Safety Precautions - Mitsubishi Electric MELSERVO-J4 Instruction Manual

6. HOW TO USE INDEXER

6.4.5 Safety precautions

(1) I/O signal
(a) When a home position return is not executed in the absolute position detection system and
incremental system...
The station output signals will not be outputted (all off).
(b) When one or more home position returns is completed...
1) At power-on and forced stop, corresponding station output signal will be outputted if only it is
within the in-position range of each next station position.
2) After power-on or during servo motor driving after forced stop, PS0 (Station output 1) to PS7
(Station output 8) will be off without change with a command travel distance other than "0" even if
it is within the in-position range of target next station.
3) After power-on or after servo motor driving after forced stop canceled, corresponding station
output signal will be outputted if only it is within the in-position range of target next station to stop
with the rest of command travel distance "0".
(2) Torque limit
The torque limit will change from the setting value of [Pr. PC35 Internal torque limit 2] to the setting value
of [Pr. PA11 Forward rotation torque limit] or [Pr. PA12 Reverse rotation torque limit] at inputting ST1
(Forward rotation start) of the automatic operation mode 1, automatic operation mode 2, manual
operation, and torque limit changing dog type home position return. Additionally, after positioning
completed signal is outputted, the time has passed set with [Pr. PT39] and the torque limit will change
from [Pr. PA11 Forward rotation torque limit] or [Pr. PA12 Reverse rotation torque limit] to the setting
value of [Pr. PC35 Internal torque limit 2].
(3) Test operation
Always turn off the power after the JOG test operation, positioning test operation, and machine analyzer
function operation. The shaft cannot stop at the next station position because the coordinate system has
a gap for the shaft control.
(4) Deceleration to a stop function
When the operation is stopped with the deceleration to a stop function during each operation mode of
the rotation direction specifying indexer, shortest rotating indexer, and station JOG, the shaft will stop
regardless of the station position.
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