Power Jacks S-Series - Manual (Page 3)

3
Sym-metric Series – Screw Jacks
2 Performance Ratings
2.1 Performance of Standard Sym-metric Screw Jacks
Actuator Model ST025 ST050 ST100 ST200
Capacity (kN) 25 50 100 200
Lifting Screw
Diameter Ш30 Ш40 Ш50 Ш65
Pitch
6 mm 9 mm 12 mm 12 mm
No of Starts* 1 2 1 2 1 2 1 2
Worm Gear Ratios
Standard 6:1 6:1 8:1 8:1
Option 1
8:1 8:1 6:1 6:1
Option 2 24:1 24:1 24:1 24:1
Turn of worm for
raise of lifting screw
1 Turn Standard 1mm 2mm 1.5mm 3mm 1.5mm 3mm 1.5mm 3mm
4 Turn Option 1 3mm 6mm 4.5mm 9mm 8mm 16mm 8mm 16mm
4 Turn Option 2 1mm 2mm 1.5mm 3mm 2mm 4mm 2mm 4mm
Maximum Input Power per
Actuator (kW)
Standard 1.5 3.0 3.75 3.75
Option 1 1.5 3.0 3.75 3.75
Option 2 0.375 0.550 1.125 1.125
Start-Up Torque
at full Load (Nm) †
Standard 19 26 54 73 111 151 252 330
Option 1 15 20 44 59 140 190 317 416
Option 2 8 11 24 33 57 77 129 168
Weight with base raise of 150mm (kg) 13 25 41 70
Weight for each additional 25mm raise (kg) 0.21 0.32 0.57 0.86
*
Single start lifting screw is standard.
† For loads of 25% to 100% of actuator capacity, torque requirements are approximately proportional to the load.
2.2 Sym-metric Screw Jack Efficiencies
Model Gear Ratio Lifting
Screw Start
Static Input Speed
Zero rpm
Dynamic Input Speed (rpm)
50 750 1000 1500
ST025
6:1
1 0.209 0.262 0.299 0.302 0.309
2 0.314 0.379 0.434 0.438 0.448
8:1
1 0.194 0.247 0.288 0.293 0.301
2 0.293 0.358 0.418 0.424 0.436
24:1
1 0.121 0.164 0.220 0.226 0.239
2 0.183 0.238 0.320 0.328 0.347
ST050
6:1
1 0.222 0.281 0.324 0.329 0.337
2 0.325 0.398 0.460 0.466 0.477
8:1
1 0.206 0.264 0.312 0.318 0.328
2 0.302 0.374 0.442 0.451 0.465
24:1
1 0.125 0.171 0.238 0.246 0.263
2 0.184 0.242 0.337 0.349 0.372
ST100
6:1
1 0.227 0.285 0.324 0.329 0.336
2 0.336 0.407 0.462 0.469 0.479
8:1
1 0.214 0.272 0.315 0.320 0.328
2 0.317 0.389 0.450 0.456 0.468
24:1
1 0.140 0.188 0.252 0.260 0.274
2 0.207 0.269 0.359 0.370 0.391
ST200
6:1
1 0.201 0.255 0.289 0.294 0.300
2 0.307 0.375 0.426 0.432 0.442
8:1
1 0.190 0.243 0.282 0.286 0.293
2 0.290 0.358 0.415 0.421 0.431
24:1
1 0.124 0.168 0.225 0.232 0.245
2 0.189 0.248 0.331 0.341 0.361
Note Values for standard oil lubricated Sym-metric actuators only, ref: BS 721 part 2. with grease lubricated lifting screw