Alarm 350 Reference Position Alarm

8. TROUBLESHOOTING

B–62755EN/01

8.15
ALARM 350 (SERIAL
PULSE CODER IS
ABNORMAL)

An error is generated in the control section of the serial pulse coder.

Points

1. Alarm No. 351 has also generated ⇒ Refer to alarm 351.
2. Only alarm No. 350 has generated ⇒ Refer to the following. Confirm the details by diagnostic number 0202 and 0204.

When diagnostic number 0202 shows 1

#6(CSA) Check sum alarm has generated.

#4(PHA) Phase data abnormal alarm has generated.
#3(RCA) Speed count abnormal alarm has generated.
#1(CKA) Clock alarm has generated.

#0(SPH) Soft phase data abnormal alarm has generated.

1. Check the contents using the above diagnostic function if the alarm generates repeatedly. If diagnostic data is the same, serial pulse coder may be faulty.⇒ Refer to Notes
2. When diagnostic result is not the same, or other abnormality is detected, an external noise may be generated.

When diagnostic number 0204 shows 1

#4(LDA) LED of serial pulse coder is abnormal.

#3(PMS) Pulses are not issued correctly by abnormality of serial pulse coder C or feedback cable.

(1) #4(LDA): LED in the serial pulse coder is abnormal.

Serial pulse coder is faulty ⇒ Refer to Notes
(2) #3(PMS): Pulses are not issued correctly by abnormality of feedback cable.

1. Fault of serial pulse coder ⇒ Refer to Notes
2. Feedback cable is faulty.

Content Credit: FANUC Product Manual