3.Wiring 3-17
3.6.5 Cable length between inverter and motor
•
If the cable between the inverter and motor is long and the carrier
frequency is high, high-frequency current is leaked from the cable and
peripheral devices. This may damage the inverter and peripheral
devices.
• Adjust the carrier frequency as shown in table below.
• To change the setting related to the carrier frequency, refer to the
parameter setting of C1-01.
Table 3.8 Cable length.vs. carrier frequency
Cable length 30m max. 50m max. 100m max.
More than
100m
Carrier frequency
Less than
10kHz
Less than
8kHz
Less than
4kHz
Less than
1kHz
C1.01 10 8 4 1
3-18 MOSCON-E7 User’s Manual
3.7 Precautions when wiring
3.7.1 Control circuit wiring precautions
•
Separate the control circuit wiring (terminals 1 to 11) from main circuit
wiring (terminals P/B, N, R/L1, S/L2, T/L3, U/T1, V/T2, W/T3, +1,
and +2) and other high-power lines.
• Separate the control circuit terminals A1, B1 and C1 (contact outputs)
from wiring for control circuit terminals (terminals 1 to 11).
• Use twist-pair or shielded twisted-pair to prevent operating faults due
to noise. The maximum cable length is 50cm.
Figure 3.10 Ends of twisted-pair cables
3.7.2 Main circuit input/output wiring
• Do not connect the main circuit power to output terminal U/T1,
V/T2, and W/T3.
• When the output terminals U/T1, V/T2, and W/T3 and motor
terminals U, V, and W are connected, the forward rotation command
causes the motor to rotate counter-clockwise from the view of load
side. To change the direction, switch any of two wires of U, V and W.
Figure 3.11 Direction of motor’s rotation
실드 피부 외피
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