Wire The Inverter Output To Motor; Ground Terminal; Logic Control Wiring - Omron MX2 User Manual

Step-by-Step Basic Installation

2-3-12 Wire the Inverter Output to Motor

Step 4

2-3-13 Ground Terminal

2-3-14 Logic Control Wiring

The process of motor selection is beyond the scope of this manual. However,
it must be an AC induction motor with three phases. It should also come with a
chassis ground lug. If the motor does not have three power input leads, stop
the installation and verify the motor type. Other guidelines for wiring the motor
include:
• Use an inverter-grade motor for maximum motor life (1600 V insulation).
• For standard motors, use the AC reactor accessory if the wiring between
the inverter and motor exceeds 10 meters in length.
Simply connect the motor to the terminals [U/T1], [V/T2], and [W/T3] as
shown in page 38 to page 41. This is a good time to connect the chassis
ground lug on the drive as well. The motor chassis ground must also connect
to the same point. Use a star ground (single-point) arrangement, and never
daisy-chain the grounds (point-to-point).
• Check the mechanical integrity of each wire crimp and terminal connec-
tion.
• Replace the housing partition that covers access to the power connec-
tions.
Special care to be taken when motor is connected through long wires
To prevent electric shock, be sure to ground the Inverter and the motor.
The 200 V class should be connected to the ground terminal under Class D
grounding conditions (conventional Class 3 grounding conditions: 100 Ω or
less ground resistance), The 400 V class should be connected to the ground
terminal under Class C grounding conditions (conventional special Class 3
grounding conditions: 10 Ω or less ground resistance).
For the ground cable, use the compatible cable or a cable with a larger diame-
ter. Make the cable length as short as possible.
When several Inverters are connected, the ground cable must not be con-
nected across several Inverters, and must not be looped. Otherwise, the
Inverter and surrounding control machines may malfunction.
After completing the initial installation and powerup test in this chapter, you
may need to wire the logic signal connector for your application. For new
inverter users/applications, we highly recommend that you first complete the
powerup test in this chapter without adding any logic control wiring. As a quick
reference here is included the control connection diagram. But for more
details about inputs and outputs configuration, please check SECTION 4
Operations and Monitoring.
Section 2-3
43