Cautions For Switching J4 Mode/J3 Compatibility Mode; Cautions For The J3 Compatibility Mode - Mitsubishi Electric MELSERVO-J3 Series Handbook

Part 6: Common Reference Material

6.1.7 Cautions for switching J4 mode/J3 compatibility mode

The J3 compatibility mode of the operation mode is automatically identified by factory setting depending on a
connected encoder. If a proper encoder is not connected at the first connection, the system will not start
normally due to a mismatch with a set mode with the controller. (For the J4 mode, you can set the operation
mode with [Pr. PA01].) When the operation mode mismatches, the servo amplifier will display [AL. 3E.1
Operation mode error]. Set the mode back to the factory setting or set correctly (J4 mode/J3 compatibility
mode and operation mode) using the application "MR-J4(W)-B mode selection".

6.1.8 Cautions for the J3 compatibility mode

The J3 compatibility mode is partly changed and has restrictions compared with MR-J3 series.
(1) The alarm display was changed from 2 digits (_ _) to 3 digits (_ _. _). The alarm detail number (._) is
displayed in addition to the alarm No (_ _). The alarm No. (_ _) is not changed.
(2) When the power of the servo amplifier is cut or fiber-optic cable is disconnected, the same type
communication can be cut regardless of connection order. When you power on/off the servo amplifier
during operation, use the connect/disconnect function of the controller. Refer to the following manuals
for detail.
・MELSEC iQ-R Motion Controller Programming Manual (Common) (R16MTCPU/R32MTCPU) (IB-
0300237) "5.3.1 Connect/disconnect function of SSCNET communication"
・Motion controller Q series Programming Manual (COMMON) (Q173D(S)CPU/Q172D(S)CPU) (IB-
0300134) "4.11.1 Connect/disconnect function of SSCNET communication"
・MELSEC iQ-R Simple Motion Module User's Manual (Application)
(RD77MS2/RD77MS4/RD77MS8/RD77MS16) (IB-0300247) "8.12 Connect/Disconnect Function of
SSCNET Communication"
・MELSEC-Q QD77MS Simple Motion Module User's Manual (IB-0300185) "14.12 Connect/disconnect
function of SSCNET communication"
・MELSEC-L LD77MH Simple Motion Module User's Manual (IB-0300172) "14.13 Connect/disconnect
function of SSCNET communication"
・MELSEC-L LD77MS Simple Motion Module User's Manual (Positioning Control) (IB-0300211) "14.13
Connect/disconnect function of SSCNET communication"
(3) The J3 compatibility mode has a functional compatibility. However, the operation timing may differ.
Check the operation timing on customer side to use.
(4) The J3 compatibility mode is not compatible with high-response control set by [Pr. PA01 Operation
mode].
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