Mitsubishi Electric MELSERVO-J4 Instruction Manual page 77

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 70 Name: Load-side encoder initial communication error 1
Alarm content
Detail
Detail name
No.
70.3 Load-side (1) An axis not used is not
encoder initial
communication
- Receive data
error 3
(2) The load-side encoder
(3) A load-side encoder
(4) The power voltage has
(5) The parameter setting
(6) When you use an A/B/Z-
(7) When you use a four-
(8) The servo amplifier is
(9) A load-side encoder is
(10) Something near the
An error occurred in the communication between the load-side encoder and servo amplifier.
Cause
Check the setting of
set as disabled-axis. the disabling control
axis switches (SW2-
2/SW2-3/SW2-4).
Check if the load-side
cable was encoder cable is
disconnected. connected correctly.
Check if the load-side
cable is malfunctioning. encoder cable is
disconnected or
shorted.
Check the power
been unstable. (For the capacity and voltage.
load-side encoder with
the external power
supply input)
Check the parameter
of communication setting.
method is incorrect.
[A]: [Pr. PC44]
[B] [GF]: [Pr. PC26]
Check if the wiring of
phase differential output the linear encoder is
linear encoder, the correct. (Check if it is
connection with the wired to PSEL.)
linear encoder is
incorrect.
Check if the servo
wire type linear encoder, amplifier is compatible
the servo amplifier is not with the four-wire type
compatible with the four- linear encoder. (MR-
wire type linear encoder. J4-_-RJ)
Replace the servo
malfunctioning. amplifier, and then
check the
repeatability.
Replace the load-side
malfunctioning. encoder, and then
check the
repeatability.
Check the noise,
device caused it. ambient temperature,
vibration, etc.
Check method Check result
It is not set as
disabled-axis.
It is set as disabled-
axis.
It is not connected.
It is connected.
It has a failure.
It has no failure.
It has a failure.
It has no failure.
The setting is
incorrect.
The setting is
correct.
The wiring is
incorrect.
The wiring is correct. Check (7).
It is not compatible.
It is compatible.
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
It has a failure.
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Action Target
Set it as disabled- [WB]
axis.
Check (2).
Connect it correctly. [A]
[B]
Check (3).
[WB]
[GF]
Replace or repair
the cable.
Check (4).
Review the power
and related parts.
Check (5).
Set it correctly. [A]
[B]
[GF]
Check (6).
Wire it correctly.
Use a servo
amplifier which is
compatible with it.
Check (8).
Replace the servo [A]
amplifier. [B]
[WB]
Check (9).
[GF]
Replace the load-
side encoder.
Check (10).
Take
countermeasures
against its cause.