Mitsubishi FR-A800

Control circuit
INSTALLATION AND WIRING
53
2
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.
2.6.4 Wiring precautions
• It is recommended to use a cable of 0.3 to 0.75 mm
2
for the connection to the control circuit terminals.
• 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, C2) via a relay coil, lamp, etc.
• For the FR-A820-03160(55K) or higher and FR-A840-02160(75K) 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.
+24V
STF, etc
SD
Inverter
External signal input using transistor
(sink logic)
PC
R
STF, etc
+24V
Inverter
External signal input using transistor
(source logic)
Micro signal contacts Twin contacts
Rubber bush
(viewed from inside)
Make cuts along the lines on
the inside with a cutter knife
<Wiring example>