How to optimize the performance of your EP/EPP tool
Recommended number of pulses
A pulse tool well suited for your application should reach the
target torque (with shut off) within 5-20 pulses.
The number of pulses can be measured with a IRTT and ACTA analyser.
The tightening time can also be used as a guide
to know if the tool is appropriate or not for your application:
≤ 1 sec. for tools up to 30Nm
≈1 sec. for tools up to 80Nm
≈2 sec. for tools up to 150Nm
≈5 sec. for tools up to 450Nm
≤ 10 sec. for tools up to 850Nm
If the target torque is achieved with less than 5 pulses (=short tightening time), the torque scatter will increase and it can be difficult to adjust to the right level, especially on hard joints.
If the target torque is achived with more than 20 pulses (=too long tightening time) the wear will increase and more frequent oil filling and service will be required. Too long tightening time, in combination with high production rate, may also result in excessive heating of the oil. In that condition the power will decrease with even longer tightening time and perhaps no shut off.
If the target torque is achieved with less than 5 pulses adress this issue by:
Decreasing the air pressure.
Reducing the speed by means of the AT or Trim valve.
If these measures are not possible or does not give acceptable results, a smaller tool can be a better choice.
If the target torque is achieved with more than 20 pulses adress this issue by:
Increasing the dynamic air pressure to 6-7 bar for standard EP tools or 5-6 bar for low pressure EP PTX-L tools.
Adjust the AT or Trim valve to give maximum power/speed.
If these measures are not possible or does not give acceptable results, a bigger tool can be a better choice.
If the air pressure has been changed the target torque must be measured again and adjusted if needed.
