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Technical Instructions
Fig. 9
Free speed
A reduced free speed implies an improved accuracy and an
increased number of pulses per tightening.
A reduced free speed may effect the torque level installed and the
tightening time.
When the free speed has been reduced the number of pulses has
increased as well as the torque level. After a reduction of the free
speed the torque level might have to be reduced, see fig.8 and 9.
Fig. 10
Type of joint (Hard or Soft)
The tightening time (i.e. the number of pulses per tightening) is
depending on joint hardness. Hard joints gives short and soft joint
longer operation time, see fig.
Max. recommended tightening time is 3 seconds.
Min. recommended number of pulses per tightening is 3.
An increased number of pulses per tightening implies an improved
accuracy. Fewer pulses per tightening implies an increased scatter.
Fig. 11
Operating area
Max. recommended tightening time is 3 seconds. Longer time
indicates that the joint is too soft for the machine used. If so it is
recommended to choose a bigger size of machine or another type of
nutrunner.
Min. recommended number of pulses per tightening is 3.
Few pulses per tightening at a low setting indicates that the free
speed ought to be reduced by the trim valve.
Trouble shooting
Fault
The preset torque is decreasing and the
pulse frequency is slightly increasing
The machine does not reach the
expected torque
The machine does not shut off
Pulse frequency too low or too high
Accuracy not as good as expected
26
Cause
Low oil level in the pulse unit ?
Too soft joint ?
The yield point of the joint's screw
has been reached ?
Air pressure at the machine too low ?
Torque adjusting screw is set in a
too deep position ?
Stop pin (Ref.No.157) is not correctly
adjusted ?
Incorrect oil volume in pulse unit ?
Too soft joint ?
Too low rotary speed ?
Incorrect oil volume in pulse unit ?
Very hard joint and min. torque setting ?
Too soft joint and max. torque setting ?
Stop pin (Ref.No.157) is not correctly
adjusted ?
Atlas Copco Tools - No. 9836 1621 00
Torque
Adjusted
actual
torque
Torque
Hard joint
No. of pulses per tightening / Time
Max.
setting
Operating area
Reduced
free speed
by Trim valve
Min.
setting
Hard joint
Tightening angle ≈ 45˚
Remedy
Refill oil according to fig. 12, op 5 - 10
See fig.11, Operating area. A bigger machine ?
Check the torque adjustment and the joint's
screw quality
Check the dimension of the hose and
coupling, increase air pressure
Adjust counter clockwise until the shut off is
distinct
Adjust according to the instructions, fig. 13
Refill oil according to fig. 12
Choose a bigger machine
Check the Trim valve setting,
check the vane motor assembly
Refill oil according to fig. 12
Lower free speed by the Trim valve,
see fig. 11 Operating area and fig. 8
Check the Trim valve setting. Choose a bigger
machine,see fig. 11 Operating area to the
instructions, fig. 13
EP 14PTS-HR20
Free speed
(% of max.)
Increasing
accuracy /
Time
Soft joint
Max. free
speed
Soft joint
Tightening angle ≈ 300˚
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