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5) Ensure reasonable acceleration and deceleration time.
◆
The rise is normal, but the overvoltage protection fault occurs.
1) Check if the brake unit is normal;
2) Check if the braking resistor is in good condition;
3) Check that the brake resistor wiring is intact.
Brake unit damage is the cause
◆
1) Check if there is a short circuit in the braking resistor;
2) Check if the brake resistor and brake unit cable are short-circuited or short-circuited to ground;
3) Check if the selection of the braking resistor matches the selection of the brake unit;
4) Measure whether the built-in braking unit is damaged. First, disconnect the power supply, remove
the wiring of the braking resistors B1 and B2, connect the red meter to "B2", and the black meter to
"B1". The pressure difference is about 0.4V.
◆
Tripping occurs when power is applied
1) Check if there is a short circuit in the three-phase input power supply;
2) Check if the rectifier bridge is normal. The measurement method is as follows: first disconnect the
power supply, remove the R, S, T wiring, and set the multimeter to 1 ohm resistor or diode. Use the
black pen of the multimeter to connect to the "+1" terminal of the DC bus. The red pen is connected to
R, S, and T to observe these three values. Then use the multimeter red pen to connect the "—"
terminal, and the black pen is connected to R, S, and T respectively. Observe these three values, the
deviation of these six values can not be too large, and the general value is normal from 0.3 to 0.5V.
A trip occurs at the start-LU-
◆
1) Check whether the three-phase input power is normal, whether the three-phase input voltage is
normal, whether the three-phase input power is balanced, whether there is a virtual connection, etc.
2) Check if the buffer relay of the inverter is normal.
◆ E.FAL module protection appears as soon as it starts up
1) Check if there is a phase-to-phase short circuit between the motor wires;
2) Check if there is a short circuit to the ground in the motor three phases;
3) Check if the insulation level of the motor is normal;
4) Check if the inverter inverter module is normal. The measurement method is as follows: first
disconnect the power supply, remove the U, V, W wiring, and set the multimeter to 1 ohm resistor or
diode. The black pen is connected to "+", the red pen is connected to U, V, W to observe these three
values; the red pen is connected to "-", the black pen is connected to U, V, W to observe these three
values, these 6 numerical deviations can not Too large, the inverter pressure difference of 0.28~0.5V
is normal.
40
high performance crane special inverter User Manual
Chapter 6 Crane specialinverter faults and troubleshooting
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