Solutions To Common EMC Problems
‑192‑
10 Solutions To Common EMC Problems
10.1 Residual Current Device Malfunction
When the residual current device (RCD) malfunctions, perform troubleshooting
according to the following table.
Table 10–1 Troubleshooting for leakage current
Trip
Possible Cause Solution
Trip upon
power‑on
The anti‑interference
performance of the RCD is
poor.
1. Use a RCD from a recommended
manufacturer.
2. Replace with a RCD with a higher rated
tripping current.
3. Move the unbalanced load to the front
end of the RCD.
4. Remove the EMC screw or disconnect
the grounding terminal of the external
EMC filter to reduce the capacitance of
the input end to the ground.
The action current of the
RCD is too low.
Unbalanced load is
connected to the back end
of the RCD.
The capacitance to the
ground at the front end of
the AC drive is large.
Trip during
operation
The anti‑interference
performance of the RCD is
poor.
1. Use a RCD from a recommended
manufacturer.
2. For an individual AC drive, tighten the
EMC screw. For multiple AC drives,
disconnect the optional EMC grounding
screw, as shown in "
Figure 10–1
Disconnecting the optional EMC
grounding screw
"
on page 193
.
3. Install a simple filter on the input side
of the drive, and wind the LN/RST
cables through a magnetic ring near
the RCD, as shown in "
Figure 10–2
Installing simple filter and magnetic
ring on the input side
"
on page 193
.
4. Replace with a RCD with a higher rated
tripping current.
5. Reduce the carrier frequency while
ensuring performance.
6. Use shorter motor cables.
The action current of the
RCD is too low.
Unbalanced load is
connected to the back end
of the RCD.
For motor cables and the
motor, the distributed
capacitance to ground is
too high.
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