FEC AFC1100 - Manual (Page 4)

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8.2 Basic operational tests
WARNING: Follow Lockout/Tagout and other safety precautions when connecting or
disconnecting cabling, wiring, and equipment. When performing the
following inspections, verify that the System is disabled prior to touching any
moveable components.
8.2.1 Torque transducer.
The system can perform a transducer check before each fastening cycle, comparing the
values from the torque transducer (zero and calibration) to the data stored in the system
memory. The system is maintenance free, however it is important to check it occasionally as
follows :
{ 1. Be sure that the nutrunner is in the READY mode.
{ 2. Check that the torque display shows 0 when the Axis unit RESET button is being
pressed.
{ 3. At the same time as 2 (above), check that the ACCEPT LED is lit.
{ 4. Check that the display is showing the full scale torque value when the Axis unit CAL
button is being pressed.
{ 5. At the same time as 4 (above), check that the ACCEPT LED is lit.
{ 6. If for any reason the accuracy of the tool transducer is in question, the transducer should
be calibrated in accordance with Section 7.4.
NOTE1: If the Zero and/or Cal check results in an "ABNORMAL" LED output to the Axis Unit
(and/or an illuminated "REJECT" light on the Axis unit), refer to Chapter 9.
8.2.2 Encoder.
Take the following steps to inspect the encoder:
{ 1. Make sure that the system will not be started up by the PLC (use the manual mode).
{ 2. Place the Axis unit into the real-time display mode (Chapter 7). The [D-NO] display
must be set to [ 2] using the [MODE] key in order to see the angle of rotation on the
ANGL/SPNO display.
{ 3. If the socket of the tool is turned clockwise direction, the angle indication should
increase.
{ 4. Verify that the angle of rotation matches the indicated angle.
8.2.3 Motor.
To check the motor, measure the winding's resistance and the isolation resistance.
{ 1. Disconnect the motor connector from the tool assembly.
{ 2. Measure the resistance between windings. (Refer to Fig 8-2-3)
{ 3. Measure the isolation resistance between each pair and the frame.
Insulation resistance: Using a megohmmeter, 500 VDC, 50 Mohms or more, test the
insulation resistance between the motor windings and the motor case. The values should
register in excess of 50 Mohms for each winding.
WARNING: Follow Lockout/Tagout and other safety precautions when connecting or
Chapter 8: Maintenance and Inspection (Rev. 8/98)
Page 8-4