Operators manual for the Pentruder 8 – 20HF IQ and Pentpak 427
Page 24
Tractive Support
Torque and spindle speed in rpm
Independent of what size blade is needed, the 4-speed gearbox allows the Pentruder 8-20 HF IQ to
work with a remarkably high torque at all spindle speeds.
Spindle RPM
Torque
Nm
on the
spindle
100
200
300
400
500
1200
400
800
600
1000
1:st gear
350 Hz = Potentiometer at 80%
400 Hz = Potentiometer at 90%
440 Hz = Potentiometer at 100%
2:nd gear
3:rd gear
4:th gear
Graph shows torque for a
fictive, not Tractive, wall saw
without a multi step
gearbox. Torque is constant
up to 950 rpm. Power is
proportional to rpm.
Unfortunately, if rpm is
halved, output in kW is also
halved.
kW = Torque in Nm*RPM
9550 (constant)
With a gearbox, the motor
can always work within its
optimum speed range, and
power is more or less
constant.
Torque depending on gear and spindle speed for Pentpak 8-20 HF IQ in comparison
to fictive wall saw without multi step gearbox
