MITSUBISHI ELECTRIC MR-J2S- A - Manual (Page 109)

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3. SIGNALS AND WIRING
(2) Termination of the cables
(a) When the wire is inserted directly
Insert the wire to the end pressing the button with a small flat blade screwdriver or the like.
Button
Small flat blade
screwdriver or the like
Twisted wire
When removing the short-circuit bar
from across P-D, press the buttons
of P and D alternately pulling the
short-circuit bar. For the installation,
insert the bar straight to the end.
(b) When the wires are put together using a bar terminal
Insert a bar terminal with the odd-shaped side of the pressured terminal on the button side.
Bar terminal for one
wire or solid wire
Bar terminal for two wires
When the two wires are inserted into one opening, a bar terminal for two wires is required.