IAI America S-SEL-E - Manual (Page 262)

Page 257
*Supplement
‚ Another thing to consider with an emergency stop
Usually, the emergency stop input is tied to a ground. In the case where you are using an external power supply, the
power supply voltage can drop, causing an emergency stop to occur. The way the circuitry is designed, the 24V DC
power supply must be turned on before the controller, and the power supply must not be turned OFF while the
controller is in operation.
In addition, if there is a malfunction in the controller causing a part of the unit to break down, the EG condition will
remain in effect and homing cannot be performed. If this happens, please contact IAI.
7 Other Errors
The following errors occur only rarely under normal operating conditions.
Precautions when handling errors/alarms
When you need to turn the power OFF and then ON again, please make sure to wait approximately 15 seconds after
turning the controller power OFF before turning it back ON.
If an error occurs in which you cannot perform homing, please contact a service representative after you have checked
out the condition at the time the error occurred as thoroughly as possible. In some cases, the problem might be in the
program itself and the representative may request a program list from you.
F0 Interrupt error Motor CPU and the interrupt number do not match.
This error could occur when noise interference causes
faulty controller operation or there is a breakdown in
the hardware. Homing is possible after turning the
power OFF and then ON again. If this error occurs
several times, contact IAI.
FF CPU fault error This indicates a fatal error occurred in the main CPU
processing. In this case, the controller will stop
working. You must perform homing after turning the
power OFF and then ON. This alarm will occur if too
many digits were used in a floating point calculation.
Make sure that calculations using a real variable will
produce a value within ±3.4x