FEC AFC1500 - Manual (Page 88)

Chapter 6: Fastening Instructions
Page 6-2
6.1 Fastening Control.
The AFC1500 is user programmable to select from two different fastening methods, referred
to as Torque Control and Angle Control methods. For a stand alone SAN Unit operation,
each control method can be performed in 1 to 3 incremental steps, which will successively
secure the fastener to the specified torque or angle values. With the addition of a Multi Unit,
fastening can be performed in up to 3-steps and performed multiple times, making the num-
ber of steps almost limitless.
NOTE: All setting recommendations are based upon common fastening applications.
Applications that experience high Prevailing torque, excessive joint compression or
other unique characteristics must be set with these characteristics in mind.
6.1.1 Torque Control Method.
In Torque Control method, fastening is performed based upon attaining a desired torque val-
ue within one to three incremental steps, while monitoring the degrees of rotation (Angle) of
the fastener and time. Additional monitor items (limits) can be set to enhance the systems
ability to determine if the fastener was properly secured (Section 6.2).
{ { { { One-Step Fastening
P One-step fastening will be used primarily for joints which have no requirement to synchronize with
another spindle during the final stage of the rundown. Examples: Pipe Plugs, Spark Plugs, single
spindle applications.
1. Once SPEED CHANGE TORQUE is reached or FREERUN REVOLUTIONS expires, the sys-
tem will switch from FREERUN SPEED to SLOWDOWN SPEED and continue to fasten to
1ST TORQUE.
2. The system will fasten to the 1ST TORQUE value during the specified 1ST TIME. 1ST
TORQUE must be reached within the 1ST TIME limits or a reject will occur.
3. Upon reaching 1ST TORQUE, 1ST TIME ends and FINAL TIME begins. 1ST TORQUE is
the shift point to TORQUE SPEED.
4. The system will fasten to STANDARD TORQUE using TORQUE SPEED during FINAL TIME.
STANDARD TORQUE must be reached within the FINAL TIME limits or a reject will occur.
FUNCTION RECOMMENDATION / COMMENT
SPEED CHANGE TORQUE 10% of STANDARD TORQUE
THRESHOLD TORQUE Start point of 1
st
torque rate monitoring (section 6.2)
1ST TORQUE
30% of STANDARD TORQUE
Used for RATE/TIME settings and TORQUE SPEED initiation.
SNUG TORQUE Angle Monitoring Start Point (section 6.2)
CROSSOVER TORQUE Start point of 3
RD
torque rate monitoring (section 6.2)
STANDARD TORQUE Engineered product fastening specification
1ST TIME HIGH/LOW LIMIT Acceptance range to reach 1ST TORQUE setting
FINAL TIME HIGH/LOW LIMIT
Acceptance range to go from 1ST TORQUE to STANDARD
TORQUE