User guide


9.4 Axis Unit Abnormal
WARNING:
DO NOT CONNECT OR DISCONNECT CABLES OR OTHER SYSTEM
COMPONENTS WITH POWER APPLIED.
NOTE: Whenever an Abnormal condition occurs related to the Axis Unit, the Axis Unit
Abnormal displays must be checked for any related Axis Unit display codes. Refer to
Section 9.6.1 prior to performing any corrective maintenance.
9.4.1 Zero Check Abnormal ( Axis Unit display code "A1" )
<ERROR DESCRIPTION>
The Zero level of the tool transducer is outside the acceptable limits. The following table
details the limits of the check for various equipment conditions.
If the Zero level check is not sequence-initiated, the
System will still perform a Zero level self-check at the
beginning of each fastening cycle. In this case the
Zero level must be within ± 0.250 VDC of the value
detected during power on of the equipment.
Zero level check while the Zero Check
function is not enabled via the sequence
program. Performed at the beginning of
each fastening cycle.
The Zero level during a sequence-initiated Zero check
must be within ± 0.125 VDC of the value detected
during power on of the equipment.
Zero level check while the Zero Check
function is enabled via the sequence
program. Performed at the beginning of
each fastening cycle.
The Zero level during a PLC-initiated self-check must
be within ± 0.125 VDC of the value detected during
power on of the equipment.
Zero level check while the PLC Self-
Check input is enabled, or the Main Unit
Manual RESET is activated.
Zero level must be between -2 VDC and +2 VDC.
The detected value is loaded into memory for
comparison during other Zero level checks.
Zero 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 (sensor) cable is in good condition and is properly
connected to the Axis Unit and the tool (preamp).
3. Ensure that the Main Unit and the 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 (homerun) 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)
Chapter 9: Troubleshooting User Console Version A3.53
Page 9-18