User guide
9.4.2 Cal Check Abnormal (Axis Unit display code "A1")
<ERROR DESCRIPTION>
The Calibration (Cal) level of the tool transducer is outside of the acceptable limits. The
following table details the limits of the check for various equipment conditions.
If the Cal level is not sequence-initiated, the System
will not perform a Cal level self-check at the beginning
of each fastening cycle.
Cal level check while the Cal Check
function is not enabled via the
sequence program.
The Cal level during a sequence-initiated self-check
must be within ± 0.075 VDC (3% of 2.5 VDC) of the
value read from the tool EEPROM.
Cal level check while the Cal Check
function is enabled via the sequence
program. Performed at the beginning of
each fastening cycle.
The Cal level during a PLC-initiated self-check must
be within ± 0.075 VDC (3% of 2.5 VDC) of the value
read from the tool EEPROM.
Cal level check while the PLC Self-
Check input is enabled or the Main Unit
Manual CAL is activated.
The Cal level must be within ± 0.075 VDC (3% of
2.5 VDC) of the value read from the tool EEPROM.
Cal level check at power on.
<CHECK ITEMS>
1. Verify that the tool is properly secured to the mounting plate, and that there are no signs of
stress or misalignment. Ensure that there is no tool movement while the self-check is
being performed.
2. Turn off the power. Verify the homerun cables are in good condition and are properly
connected to the Axis Unit and the tool.
3. Ensure that the Main Unit and Axis Unit are not located near any strong electrical or
magnetic fields.
4. Verify the Axis Unit input voltage and ensure that the power cable is properly connected.
5. Turn on the power. If problem still exists, replace the tool cables with a known good set.
A spare set of cables is normally provided with each System.
6. If problem still exists, replace the affected tool. (Refer to Section 8.3)
7. If problem still exists, replace the affected AXIS UNit. (Refer to Section 8.3)
9.4.3 Offset Check Abnormal (Axis Unit display code "A2")
<ERROR DESCRIPTION>
The Offset (torque level) Check of the tool is outside of the acceptable limits. The following
table details the limits of the check for various equipment conditions.
If the Offset torque check is not sequence-initiated,
the System will not perform an Offset torque check at
the beginning of each fastening cycle.
Offset torque check while the Offset
Check function is not enabled via the
sequence program.
The Offset torque level during a sequence-initiated
self-check must be less than 12% of the full scale
value of the tool.
Offset torque check while the Offset
Check function is enabled via the
sequence program. Performed at the
beginning of each fastening cycle.
The Offset torque level during a PLC initiated self
check must be less than 12% of the full scale value of
the tool.
Offset torque level check while the PLC
Offset Check input is enabled.
<CHECK ITEMS>
Chapter 9: Troubleshooting User Console Version A3.53
Page 9-19