Troubleshooting
‑36‑
6 Troubleshooting
6.1 Troubleshooting
The following table describes the faults that may occur during the usage of the
MD500‑EM1 card and AC drive.
Table 6–1 Fault causes and solutions
Symptom
Possible Causes Solution
Communication failure
between the MD500‑EM1
card and the AC drive
1. The AC drive does not
support Modbus
communication.
2. The communication
configuration of the MD500‑
EM1 card is incorrect.
3. The MD500‑EM1 card
encountered a hardware
failure.
1. Check that the AC drive
supports Modbus
communication.
2. Correctly configure the
communication parameters
of the MD500‑EM1 card.
3. Replace the MD500‑EM1
card.
Err164 communication error
reported by the MD520
series AC drives during
running
Err16 communication error
reported by the MD500‑PLUS
series AC drives during
running
1. The communication data
is abnormal.
2. The network cable is
damaged or connected
incorrectly.
3. The AC drive suffers
external interference.
1. Check that the program of
the Modbus‑TCP master is
normal.
2. Check whether the
network cable is connected
correctly. Replace the
network cable if required.
3. Use the Cat5e shielded
twisted pair (STP) network
cable as required. Check
that MD500‑EM1 card is
grounded correctly.
Eliminate the external
interference. Contact the
agent or Inovance for
technical support if
necessary.
To obtain the fault code, read DF‑58 of the AC drive. The following table describes the
faults and solutions.
Note that one fault code indicates one fault.
Fault Code
Description
Solution
0
/ /
81 Communication timeout
Check that the connecting is
correct and the master runs
normally.
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