FEC AFC3000 - Page 172

Chapter 7 Fastening Instructions
PAGE 7-5
<Torque Control Method・
・・
・Two-step Fastening>
P Two-step fastening will be used primarily for joints that have a requirement to synchronize with
another spindle during the final stage of the rundown or require joint conditioning. Examples:
Connecting Rod, Main Bearing Cap, any multiple-spindle application.
1. Once RAMP DOWN START TORQUE is reached or FREERUN REVOLUTIONS expires,
the system will switch from FREERUN SPEED to 1ST SPEED and continue to fasten to 1ST
TORQUE/ANGLE.
2. The system will fasten to the 1ST TORQUE/ANGLE value during the specified 1ST TIME.
1ST TORQUE/ANGLE must be reached within the 1ST TIME limits or a reject will occur.
3. Upon reaching 1ST TORQUE/ANGLE, 1ST TIME ends and 2ND TIME begins. 1ST
TORQUE/ANGLE is the shift point to 2ND SPEED and the synchronization point prior to
commencing the next step.
4. Upon reaching 2ND TORQUE/ANGLE the system with shift to 3RD SPEED. The system will
then fasten to STANDARD TORQUE. STANDARD TORQUE must be reached within the
2ND TIME limits or a reject will occur.
Fastening Parameter
Function
Ramp Down
Start Torque
Set this torque 10% of the Standard Torque or 30% of SNUG Torque.
Set the value right before fastener seating.
1
ST
Torque
1
ST
Angle
Set this torque 30% of the Standard Torque or 80% of SNUG Torque.
1
st
Time end point, 2
nd
Speed start point
and synchronization point for the
2
nd
step.
SNUG Torque
Used for angle measurement start point.
Set the value when the torque increase is stable (after fastener seating).
2
ND
Torque
2
ND
Angle
Set this torque 60% of the Standard Torque
Used for 3
rd
speed start point.
Standard Torque Engineered product fastening specification
1
ST
Time High Limit
1
ST
Time Low Limit
The high and low limits from starting the fastening to detecting 1
st
Torque
or 1
st
Angle.
2
ND
Time High Limit
2
ND
Time Low Limit
The high and low limits from detecting 1
st
Torque or 1
st
Angle to detecting
the Standard Torque.
Two
-
step Fastening
Function
Start Point Stop Point
Range of the duration of
fastening
1
st
Step Start of operation 1
st
Torque / 1
st
Angle 1
st
Time Low Limit / High Limit
2
nd
Step 1
st
Torque / 1
st
Angle Standard Torque 2
nd
Time Low Limit / High Limit
※ Stop temporarily when 1
st
Torque or 1
st
Angle is detected. Enable to set to synchronize
with
other spindles.