IAI America RCP2-CF - Manual (Page 153)

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10.6 Specific Problems
 I/O signals cannot be exchanged with the PLC.
Cause: [1] The 24-V I/O power supply is connected in reverse.
(This will not affect the input circuits, but the output circuits will be damaged.)
[2] If the problem is with an output circuit, a circuit component may have been damaged due to a
large load that caused the current flowing into the circuit to exceed the maximum current.
[3] Contact failure in the connector or relay terminal block on the PLC end.
[4] Contact failure between the female pins in the flat cable connector and the male pins on the
controller due to expanded female pins.
Action: Check the connection condition of the power supply and connector, as well as the load on the output
side.
If the cause is identified as [1] or [2], the controller must be replaced. If there is a possibility of [4], the
flat cable must be replaced. Please contact IAI.
Note: When performing a continuity check of the flat cable, pay due attention not to expand the female
pins in the connector. It may cause contact failure and disable normal operation of the controller.
 The RDY lamp does not illuminate after the power is input.
Cause: [1] Reverse connection of the 24-V power supply
[2]
Faulty controller
If the power supply is connected properly, probably the controller is faulty. Please contact IAI.
(Note) If the 24-V power supply is connected in reverse, the controller may not fail immediately but
its service life will likely be shortened.
 Only the RDY lamp illuminates when the servo ON signal is input after the power was input.
(The servo does not turn ON.)
Cause: [1] Contact failure of the flat cable
[2]
Faulty controller
Check the servo ON signal (SON) on the I/O monitor screen of the PC or teaching pendant.
If the signal is input, probably the controller is faulty. Please contact IAI.
 Both the RDY lamp and ALM lamp illuminate when the power is input.
(An alarm is present, or an emergency stop has been actuated or the motor power is cut off.)
Check which of the alarm signal (*ALM) and emergency-stop signal (*EMGS) is output on the I/O monitor
screen of the PC or teaching pendant.
If the alarm signal is output, check the description of the error and remove the cause.
If the emergency-stop signal is output, check the following items:
[1] Is the emergency-stop switch on the operation panel pressed? Also confirm that the necessary interlocks
are released.
[2] Is the emergency-stop switch on the teaching pendant pressed?
[3] Is the PORT switch turned ON when neither teaching pendant nor PC is connected?
[4] If multiple controllers are connected, are the crossover wires connected correctly?
If the controller is of the external cutoff relay type, check the safety circuit.