FEC MICRO NR - Manual (Page 62)

Chapter 6: Fastening Instructions
Page 6-6
6.2 Speed Functions
The Micro NR System is user-programmable for operations involving multiple speed settings. The
use of multiple speeds during the fastening process aids in socket engagement, achieving cycle
time and controlling the applied torque during all stages. Special conditions that affect these
operations will be identified in the appropriate section.
1. Fastening Initial stage to seating process:
a. The system starts off running at INITIAL SPEED for the period specified by INITIAL
TIME. This segment is intended to be used for initial fastener engagement.
b. Upon completion of INITIAL TIME the system switches to FREERUN SPEED for the
period specified by FREERUN REVOLUTIONS or FREERUN TIME. The number of
revolutions or the set time required to complete INITIAL TIME will be deducted from
the number of revolutions run or amount of time at FREERUN SPEED.
c. Once FREERUN REVOLUTIONS or FREERUN TIME expires, the system will switch
from FREERUN SPEED to SLOWDOWN SPEED and continue to fasten until
reaching SPEED CHANGE TORQUE. SLOW DOWN SPEED is intended to provide
a slower, more controlled speed to seat the fastener.
2. Once SPEED CHANGE TORQUE is reached, the system will switch from FREERUN SPEED
or SLOWDOWN SPEED to TORQUE SPEED to continue fastening to STANDARD
TORQUE/ANGLE.
FUNCTION RECOMMENDATION
60: FREERUN REVOLUTIONS
For joints that do not react properly to high speed seating, the
Freerun Revolutions should be set to end prior to the fastener
seating.
41: FREERUN TIME
For joints that do not react properly to high speed seating, the
Freerun Time should be set to end prior to the fastener seating.
51: FREERUN SPEED
Set based upon cycle time requirements. This speed is used to
run down the bolt quickly.
40: INITIAL TIME
Set to a duration which will provide sufficient time for the socket to
engage the fastener. Set in seconds.
50: INITIAL SPEED
Set to the RPM which will allow for easy socket to fastener
engagement.
52: SLOW DOWN SPEED
Seating speed. Set based upon the joint type to allow for a
controlled seating.
14: SPEED CHANGE TORQUE
The tool speed shifts to TORQUE SPEED when the torque
monitor senses this torque value.
53: TORQUE SPEED
Final torque speed to which the nutrunner will shift once SPEED
CHANGE TORQUE is reached. Set based upon the joint type to
allow for a controlled final fastening. LESS THAN 50 RPM.
54: REVERSE SPEED
Speed used to reverse or back-out a fastener. Typically ¼ of full
speed.