FEC AFC1500 - Manual (Page 106)

Chapter 6: Fastening Instructions
Page 6-20
6.2.5 Time Monitoring
{ Time High Limits
As outlined in the Fastening Control Methods portion of this Chapter, this System is capable
of performing multiple-step fastening operations. The duration of each of these steps is go-
verned by one of two independent watchdog time settings. If the step fails to attain the de-
sired result before the completion of the specified time, a TIME HIGH reject condition will oc-
cur.
{ Time Low Limits
Low time limit settings for both 1st and Final steps are available for special applications. This
allows the setting of a low time limit which can be used to detect conditions in which the fas-
tening reaches a given point before it would have under normal conditions. Short bolts, short
threads, blind holes, cross threads, etc. are all conditions which may be detected with this
setting. Times under the low limit will produce a reject for that fastening.
1 Step Fastening
Function Start Point Stop Point Time Preset Limits
1ST STEP
START 1ST TORQUE 1ST TIME HIGH/LOW LIMIT
1ST TORQUE FASTENING END FINAL TIME HIGH/LOW LIMIT
1
st
TORQUE also serves as a shift point to TORQUE SPEED and the monitoring stop point for 1
st
TORQUE RATE. The system does not stop or synchronize at this point.
2 Step Fastening
Function Start Point Stop Point Time Preset Limits
1ST STEP START 1ST TORQUE 1ST TIME HIGH/LOW LIMIT
2ND STEP 1ST TORQUE FASTENING END FINAL TIME HIGH/LOW LIMIT
1 st TORQUE also serves as a shift point to TORQUE SPEED and the monitoring stop point for 1 st
TORQUE RATE. The system will temporarily stop at this point and can be set to synchronize with
other spindles.
3 Step Fastening
Function Start Point Stop Point Time Preset Limits
1ST STEP START 1ST TORQUE 1ST TIME HIGH/LOW LIMIT
1
st
TORQUE also serves as a shift point to TORQUE SPEED and the monitoring stop point for 1
st
TORQUE RATE. The system will temporarily stop at this point and can be set to synchronize with
other spindles.
2ND STEP 1ST TORQUE CROSSOVER TORQUE
FINAL TIME HIGH/LOW LIMIT
3RD STEP CROSSOVER TORQUE FASTENING END
For 3 Step Fastening, 2
ND
STEP and 3
RD
STEP are performed with the same preset FINAL TIME
HIGH/LOW LIMITS. (both must finish within the same combined timeframe)
When the system is configured with a MULTI UNIT, additional operations/functions that can be per-
formed via the Sequence Programming features are not included in the calculation of 1ST TIME and
FINAL TIME. Examples of these items include: Reverse commands, Time Delays between steps, or
any other items that do not happen directly as a result of initiating a 1st, 2nd, or 3rd Step command.