FEC AFC1500 - Manual (Page 107)

FEC AFC1500 Operations Manual Chapter 6: Fastening Instructions (Rev. 6: 10/09)
Page 6-21
6.3 Speed Functions
The AFC1500 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. Speed functions work the same for Torque Con-
trol and Angle control, using any of the previously stated standard monitoring function. Special condi-
tions that affect these operations will be identified in the appropriate section.
1. The system will fasten to the 1ST TORQUE/ANGLE value during the specified 1ST TIME.
During 1ST time the following steps occur:
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. The number of revolutions required
to complete INITIAL TIME will be deducted from the number of revolutions run at
FREERUN SPEED.
c. Once SPEED CHANGE TORQUE is reached or FREERUN REVOLUTIONS expires,
the system will switch from FREERUN SPEED to SLOWDOWN SPEED and continue
to fasten until 1ST TORQUE/ANGLE is attained or the 1ST TIME HIGH LIMIT (1ST
time reject) is reached. SLOW DOWN SPEED is intended to provide a slower, more
controlled speed to seat the fastener.
2. Upon reaching 1ST TORQUE/ANGLE, 1ST TIME ends and FINAL TIME begins. 1ST
TORQUE/ANGLE is the shift point to TORQUE SPEED and the synchronization point prior to
commencing the next step. (See 4.7.6 for Standalone Sync. info).
3. For a 2 step fastening, the system will fasten to STANDARD TORQUE/ANGLE, using
TORQUE SPEED during FINAL TIME. STANDARD TORQUE/ANGLE must be reached
within the FINAL TIME limits or a reject will occur.
4. For a 3 step fastening, the system will fasten to CROSSOVER TORQUE/ANGLE, synchron-
ize with other spindles and than fasten to STANDARD TORQUE/ANGLE using TORQUE
SPEED during FINAL TIME. STANDARD TORQUE/ANGLE must be reached within the
FINAL TIME limits or a reject will occur.
FUNCTION RECOMMENDATION
INITIAL TIME Set to a duration which will provide sufficient time for the socket to en-
gage the fastener. Set in seconds.
INITIAL SPEED Set to the rpm which will allow for easy socket to fastener engagement.
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.
FREERUN SPEED Set based upon cycle time requirements. This speed is used to run
down the bolt quickly.
SLOW DOWN SPEED First torque fastening speed. SET based upon the joint type to allow
for a controlled seating. LESS THAN 200 RPM.
TORQUE SPEED Final torque speed to which the nutrunner will shift once 1st TORQUE
is reached. SET based upon the joint type to allow for a controlled final
fastening. LESS THAN 50 RPM.
REVERSE SPEED Speed used to reverse or back - out a fastener. Typically ¼ of full
speed. Additional reverse functions exist when a MULTI unit is used.
NOTE: If CROSSOVER TORQUE is set between 95 – 100% of STANDARD TORQUE, TORQUE
SPEED automatically drops to 3RPM when CROSSOVER TORQUE is reached. It is not rec-
ommended that this functions or settings be used in “soft joint” applications or overload ab-
normals may result.