49
PRECISION MACHINE TOOLS Ver 2 Maintenance Manual
Condition Cause Remedy
Power lamp
is off
1. LED burnt
2. PC board fuse blown
3. Transformer burnt
4. Wire 18,19 loose connection
1. Replace PC board
2. Replace fuse
3. Replace transformer
4. Reconnect wire 18,19
REV is lighted
1. 3 phase power reverse value 3 phase
is above ±10%
2. Pressure reduction and differential
1. Switch any 2 of the R.S.T wires
2. Stability power source
OPS is lighted
1. Inlet oil pipe is clogged or loosened
2. Inlet & outlet are reversed
3. Pump motor runs reverse
4. Pump can not run
5. Circulation oil is not enough
6. Oil filter is dirty
7. Oil pressure switch breakdown
1. Check, clean and lock pipe
2. Correct position of in/outlet
3. Check over-relay of 51p red
and white lines.
4. Replace oil pump
5. Supply circulation oil
6. Replace new filter
7. Adjust oil pressure switch DIFF,
0.3 kgf/cm² range 0.8~0.8 cmHg
PUMP is lighted
1. Overload relay is off
2. Pump switch is off
3. Inlet pipe is clogged
1. Reset switch
2. Reset pump switch
Clean pipe and replace oil filter
COM is lighted
1. Overload relay off
2. Compressor breakdown
1. Reset switch
2. Replace compressor
HP is lighted
1. Condenser is too dirty
2. Air filter is not clean
3. Cooling fan doesn’t run or blades fall.
4. Cooling medium pressure switch
breakdown.
5. Cooling medium is leaking
1. Use compress air to clean fins
and restart cooler.
2. Clean filter.
3. Lock fan blades tightly or replace
fan motor.
4. Replace cooling medium
pressure switch.
5. Irrigate cooling medium.
RA is lighted 1. Room temp. sensor breakdown 1. Replace RA sensor
RO is lighted 1. Oil temp. sensor breakdown 1. Replace RO sensor
OT is lighted
1. Oil temp. is to high
2. Temp. sensor blown
3. Check cooling medium is enough or not.
1. Stop running cooler until oil temp.
returns to normal range start again
2. Replace temp sensor.
3. Supply cooling.
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