Mitsubishi Electric FR-F862 Instruction Manual page 41

Control circuit
Signal inputs by contactless switches
The contact input terminals of the inverter (STF, STR, STP (STOP), RH, RM, RL, JOG, RT, MRS, RES, AU, CS) can be
controlled using a transistor instead of a contact switch as shown below.
External signal input using transistor
(sink logic)
2.6.5
Wiring precautions
• It is recommended to use a cable of 0.75 mm
• The wiring length should be 30 m 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
200V 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, C2) via a relay coil, lamp, etc.
• 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)
40
INSTALLATION AND WIRING
+24 V
STF, etc.
Inverter
SD
2
for the connection to the control circuit terminals.
Make cuts along the lines on
the inside with a cutter knife
Inverter
PC
STF, etc.
External signal input using transistor
(source logic)
Micro signal contacts
<Wiring example>
+24 V
R
Twin contacts