Phone Number : 86-18800548228
WhatsApp : +8618762695734
July 12, 2022
Recently, our customer had a soft start failure problem when using our 1.5t8m knuckle telescopic boom marine crane, Next, OUCO will give you a detailed introduction on how to check and repair the soft starter of knuckle and telescopic boom marine crane.
Why does the screen show “current imbalance”? And how to troubleshoot? Keep Reading:
1. Check the lines
soft starter to the motor lines and input lines, check whether there is a virtual connection or loose;
2.1 Check Motor
remove (dismantle)3 pcs load lines under the soft starter
Turn on the multimeter to beep state; Measure the resistance between each two items, which should be about 0.7
give us the 3 groups of measured data; If the measured data are basically consistent, the motor should be no problems.
Check Input voltage
Use the multimeter to measure whether the input voltage is balanced (each voltage of the three phases at the upper of the soft starter).
2.2 Adjust 3 phase line of soft-start output terminal as follows to test motor and input voltage :
Restore the connection of the upper of the soft starter to its original state, which is yellow, green, and red from left to right;
Connect the yellow cable to the No.2 terminal position at the lower of the soft starter;
-- Connect the green cable to the No.3 terminal position at the lower of the soft starter;
-- Connect the red cable to the No.1 terminal position at the lower of the soft starter;
After this, start the power system for operation, measure & observe the data change of the 3-phase current and give us the data feedback; The value of the three-phase current can be changed at will, but the data should basically be the same, and the error can be less than 5%.(it’s normal)
3. Check marine crane soft starter
No connect with the soft starter, fix the cables(upper of the soft starter) to the cable(lower of the soft starter) at the terminal under the soft starter. Then start the crane to test whether the crane can run normally. If yes, can change the new soft starter, then connect it to test again.
Connect the cable directly(without a soft starter) way:
1)- Connect the cables(upper softer starter) to the cables(below soft starter) and fix it at the terminal below the soft starter. ( yellow-yellow, green - green, red- red cables)
2) Start the breaker and keep the crane boom up to the highest state, measure the current, we will get the data and compare it
if input voltage imbalance problems may need to use another generator to connect with the crane to test again.
1.5t8m knuckle telescopic boom marine crane is our best-selling product. If you have purchased or would like to purchase this crane, you may encounter such problems in its use. Please read on.
The transmitter has been fixed on the boom when the crane leaves the factory.
The receiver is in the electrical control box, and the customer needs to provide a power line from the 24V+ and 24V- positions of the electrical control box to the red and green lines of the receiver.
the Red is 24v + , green is 24v - . correct it to the electric box correctly.
Here is a red button, you should push the button down.
The Oil suction filter is at the inlet of the oil pump (inside the tank)
Oil return filter on top of the oil tank (also inside the oil tank)
Change the oil suction filter needed to drain the oil, and change the oil return filter, do not need to drain the oil.
Oil suction filters are usually replaced monthly.
Oil return filters are usually replaced every 6 months.
Air filters basically do not need to be replaced.
The above is the solution to such problems. If you have any other questions, please ask us immediately, and we will reply to you as soon as possible!