Ground Wiring - Omron SYSDRIVE 3G3JV User Manual

Design
Also, adjust the carrier frequency (set in n46) according to the cable length between the Inverter and the
motor, as shown in the following table.
Cable length
Carrier frequency
Note Single-phase motors cannot be used.
The Inverter is not suited for the variable speed control of single-phase motors.
The rotation direction of a single-phase motor is determined by the capacitor starting method or
phase-splitting starting method to be applied when starting the motor.
In the capacitor starting method, however, the capacitor may be damaged by a sudden electric
discharge of the capacitor caused by the output of the Inverter. On the other hand, the starting coil
may burn in the phase-splitting starting method because the centrifugal switch does not operate.
H Ground Wiring
• Always use the ground terminal with the following ground resistance:
200-V Inverter: 100 Ω or less
400-V Inverter: separate ground,10 Ω or less
• Do not share the ground wire with other devices such as welding machines or power tools.
• Always use a ground wire that complies with technical standards on electrical equipment and mini-
mize the length of the ground wire.
Leakage current flows through the Inverter. Therefore, if the distance between the ground electrode
and the ground terminal is too long, the potential on the ground terminal of the Inverter will become
unstable.
50 m or less
10 kHz max.
100 m or less
5 kHz max.
Chapter 2
More than 100 m
2.5 kHz
2-21