FEC AFC1100 - Manual (Page 4)

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{ Preamplifier
Quality control of the tool torque transducer is accomplished electrically (digitally)
through the EEPROM in the preamplifier. During factory setup of the torque transducer,
the unit is Dead Weight and Dynamically tested against Standards that are certified and
traceable to the National Institute of Standards and Technology. The resultant data is
then programmed into the preamplifier. The AFC1100 System compares the
programmed data with the actual measured data from the transducer, and then
compensates for minor discrepancies. If the variance exceeds the specified limits, an
Abnormal output will be generated and the fastening process will be interrupted.
{ Servo Amplifier (Servo Drive)
Reduced equipment size with improved drive circuit strength is the result of
incorporating Isolated Gate Bipolar Transistor (IGBT) technology into the System. Axis
units are available in several models. The Servo Amplifier housed in each Axis unit
determines the model type. The Servo Amplifier also dictates the nutrunner (tool)
models that can be supported by the Axis unit. The AFC1100 System and the AFC1200
System both incorporate the same Servo Amplifier and nutrunner components.
{ Self-Check Function
The Self Check can be disabled by external PLC signals. If the self check signal is
"high" (inactive) before the cycle starts, the check is done automatically. The zero
voltage level of torque transducer and CAL voltage level are verified. When the torque
transducer's automatic check is not required, this function can be disabled by activating
the SELF CHECK signal before the cycle starts. The fastening cycle will be performed
without the self check.
The zero voltage check is done at the 40 msec interval (A) and CAL check (CAL
voltage) is done at the 40 msec interval of B. To get the Zero and CAL values, the
system measures the voltage
level 40 times during the A
(zero) and B (CAL) periods,
and calculates and average for
each. The system compares
these data to the
corresponding data contained
in the preamplifier's EEPROM
and decides if the torque
transducer condition is good or
bad .
{ Reject / Abnormal Condition
Display
When a fastening Reject has
occurred, the tool stops,
outputs the appropriate signal
and displays the resultant data on the Axis unit front panel. The unit will not require
resetting prior to the next cycle.
The System will output an Abnormal signal when it detects there is a problem (Zero
Check out of limits, incorrect component connection, etc.) within the System itself. The
output will be displayed as a code on the affected Axis unit. Refer to Chapter 9
Troubleshooting for more details. Manual reset of the system will be required.
Chapter 1: Outline (Rev. 8/98)
Page 1-4
40ms 60ms 40ms
CAL TQ
ZERO TQ
TQ
TIME
B A