Panasonic MINAS A6 Multi Series Technical Reference page 201

7.2Details of protective function
Error No.
Protective function
Main Sub
55 0 A-phase connection error
protection
1 B-phase connection error
protection
2 Z-phase connection error
protection
(To be continued)
7-17
Causes
In the driver module, A-phase connection in
2nd encoder for each axis (A/B/Z external
scale) is defective, e.g. discontinued.
In the driver module, B-phase connection in
2nd encoder for each axis (A/B/Z external
scale) is defective, e.g. discontinued.
In the driver module, Z-phase connection in
2nd encoder for each axis (A/B/Z external
scale) is defective, e.g. discontinued.
Measures
 In the driver module, check the A-phase
connection of 2nd encoder for each axis
(A/B/Z external scale).
 Replace the external scale.
 In the driver module, check the B-phase
connection of 2nd encoder for each axis
(A/B/Z external scale).
 Replace the external scale.
 In the driver module, check the Z-phase
connection of 2nd encoder for each axis
(A/B/Z external scale).
 Replace the external scale.