DNH DHVC5000 Series, Use Manual

Page: 43 / 48

40
Ground Fault
Alarm
Software detects ground fault
It is generally caused by input grounding, find
which phase is grounded, and eliminate this
problem
Primary
Overcurrent Alarm
Motor current exceeds the setpoint
and protection time
1. Too high load, reduce the load
2. Check sensor and its wiring
3. Check sensor factor, overcurrent level setting
4. Check the wiring from variable frequency
output to the motor
5. Replace the analog board card, PWM board
card, CPU board card
Secondary
Overcurrent Alarm
Motor current exceeds the setpoint
and protection time
Tertiary
Overcurrent
Fault
Motor current exceeds the setpoint
and protection time
Instantaneous
Overcurrent
Fault
Motor current exceeds the setpoint
and protection time
Motor
Three-Phase
Unbalance
Fault
Motor line is not connected to the
MVC, current sensor is damaged or
output voltage is unbalanced or
other reasons
1. Check sensor and its wiring
2. Check the connecton lines for the motor and
unit stage
3. Check unbalance setting
4. Replace the analog board card, bus board card,
CPU board card
Transformer
Overtemperature
Alarm
Alarm
Transformer iron core temperature
alarm temperature (generally
110
℃
)
1. Check whether the cooling fan works normally
2. Check whether ambient temperature is too high
3 Check whether in overload operating state
4. Check whether temperature parameter setting is
correct or not
Transformer
Overtemperature
Fault
Fault
Transformer iron core temperature
fault temperature (generally 130
℃ )
Screen
Communication
Fault
Fault
Touch screen and CPU
communication failure
1. Check the mobus terminal interface cable;
2. Check whether the connecting line of the RS485
interface is correct, secure;
3. Reset communication board or CPU;
4. Replace the CPU board card.
Contactor Fault Fault
When the contactor is
opened/closed, there is no auxiliary
point feedback signal;
Or the relay (contactor) is damaged,
contactor adhesion occurs
1. Open back cover of the contactor auxiliary
point, check whether auxiliary rod reaches the
designated position after the contactor is closed
2. Replace the contactor
3. Check power module, protector tube,
If there is any damage, replace the component
4. Check DC 220V power supply,
220V protector tube, if there is any damage,
replace the component
Cabinet Top Fan
Fault
Alarm
or
fault
Operating current of the fan in
ventilation system is too high,
thermal relay operates, alarm is
given; if such state lasts
continuously beyond the specified
time, fault alarm will be given 1. Check whether thermal relay setting pointer
knob is above 1.8A, if not, adjust to above 1.8A
2. Check whether protection parameter setting is
correct
3. Check whether cooling fan is blocked or
whether the fan is damaged
Charging could
not meet target
value
Fault
Unit voltage does not reach
charging target value
1. The user connected too low a control power,
standard 380V power supply should be used
2. Power unit is damaged, replace the power unit
3. Charging target value setup error