Mitsubishi Electric 800 Series Instruction Manual page 52

Signal inputs by contactless switches
The contact input terminals of the inverter (STF, STR, STP (STOP), RH, RM, RL, JOG, RT, MRS, RES, AU and CS) can be
controlled using a transistor instead of a contact switch as shown below.
External signal input using transistor
(sink logic)
2.6.4
Wiring precautions
• It is recommended to use a cable of 0.3 to 0.75 mm
• The wiring length should be 30 m (200 m for the terminal FM) at the maximum.
• Use two or more parallel micro-signal contacts or twin contacts to prevent contact
faults when using contact inputs since the control circuit input signals are micro-
currents.
• To suppress EMI, use shielded or twisted cables for the control circuit terminals
and run them away from the main and power circuits (including the 200 V relay
sequence circuit). For the cables connected to the control circuit terminals, connect their shields to the common terminal of
the connected control circuit terminal. When connecting an external power supply to the terminal PC, however, connect the
shield of the power supply cable to the negative side of the external power supply. Do not directly earth (ground) the shield
to the enclosure, etc.
• Always apply a voltage to the fault output terminals (A1, B1, C1, A2, B2, and C2) via a relay coil, lamp, etc.
• For the FR-A860-01440 or higher, separate the wiring of the control circuit away from the wiring of the main circuit.
Make cuts in rubber bush of the inverter side and lead the wires through.
Rubber bush
(viewed from inside)
Make cuts along the lines on
the inside with a cutter knife
+24 V
STF, etc.
Inverter
SD
2
for the connection to the control circuit terminals.
Inverter
PC
STF, etc.
External signal input using transistor
(source logic)
Micro signal contacts
<Wiring example>
INSTALLATION AND WIRING
Control circuit
+24 V
R
Twin contacts
51
2