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Common Machine Malfunctions and Solutions
Warning
：
Machine maintenance and repair must be carried out by
qualified technicians. The operating voltage in the machine can be up to
600V and it is important that power be cut at the machine and at the control
box before covers are removed and repairs carried out. A cooling-down
period of at least 5 minutes is required before commencement of any
inspection and repairs. This will allow the capacitor to fully discharge.
1. Inspection Before Overhaul
1.1. Check if the line voltage on the three-phase power supply is within the range
of 340V - 420V and, that all phases on a three-phase system are intact.
1.2. Check if the power cable as well as the earth wire is firmly connected.
1.3. Check whether the wiring connections are correct and firmly connected.
2. Common Machine Problems and Troubleshooting
No.
Problem
Root Cause
What to do
1
Machine is
switched on, no
digital display,
fan not
operational, no
open-circuit
voltage.
Power switch malfunction
or damaged.
Repair or replace switch.
Power phase down.
Check power supply
phases and rectify.
No power supply from the
grid.
Check the power grid.
Filter capacitor and/or
rectifier bridge damaged.
Replace filter capacitor
and/or rectifier bridge.
Transformer damaged.
Replace the transformer.
Control board damaged.
Replace the control board.
