Inovance MD500-PLUS Series - Page 168

Troubleshooting for Common EMC Interference Problems
‑167‑
Table 9–1 Troubleshooting for leakage current
Symptom
Possible Cause Action
Trip upon
power‑on
The anti‑interference
performance of the earth
leakage circuit breaker is
poor.
1. Use an earth leakage circuit breaker
from a recommended manufacturer.
2. Use an earth leakage circuit breaker
with greater operating current.
3. Move the unbalanced load to the front
end of the earth leakage circuit
breaker.
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 operating current of
the earth leakage circuit
breaker is too low.
Unbalanced load is
connected to the back end
of the earth leakage circuit
breaker.
The capacitance to the
ground at the front end of
the AC drive is large.
Trip during
operation
The anti‑interference
performance of the earth
leakage circuit breaker is
poor.
1. Use an earth leakage circuit breaker
from a recommended manufacturer.
2. For an individual AC drive, tighten the
EMC screw. For multiple AD drives,
disconnect the optional EMC grounding
screw, as shown in "
Figure 9–1
Disconnecting the optional EMC
grounding screw
" on page 168 .
3. Install a simple filter on the input side
of the AC drive, and wind the LN/RST
cable on a magnetic ring near the earth
leakage circuit breaker, as shown in
"
Figure 9–2 Installing a simple filter and
magnetic ring on the input side
" on
page 168
.
4. Use an earth leakage circuit breaker
with greater rated operating current.
5. Reduce the carrier frequency while
ensuring performance.
6. Use shorter motor cables.
The operating current of
the earth leakage circuit
breaker is too low.
Unbalanced load is
connected to the back end
of the earth leakage circuit
breaker.
The distributed
capacitance to the ground
of the motor cables and
motors is large.