(a) (b) (c)
19
B. Control signal circuit
1. Separate the power cables of main circuit etc. from the control
cables of the sequence and analog signals by passing the cables
through the different ducts.
2. Use twisted pair shielded wire for control signal and connect the
shield to earth terminal at on end, COMMON terminal of
control board. Leave the other end of shielding open.
3. Avoid common Ground leads between high and low level
voltage equipment.
C. Grounding
1. Be sure ground both the inverter and motor.
2. Keep grounded leads as short as possible.
3. Shield cables used to protect low-level signal leads should
grounded at one end point.
4. Provide class 3 grounding (0.1
Ω or less) for a terminal.
5. When grounding several inverters, make connections as shown
below, no loop is produced as shown in FIG
“a “ , FIG “b“ .
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