Mitsubishi Electric C70 Connection Manual page 9

(2) Items related to wiring
Correctly wire this product. Failure to observe this could result in servomotor runaway, etc.
Do not install a phase advancing capacitor, surge absorber or radio noise filter on the output side of the servo
drive unit.
Correctly connect the output side (terminal U, V, W). The servomotor will not run properly if incorrectly
connected.
Always install an AC reactor per each power supply unit.
Always install an appropriate breaker per each power supply unit. A breaker cannot be shared for multiple power
supply units.
Do not directly connect a commercial power supply to the servomotor. Failure to observe this could result in
faults.
When using an inductive load such as relays, always connect a diode in parallel to the load as a noise
countermeasure.
When using a capacitive load such as a lamp, always connect a protective resistor in series to the load to
suppress rush currents.
Do not mistake the direction of the surge absorption diode to be installed on the DC relay for the control output
signal. If mistaken, the signal will not be output due to fault in the drive unit, and consequently the protective
circuit, such as emergency stop, could be disabled.
Servo drive unit
COM
(24VDC)
Control
output
signal
Do not connect or disconnect the connection cables between each unit while the power is ON.
Do not connect or disconnect the PCBs while the power is ON.
Do not pull the cables when connecting/disconnecting it.
Securely tighten the cable connector fixing screw or fixing mechanism. Insufficient fixing could result in
dislocation during operation.
Always treat the shield cables indicated in the Connection Manual with grounding measures such as cable
clamps.
Separate the signal wire from the drive line or power line when wiring.
Carry out wiring so that there is no possibility of short circuit between wires, nor of dangerous state.
Servo drive unit
COM
(24VDC)
Control
output
RA
signal
CAUTION
RA