TECHNICAL MANUAL FOR THE RDR BL3 - V1.1 DRIVE ROLLER Rev. 21/09/2018 page 13
POSSIBLE POLY-V BELTS AND ROLLER PITCHES
Reference printed
on belt
Roller pitch (pulley
Ø43) [mm]
Actual extent of belt at
rest [mm]
Poly-V belt, 2 or 3 ribs, PJ 256
Poly-V belt, 2 or 3 ribs, PJ 270
Poly-V belt, 2 or 3 ribs, PJ 282
Poly-V belt, 2 or 3 ribs, PJ 286
Poly-V belt, 2 or 3 ribs, PJ 288
Poly-V belt, 2 or 3 ribs, PJ 290
Poly-V belt, 2 or 3 ribs, PJ 314
Poly-V belt, 2 or 3 ribs, PJ 316
Poly-V belt, 2 or 3 ribs, PJ 336
Poly-V belt, 2 or 3 ribs, PJ 346
Poly-V belt, 2 or 3 ribs, PJ 356
Poly-V belt, 2 or 3 ribs, PJ 376
Poly-V belt, 2 or 3 ribs, PJ 388
Poly-V belt, 2 or 3 ribs, PJ 416
Poly-V belt, 2 or 3 ribs, PJ 442
Poly-V belt, 2 or 3 ribs, PJ 456
Poly-V belt, 2 or 3 ribs, PJ 486
Poly-V belt, 2 or 3 ribs, PJ 536
Warning the order code does not give the roller pitch. For permitted roller pitches, see the relevant column.
Warning the printed reference number on the belt (PJ-XXX) is not the extent and must not be used to calculate roller pitch.
The original winding diameter of the belt is calculated as 1 mm above the pulley: Dp = Ø pulley + 2 mm.
Recommended average tension 5%. Min/max permitted tension range 4-6%.
Torque transmitted by Poly-V belts with 4% min. pretensioning
Torque loss per transmission ring
Recommendations on fitting Drive Rollers
In roller conveyors provided with transmission systems with round straps or Poly-V belts, it is fundamental to install
the Drive Roller in a position that is central to the conveying area, with a similar number of driven rollers upstream
and downstream of the Drive Roller. If there is a precision stop or a significant package load, the Drive Roller can
be positioned as the first or second roller of the area, provided that the driven rollers on the other side are limited.
Technologically, the two different transmission systems ensure different performance with use restrictions.
If round straps are used, do not exceed the maximum number of 10 driven rollers connected to each Drive
Roller, and position the Drive Roller in the middle of the area.
If Poly-V belts are used, do not exceed the maximum number of 20 driven rollers connected to each Drive
Roller, and position the Drive Roller in the middle of the area.
The above quantities are maximum quantities for ensuring efficient transmission. If the above quantities are
exceeded, the decline in general performance may be considerable and may not ensure sufficient conveying
torque. These maximum numbers of driven rollers could be decreased, depending on the torque that can be
supplied by the different Drive Roller ratio reductions, depending on the loads to be conveyed and calculating the
torque required on the basis of the data specified above and the type of belt chosen.