an inverter to decelerate.
    　※Since life is affected by the amount of deflection of the disk spring, the more it is decelerated, the more the standard total number of stops can be increased.
    　Example: If the power cylinder is used at H speed, the standard total number of stops is up to 100,000 stops if it is stopped at a speed equivalent to S speed.Contact us for details.
  • 5.UC50000 cannot use the push (pull) stop in permanent use.

Allowable mass for horizontal drive

The safety device will not work at the start for opening/closing of the damper or the hopper gate, normal reverse, inclination and elevation, however, when a load inertia is large due to horizontal movement of carriage, the safety device may work to impair smooth operation at the start. For the allowable mass m of each model, see Table 4.

Allowable mass for horizontal drive
  • Trolley mass ：mkg
  • Coefficient of friction ：μ
  • Trolley traveling resistance ：= μm ≦ Rated Thrust

Table 4 Allowable mass m

Units ：kg
Power cylinder model LPUB6000
LPUC6000		 LPUB8000
LPUC8000		 LPUB12000
LPUC12000		 LPUB16000
LPUC16000		 LPUB22000
LPUC22000		 LPUB32000
LPUC32000		 LPUB50000
LPUC50000
Speed L 42000 51000 170000 204000 305000 680000 960000
M 35000 40000 123000 160000 230000 490000 1080000
H 25000 32000 74000 100000 307000 670000 720000

Note) No consideration required at low (s) speed.

Multiple operation

As shown in Fig. 1, transfer or elevation can be carried out by sharing load on multiple power cylinders with less speed fluctuation due to variation in load.

For selection, please read carefully on the right.

Fig. 1 Linkage operation by multiple power cylinders

Multiple operation

Control method

Turn on the power for all of the cylinders at same time, and stop with the limit switches installed on each power cylinder. Avoid using a single limit switch to control all of cylinders, as this will result in a cumulative error in stroke.

Accuracy

Variation in speed of each power cylinder during operation is generated due to variation in load, and is generally approximately 5%. For variation at stop, refer to the stop accuracy in Table 3 above. When synchronizing power cylinders, use the multi-series.

Thrust per one cylinder Required thrust N{kgf} Number of power cylinders to be used ×Multiple factor

Table 5 Multiple factor

Number of power cylinders to be used 2 cylinders 3 cylinders 4 cylinders 5 cylinders 6 cylinders
Multiple factor 0.8 0.7 0.6 0.55 0.5
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