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Table 3.1.1 Grounding Types
Installation
symbol
Installation construction
class
Main types of equipment
grounded
Remarks
E
A
Class A Under 10
Ω
Lightning rods
E
HT
Class A Under 10
Ω
Special high-voltage frames
Use the shortest possible
lines for the ground trunk
E
N
Class B Under 10
Ω
Transformer midpoints, insect
protection plates
E
LT
Class C Under 10
Ω
Low-voltage equipment
grounding
E
D
Class C Under 10
Ω
Drive units
Use the shortest possible
lines for the ground trunk
E
CG
Class C Under 10
Ω
PLC, control system grounding
3.2 Motor Interface (TMdrive-30)
When connecting to the motor, use a shielded cable and be sure to connect it to the grounding conductor on both
the drive unit side and motor side.
3.2.1 One Motor
Connect the output terminals (U, V, W) of the equipment and motor terminals (R, S, T).
At this time, connect the output terminals of the equipment and motor terminals (U-R, V-S, W-T) as they are,
irrespective of the rotation direction of the motor. The rotation direction of the motor can be set by parameters of
the equipment. Do not change the cable interface to avoid confusions.
3.2.2 Multiple Motors
The sensor-less vector control, option, allows to control the parallel motor connections.
When multiple motors (n units) are connected in parallel, protection circuits are generally provided for each
motor.
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