DNH DHVC5000 Series, Use Manual

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42
Settings of the
PWM Board and
CPU Board are
Inconsistent
Fault
The sent value and feedback value
of the CPU and PWM are
inconsistent 1. PWM board is damaged;
2. Back board is damaged;
3. CPU board shuts down or is damaged.
Encoder Signal is
Missing
Alarm
or
Fault
Missing time of encoder signal
exceeds the setpoint, alarm or fault
will be reported
1. Check whether the pulse number is correctly
set;
2. Check whether the encoder signal line is
connected correctly;
3. The 15V encoder is not connected;
4. Replace the digital board or the CPU board;
2. Select a mode with speed encoding, start the VF
or rotate the rotor to observe whether the operating
speed is correct.
Overspeed Fault
Difference in value between the
set motor frequency and the
operating frequency exceeds the set
point
1. PID parameter settings are incorrect;
2. In multimachine drive, the host torque feedback
signal line is loose or not connected to the slave
correctly;
3. The motor rated speed parameter is not set.
Contactor Bypass
Fault
Alarm
or
Fault
Faults or alarms such as bypass
contactor, bypass communication,
qty of bypass exceed the set limit,
bypass enabling is inconsistent with
the wave board, bypass is not ready
etc, are all in this category
1. Check the bypass contactor control line is in
good condition;
2. Check the bypass board;
3. Check the wiring between bypass and the unit;
4. Check bypass settings;
5. Update the wave board and CPU software;
6. Correct the bypass optical fiber.
Control power fault Fault
Send fault when VFD control
power supply is power off, shortage
equal abnormal
1. Check the relay circuit (3015) loop;
2. Check control electric power supply circuit;
4.4 User Side Faults
4.4.1 User Power Supply Problems
 User voltage or input line voltage is too low.
 When high power charging mode is adopted, the user’s low voltage is inconsistent
with the medium voltage phase sequence.
4.4.2 Incorrect Operation By The User
 User does not use the MVC according to appropriate operating instructions.
 Brake ON and other conditions that prevent the variable frequency start of the
motor or increase the variable frequency load and are not present during a normal
start operation.
4.4.3 User Environmental Factors
 The user has a high temperature or unventilated installation site which can lead to
over-temperature of the variable frequency transformer or power unit.

The users site has powerful electromagnetic interference which can effect and even