VENDOR AIR COMPRESSOR
INSTRUCTION MANUAL
NEX-A SERIES
DONGHWA PNEUTEC CO., LTD.
Introduction
We wish to appreciate you for choosing this DongHwa Pneutec’s NEX-series Compressor
(Oil Injection Screw Compressor).
General
Features :
DongHwa Compressors, Model NEX-series are air-cooled single stage screw compressor
which are mainly used to the service, control and also used for the general purpose such as
pressure test.
Construction :
The compressor consists of the following components: driving unit governed by power supply,
air compressing unit, air-cooling unit to cool the compressed air, air receiver thank to store the
compressed air(Option), and control panel to control the compressor.
For air receiver tank or auxiliary equipment that provided by the user,
be sure to check that they conform to the specifications.
Introduction
General
Index
1. Safety Attention
2. Term and Function of Each Part
3. How to Install
4. How to Operate
5. Check and Maintenance
6. Causes of Troubles and Troubleshooting
7. Machine Long-term Storage
8. Warranty
About the Marks of Warning and Caution
1-1. Notice before Operation
Notice for Installation
1-2. Notice during Operation
1-3. Notice for Maintenance & Check
1-4. Position to stick Warning Label
1-5. Warning Label
Do not touch the electrical equipment and wirings without reasons.
Be sure to disconnect the both of main power supply and operating power
supply during repair and maintenance. Work with the wet hand is
dangerous.
Do not touch the electrical equipment and wirings without reasons.
Be sure to disconnect the both of main power supply and operating power
supply during repair and maintenance. Work with the wet hand is
dangerous.
V-Belt or coupling is rotating at high-speed in the cover. Never put the
hand in the cover. Hand will be entangled.
Disconnect both of main power supply and operating power supply, then
remove the cover when starting the work.
Compressed air or oil spouts when pressure is being applied or when
pressure remains.
When starting work, make sure no pressure is left in the compressor after
it was stopped.
The compressor is hot during operation and immediately after the
stopping.
Do not touch. Work with it after completely cooled.
Term and Function of Each Part
3-1. Confirmation of Product
3-2. Notice for Transportation
(1) Site & Installation
(2) Ventilation
3-2. Notice for Transportation
(3) Space secure for check-out and maintenance
(4) Transportation
3-2. Notice for Transportation
In case transportation using a forklift
Case of transportation hanging by crane
Compressor load and unload
3-3. Notice for Installation
3-3. Notice for Installation
3-3. Notice for Installation
3-4. Notice for Piping
3-4. Notice for Piping
3-4. Notice for Piping
3-4. Notice for Piping
3-4. Notice for Piping
3-5. Notice for Wiring
4-1. Test Run of Compressor
(1) Test run prepare and maintenance
4-1. Test Run of Compressor
Micom Panel can be damage a LCD when it exposure to direct rays of the sun.
In case it can not be quality guaranteed.
4-1. Test Run of Compressor
(2) Test Rum
(3) During Test Run
Setting Discharge Pressure
7.0 bar 8.0 bar 9.0 bar
Loading/Unloading Operation 6~7 bar 7~8 bar 8~9 bar
Operation Temp’ of Cooling Fan STOP : 75 / START : 85
Setting Pressure of Safety Valve 7.5 bar 8.5 bar 9.5 bar
Air High Temp’ Setting Alarm : 100 / Trip : 110
4-1. Test Run of Compressor
(4) Stop
4-2. Daily Operation
4-2-1. Check before operation
(1) Check-out of a compressor oil level gauge
Oil shall be use a NEX Komp’ Oil of Donghwa Pneutic.
(2)
Micom Panel can be damage a LCD when it exposure to direct rays of the sun.
In case it can not be quality guaranteed.
4-2. Daily Operation
4-2-2. Operation
4-2-3. During Operation
Setting Discharge Pressure
7.0 bar 8.0 bar 9.0 bar
Loading/Unloading Operation 6~7 bar 7~8 bar 8~9 bar
Operation Temp’ of Cooling Fan STOP : 75 / START : 85
Setting Pressure of Safety Valve 7.5 bar 8.5 bar 9.5 bar
Air High Temp’ Setting Alarm : 100 / Trip : 110
4-2. Daily Operation
4-2-4. Stop
4-2. Daily Operation
4-2-5. Piping & Instrument Diagram
4-2-6. Sequence Diagram
4-2-7. Capacity Control Block Diagram
4-3. Control System
(1) Compressor air system
(2) Lubricant System
5-1. Periodical Maintenance of Compressor & Notice after
Maintenance
5-1. Periodical Maintenance of Compressor & Notice after
Maintenance
5-2. Daily Check & Operation Record
5-2. Daily Check & Operation Record
(1) Daily operating control
(2) Periodical check-out
(3) Overhaul
5-3. Standards & List for Compressor Maintenance
Compressor Periodical check-out
5-4. Know-how of Check & Maintenance
Motor grease supply
Change of Oil Filter Element
Change of Air Filter Element
Check-out of tube and rubber hose
5-4. Know-how of Check & Maintenance
Cleaning of Oil & Air Cooler
Cleaning of Cooling Fan
Supplement and Change of Oil
5-4. Know-how of Check & Maintenance
Check-out of check valve
Cleaning of Starting Board Panel and Check of Part Fastening
Change of Separator Element
5-4. Know-how of Check & Maintenance
Adjustment and Change of V-belt
Power Transfer Unit (Reference)
NeX-15~45A Belt-Pulley Type
More than NeX-55A Direct Coupling Type
Long Suspension of Operation
5-5. Daily Maintenance Record Sheet
(1) Preparing for long-term storage
(2) Treatment before shutdown
(3) Treatment before re-operation
Warranty
1. Period of Warranty : 1 year after the date of delivery
2. Cases Ruled Out of Guarantee
We do not guarantee secondary compensation such as production cost compensation, sales
compensation, etc. for the disorder or abnormality of this product.
